Jeep XJ. Manual — part 861
TEST
ACTION
APPLICABILITY
22
Turn the ignition off.
Remove the A/C Clutch Relay.
Note: Check connectors - Clean/repair as necessary.
Measure the Fused B(+) at the Relay.
Is the voltage above 11.0 volts?
All
Yes
→
No
→
Repair the open Fused B(+) Circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
23
If there are no possible causes remaining, view repair.
All
Repair
Repair the open A/C Request Circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
205
HEATING & A/C
*CHECKING A/C SYSTEM OPERATION WITH NO DTC’S —
Continued
Symptom List:
P1595-SPEED CONTROL SOLENOID CIRCUITS
P1683-SPD CTRL PWR RELAY; OR S/C 12V DRIVER CKT
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P1595-SPEED CONTROL SOLE-
NOID CIRCUITS.
When Monitored and Set Condition:
P1595-SPEED CONTROL SOLENOID CIRCUITS
When Monitored:
With the ignition key on, the speed control switched on, the SET switch
pressed and the vehicle in drive gear moving above 35 MPH.
Set Condition:
The powertrain control module actuates the vacuum and vent solenoids
but they do not respond.
P1683-SPD CTRL PWR RELAY; OR S/C 12V DRIVER CKT
When Monitored:
With the ignition key on and the speed control switched on.
Set Condition:
The speed control power supply circuit is either open or shorted to ground.
POSSIBLE CAUSES
S/C POWER SUPPLY CIRCUIT SHORTED TO GROUND
GROUND CIRCUIT AT S/C SERVO CONNECTOR OPEN
S/C WIRING HARNESS INTERMITTENT PROBLEM (S/C VENT SOL AC)
S/C VACUUM SOLENOID CONTROL CIRCUIT OPEN
S/C VACUUM SOLENOID CONTROL CKT SHORT TO GROUND
S/C VENT SOLENOID CONTROL CIRCUIT OPEN
S/C VENT SOLENOID CONTROL CKT SHORT TO GROUND
S/C WIRING HARNESS INTERMITTENT PROBLEM (S/C VAC SOL AC)
S/C WIRING HARNESS OBSERVABLE PROBLEM
S/C SERVO (12V DRIVER CIRCUIT)
S/C SERVO (12V DRIVER CIRCUIT)
S/C POWER SUPPLY CIRCUIT OPEN
BRAKE SWITCH
BRAKE SWITCH OUT OF ADJUSTMENT
S/C BRAKE SWITCH OUTPUT CIRCUIT OPEN
S/C BRAKE SWITCH OUTPUT CIRCUIT SHORTED TO GROUND
PCM (12V DRIVER CIRCUIT)
206
SPEED CONTROL
TEST
ACTION
APPLICABILITY
1
Ignition On, Engine Not Running.
With the DRBIII
t actuate the S/C Vent Solenoid.
Does the Speed Control Servo click?
All
Yes
→
No
→
2
Turn the ignition on.
With the DRBIII
t, actuate the S/C Vacuum Solenoid.
Does the Speed Control Servo click?
All
Yes
→
No
→
3
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
→
4
Turn the ignition on.
With the DRBIII
t, actuate the S/C Vent Solenoid..
Wiggle the Wiring Harness from S/C Servo and Brake Switch to Powertrain Control
Module.
Did the wiggling interrupt the S/C Servo actuation?
All
Yes
→
Repair as necessary where wiggling caused the actuation to be
interrupted.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
No
→
5
Turn the ignition on.
With the DRBIII
t, actuate the S/C Vacuum Solenoid.
Wiggle the Wiring Harness from S/C Servo and Brake Switch to Powertrain Control
Module.
Did the wiggling interrupt the S/C actuation?
All
Yes
→
Repair as necessary where wiggling caused the actuation to be
interrupted.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
No
→
Test Complete.
6
Turn the ignition on.
With the DRBIII
t, actuate the S/C Vent Solenoid..
Wiggle the Wiring Harness from S/C Servo and Brake Switch to Powertrain Control
Module.
Did the wiggling interrupt the S/C Servo actuation?
All
Yes
→
Repair as necessary where wiggling caused the actuation to be
interrupted.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
No
→
207
SPEED CONTROL
P1595-SPEED CONTROL SOLENOID CIRCUITS —
Continued
TEST
ACTION
APPLICABILITY
7
Turn the ignition off.
Disconnect the Speed Control Servo 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 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
→
8
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.
9
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
→
10
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.
208
SPEED CONTROL
P1595-SPEED CONTROL SOLENOID CIRCUITS —
Continued
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