Fuel and Emissions Systems Symptom Troubleshooting - Engine will not start, engine starts but stalls immediately, or engine is hard to start
Engine will not start, engine starts but stalls immediately, or engine is hard to start
Special Tools Required
Vacuum Pump/Gauge, 0?30 inHg Snap-on YA4000A or equivalent, commercially available
NOTE:
Before beginning this troubleshooting, do a customer diagnostic interview.
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When the symptom cannot be duplicated, you can do the troubleshooting using the on-board snapshot information in this procedure. Refer to the diagnostic interview (date, place) and the present total mileage, and compare the total mileage which is estimated from the interview when a failure occured and the parameter (total mileage) in the on-board snapshot information. Make sure the date when the failure occured corresponds with the date on which the on-board snapshot information was recorded. If it doesn't, the on-board snapshot information cannot be used in this troubleshooting.
Before beginning this troubleshooting:
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Make sure the battery is fully charged.
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Make sure the fuel tank is at least 1/4 full.
?
Make sure the engine oil level is correct.
After the troubleshooting, reset the PCM with the HDS to erase the on-board snapshot information recorded on the PCM.
1.
DTC check:

DTC check
?1.
Turn the vehicle to the ON mode.

?2.
Check for Pending or Confirmed DTCs with the HDS.
DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
       

Are any Pending or Confirmed DTCs indicated?

     
YES
     
     
     
Go to the indicated DTC's troubleshooting.?
     
NO
     
     
     
Go to step 2.
NOTE: If the HDS does not communicate with the vehicle, go to the PCM power and ground circuit troubleshooting.
2.
Immobilizer system check:

Immobilizer system check
?1.
Check the immobilizer status log.

NOTE: When a status log count is found, it means the immobilizer system has kept the engine from starting in the past. The number of status log count shows how often the system has kept the engine from starting in the past. If the immobilizer system has no status log count, the system is normal.

Were any status log counts found?

     
YES
     
     
     
Check for probable cause of the status log.?
     
NO
     
     
     
Go to step 3.
3.
Problem verification (snapshot sampling):

Problem verification (snapshot sampling)
?1.
Set the HDS to record a HIGH-SPEED SNAPSHOT of following parameters for 30 seconds.
IMMOBILIZER
ENGINE SPEED
BATTERY
ECT SENSOR 1
MAP SENSOR
MAF SENSOR
FUEL PRESSURE CONVERTED FROM PF SENSOR
FUEL PRESSURE DIRECT INJECTION SYSTEM
CMP B NO PULSE
CMP B NOISE
CKP NO PULSE
CKP NOISE
EGR valve position sensor (EGR VLS)
VTEC PRES SW

?2.
Begin the snapshot, then try to start the engine.

Is the engine hard to start?

     
YES
     
     
     
Go to step 6 (diagnosis by parameter troubleshooting).
     
NO
     
     
     
Go to step 4.
4.
On-board snapshot check (Engine will not start):

On-board snapshot check (Engine will not start)
?1.
Check the record of Hard to Start Engine in the on-board snapshot with the HDS.


Is the Hard to Start Engine in the on-board snapshot recorded?

     
YES
     
     
     
Go to step 6 (diagnosis by parameter troubleshooting).
     
NO
     
     
     
Go to step 5.
5.
On-board snapshot check (Engine Stall 2):

On-board snapshot check (Engine Stall 2)
NOTE: If a Hard to Start on-board snapshot data was not recorded, use the Engine Stall 2 on-board snapshot data and check the cause of the failure.

?1.
Check for a record of Engine Stall 2 in the on-board snapshot with the HDS.


Is an Engine Stall 2 on-board snapshot recorded?

     
YES
     
     
     
Go to step 21 (diagnosis by parameter AF FB (ST FUEL TRIM)).
     
