Jeep XJ. Manual — part 644
Symptom:
*NO CRANK CONDITION
POSSIBLE CAUSES
BATTERY CABLE HIGH RESISTANCE
CHECKING SHIFTER LINKAGE
CLUTCH INTERLOCK SWITCH
CLUTCH INTERLOCK SWITCH SENSE CKT OPEN
INSPECT BATTERY CABLES
MECHANICAL PROBLEM
OPEN FUSED BATTERY (+) CIRCUIT
OPEN IGNITION SWITCH START OUTPUT
STARTER MOTOR
STARTER RELAY
STARTER RELAY OUTPUT CIRCUIT OPEN
TEST
ACTION
APPLICABILITY
1
NOTE: The Clutch Pedal must be depressed during any engine start
attempt.
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?
All
Yes
→
Repair as necessary.
Perform NO START VERIFICATION - VER-1.
No
→
2
Remove the Starter Relay from the PDC.
Using a 12-volt test light connected to ground, check the Fused B+ circuit.
Is the test light on?
All
Yes
→
No
→
Repair the Fused B(+) circuit for an open.
Perform NO START VERIFICATION - VER-1.
3
Remove the Starter Relay from the PDC.
Using a 12-volt test light connected to ground, check the Ignition Switch Start
Output circuit while turning the ignition switch to the crank position.
Does the test light illuminate with the ignition switch in the crank position?
All
Yes
→
No
→
Repair the Ignition Switch Start Output circuit.
Perform NO START VERIFICATION - VER-1.
228
STARTING
TEST
ACTION
APPLICABILITY
4
WARNING: The transmission must be in Neutral and the parking break
must be engaged for this test.
WARNING: The engine may be cranked in this test. Keep away from moving
engine parts.
Briefly connect a jumper wire between the Starter Relay Output circuit and the
Fused B+ circuit at the starter relay connector in the PDC.
Did the engine crank?
All
Yes
→
No
→
5
Turn the ignition off.
Remove the Starter Relay From the PDC.
Install a substitute relay in place of the Starter Relay.
Attempt to start the engine.
Does the engine crank?
All
Yes
→
Replace the Starter Relay.
Perform NO START VERIFICATION - VER-1.
No
→
6
Turn the ignition off.
Disconnect the Clutch Interlock Switch harness connector.
Connect a jumper wire between the Clutch Interlock Switch Sense circuit and
ground.
Attempt to start the engine.
Does the engine crank?
All
Yes
→
Repair the Clutch Interlock Switch Sense circuit for an open.
Perform NO START VERIFICATION - VER-1.
No
→
7
Check the shifter and associated linkage for proper adjustment between shifter and
transmission.
Were any problems found?
All
Yes
→
Repair or replace as necessary.
Perform NO START VERIFICATION - VER-1.
No
→
Replace the Clutch Interlock Switch in accordance with the
Service Information.
Perform NO START VERIFICATION - VER-1.
8
Turn the ignition off.
Remove the Starter Relay from the PDC.
Disconnect the Starter Relay Output wire from the Starter Solenoid.
Measure the resistance of the Starter Relay Output circuit between the PDC and the
Starter Solenoid.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the Starter Relay Output circuit for an open.
Perform NO START VERIFICATION - VER-1.
229
STARTING
*NO CRANK CONDITION —
Continued
TEST
ACTION
APPLICABILITY
9
Using the Service Information, check the battery cables for high resistance.
Did either battery cable have a voltage drop greater than 0.2 volts?
All
Yes
→
Replace the battery cable(s).
Perform NO START VERIFICATION - VER-1.
No
→
10
Turn the ignition off.
Attempt to manually rotate the crankshaft 360°.
Is the crankshaft able to rotate 360°?
All
Yes
→
Replace the Starter Motor.
Perform NO START VERIFICATION - VER-1.
No
→
Repair the engine mechanical problem.
Perform NO START VERIFICATION - VER-1.
230
STARTING
*NO CRANK CONDITION —
Continued
Symptom:
*NO START CONDITION
POSSIBLE CAUSES
CHECKING FUEL QUANTITY ACTUATOR
ECM - IMMOBILIZER SIGNAL
ECM - IMMOBILIZER SIGNAL OUTPUT
FUEL INJECTION PUMP TIMING
FUEL QUANTITY ACTUATOR CIRCUIT SHORT TO VOLTAGE
FUEL SUPPLY CONTAMINATION
FUEL SYSTEM PRESSURE
FUEL SYSTEM RESTRICTION
IMMOBILIZER SIGNAL CIRCUIT OPEN
IMMOBILIZER SIGNAL CIRCUIT SHORTED TO GROUND
IMMOBILIZER SIGNAL CIRCUIT SHORTED TO VOLTAGE
VERIFYING IMMOBILIZER SIGNAL
TEST
ACTION
APPLICABILITY
1
NOTE: Check for SKIM, ECM, and PCM DTCs. Return to the Symptom List
to diagnose any DTCs that are present before continuing.
With the DRB, select Engine (JTEC), Miscellaneous and View SKIM Status.
While observing the DRB, attempt to start the engine.
Does the DRB display Fuel Shut-Off Activated?
All
Yes
→
No
→
2
Turn the ignition off.
Disconnect the PCM harness connector.
Disconnect the ECM harness connector.
Remove the ASD Relay from the PDC.
Connect a jumper wire between ASD Relay connector cavity 30 and cavity 87 in the
PDC.
Turn the ignition on.
Measure the voltage of the Immobilizer Signal circuit.
Is the voltage above 1.0 volt?
All
Yes
→
Repair the Immobilizer Signal circuit for a short to voltage.
Perform NO START VERIFICATION - VER-1.
No
→
231
STARTING
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