Jeep XJ. Manual — part 865
TEST
ACTION
APPLICABILITY
5
If there are no possible causes remaining, view repair.
All
Repair
Replace the Powertrain Control Module.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
221
SPEED CONTROL
*BRAKE SWITCH SENSE STATUS DOES NOT CHANGE ON DRB —
Continued
Symptom:
*CHECKING SPEED CONTROL OPERATION WITH NO DTC’S
PRESENT
POSSIBLE CAUSES
S/C SW SIGNAL CIRCUIT TO CLOCKSPRING CONNECTOR OPEN
GROUND CIRCUIT AT S/C SERVO CONNECTOR OPEN
GROUND CIRCUIT TO S/C RESUME/ACCEL SWITCH CONNECTOR OPEN
DRBIII
t DOES NOT SHOW SET SWITCH 9PRESSED9 OR RELEASED
S/C WIRING HARNESS OBSERVABLE PROBLEM
CANCEL SWITCH
COAST SWITCH
THROTTLE CABLE OBSERVABLE PROBLEM
THROTTLE OPENS AND CLOSES
SPEED CONTROL ON/OFF SWITCH STUCK
SPEED CONTROL RESUME/ACCEL SWITCH
SPEED CONTROL RESUME/ACCEL SWITCH STUCK
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t in Inputs/Outputs, read the Speed Control Switch state.
While observing the display, press the Brake Pedal several times.
Does the DRBIII
t show Brake Switch 9pressed9 and 9released9?
All
Yes
→
No
→
2
Turn the ignition on.
With the DRBIII
t in Inputs/Outputs, read the Speed Control Switch state.
While observing the display, press the On/Off Switch several times.
Does the DRBIII
t show On/Off Switch 9pressed9 and 9released9?
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
→
222
SPEED CONTROL
TEST
ACTION
APPLICABILITY
4
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.
5
Turn the ignition on.
With the DRBIII
t in Inputs/Outputs, read the P/N Switch state.
While observing the display, move the Gear Selector to DRIVE.
Does the DRBIII
t show P/N switch 9D/R9?
All
Yes
→
No
→
6
Turn the ignition off.
Inspect the throttle cable and linkage for any binding or damage.
Is the cable or linkage disconnected or damaged?
All
Yes
→
Repair as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
No
→
7
Turn the ignition on.
With the DRBIII
t in Inputs/Outputs, read the Speed Control Set Switch state.
While observing the display, press the Set Switch several times.
Does the DRBIII
t show the Set Switch status change appropriately from Pressed to
Released?
All
Yes
→
No
→
Replace the Left S/C Switch.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
8
Turn the ignition on.
With the DRBIII
t in Inputs/Outputs, read the Speed Control Resume Switch state.
While observing the display, press the Resume Switch several times.
Does the DRBIII
t show the Resume Switch status change appropriately from
Pressed to Released?
All
Yes
→
No
→
9
Turn the ignition on.
With the DRBIII
t in Inputs/Outputs, read the Speed Control Cancel Switch state.
While observing the display, press the Cancel Switch several times.
Does the DRBIII
t show the Cancel Switch status change appropriately from Pressed
to Released?
All
Yes
→
No
→
Replace the Right S/C Switch.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
223
SPEED CONTROL
*CHECKING SPEED CONTROL OPERATION WITH NO DTC’S PRESENT
—
Continued
TEST
ACTION
APPLICABILITY
10
Turn the ignition on.
With the DRBIII
t read DTC’s.
Are any Vehicle Speed Signal codes set?
All
Yes
→
No
→
11
Turn the ignition on.
With the DRBIII
t in Inputs/Outputs, read the Speed Control Coast Switch state.
While observing the display, press the Coast Switch several times.
Does the DRBIII
t show the Coast Switch status change appropriately from Pressed
to Released?
All
Yes
→
No
→
Replace the Right S/C Switch.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
12
Turn the ignition off.
Disconnect the Speed Control Resume/Accel Switch harness connector.
Turn the ignition on.
With the DRBIII
t, read the Speed Control Switch Voltage.
Did the DRBIII
t show Speed Control Switch Voltage go from below 4.2 Volts to above
4.2 Volts?
All
Yes
→
Replace the Right Speed Control Switch.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
No
→
13
Turn the ignition on.
With the DRBIII
t read DTC’s.
Are any Vehicle Speed Signal codes set?
All
Yes
→
No
→
14
Start the engine.
Allow engine to idle for 1 minute.
Turn the engine off, then turn the ignition on, engine not running.
With the DRBIII
t, actuate the Speed Control Servo Solenoids.
Does the Throttle open and close?
All
Yes
→
No
→
Perform Speed Control Vacuum Supply Test per appropriate
service procedure.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
224
SPEED CONTROL
*CHECKING SPEED CONTROL OPERATION WITH NO DTC’S PRESENT
—
Continued
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