NO
     
     
     
Go to step 23 (fuel system troubleshooting).
NOTE: In case of the following conditions, the on-board snapshot cannot be recorded when the engine stalls.
The ignition switch is turned to LOCK (0) or the engine start/stop button is pressed to select the OFF mode, after starting the engine.
Vehicle condition not in the on-board snapshot recoding zone of Hard to start engine (see the gray zone of following graph).
Low or dead 12 volt battery
Replacing the 12 volt battery

ECT SENSOR 1 (°F (°C ))
-40
(-40)
-22
(-30)
-13
(-25)
-4
(-20)
5
(-15)
14
(-10)
194
(90)
Start time (sec)
6.0
6.0
3.0
2.3
1.5
1.5
1.5

6.
On-board snapshot or snapshot check (IMMOBILIZER):

On-board snapshot or snapshot check (IMMOBILIZER)
NOTE: Use the on-board snapshot in the case of an intermittent failure, or use the snapshot in the case of a reproducible failure.

?1.
Select the Hard to Start Engine in the on-board snapshot or snapshot with the HDS.


?2.
Select the IMMOBILIZER and ENGINE SPEED in the configuration list.
Compare the snapshot parameters observed while the engine was cranking, to those in the chart below, to determine the problem.

Pattern
Symptom (Diagnosis by parameter)
Additional remarks
Pattern 1
IMMOBILIZER inhibit

IMMOBILIZER inhibit
When IMMOBILIZER indicates “BAN” during cranking or after start, the fuel pump is stopped by IMMOBILIZER inhibit.
No failure in the engine
Pattern 2
IMMOBILIZER permit Normal

IMMOBILIZER permit Normal

IMMOBILIZER is normal when IMMOBILIZER indicates “RUN” when cranking or after start.

Which pattern is indicated?

     
Pattern 1
     
     
     
The immobilizer system has a failure. Go to the immobilizer System Check.?
     
Pattern 2
     
     
     
The immobilizer system is OK. Go to step 7 (diagnosis by parameter (ENGINE SPEED)).
7.
On-board snapshot or snapshot check (ENGINE SPEED):

On-board snapshot or snapshot check (ENGINE SPEED)
NOTE: Use the on-board snapshot in the case of an intermittent failure, or use the snapshot in the case of a reproducible failure.

?1.
Select the Hard to Start Engine in the on-board snapshot or snapshot with the HDS.


?2.
Select the ENGINE SPEED pattern chart in the configuration list.
Check the recorded snapshot parameters while the engine is cranking, then compare the pattern from the chart, and determine the problem.

Pattern
Symptom (Diagnosis by parameter)
Additional remarks
Pattern 1
ENGINE SPEED when cranking is normal

  
Pattern 2
ENGINE SPEED when cranking is low
When ENGINE SPEED during cranking is low, weak 12 volt battery or increased engine friction can be considered.

Which pattern is indicated?

     
Pattern 1
     
     
     
The engine cranking speed is OK. Go to step 8 (diagnosis by parameter (BATTERY)).
     
Pattern 2
     
     
     
Diagnostic procedure:?
1.
Test the 12 volt battery.
2.
Check the 12 volt battery cables and the connections.
3.
Check the starter.
4.
Check for engine friction.
8.
On-board snapshot or snapshot check (BATTERY):

On-board snapshot or snapshot check (BATTERY)
NOTE: Use the on-board snapshot in the case of an intermittent failure, or use the snapshot in the case of a reproducible failure.

?1.
Select the Hard to Start Engine in the on-board snapshot or snapshot with the HDS.


?2.
Select the BATTERY and ENGINE SPEED in the configuration list.
Check the recorded snapshot parameters while the engine is cranking, then compare the BATTERY pattern from the chart, and determine the problem.

Pattern
Symptom (Diagnosis by parameter)
Additional remarks
Pattern 1
BATTERY voltage low when cranking
When BATTERY voltage during cranking is too low, there is a possibility that PCM and/or engine will not start.
The PCM and other system control units require 7.0 V or more to start.
Pattern 2
BATTERY voltage normal when cranking
To start the engine, 7.0 V or more is needed

Which pattern is indicated?

     
Pattern 1
     
     
     
Diagnostic procedure:?
1.
Test the 12 volt battery.
2.
Check the 12 volt battery cables and the connections.
     
