Starter System Circuit Troubleshooting
Starter System Circuit Troubleshooting
NOTE:
Air temperature must be between 59?100 °F (15?38 °C) during this procedure.
The battery must be in good condition and fully charged.
1.
Keyless access system check:

Keyless access system check
?1.
Press the engine start/stop button to select the ON mode.

Is the vehicle in ON mode?

     
YES
     
     
     
Go to step 2.
     
NO
     
     
     
2.
Starting system check:

Starting system check
?1.
With the shift lever in P and with the brake pedal pressed, press the engine start/stop button to select the START mode.

Did the starter crank the engine?

     
YES
     
     
     
The system is OK at this time.?
     
NO
     
     
     
Go to step 3.
3.
Electrical connection check (at battery):

Electrical connection check (at battery)
?1.
Press the engine start/stop button to select the OFF mode.

?2.
Check electrical connections at the battery.

Is the connection OK?

     
YES
     
     
     
Go to step 4.
     
NO
     
     
     
Repair the electrical connection(s) at the battery.?
4.
Open wire check (+B BATTERY line):

Open wire check (+B BATTERY line)
?1.
Measure the voltage between test points 1 and 2.
Test condition
OFF mode
Test circuit
+B BATTERY
Test point 1
Starter B terminal (BLK)
Test point 2
Body ground


Is there battery voltage?

     
YES
     
     
     
Go to step 5.
     
NO
     
     
     
Repair an open in the +B BATTERY wire between the starter B terminal and the battery.?
5.
DLC circuit check:

DLC circuit check
?1.
Connect the HDS to the DLC.

?2.
Make sure the HDS communicates with the vehicle and the PCM.

Does the HDS communicate with the vehicle?

     
YES
     
     
     
Go to step 6.
     
NO
     
     
     
6.
PGM-FI, A/T, and Keyless Access Control system DTC check:

PGM-FI, A/T, and Keyless Access Control system DTC check
?1.
Press the engine start/stop button to select the ON mode.

?2.
Check for PGM-FI, A/T, and Keyless Access Control system DTCs with the HDS. If you fail to enter the SYSTEM SELECTION MENU with the HDS, go to the keyless access system symptom troubleshooting "Cannot select ON mode with keyless access and with the keyless remote touched the engine start/stop switch".
PGM-FI system
DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
       

A/T system
DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
       

Keyless Access Control system
DTC Description
DTC
Freeze Frame
     

Are any DTCs indicated?

     
YES
     
     
     
Go to the indicated DTC's troubleshooting.?
     
NO
     
     
     
Go to step 7.
7.
A/T gear position indicator P position signal check:

A/T gear position indicator P position signal check
?1.
Shift the shift lever in P.

?2.
Check that the P position indicator in the gauge control module comes on.

Does the P position indicator come on?

     
YES
     
     
     
Go to step 8.
     
NO
     
     
     
Repair an open in the PG wire between the transmission range switch and ground (G101). If the PG wire was OK, replace the transmission range switch.?
8.
FOOT BRAKE signal check:

FOOT BRAKE signal check
?1.
When repeatedly pressing and releasing the brake pedal, check the parameter(s) below with the HDS.
Keyless Access Control system
Signal
Current conditions
Values
Unit
FOOT BRAKE
    

Is ON or OFF changed when you are operating the brake pedal?

     
YES
     
     
     
Go to step 11.
     
NO
     
     
     
Go to step 9.
9.
Brake lights circuit check:

Brake lights circuit check
?1.
When pressing the brake pedal, check that the brake lights are ON.

Are the brake lights turned ON?

     
YES
     
     
     
Go to step 10.
     
NO
     
     
     
Check and repair the brake lights circuit.?
10.
Open wire check (STOP SW line):

Open wire check (STOP SW line)
?1.
Press the engine start/stop button to select the OFF mode.

?2.
Disconnect the following connector.

?3.
Press the brake pedal.

?4.
Measure the voltage between test points 1 and 2.
Test condition
OFF mode, press brake pedal
Keyless access control unit connector B (28P): disconnected
Test circuit
STOP SW
Test point 1
Keyless access control unit connector B (28P) No. 1 (LT GRN)
Test point 2
Body ground


Is there battery voltage?

     
YES
     
     
     
The keyless access control unit internal STOP SW circuit is open. Replace the keyless access control unit.?
     
NO
     
     
     
Repair an open in the STOP SW wire between the brake pedal position switch and the keyless access control unit.?
11.
Determine possible failure area (open in STC line, short in STC line):

Determine possible failure area (open in STC line, short in STC line)
?1.
Press the brake pedal.

?2.
Press the engine start/stop button and hold it.

