*ENGINE WILL NOT CRANK
For a complete wiring diagram Refer to Section 8W
Possible Causes
|
BATTERY CABLE HIGH RESISTANCE
|
BATTERY CABLES
|
ECM
|
MECHANICAL PROBLEM
|
OPEN FUSED BATTERY (+) CIRCUIT
|
STARTER COIL DRIVER (INTERNAL TIPM)
|
SKREEM CODES PRESENT
|
STARTER MOTOR
|
STARTER RELAY
|
(T752) STARTER RELAY CONTROL CIRCUIT OPEN
|
(T752) STARTER RELAY CONTROL CIRCUIT SHORTED TO VOLTAGE
|
(T750) STARTER RELAY OUTPUT CIRCUIT OPEN
|
Diagnostic Test
1.
BATTERY CABLES
NOTE:
The battery must be fully charged before diagnosing a no crank condition.
Turn the ignition off.
Inspect the battery cables for corrosion, looseness or other problems.
Is there evidence of problems?
Yes
No
2.
BATTERY CABLE HIGH RESISTANCE
Using the Service Information, check the battery cables for high resistance.
Did either battery cable have a voltage drop greater than 0.2 volts?
Yes
No
3.
SKREEM CODES PRESENT
Turn the ignition on.
With the scan tool, read the SKREEM DTCs.
Does the scan tool display any SKREEM DTCs?
Yes
No
4.
TIPM CAN BUS CODES PRESENT
With the scan tool, read the TIPM DTCs.
NOTE:
If there are CAN BUS related problems the TIPM will not supply power to the Starter Relay coil.
Does the scan tool display any CAN Bus related DTCs in the TIPM?
Yes
No
5.
CHECKING STARTER OPERATION
Turn the ignition off.
Remove the Starter Relay from the TIPM.
WARNING:
THE TRANSMISSION MUST BE IN 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.
Momentarily jumper Starter Relay connector cavities 30 and 87 in the TIPM connector.
Did the engine crank?
Yes
No
6.
STARTER RELAY
Install a known good relay in place of the Starter Relay.
Attempt to start the engine.
Does the engine crank?
Yes
No
7.
CHECK POWER AND GROUNDS
Refer to the symptom list and perform the Checking the ECM Power and Ground test.
Were any problem found with the ECM powers and grounds?
Yes
No
8.
STARTER COIL DRIVE CIRCUIT (INTERNAL TIPM)
Turn the ignition off.
Remove the Starter Relay from the TIPM.
Using a 12-volt test light connected to ground, check the Starter Coil Driver circuit in the Starter Relay connector while turning the ignition switch to the START position.
Does the test light illuminate with the ignition switch in the START position?
Yes
No
9.
(T752) STARTER RELAY CONTROL CIRCUIT SHORTED TO VOLTAGE
Turn the ignition off.
Disconnect the ECM harness connectors.
Remove the ASD Relay from the TIPM.
Using a jumper wire, connect ASD Relay connector cavities 30 and 87 in the TIPM.
Turn the ignition on.
Measure the voltage of the (T752) Starter Relay Control circuit.
Is the voltage above 1.0 volt?
Yes
No
10.
(T752) STARTER RELAY CONTROL CIRCUIT OPEN
Turn the ignition off.
Remove the jumper wire and install the ASD Relay.
Measure the resistance of the (T752) Starter Relay Control circuit between the ECM harness connector and the Starter Relay connector in the TIPM.
Is the resistance below 10.0 ohms?
Yes
No
-
Repair the (T752) Starter Relay Control circuit for an open.
11.
FUSED B(+) CIRCUIT OPEN
Using a 12-volt test light connected to ground, check the Fused B(+)circuit in the Starter Relay connector in the TIPM.
Is the test light on?
Yes
No
12.
(T750) STARTER RELAY OUTPUT CIRCUIT OPEN
Disconnect the (T750) Starter Relay Output wire from the Starter Solenoid.
Connect the (T750) Starter Relay 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 Starter Relay connector in the TIPM.
Does the test light illuminate brightly?
Yes
No
13.
MECHANICAL PROBLEM
Turn the ignition off.
Attempt to manually rotate the crankshaft 360 degrees .
Is the crankshaft able to rotate 360 degrees ?
Yes
No