Pattern 2
     
     
     
The 12 volt battery is OK. Go to step 9 (diagnosis by parameter (ECT SENSOR 1)).
9.
On-board snapshot or snapshot check (ECT SENSOR 1):

On-board snapshot or snapshot check (ECT SENSOR 1)
NOTE: Use the on-board snapshot in the case of an intermittent failure, or use the snapshot in the case of a reproducible failure.

?1.
Select the Hard to Start Engine in the on-board snapshot or snapshot with the HDS.


?2.
Select the ECT SENSOR 1 and ENGINE SPEED in the configuration list.
Check the recorded snapshot parameters while the engine is cranking, then compare the ECT SENSOR 1 pattern from the chart, and determine the problem.

Pattern
Symptom (Diagnosis by parameter)
Additional remarks
Pattern 1
ECT SENSOR 1 high when cranking
When ECT SENSOR 1 indicates about 176 °F (80 °C) or more when the engine is cold (engine temp low), ECT sensor 1 may be stuck high. ECT compensation is not applied after the engine is warmed up, it is not necessary to check ECT sensor 1 (not a faulty part).
Pattern 2
ECT SENSOR 1 normal when cranking
If actual engine temp is nearly the same as the temp indicated by ECT sensor 1 when cranking, ECT sensor 1 is normal.

Which pattern is indicated?

     
Pattern 1
     
     
     
Check for a short in ECT sensor 1 circuit and a failure in ECT sensor 1.?
     
Pattern 2
     
     
     
Go to step 10.
10.
ECT sensor 1 check:

ECT sensor 1 check
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Let the engine cool for 24 hours.

?3.
Measure the ambient temperature of the engine with the thermometer.

?4.
Turn the vehicle to the ON mode, but do not start the engine.

?5.
Check the parameter(s) below with the HDS.
Signal
Current conditions
Values
Unit
ECT SENSOR 1
    
ECT SENSOR 2
    

Are the values of ECT SENSOR 1, ECT SENSOR 2, and the ambient temperature almost the same?

     
YES
     
     
     
ECT sensor 1 is OK. Go to step 11 (diagnosis by parameter (MAP SENSOR)).
     
NO
     
     
     
If the value of ECT SENSOR 1 is much higher (or lower) than that of ECT SENSOR 2 and the ambient temperature, check for ECT sensor 1 circuit and a failure in ECT sensor 1.?
11.
On-board snapshot or snapshot check (MAP SENSOR):

On-board snapshot or snapshot check (MAP SENSOR)
NOTE: Use the on-board snapshot in the case of an intermittent failure, or use the snapshot in the case of a reproducible failure.

?1.
Select the Hard to Start Engine in the on-board snapshot or snapshot with the HDS.


?2.
Select the MAP SENSOR and ENGINE SPEED in the configuration list.
Check the recorded snapshot parameters while the engine is cranking, then compare the MAP SENSOR pattern to the pattern from the chart below, and determine the problem.

Pattern
Symptom (Diagnosis by parameter)
Additional remarks
Pattern 1
MAP SENSOR detects no change of pressure when cranking
When MAP SENSOR detects no change of pressure when cranking, the pressure measurement port may be clogged. The PCM decides basic duration time of fuel injection from engine speed and MAP sensor signal when cranking.
Pattern 2
Normal when MAP SENSOR detects vacuum when cranking
When MAP SENSOR detects vacuum while cranking, the condition is normal and the MAP sensor pressure port is clear.

Which pattern is indicated?

     
Pattern 1
     
     
     
Check the pressure measurement port of the MAP sensor for clogging, foreign objects, etc.?
     
Pattern 2
     
     
     
The MAP sensor is OK. Go to step 12 (diagnosis by parameter (MAF SENSOR)).
12.
On- board snapshot or snapshot check (MAF SENSOR):

On- board snapshot or snapshot check (MAF SENSOR)
NOTE: Use the on-board snapshot in the case of an intermittent failure, or use the snapshot in the case of a reproducible failure.

?1.
Select the Hard to Start Engine in the on-board snapshot or the snapshot with the HDS.


?2.
Select the MAF SENSOR and ENGINE SPEED in the configuration list.
Check the recorded snapshot parameters while the engine is cranking, then compare the MAF SENSOR pattern from the chart, and determine the problem.

