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.
?
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 occurred and the parameter (total mileage) in the on-board snapshot information. Make sure the date when the failure occurred 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:
?
Make sure the 12 volt battery is fully charged.
?
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
     

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
     
     
     
     
NO
     
     
     
Go to step 3.
3.
Problem verification (snapshot sampling):

Problem verification (snapshot sampling)
?1.
Set the HDS to record a SNAPSHOT of following full data list for 30 seconds.
IMMOBILIZER
ENGINE SPEED
BATTERY
ECT SENSOR 1
MAP SENSOR (HI RES)
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
VTEC PRES SW

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

Is the engine hard to start?

     
YES
     
     
     
Go to step 5 (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 5 (diagnosis by parameter troubleshooting).
     
NO
     
     
     
Go to step 18 (fuel system troubleshooting).
NOTE: In case of the following conditions, the on-board snapshot cannot be recorded.
The vehicle is turned to the OFF (LOCK) mode after starting the engine.
Vehicle condition not in the on-board snapshot recoding zone of Hard to start engine.
Low or dead 12 volt battery
Replacing the 12 volt battery
5.
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 6 (diagnosis by parameter (ENGINE SPEED)).
6.
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 7 (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.
7.
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 8 (diagnosis by parameter (ECT SENSOR 1)).
8.
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 the ECT sensor 1 circuit and a failure in ECT sensor 1.?
     
Pattern 2
     
     
     
Go to step 9.
9.
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 10 (diagnosis by parameter (MAF 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 the ECT sensor 1 circuit and a failure in ECT sensor 1.?
10.
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 snapshot with the HDS.


?2.
Select the MAF SENSOR and ENGINE SPEED in the configuration list.
Check the recorded snapshot or on-board 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 at its connector.
Pattern 3
MAF SENSOR Normal
When MAF SENSOR output compares with ENGINE SPEED when cranking or after starting, the MAF sensor is normal.

Which pattern is indicated?

     
Pattern 1 and 2
     
     
     
Check for loose terminals or a poor connection at the MAF sensor.?
     
Pattern 3
     
     
     
MAF sensor/IAT sensor 1 is OK. Go to step 11 (diagnosis by parameter (MAP SENSOR (HI RES))).
11.
On-board snapshot or snapshot check (MAP SENSOR (HI RES)):

On-board snapshot or snapshot check (MAP SENSOR (HI RES))
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 (HI RES) and ENGINE SPEED in the configuration list.
Check the recorded snapshot parameters while the engine is cranking, then compare the MAP SENSOR (HI RES) 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 (FUEL PRESSURE CONVERTED FROM PF SENSOR and FUEL PRESSURE DIRECT INJECTION SYSTEM)).
12.
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 13 (diagnosis by parameter (CMP B NO PULSE)).
13.
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
The 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
     
     
     
Go to the troubleshooting 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 CMP sensor A.?
     
Pattern 2
     
     
     
Go to step 14 (diagnosis by parameter (CMP B NOISE)).
14.
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
The 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
     
     
     
Go to the troubleshooting 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 CMP sensor A.?
     
Pattern 2
     
     
     
CMP sensor A is OK. Go to step 15 (diagnosis by parameter (CKP NO PULSE)).
15.
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
The 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
     
     
     
Go to the troubleshooting 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 16 (diagnosis by parameter (CKP NOISE)).
16.
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
     
     
     
Go to the troubleshooting 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
     
     
     
The CKP sensor is OK. Go to step 17 (diagnosis by parameter (VTEC PRES SW)).
17.
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 18 (fuel system troubleshooting).
18.
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 19 (ignition system troubleshooting).
     
NO
     
     
     
19.
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 have the correct part number for the vehicle. If the plugs are aftermarket's products or they do not have 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 20.
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 20.
20.
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 STOP in the INSPECTION MENU with the HDS, and stop fuel injection operation.

  

?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 22 (engine compression troubleshooting).
     
NO
     
     
     
Go to step 21.
21.
Ignition coil power circuit check:

Ignition coil power circuit check
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connector(s).
Ignition coil(s) 3P connector from the problem cylinder

?3.
Turn the vehicle to the ON mode.

?4.
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 (female terminals) 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 IG COIL RLY OUT/IG1(IGN) wire between the ignition coil relay and the ignition coil.?
22.
Engine compression check:

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

Is engine compression OK?

     
YES
     
     
     
Go to step 23 (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
23.
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 (purge line) (A) from the EVAP canister purge valve (B) in the engine compartment, and connect a vacuum pump/gauge, 0?30 inHg, to the purge valve.


?4.
Start the engine.

Does the vacuum pump indicate vacuum?

     
YES
     
     
     
When the climate is warm, fuel vapor from the canister line to the fuel tank enters intake manifold, enriching mixture (excessively rich), causing the engine to stall in some cases. If needed, replace the EVAP canister purge valve.?
     
NO (Reproducible failure)
     
     
     
Go to step 24 (fuse check).
     
NO (Intermittent failure)
     
     
     
Go to step 25 (relay check).
24.
Fuse check:

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

?2.
Check the following fuses.
Fuse
No. A7 (20 A) to the relay circuit board (PGM-FI main relay 1 circuit)
No. A15 (15 A) to the relay circuit board (ignition coil relay circuit)
No. A9 (15 A) to the relay circuit board (PGM-FI subrelay circuit)
Location
Under-hood fuse/relay box

Fuse
No. B8 (20 A) to PGM-FI main relay 2
Location
Under-dash fuse/relay box

Are the fuses OK?

     
YES
     
     
     
Go to step 25 (relay check).
     
NO
     
     
     
Replace the blown fuse(s).?
25.
Relay check:

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

?2.
Test the following relays:
NOTE: In situations where the failure is difficult to reproduce, the following relays may have an intermittent failure.


Are the relay circuit board and the relay OK?

     
YES
     
     
     
Go to step 26 (power and ground terminal check).
     
NO
     
     
     
Replace any damaged relays.?
26.
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)
Engine compartment wire harness ground (G301)

Are the terminals OK?

     
YES
     
     
     
Go to step 27 (connector terminal check).
     
NO
     
     
     
Repair any terminal(s) as needed.?
27.
Connector terminal check:

Connector terminal check
?1.
Check the foreign objects clogged and corrosion at the following connector terminals:
PCM connectors
?
+B BACKUP FI-ECU
?
FI MAIN RLY OUT, FI MAIN RLY CL-
?
IG1 FUEL PUMP, FUEL PUMP RLY CL-
?
FI SUB RLY OUT, FI SUB RLY CL-
?
GND
?
INJ H1, INJ L1, INJ H2, INJ L2, INJ H3, INJ L3, INJ H4, INJ L4
?
IGN01, IGN02, IGN03, IGN04
?
HPUMP H, HPUMP L
?
CAM
?
CAMEX
?
CRK
?
PB
?
TW
?
PCS
?
MTR1, MTR2, THL1, THL2
?
AFM
CMP sensor A
CMP sensor B
CKP sensor
Ignition coils
Injectors
High pressure fuel pump
ECT sensor
MAF sensor/IAT sensor 1
MAP sensor/IAT sensor 2
Throttle body
EVAP canister purge valve
Fuel tank unit

Are the terminals OK?

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