*ENGINE WILL NOT CRANK

For a complete wiring diagram Refer to Section 8W

Possible Causes

BATTERY CABLE HIGH RESISTANCE

BATTERY CABLES

CLUTCH INTERLOCK SWITCH

CLUTCH INTERLOCK SWITCH OUTPUT CIRCUIT

IGNITION SWITCH START OUTPUT CIRCUIT OPEN

MECHANICAL PROBLEM

OPEN FUSED BATTERY (+) CIRCUIT

OPEN IGNITION SWITCH START OUTPUT

P/N SWITCH

P/N SWITCH CIRCUIT OPEN

P/N SWITCH GROUND CIRCUIT OPEN

SKIM CODES PRESENT

STARTER MOTOR

STARTER RELAY

STARTER RELAY GROUND CIRCUIT OPEN

STARTER RELAY OUTPUT CIRCUIT OPEN

Diagnostic Test

1.BATTERY CABLES

NOTE: The battery must be fully charged before diagnosing a no crank condition.

Is there evidence of problems?

Yes

Repair as necessary.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

Go To2

2.SKIM CODES PRESENT

Does the scan tool display any SKIM DTCs?

Yes

Refer to symptom list for problems related to SKIM.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

Go To3

3.AUTOMATIC OR MANUAL TRANSMISSION

Is the vehicle equipped with an automatic transmission?

Yes

Go To4

Go To9

4.CHECKING STARTER OPERATION

WARNING: THE TRANSMISSION MUST BE IN PARK/NEUTRAL AND THE PARK BRAKE MUST BE SET FOR THIS TEST.

WARNING: THE ENGINE MAY CRANK IN THE NEXT STEP. WHEN THE ENGINE IS CRANKING, DO NOT STAND IN A DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.

Did the engine crank?

Yes

Go To5

Go To14

5.OPEN IGNITION SW START CIRCUIT

Does the test light illuminate with the ignition switch in the START position?

Yes

Go To6

Repair the Ignition Switch Start Output circuit between the Starter Relay and the ECM for an open.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

6.STARTER RELAY

Does the engine crank?

Yes

Replace the Starter Relay.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

Go To7

7.TRS SWITCH

Does the TRS status change?

Yes

Go To8

Replace the TRS in accordance with the Service Information.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

8.TRS CIRCUIT OPEN/SHORT

Does the test light illuminate brightly?

Yes

Repair the (T41) Switch Sense circuit between the (T41) TRS Switch and the (cavity B17) ECM.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

Repair the P/N Switch Ground circuit for an open.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

9.CHECKING STARTER OPERATION

WARNING: THE TRANSMISSION MUST BE IN NEUTRAL AND THE PARK BRAKE MUST BE SET FOR THIS TEST.

Did the engine crank?

Yes

Go To10

Go To14

10.OPEN IGNITION SW START CIRCUIT

Does the test light illuminate with the ignition switch in the START position?

Yes

Go To11

Go To12

11.STARTER RELAY

Does the engine crank?

Yes

Replace the Starter Relay.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

Repair the Starter Relay Ground Circuit for an open.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

12.CLUTCH INTERLOCK SWITCH

Does the test light illuminate with the ignition switch in the Start position?

Yes

Replace the Clutch Interlock Switch.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

Go To13

13.CLUTCH INTERLOCK SWITCH OUTPUT CIRCUIT OPEN

Is the resistance below 10.0 ohms?

Yes

Repair the Ignition Switch Start Output circuit to the Clutch Interlock Switch.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

Repair the Clutch Interlock Switch Output circuit for an open.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

14.OPEN FUSED BATTERY (+) CIRCUIT

Is the test light on?

Yes

Go To15

Repair the Fused B(+) circuit for an open.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

15.STARTER RELAY OUTPUT CIRCUIT OPEN

Does the test light illuminate brightly?

Yes

Go To16

Repair the Starter Relay Output circuit for an open.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

16.BATTERY CABLE HIGH RESISTANCE

Did either battery cable have a voltage drop greater than 0.2 volts?

Yes

Replace the battery cable(s).
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

Go To17

17.MECHANICAL PROBLEM

Is the crankshaft able to rotate 360°?

Yes

Replace the Starter Motor.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

Repair the engine mechanical problem.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).