Pattern
Symptom (Diagnosis by parameter)
Additional remarks
Pattern 1
Poor connection of MAF SENSOR
Complete combustion stall: When MAF SENSOR indicates “0” 1?2 sec before ENGINE SPEED becomes 0 rpm, or when “0” is shown like noise, there may be a poor connection at the MAF sensor connector.
Pattern 2
MAF SENSOR output incorrect
When MAF SENSOR shows “0” when cranking or after start, clogging in MAF sensor's measurement port may be contaminated with debris or there may be a poor connection as its connector.
Pattern 3
MAF SENSOR Normal
When MAF SENSOR output compares with ENGINE SPEED when cranking or after starting, MAF sensor is normal.

Which pattern is indicated?

     
Pattern 1 and 2
     
     
     
Check for loose terminals or a poor connection at MAF sensor/IAT sensor 1.?
     
Pattern 3
     
     
     
MAF sensor/IAT sensor 1 is OK. Go to step 13 (diagnosis by parameter (FUEL PRESSURE CONVERTED FROM PF SENSOR and FUEL PRESSURE DIRECT INJECTION SYSTEM)).
13.
On-board snapshot or snapshot check (FUEL PRESSURE CONVERTED FROM PF SENSOR and FUEL PRESSURE DIRECT INJECTION SYSTEM):

On-board snapshot or snapshot check (FUEL PRESSURE CONVERTED FROM PF SENSOR and FUEL PRESSURE DIRECT INJECTION SYSTEM)
NOTE: Use the on-board snapshot in the case of an intermittent failure, or use the snapshot in the case of a reproducible failure.

?1.
Select the Hard to Start Engine in the on-board snapshot or snapshot with the HDS.


?2.
Select the FUEL PRESSURE CONVERTED FROM PF SENSOR, the FUEL PRESSURE DIRECT INJECTION SYSTEM, and ENGINE SPEED in the configuration list.
Check the recorded snapshot or on-board snapshot parameters while the engine is cranking, then compare the FUEL PRESSURE CONVERTED FROM PF SENSOR and FUEL PRESSURE DIRECT INJECTION SYSTEM patterns from the chart, and determine the problem.

Pattern
Symptom (Diagnosis by parameter)
Additional remarks
Pattern 1
The FUEL PRESSURE CONVERTED FROM PF SENSOR is low (almost 0 kPa) when cranking
If the FUEL PRESSURE CONVERTED FROM PF SENSOR is almost 0 kPa when cranking, a failure may exist in the fuel supply system.
Fuel leak, out of fuel
Fuel rail pressure sensor failure
Spill valve stuck off
Fuel pressure regulator (low pressure side)
Fuel pump (low pressure side)
High pressure fuel pump
Pattern 2
Normal when the FUEL PRESSURE CONVERTED FROM PF SENSOR follows the FUEL PRESSURE DIRECT INJECTION SYSTEM when cranking
If the FUEL PRESSURE CONVERTED FROM PF SENSOR is nearly the same as the FUEL PRESSURE DIRECT INJECTION SYSTEM when cranking, the fuel pressure is normal.

Fuel pressure may be low when the start of cranking.

Which pattern is indicated?

     
Pattern 1
     
     
     
     
Pattern 2
     
     
     
The fuel pressure is OK. Go to step 14 (diagnosis by parameter (CMP B NO PULSE)).
14.
On-board snapshot or snapshot check (CMP B NO PULSE):

On-board snapshot or snapshot check (CMP B NO PULSE)
NOTE: Use the on-board snapshot in the case of an intermittent failure, or use the snapshot in the case of a reproducible failure.

?1.
Select the Hard to Start Engine in the on-board snapshot or snapshot with the HDS.


?2.
Select the CMP B NO PULSE and ENGINE SPEED in the configuration list.
Check the recorded snapshot parameters while the engine is cranking, then compare the CMP B NO PULSE pattern from the chart, and determine the problem.