?3.
Check the parameter(s) below with the HDS.
Keyless Access Control system
Signal
Current conditions
Values
Unit
STRQ
    

Is there battery voltage indicated?

     
YES
     
     
     
Go to step 12.
     
NO
     
     
     
Go to step 15.
12.
STARTER SWITCH signal check:

STARTER SWITCH signal check
?1.
Press the brake pedal.

?2.
Press the engine start/stop button and hold it.

?3.
Check the parameter(s) below with the HDS.
PGM-FI system
Signal
Threshold
Current conditions
Values
Unit
Values
Unit
STARTER SWITCH
ON
      

Do the current condition(s) match the threshold?

     
YES
     
     
     
Go to step 17.
     
NO
     
     
     
Go to step 13.
13.
Open wire check (PCM internal STC circuit):

Open wire check (PCM internal STC circuit)
?1.
Press the engine start/stop button to select the OFF mode.

?2.
Jump the SCS line with the HDS.
NOTE: This step must be done to protect the PCM from damage.


?3.
Disconnect the following connector.

?4.
Press the engine start/stop button to select the ON mode.

?5.
Press the brake pedal.

?6.
Press the engine start/stop button and hold it.

?7.
Measure the voltage between test points 1 and 2.
Test condition
START mode, press brake pedal
PCM connector A (51P): disconnected
Test circuit
STC
Test point 1
PCM connector A (51P) No. 27 (LT BLU)
Test point 2
Body ground


Is there battery voltage?

     
YES
     
     
     
Update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If the PCM was substituted, and the symptom/indication goes away, replace the original PCM.?
     
NO
     
     
     
Go to step 14.
14.
Open wire check (STC line):

Open wire check (STC line)
?1.
Press the engine start/stop button to select the OFF mode.

?2.
Disconnect the following connector.

?3.
Check for continuity between test points 1 and 2.
Test condition
OFF mode
PCM connector A (51P): disconnected
Keyless access control unit connector C (24P): disconnected
Test circuit
STC
Test point 1
Keyless access control unit connector C (24P) No. 18 (LT BLU)
Test point 2
PCM connector A (51P) No. 27 (LT BLU)


Is there continuity?

     
YES
     
     
     
The keyless access control unit internal STC circuit is open. Replace the keyless access control unit.?
     
NO
     
     
     
Repair an open in the STC wire between the keyless access control unit and the PCM.?
15.
Shorted wire check (PCM internal STC circuit):

Shorted wire check (PCM internal STC circuit)
?1.
Press the engine start/stop button to select the OFF mode.

?2.
Jump the SCS line with the HDS.
NOTE: This step must be done to protect the PCM from damage.


?3.
Disconnect the following connector.

?4.
Press the engine start/stop button to select the ON mode.

?5.
Press the brake pedal.

?6.
Press the engine start/stop button and hold it.

?7.
Check the parameter(s) below with the HDS.
Keyless Access Control system
Signal
Current conditions
Values
Unit
STRQ
    

Is there battery voltage?

     
YES
     
     
     
Update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If the PCM was substituted, and the symptom/indication goes away, replace the original PCM.?
     
NO
     
     
     
Go to step 16.
16.
Shorted wire check (STC line):

Shorted wire check (STC line)
?1.
Press the engine start/stop button to select the OFF mode.

?2.
Disconnect the following connector.

?3.
Measure the resistance between test points 1 and 2.
Test condition
OFF mode
PCM connector A (51P): disconnected
Keyless access control unit connector C (24P): disconnected
Test circuit
STC
Test point 1
PCM connector A (51P) No. 27 (LT BLU)
Test point 2
Body ground


Is there 1.0 M? or more?

     
YES
     
     
     
The keyless access control unit internal STC circuit is shorted. Replace the keyless access control unit.?
     
NO
     
     
     
Repair a short in the STC wire between the keyless access control unit and the PCM.?
17.
STARTER RELAY CONTROL RETURN signal check:

STARTER RELAY CONTROL RETURN signal check
?1.
Shift the transmission in P or N.

?2.
Check the parameter(s) below with the HDS.
PGM-FI system
Signal
Threshold
Current conditions
Values
Unit
Values
Unit
STARTER RELAY CONTROL RETURN
OFF
      

Do the current condition(s) match the threshold?

     
YES
     
     
     
Go to step 20.
     
NO
     
     
     
Go to step 18.
18.
Starter cut relay 1 check:

Starter cut relay 1 check
?1.
Test the relay circuit board.

Is the relay OK?

     
YES
     
     
     
Go to step 19.
     
