*ENGINE WILL NOT CRANK

For a complete wiring diagram Refer to Section 8W

Possible Causes

BATTERY CABLES

LOW BATTERY/POOR BATTERY CONNECTION

CLUTCH INTERLOCK SWITCH INPUT

MECHANICAL PROBLEM

SKIM CODES PRESENT

STARTER MOTOR

TOTALLY INTEGRATED POWER MODULE

(T750) STARTER CONTROL OUTPUT CIRCUIT SHORT TO GROUND

(T750) STARTER CONTROL OUTPUT CIRCUIT OPEN

Diagnostic Test

1. BATTERY CABLES

NOTE: Ensure there are no Active DTC's in the ECM or TIPM. If the ECM or TIPM have Active DTC's, repair these DTC's before continuing with No Crank diagnosis.

Turn the ignition off.

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

Inspect the battery cables for corrosion, looseness or other problems.

Is there evidence of problems?

Yes

Repair as necessary.

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

Go To 2

2. ECM POWER AND GROUND CIRCUITS

Refer to CHECKING THE ECM POWER AND GROUNDS to check for proper ignition, battery and ground supply to the ECM.

Are the Ignition, Battery and Ground supply circuits functioning properly at the ECM?

Yes

Go To 3
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

Repair as necessary.

3. SKIM CODES PRESENT

Turn the ignition on.
With the scan tool, read the SKIM DTCs.

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 To 4

4. CHECKING STARTER OPERATION

NOTE: The Starter Motor Fuse in the TIPM must not be open for this test to be valid. Check the condition of the Starter Motor Fuse in the TIPM. If the fuse is open, replace and attempt to crank the engine.

Turn the ignition off.
Disconnect the (T750) Starter Control Output circuit at the Starter Motor.
With a 12–volt test light connected to ground, probe the (T750) Starter Control Output circuit.
Fully depress the clutch pedal.
While observing the test light, turn the ignition switch to the Crank/Start position.

Is the test light illuminated brightly?

Yes

Go To 5

Go To 6

5. MECHANICAL PROBLEM

Turn the ignition off.
Attempt to manually rotate the crankshaft 360°.

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).

6. VERIFY CLUTCH SWITCH INPUTS

Turn the ignition on.
With the scan tool, read the Clutch Upstop Switch and Clutch Interlock Switch inputs while fully depressing and releasing the clutch pedal.

Does the input for both switched change state while fully depressing and releasing the clutch pedal?

Yes

Go To 7

Refer to the Service Information related to the Clutch Switch. Repair or replace Clutch Switch or Clutch Switch circuitry as necessary to correct Clutch Switch input to the ECM.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

7. (T750) STARTER CONTROL OUTPUT CIRCUIT OPEN

Turn the ignition off.
Disconnect the TIPM C8 harness connector.
Connect the (T750) Starter Control Output wire (at the Starter) to ground.
Using a 12-volt test light connected to 12-volts, check the (T750) Starter Relay Output circuit at the TIPM C8 harness connector.

Does the test light illuminate brightly?

Yes

Go To 8

Repair the (T750) Starter Relay Output circuit for an open.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

8. (T750) STARTER CONTROL OUTPUT CIRCUIT SHORT TO GROUND

Measure the resistance between ground and the (T750) Starter Control Output circuit.

Is the resistance above 1000 ohms?

Yes

Go To 9

Repair the (T750) Starter Control Output circuit for a short to ground.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

9. CHECK WIRING, CONNECTORS AND TERMINALS

Turn the ignition off.
Check the wiring, connectors and terminals associated with the Starter Relay, Main Relay and Clutch Switch circuits. Check for poor terminal contact, corrosion, spread terminals, improper connections or other problems that could cause an intermittent condition.

Were any problems found?

Yes

Repair or replace wiring, connector or terminals as necessary.

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

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