Pattern
Symptom (Diagnosis by parameter)
Additional remarks
Pattern 1
CMP B NO PULSE count increases continuously when cranking
When CMP B NO PULSE count increases continuously when cranking, no CMP pulse is received. If the CMP pulse is not received, the PCM cannot detect the cylinder to be ignited and the engine is unable to start.
Pattern 2
CMP B NO PULSE indicates the pulse is normal
It is normal when CMP B NO PULSE count does not increase, or goes up and down but does not increase continuously.

Which pattern is indicated?

     
Pattern 1
     
     
     
Do the troubleshooting procedure for DTC P0340. If the CMP B NO PULSE count reaches the malfunction threshold, DTC P0340 will set. Check for poor connections and loose terminals at the CMP sensor.?
     
Pattern 2
     
     
     
Go to step 15 (diagnosis by parameter (CMP B NOISE)).
15.
On-board snapshot or snapshot check (CMP B NOISE):

On-board snapshot or snapshot check (CMP B NOISE)
NOTE: Use the on-board snapshot in the case of an intermittent failure, or use the snapshot in the case of a reproducible failure.

?1.
Select the Hard to Start Engine in the on-board snapshot or snapshot with the HDS.


?2.
Select the CMP B NOISE and ENGINE SPEED in the configuration list.
Check the recorded snapshot parameters while the engine is cranking, then compare the CMP B NOISE pattern from the chart, and determine the problem.

Pattern
Symptom (Diagnosis by parameter)
Additional remarks
Pattern 1
CMP B NOISE count increases continuously when cranking
When CMP B NOISE count increases continuously when cranking, there is noise in the CMP signal. When CMP signal has noise, the PCM cannot detect the cylinder to be ignited and the engine is unable to start.
Pattern 2
CMP B NOISE indicates the pulse is normal
It is normal when CMP B NOISE count does not increase or increases but intermittently when cranking.

Which pattern is indicated?

     
Pattern 1
     
     
     
Do the troubleshooting procedure for DTC P0344. If the CMP B NOISE count reaches the malfunction threshold, DTC P0344 will set. Check for poor connections and loose terminals at the CMP sensor.?
     
Pattern 2
     
     
     
The CMP sensor B is OK. Go to step 16 (diagnosis by parameter (CKP NO PULSE)).
16.
On-board snapshot or snapshot check (CKP NO PULSE):

On-board snapshot or snapshot check (CKP NO PULSE)
NOTE: Use the on-board snapshot in the case of an intermittent failure, or use the snapshot in the case of a reproducible failure.

?1.
Select the Hard to Start Engine in the on-board snapshot or snapshot with the HDS.


?2.
Select the CKP NO PULSE and ENGINE SPEED in the configuration list.
Check the recorded snapshot parameters while the engine is cranking, then compare the CKP NO PULSE pattern from the chart, and determine the problem.

Pattern
Symptom (Diagnosis by parameter)
Additional remarks
Pattern 1
CKP NO PULSE counts go up continuously when cranking
When the CKP NO PULSE count increases continuously when cranking, the PCM is not receiving the correct CKP pulse.
Pattern 2
CKP NO PULSE indicates the pulse is normal
It is normal when the CKP NO PULSE count does not increase, or goes up and down but does not increase continuously.

Which pattern is indicated?

     
Pattern 1
     
     
     
Do the troubleshooting procedure for DTC P0335. If the CKP NO PULSE count reaches the malfunction threshold, DTC P0335 will set. Check for poor connections and loose terminals at the CKP sensor.?
     
Pattern 2
     
     
     
Go to step 17 (diagnosis by parameter (CKP NOISE)).
17.
On-board snapshot or snapshot check (CKP NOISE):

On-board snapshot or snapshot check (CKP NOISE)
NOTE: Use the on-board snapshot in the case of an intermittent failure, or use the snapshot in the case of a reproducible failure.

?1.
Select the Hard to Start Engine in the on-board snapshot or snapshot with the HDS.


?2.
Select the CKP NOISE and ENGINE SPEED in the configuration list.
Check the recorded snapshot parameters while the engine is cranking, then compare the CKP NOISE pattern from the chart, and determine the problem.

