Jeep Liberty KJ. Manual — part 761
•
When Monitored:
With the ignition on and the ECM Starter Relay command on.
•
Set Condition:
The ECM detects excessive current on the Starter Relay Control circuit for 0.2 seconds.
Possible Causes
INTERMITTENT CONDITION
STARTER RELAY
IGNITION SWITCH START OUTPUT OPEN
STARTER RELAY CONTROL CIRCUIT OPEN
STARTER RELAY CONTROL CIRCUIT SHORTED TO GROUND
STARTER RELAY CONTROL CIRCUIT SHORTED TO VOLTAGE
ENGINE CONTROL MODULE
Diagnostic Test
1.
CLEAR CODE AND CHECK IF THE DTC RESETS
NOTE: If the ECM detects and stores a DTC, the ECM also stores the engine/vehicle operating conditions
under which the DTC was set. Some of these conditions are displayed on the scan tool at the same time the
DTC is displayed.
NOTE: Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may
assist when checking for an active DTC.
Turn the ignition on.
With the scan tool, erase ECM DTCs.
Attempt to start the engine several times, pausing for at least 10 seconds between each attempt.
Turn the ignition on.
With the scan tool, read ECM DTCs.
Did this DTC set again?
Yes
>> Go To 2
No
>> Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
2.
STARTER RELAY
Turn the ignition off.
Install a substitute relay in place of the Starter Relay.
Turn the ignition on.
With the scan tool, erase DTCs.
Attempt to start the engine several times, pausing for at least 10 seconds between each attempt.
Turn the ignition on.
With the scan tool, read ECM DTCs.
Did this DTC set again?
Yes
>> Go To 3
No
>> Replace the Starter Relay.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
9 - 1102
ENGINE DIESEL DIAG
KJ
3.
IGNITION SWITCH START OUTPUT CIRCUIT OPEN
Turn the ignition off.
Remove the Starter Relay from the PDC.
Disconnect the ECM harness connectors.
Turn the Ignition Switch to the Start position.
Using a 12-volt test light connected to ground, check the Ignition Switch
Start Output circuit at the Starter Relay connector in the PDC.
Using a 12-volt test light connected to ground, check the Ignition Switch
Start Output circuit at the ECM C2 harness connector cavity 22.
Does the test light illuminate brightly for both circuit checks?
Yes
>> Go To 4
No
>> Repair the Ignition Switch Start Output circuit for an open.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
4.
STARTER RELAY CONTROL CIRCUIT OPEN
Turn the ignition off.
Remove the Starter Relay from the PDC.
Disconnect the ECM harness connectors.
Measure the resistance of the Starter Relay Control circuit between the
ECM harness connector and the PDC connector.
Is the resistance below 10.0 ohms?
Yes
>> Go To 5
No
>> Repair the Starter Relay Control circuit for an open.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
KJ
ENGINE DIESEL DIAG
9 - 1103
5.
STARTER RELAY CONTROL CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Remove the Starter Relay from the PDC.
Disconnect the ECM harness connectors.
Measure the resistance between ground and the Starter Relay Control
circuit.
Is the resistance above 1000 ohms?
Yes
>> Go To 6
No
>> Repair the Starter Relay Control circuit for a short to
ground.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
6.
STARTER RELAY CONTROL CIRCUIT SHORTED TO VOLTAGE
Turn the ignition off.
Remove the Starter Relay.
Disconnect the ECM harness connectors.
Remove the ASD Relay from the PDC.
Connect a jumper wire between cavity 30 and cavity 87 of the ASD
Relay connector.
Turn the ignition on.
Measure the voltage of the Starter Relay Control circuit.
Is the voltage below 1.0 volt?
Yes
>> Replace and program the Engine Control Module in accor-
dance with the Service Information.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
No
>> Repair the Starter Relay Control circuit for a short to volt-
age.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
9 - 1104
ENGINE DIESEL DIAG
KJ
P0615-STARTER RELAY CIRCUIT OPEN CIRCUIT
For a complete wiring diagram Refer to Section 8W
KJ
ENGINE DIESEL DIAG
9 - 1105
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