Jeep Liberty KJ. Manual — part 611
5.
EXCESSIVE RESISTANCE IN THE SENSOR GROUND CIRCUIT
NOTE: On ESP equipped vehicles the AAT Sensor ground circuit is
at the C2 BCM harness connector.
Measure the resistance of the Sensor ground circuit from the Sensor
harness connector to the appropriate terminal of special tool #8815 or
the C2 BCM harness connector on ESP vehicles.
Is the resistance above 5.0 ohms.
Yes
>> Repair the excessive resistance in the Sensor ground cir-
cuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 6
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ENGINE ELECTRICAL DIAGNOSTICS
KJ
6.
PCM
NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal
push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and
Ground circuits.
Were there any problems found?
Yes
>> Repair as necessary.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Replace and program the Powertrain Control Module per Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
KJ
ENGINE ELECTRICAL DIAGNOSTICS
9 - 503
P1593-SPEED CONTROL SWITCH 1 STUCK
For a complete wiring diagram Refer to Section 8W.
9 - 504
ENGINE ELECTRICAL DIAGNOSTICS
KJ
•
When Monitored:
Ignition on.
•
Set Condition:
S/C Switch No.1 is mechanically stuck in the On/Off, Resume/Accel, or Set position for too long. One trip fault.
Possible Causes
(V37) S/C SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
(V37) S/C SIGNAL CIRCUIT OPEN
(K900) SENSOR GROUND OPEN
(V37) S/C SIGNAL CIRCUIT SHORTED TO GROUND
(V37) S/C SIGNAL CIRCUIT SHORTED TO THE (K900) SENSOR GROUND
SPEED CONTROL SWITCH
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).
Diagnostic Test
1.
SPEED CONTROL SWITCH STATUS
Start the engine.
With a scan tool, monitor each which function for the Speed Control Switches.
Press and release each Speed Control Button.
- Resume/Accel
- Cancel
- Decel (Coast)
- On/Off
- Set
Does each switch function change status when pressing each switch?
Yes
>> Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 2
2.
SPEED CONTROL SWITCHES
Turn the ignition off.
Disconnect and remove the Speed Control Switches from the steering wheel per Service Information.
Measure the resistance across each Speed Control Switch.
Monitor the ohmmeter while pressing each function button on each switch.
Resume/Accel - 15.4 kohms
Cancel - 1.24 kohms
Coast - 2.94 kohms
On/Off -0.47 kohms
Set - 5.49 kohms
Does the function on the Speed Control Switches have the correct resistance value?
Yes
>> Go To 3
No
>> Replace the Speed Control Switch that had the incorrect resistance value.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
KJ
ENGINE ELECTRICAL DIAGNOSTICS
9 - 505
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