Pattern
Symptom (Diagnosis by parameter)
Additional remarks
Pattern 1
CKP NOISE count goes up continuously when cranking
When the CKP NOISE count increases continuously when cranking, the PCM is not receiving the correct CKP pulse.
Pattern 2
Normal when CKP NOISE count does not go up or goes up intermittently when cranking
It is normal when CKP NOISE count does not increase or increases but intermittently when cranking.

Which pattern is indicated?

     
Pattern 1
     
     
     
Do the troubleshooting procedure for DTC P0339. If the CKP NOISE count reaches the malfunction threshold, DTC P0339 will set. Check for poor connections and loose terminals at the CKP sensor, and also check for aftermarket accessories.?
     
Pattern 2 (Reproducible failure)
     
     
     
The CKP sensor is OK. Go to step 18 (diagnosis by parameter (EGR valve position sensor (EGR VLS))).
     
Pattern 2 (Intermittent failure)
     
     
     
The CKP sensor is OK. Go to step 20 (diagnosis by parameter (Engine Stall 2 in the on-board snapshot)).
18.
On-board snapshot or snapshot check (EGR valve position sensor (EGR VLS)):

On-board snapshot or snapshot check (EGR valve position sensor (EGR VLS))
?1.
Select the recorded snapshot with the HDS.

?2.
Select the EGR valve position sensor (EGR VLS) and ENGINE SPEED in the configuration list.
Check the recorded snapshot parameters while the engine is cranking, then compare the EGR valve position sensor (EGR VLS) pattern from the chart, and determine the problem.

Pattern
Symptom (Diagnosis by parameter)
Additional remarks
Pattern 1
EGR valve position sensor (EGR VLS) is 1.3 V or more
When EGR valve position sensor (EGR VLS) voltage during cranking is about 1.3 V or more, the engine start time is longer than normal condition
Pattern 2
EGR valve position sensor (EGR VLS) indicates the EGR is normal
EGR valve position sensor (EGR VLS) voltage during cranking is less than 1.3 V, the EGR valve position sensor is normal

Which pattern is indicated?

     
Pattern 1
     
     
     
Loosen the EGR valve mounting bolts, then install a metal plate between the EGR valve and the engine to shut out the EGR port. Recheck the engine start time. If the engine start time is normal, there is a failure in the EGR valve.?
     
Pattern 2 (except Mexico models M/T)
     
     
     
The EGR valve is OK. Go to step 19 (diagnosis by parameter (VTEC PRES SW)).
     
Pattern 2 (Mexico models M/T)
     
     
     
The EGR valve is OK. Go to step 20 (diagnosis by parameter (Engine Stall 2 in the on-board snapshot)).
19.
Snapshot check (VTEC PRES SW):

Snapshot check (VTEC PRES SW)
?1.
Check the parameter(s) below with the HDS while engine cranking.
Signal
Threshold
Current conditions
Values
Unit
Values
Unit
VTEC PRES SW
OFF
      

Do the current condition(s) match the threshold?

     
YES
     
     
     
     
NO
     
     
     
The rocker arm oil pressure switch is OK. Go to step 23 (fuel system troubleshooting).
20.
On-board snapshot check (Engine Stall 2):

On-board snapshot check (Engine Stall 2)
?1.
Check for a record of Engine Stall 2 in the on-board snapshot with the HDS.


Is an Engine Stall 2 on-board snapshot recorded?

     
YES
     
     
     
Go to step 21 (diagnosis by parameter AF FB (ST FUEL TRIM)).
     
NO
     
     
     
Go to step 23 (fuel system troubleshooting).
21.
On-board snapshot check AF FB (ST FUEL TRIM):

On-board snapshot check AF FB (ST FUEL TRIM)
?1.
Check for a record of Engine Stall 2 in the on-board snapshot with the HDS.


?2.
Select the AF FB (ST FUEL TRIM) and ENGINE SPEED in the configuration list.
Check the recorded snapshot parameters at the time of the engine stalls, then compare the AF FB (ST FUEL TRIM) pattern from the chart, and determine the problem.

