Jeep Liberty KJ. Manual — part 642
3.
EXCESSIVE RESISTANCE IN THE BATTERY CIRCUIT
Turn the ignition off.
Check the Battery Cables for excessive resistance using the service information procedure.
Did either Battery Cable have a voltage drop greater than 0.2 of a volt?
Yes
>> Repair the excessive resistance in the Battery circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 4
4.
STARTER RELAY
Turn ignition off.
Remove the Starter Relay from PDC.
Install a known good Relay.
Will the Starter Motor crank with the new relay?
Yes
>> Replace the Starter Relay.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 5
5.
INTERNAL FUSED IGNITION SWITCH OUTPUT CIRCUIT
Turn the ignition off.
Remove the Starter Relay from the PDC.
Ignition on, engine not running.
Using a 12-volt test light, probe the Internal Fused Ignition Switch Out-
put circuit in the Starter Relay connector.
While observing 12-volt test light, hold ignition key in the start position.
Does the test light illuminate brightly?
Yes
>> Go To 6
No
>> Repair the excessive resistance in the (F924) Fused Ignition
Switch Output circuit. Inspect related fuses and repair as
necessary.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
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ENGINE ELECTRICAL DIAGNOSTICS
KJ
6.
(T752) STARTER RELAY CONTROL CIRCUIT OPEN
Turn the ignition off.
Remove the Starter Relay from the PDC.
Disconnect the C3 PCM harness connector.
Measure the resistance in the (T752) Starter Relay Control circuit from
the Relay terminal to the appropriate terminals of special tool #8815.
Is the resistance below 5.0 ohms?
Yes
>> Go To 7
No
>> Repair the open in the (T752) Starter Relay Control circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
7.
INTERNAL FUSED B+ CIRCUIT OPEN
Turn the ignition off.
Using a 12-volt test light connected to ground, probe the Internal Fused
B+ circuit at the Starter Relay terminal.
Does the test light illuminate brightly?
Yes
>> Go To 8
No
>> Repair the excessive resistance in the Internal Fused B+
circuit. Inspect related fuses and repair as necessary.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
8.
(T750) STARTER RELAY OUTPUT CIRCUIT OPEN
Disconnect the Starter Relay Output connector from the Starter Sole-
noid.
Measure the resistance of the (T750) Starter Relay Output circuit
between the Relay and the Solenoid harness connector.
Is the resistance below 5.0 ohms?
Yes
>> Go To 9
No
>> Repair the open in the (T750) Starter Relay Output circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
KJ
ENGINE ELECTRICAL DIAGNOSTICS
9 - 627
9.
STARTER
If there are no other possible causes remaining, review repair.
Repair
Replace the Starter.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
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ENGINE ELECTRICAL DIAGNOSTICS
KJ
*NO RESPONSE WITH A NO START CONDITION
For a complete wiring diagram Refer to Section 8W.
KJ
ENGINE ELECTRICAL DIAGNOSTICS
9 - 629
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