NO
     
     
     
Replace the relay circuit board.?
19.
Open wire check (ST CUT RLY1 CL- line):

Open wire check (ST CUT RLY CL1- line)
?1.
Install the relay circuit board.

?2.
Jump the SCS line with the HDS.
NOTE: This step must be done to protect the PCM from damage.


?3.
Disconnect the following connector.

?4.
Shift the transmission to P or N.

?5.
Press the engine start/stop button to select the ON mode.

?6.
Press the brake pedal.

?7.
Press the engine start/stop button and hold it.

?8.
Measure the voltage between test points 1 and 2.
Test condition
START mode, press brake pedal
PCM connector A (51P): disconnected
Test circuit
ST CUT RLY1 CL-
Test point 1
PCM connector A (51P) No. 3 (GRN)
Test point 2
Body ground


Is there battery voltage?

     
YES
     
     
     
Update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If the PCM was substituted, and the symptom/indication goes away, replace the original PCM.?
     
NO
     
     
     
Repair an open in the ST CUT RLY1 CL- wire between the relay circuit board and the PCM.?
20.
STARTER CUT CTRL RETURN signal check:

STARTER CUT CTRL RETURN signal check
?1.
Shift the transmission in P or N.

?2.
Check the parameter(s) below with the HDS.
PGM-FI system
Signal
Threshold
Current conditions
Values
Unit
Values
Unit
STARTER CUT CTRL RETURN
OFF
      

Do the current condition(s) match the threshold?

     
YES
     
     
     
Go to step 23.
     
NO
     
     
     
Go to step 21.
21.
Starter cut relay 2 check:

Starter cut relay 2 check
?1.
Test the relay circuit board.

Is the relay OK?

     
YES
     
     
     
Go to step 22.
     
NO
     
     
     
Replace the relay circuit board.?
22.
Open wire check (ST CUT RLY2 CL- line):

Open wire check (ST CUT RLY2 CL- line)
?1.
Install the relay circuit board.

?2.
Jump the SCS line with the HDS.
NOTE: This step must be done to protect the PCM from damage.


?3.
Disconnect the following connector.

?4.
Shift the transmission to P or N.

?5.
Press the engine start/stop button to select the ON mode.

?6.
Press the brake pedal.

?7.
Press the engine start/stop button and hold it.

?8.
Measure the voltage between test points 1 and 2.
Test condition
START mode, press brake pedal
PCM connector A (51P): disconnected
Test circuit
ST CUT RLY2 CL-
Test point 1
PCM connector A (51P) No. 4 (BRN)
Test point 2
Body ground


Is there battery voltage?

     
YES
     
     
     
Update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If the PCM was substituted, and the symptom/indication goes away, replace the original PCM.?
     
NO
     
     
     
Repair an open in the ST CUT RLY2 CL- wire between the relay circuit board and the PCM.?
23.
STARTER CUT RELAY signal check:

STARTER CUT RELAY signal check
?1.
Press the brake pedal.

?2.
Press the engine start/stop button and hold it.

?3.
Check the parameter(s) below with the HDS.
PGM-FI system
Signal
Threshold
Current conditions
Values
Unit
Values
Unit
STARTER CUT RELAY
More than 2.2
V
    

Do the current condition(s) match the threshold?

     
YES
     
     
     
Go to step 25.
     
NO
     
     
     
Go to step 24.
24.
Starter cut relay 1 check:

Starter cut relay 1 check
?1.
Press the engine start/stop button to select the OFF mode.

?2.
Test the relay circuit board.

Is the relay OK?

     
YES
     
     
     
Check the No. A12-10 (ST MG) (30 A) fuse. If the fuse is OK, replace the under-hood fuse/relay box.?
     
NO
     
     
     
Replace the relay circuit board.?
25.
Starter cut relay 2 check:

Starter cut relay 2 check
?1.
Press the engine start/stop button to select the OFF mode.

?2.
Test the relay circuit board.

Is the relay OK?

     
YES
     
     
     
Go to step 26.
     
NO
     
     
     
Replace the relay circuit board.?
26.
Determine possible failure area (starter, others):

Determine possible failure area (starter, others)
?1.
Install the relay circuit board.

?2.
Disconnect the following connector.

?3.
Press the brake pedal.

?4.
Press the engine start/stop button and hold it.

?5.
Measure the voltage between test points 1 and 2.
Test condition
START mode, press brake pedal
Starter S terminal 1P connector: disconnected
Test circuit
STMG
Test point 1
Starter S terminal 1P connector No. 1 (BLK/WHT)
Test point 2
Body ground


Is there battery voltage?

     
YES
     
     
     
     
NO
     
     
     
Repair an open in the STMG wire between the relay circuit board and the starter.?