Jeep XJ. Manual — part 862
TEST
ACTION
APPLICABILITY
11
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.
12
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
→
13
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
→
14
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.
209
SPEED CONTROL
P1595-SPEED CONTROL SOLENOID CIRCUITS —
Continued
TEST
ACTION
APPLICABILITY
15
Turn the ignition off.
Disconnect the Speed Control Servo harness connector.
Disconnect PCM harness connectors.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance of the S/C Vacuum Solenoid Control Circuit from the PCM
harness connector to the Servo harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the open S/C Vacuum Solenoid Control Circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
16
Turn the ignition off.
Disconnect the Speed Control Servo harness connector.
Disconnect the PCM harness connector(s).
Note: Check connectors - Clean/repair as necessary.
Measure the resistance of the S/C Vacuum Solenoid Control Circuit from the Servo
harness connector to a good ground.
Is the resistance below 5.0 ohms?
All
Yes
→
Repair the short to ground in the S/C Vacuum Solenoid Control
Circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
No
→
17
If there are no possible causes remaining, replace the Speed Control Servo.
View repair options.
All
Repair
Replace the S/C Servo.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
18
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.
19
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.
210
SPEED CONTROL
P1595-SPEED CONTROL SOLENOID CIRCUITS —
Continued
TEST
ACTION
APPLICABILITY
20
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
→
21
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.
22
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
→
23
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
→
211
SPEED CONTROL
P1595-SPEED CONTROL SOLENOID CIRCUITS —
Continued
TEST
ACTION
APPLICABILITY
24
Turn the ignition off.
Disconnect the Speed Control Servo 4-way harness connector.
Note: Check connectors - Clean/repair as necessary.
Note: Ensure the Brake Pedal is not depressed during the following steps.
Turn the ignition on.
Turn the S/C Switch on.
With the DRBIII
t, actuate the S/C Vacuum Solenoid.
Using a 12-volt Test Light, check the S/C Brake Switch Output Circuit at the Servo
harness connector.
Is the light illuminated and bright?
All
Yes
→
No
→
25
Turn the ignition off.
Disconnect the Speed Control Servo harness connector.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance of the Ground Circuit at the Servo harness connector to
ground.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair open Ground Circuit at S/C Servo Connector.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
26
Turn the ignition off.
Disconnect the Speed Control Servo harness Connector.
Disconnect the PCM harness connector(s).
Note: Check connectors - Clean/repair as necessary.
Measure the resistance of the S/C Vent Solenoid Control Circuit from the PCM
harness connector to the Servo harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the open S/C Vent Solenoid Control Circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
27
Turn the ignition off.
Disconnect the S/C Servo harness connector.
Disconnect the PCM harness connector(s).
Note: Check connectors - Clean/repair as necessary.
Measure the resistance of the S/C Vent Solenoid Control Circuit from the Servo
harness connector to a good Ground.
Is the resistance below 5.0 ohms?
All
Yes
→
Repair the short to ground in the S/C Vent Solenoid Control
Circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
No
→
28
If there are no possible causes remaining, replace the Speed Control Servo.
View repair options.
All
Repair
Replace the S/C Servo.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
212
SPEED CONTROL
P1595-SPEED CONTROL SOLENOID CIRCUITS —
Continued
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