Jeep XJ. Manual — part 864
TEST
ACTION
APPLICABILITY
7
Turn the ignition off.
Disconnect the Speed Control On/Off Switch 2-way harness connector only.
Note: Check connectors - Clean/repair as necessary.
Turn the ignition on.
Measure the S/C Switch Signal Circuit for voltage at the On/Off Switch 2-way
connector.
Is the voltage above 6.0 volts?
All
Yes
→
Repair the Speed Control Switch Signal Circuit for a short to
voltage.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
No
→
8
Turn the ignition off.
Disconnect the Clockspring 6-way harness connector (instrument panel harness side)
.
Disconnect the PCM harness connector.
Note: Check connectors - Clean/repair as necessary.
Using an Ohmmeter, measure the resistance of the S/C Switch Signal Circuit from
the PCM to the Clockspring Connector.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair open Speed Control Switch Signal Circuit PCM to Clock-
spring.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
9
Turn the ignition off.
Disconnect the On/Off switch 2-way harness connector.
Disconnect the upper clockspring harness connector.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance of the S/C Switch Signal Circuit from the clockspring harness
connector to the On/Off switch harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the open Speed Control Switch Signal Circuit Clockspring
to S/C switch.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
10
If there are no possible causes remaining, replace the Powertrain Control Module.
View repair options.
All
Repair
Replace Powertrain Control Module.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
217
SPEED CONTROL
P1596-SPEED CONTROL SWITCH ALWAYS HIGH —
Continued
Symptom:
P1597-SPEED CONTROL SWITCH ALWAYS LOW
When Monitored and Set Condition:
P1597-SPEED CONTROL SWITCH ALWAYS LOW
When Monitored:
With the ignition key on and battery voltage above 10.4 volts.
Set Condition:
When switch voltage is less than 0.39 volts for 2 minutes.
POSSIBLE CAUSES
CLOCKSPRING SHORTED TO GROUND
S/C WIRING HARNESS OBSERVABLE PROBLEM
S/C SWITCH (ON/OFF)
S/C SWITCH (RESUME/ACCEL)
S/C SIGNAL CIRCUIT SHORTED TO SENSOR GROUND
S/C SWITCH SIGNAL CIRCUIT SHORTED TO GROUND
PCM
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, read the S/C Switch volts status.
Is the S/C Switch voltage below 1.0 volt?
All
Yes
→
No
→
2
Turn the ignition off.
Disconnect the S/C ON/OFF Switch harness connector.
Note: Check connectors - Clean/repair as necessary.
Turn the ignition on.
With the DRBIII
t in Sensors, read the S/C Switch volts.
Did the S/C Switch volts change to 5.0 volts?
All
Yes
→
Replace the S/C ON/OFF Switch.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
No
→
3
Turn the ignition off.
Disconnect the S/C RESUME/ACCEL Switch harness connector.
Note: Check connectors - Clean/repair as necessary.
Ignition on, engine not running.
With the DRBIII
t in Sensors, read the S/C Switch volts.
Did the S/C Switch volts go above 4.0 volts?
All
Yes
→
Replace the Resume/Accel Switch.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
No
→
218
SPEED CONTROL
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Disconnect the clockspring 6-way harness connector (instrument panel wiring side).
Turn the ignition on.
With the DRBIII
t in Sensors, read the S/C Switch volts.
Did the S/C Switch volts change to 5.0 volts?
All
Yes
→
Replace the Clockspring.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
No
→
5
Turn the ignition off.
Disconnect the S/C ON/OFF Switch harness connector.
Disconnect the PCM harness connectors.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance between the S/C Signal Circuit and the Sensor Ground
Circuit at the ON/OFF switch harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→
Repair S/C Signal Circuit shorted to Sensor Ground.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
No
→
6
Turn the ignition off.
Disconnect the S/C ON/OFF Switch harness connector.
Disconnect the PCM harness connectors.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance between the S/C Switch Signal circuit and ground (B-) at S/C
ON/OFF Switch harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→
Repair S/C Switch Signal Circuit for a short to ground.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
No
→
7
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.
8
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.
219
SPEED CONTROL
P1597-SPEED CONTROL SWITCH ALWAYS LOW —
Continued
Symptom:
*BRAKE SWITCH SENSE STATUS DOES NOT CHANGE ON DRB
POSSIBLE CAUSES
BRAKE LAMP SWITCH GROUND CIRCUIT OPEN
BRAKE LAMP SWITCH SENSE CIRCUIT OPEN
BRAKE LAMP SWITCH SENSE CIRCUIT SHORT TO GROUND
BRAKE SWITCH (SENSE CKT)
POWERTRAIN CONTROL MODULE (BRAKE SENSE)
TEST
ACTION
APPLICABILITY
1
Turn the ignition off.
Disconnect the Brake Lamp Switch harness connector.
Measure the resistance between ground and the Brake Lamp Switch Ground circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the Brake Lamp Switch Ground circuit for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
2
Turn the ignition off.
Disconnect the Brake Lamp Switch harness connector.
Disconnect the PCM harness connectors.
Measure the resistance of the Brake Lamp Switch Sense circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the Brake Lamp Switch Sense circuit for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
3
Turn the ignition off.
Disconnect the Brake Lamp Switch harness connector.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance between the Brake Lamp Switch Sense terminal and the
Ground terminal (measurement taken across switch).
Apply and release the Brake Pedal while monitoring the ohmmeter.
Does the resistance change from below 5.0 ohms to open circuit?
All
Yes
→
No
→
Replace the Brake Switch.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
4
Turn the ignition off.
Disconnect the Brake Lamp Switch harness connector.
Disconnect the PCM harness connectors.
Disconnect the CAB harness connector.
Measure the resistance between ground and the Brake Lamp Switch Sense circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
Repair the Brake Lamp Switch Sense circuit for a short to ground.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
No
→
220
SPEED CONTROL
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