Pattern
Symptom (Diagnosis by parameter)
Additional remarks
Pattern 1
Engine stalls while AF FB (ST FUEL TRIM) value is increasing
If the engine stalls while AF FB (ST FUEL TRIM) value is increasing, a failure may exist in the fuel system.
Pattern 2
Normal when the engine stalls when AF FB (ST FUEL TRIM) is around 1.0 (center value)
The fuel is normal when the engine stalls with AF FB (ST FUEL TRIM) around 1.0 (center value).

Which pattern is indicated?

     
Pattern 1
     
     
     
Diagnostic procedure:?
1.
Check the fuel pump operation sound.
2.
Go to the fuel pressure test.
3.
Go to the fuel pump circuit troubleshooting.
4.
Test PGM-FI main relay 1.
5.
Test PGM-FI main relay 2.
6.
Check for the following fuses:
No. B7 (15 A) fuse (in the under-hood fuse/relay box)
No. C32 (15 A) fuse (in the under-dash fuse/relay box)
     
Pattern 2
     
     
     
Go to step 22 (diagnosis by parameter (MISFIRE)).
22.
On-board snapshot check (MISFIRE):

On-board snapshot check (MISFIRE)
?1.
Check for a record of Engine Stall 2 in the on-board snapshot with the HDS.


?2.
Select the MISFIRE and ENGINE SPEED in the configuration list.
Check the recorded snapshot parameters at the time of the engine stalls, then compare those snapshots to the MISFIRE pattern from the chart, and determine the problem.

Pattern
Symptom (Diagnosis by parameter)
Additional remarks
Pattern 1
Engine stalls after MISFIRE counts increase
IF the engine stalls after MISFIRE count increases, the engine stall may be caused by misfire. Also the misfire may be caused by a loss of compression, faulty ignition system, faulty fuel system, etc.
Pattern 2
Normal when engine stalls with MISFIRE count remaining constant
If the MISFIRE count remains steady when the engine stalls, the stall was not caused by a misfire.

Which pattern is indicated?

     
Pattern 1
     
     
     
Diagnostic procedure:?
1.
If misfire counts go up without storing misfire DTC P0300?P0304, go to DTC P0300?P0304 troubleshooting.
2.
If the misfire count reaches the malfunction threshold, DTC P0300?P0304 is stored. Go to the DTC P0300?P0304 troubleshooting.
     
Pattern 2
     
     
     
Go to step 23 (fuel system troubleshooting).
23.
Fuel pressure check (low pressure side):

Fuel pressure check (low pressure side)
?1.
Do the fuel pressure test.

Is the fuel pressure OK?

     
YES
     
     
     
Go to step 24.
     
NO
     
     
     
24.
Spark plug visual check:

Spark plug visual check
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Remove the spark plugs.

?3.
Check the condition of the spark plug electrodes.
NOTE: Make sure the spark plugs are the correct part number for the vehicle. If the plugs are aftermarket or they are not the correct part number, replace all of the plugs and retest.

Is the electrode damage or wet?

     
YES (wet)
     
     
     
Check the following conditions. If those conditions do not apply, go to step 25.
In very cold conditions, multiple very short trips can cause the spark plug to foul. If this is the case, drive the vehicle a longer distance and recheck.?
Incorrect or poor quality fuel can cause a wet spark plug. Replace the fuel and recheck.?
     
YES (damaged)
     
     
     
Replace the damaged spark plugs, determine the cause of the spark plug damage.?
     
NO
     
     
     
Go to step 25.
25.
Determine possible failure area (ignition system, others):

Determine possible failure area (ignition system, others)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Fit a spark plug to the ignition coil and ground it to the engine.

?3.
Turn the vehicle to the ON mode.

?4.
Select ALL INJECTORS in the INSPECTION MENU with the HDS, and stop fuel injection from the injector.

  

?5.
Crank the engine and watch for spark at the spark plug.

Does the spark plug spark?

     
YES
     
     
     
The ignition system is OK. Select PCM reset in the PGM-FI INSPECTION MENU to cancel ALL INJECTORS STOP with the HDS, then go to step 27 (engine compression troubleshooting).
     
NO
     
     
     
Go to step 26.
26.
Ignition coil power circuit check:

Ignition coil power circuit check
?1.
Disconnect the following connector(s).
Ignition coil(s) 3P connector from the problem cylinder

?2.
Turn the vehicle to the ON mode.

