Jeep XJ. Manual — part 863
TEST
ACTION
APPLICABILITY
29
Turn ignition off.
Using Service Procedure, check Brake Switch adjustment.
Was Brake Switch adjustment OK?
All
Yes
→
No
→
Adjust Brake Switch.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
30
Turn the ignition off.
Disconnect the Brake Switch harness connector.
Note: Check connectors - Clean/repair as necessary.
Be sure the brake pedal is not depressed during the next step.
Measure the resistance between the S/C power supply circuit and the S/C brake
switch output circuit (measurement taken across switch).
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Replace the Brake Switch.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
31
Turn the ignition off.
Disconnect the Brake Switch harness connector.
Disconnect the PCM harness connector(s).
Note: Check connectors - Clean/repair as necessary.
Measure the resistance of the S/C Power Supply Circuit from the PCM harness
connector to the Brake Switch harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the open S/C Power Supply Circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
32
Turn the ignition off.
Disconnect the Speed Control Servo harness connector.
Disconnect the Brake Lamp Switch harness connector.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance between ground and the S/C Brake Switch Output circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
Repair Switched S/C Brake Switch Output circuit shorted to
ground.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
No
→
33
Turn the ignition off.
Disconnect the S/C Servo harness connector.
Disconnect the Brake Switch harness connector.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance of the S/C Brake Switch Output Circuit from the Brake
Switch harness Connector to the Servo harness Connector.
Is the resistance above 5.0 ohms?
All
Yes
→
Repair the open S/C Brake Switch Output Circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
No
→
213
SPEED CONTROL
P1595-SPEED CONTROL SOLENOID CIRCUITS —
Continued
TEST
ACTION
APPLICABILITY
34
Turn the ignition off.
Disconnect the Brake Switch harness connector.
Disconnect the PCM harness connector(s).
Note: Check connectors - Clean/repair as necessary.
Measure the resistance between the S/C Power Supply Circuit and ground at the
Brake Switch harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→
Repair S/C Power Supply Circuit shorted to ground.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
No
→
35
If there are no possible causes remaining, replace the Powertrain Control Module.
View repair options.
All
Repair
Replace the Powertrain Control Module.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
214
SPEED CONTROL
P1595-SPEED CONTROL SOLENOID CIRCUITS —
Continued
Symptom:
P1596-SPEED CONTROL SWITCH ALWAYS HIGH
When Monitored and Set Condition:
P1596-SPEED CONTROL SWITCH ALWAYS HIGH
When Monitored:
With the ignition key on.
Set Condition:
An open circuit is detected in the speed control on/off switch circuit. The
circuit must be above 4.8 volts for more than 2 minutes to set the DTC.
POSSIBLE CAUSES
SPEED CONTROL SWITCH GROUND CIRCUIT OPEN CLOCKSPRING TO S/C SWITCH
SPEED CONTROL SWITCH GROUND CIRCUIT OPEN PCM TO CLOCKSPRING
CLOCKSPRING SIGNAL/GROUND CIRCUIT OPEN
S/C WIRING HARNESS OBSERVABLE PROBLEM
SPEED CONTROL ON/OFF SWITCH
SPEED CONTROL SW SIG CKT OPEN PCM TO CLOCK SPRING
SPEED CONTROL SW SIG CKT OPEN CLOCKSPRING TO S/C SWITCH
SPEED CONTROL SWITCH SIGNAL CKT SHORTED TO VOLTAGE
POWERTRAIN CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t in Inputs/Outputs, read the Speed Control inputs state.
While monitoring the DRBIII
t, push the Speed Control On/Off Switch several times,
then leave it on.
Did the DRBIII
t show Speed Control Switch off and on?
All
Yes
→
No
→
2
Turn the ignition off.
Using the Schematics as a guide, inspect the Wiring and Connectors.
Were any problems found?
All
Yes
→
Repair as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
No
→
Test Complete.
215
SPEED CONTROL
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the Speed Control On/Off Switch 2-way harness connector.
Disconnect the clockspring 6-way harness connector (S/C switch side)
Note: Check connectors - Clean/repair as necessary.
Measure the resistance of the S/C Switch Sensor Ground Circuit from the On/Off
Switch 2-way harness connector to the clockspring harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair open ground circuit from clockspring to S/C switch.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
4
Turn the ignition off.
Disconnect the clockspring 6-way harness connector (instrument panel harness side).
Disconnect the PCM harness connector(s).
Note: Check connectors - Clean/repair as necessary.
Measure the resistance of the S/C Switch Sensor Ground Circuit from the PCM
harness connector to the clockspring harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair open ground circuit from PCM to clockspring.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
5
Turn the ignition off.
Disconnect the Speed Control On/Off Switch 2-way harness connector only.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance across the S/C On/Off Switch.
Is the resistance between 20.3K and 20.7K ohms?
All
Yes
→
No
→
Replace the On/Off Switch.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
6
Turn the ignition off.
Disconnect the upper and lower 6-way clockspring harness connectors.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance of the K4 sensor ground circuit between the upper and lower
6-way clockspring harness connectors.
Measure the resistance of the V37 speed control switch signal circuit between the
upper and lower 6-way clockspring harness connectors.
Was the resistance above 5.0 ohms for either circuit?
All
Yes
→
Replace the clockspring.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
No
→
216
SPEED CONTROL
P1596-SPEED CONTROL SWITCH ALWAYS HIGH —
Continued
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