?3.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
 
Ignition coil 3P connector: disconnected
Test point 1
Ignition coil 3P connector No. 1
Test point 2
Body ground


Is there battery voltage?

     
YES
     
     
     
The ignition coil power circuit is OK. Replace the ignition coil(s).?
     
NO
     
     
     
Repair an open in the ignition coil power circuit between the ignition coil relay and ignition coil.?
27.
Engine compression check:

Engine compression check
?1.
Do an engine compression inspection.

Is engine compression OK?

     
YES
     
     
     
Go to step 28 (EVAP canister purge valve check).
     
NO
     
     
     
Check for wear or damage to these parts:?
Incorrect valve clearance
Confirmation of cam timing
Oil pressure relief valve
Damage or worn cam lobes
Damage or worn valve and seats
Damage cylinder head gasket
Damage or worn piston rings
Damage or worn piston and cylinder bore
28.
EVAP canister purge valve check:

EVAP canister purge valve check
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connector.
EVAP canister purge valve 2P connector

?3.
Disconnect the vacuum hose (A) from the EVAP canister purge valve (B) in the engine compartment, and connect the vacuum pump/gauge, 0?30 inHg, to the purge valve.


?4.
Start the engine.

Does the vacuum pump indicate vacuum?

     
YES
     
     
     
     
NO (Reproducible failure)
     
     
     
Go to step 29 (fuse check).
     
NO (Intermittent failure)
     
     
     
Go to step 30 (relay check).
29.
Fuse check:

Fuse check
?1.
Check the following fuses.
Fuse
No. B4 (15 A) to the ETCS control relay
No. B8 (15 A) to the ignition coil relay
No. B10 (20 A) to the injector relay
No. B7 (15 A) to PGM-FI main relay 1
Location
Under-hood fuse/relay box

Fuse
No. C32 (15 A) to PGM-FI main relay 2
Location
Under-dash fuse/relay box

Are the fuses OK?

     
YES
     
     
     
The fuses are OK. Go to step 30 (relay check).
     
NO
     
     
     
Replace the blown fuse(s).?
30.
Relay check:

Relay check
?1.
Test the following relays:
NOTE: In case the failure is not reproduced, the following relays may have an intermittent failure.
PGM-FI main relay 1
PGM-FI main relay 2
ETCS control relay
Ignition coil relay
Injector relay

Are the relays OK?

     
YES
     
     
     
Go to step 31 (power and ground terminal check).
     
NO
     
     
     
Replace any damaged relays.?
31.
Power and ground terminal check:

Power and ground terminal check
?1.
Check the corrosion and looseness at the following terminals:
12 volt battery terminals
Ground cable terminals between the engine and the body ground, and the transmission and the body ground
Engine wire harness ground (G101, G102)

Are the terminals OK?

     
YES
     
     
     
Go to step 32 (connector terminal check).
     
NO
     
     
     
Repair any terminal(s) as needed.?
32.
Connector terminal check:

Connector terminal check
?1.
Check the foreign objects clogged and corrosion at the following connector terminals:
PCM connectors
?
FI MAIN RLY OUT, FI MAIN RLY CL-
?
VBDBW, DBW RLY CL-
?
IG1 FUEL PUMP, FUEL PUMP RLY CL-
?
INJ RLY OUT, INJ RLY CL-
?
PG2, PG3, LG
?
INJH1, INJL1, INJH2, IMJL2, INJH3, INJL3, INJH4, INJL4
?
IGN01, IGN02, IGN03, IGN04
?
HPUMP H, HPUMP L
?
TDCAM
?
CRKN
?
PB
?
VGP, VGM
?
TW
?
PCS
?
E-EGR, EGRL
?
MTR1, MTR2, THL1, THL2
CMP sensor
CKP sensor
Ignition coils
Injectors
ECT sensor
MAF sensor
MAP sensor
EGR valve
Throttle body
EVAP canister purge valve
Fuel tank unit
High pressure fuel pump

Are the terminals OK?

     
YES
     
     
     
     
NO
     
     
     
Repair any terminal(s) as needed.?