Jeep XJ. Manual — part 643
TEST
ACTION
APPLICABILITY
7
Turn the ignition on.
With the DRB, select Engine, JTEC then Actuators.
With the DRB, actuate the S/C Lamp while observing the S/C Lamp.
Is the S/C Lamp turning on and off during actuation?
All
Yes
→
No
→
Refer to symptom list for problems related to S/C Lamp operation.
Perform SPEED CONTROL VERIFICATION - VER-4.
8
Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the PCM harness connectors.
Measure the resistance of the S/C Lamp Signal circuit.
Is the resistance below 10.0 ohms?
All
Yes
→
No
→
Repair the S/C Lamp Signal circuit for an open.
Perform SPEED CONTROL VERIFICATION - VER-4.
9
Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the PCM harness connectors.
Measure the resistance between ground and the S/C Lamp Signal circuit.
Is the resistance below 100.0 ohms?
All
Yes
→
Repair the S/C Lamp Signal circuit for a short to ground.
Perform SPEED CONTROL VERIFICATION - VER-4.
No
→
10
Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the PCM harness connectors.
Disconnect the ASD Relay from the PDC.
Connect a jumper wire across ASD Relay connector cavities 30 and 87 (in the PDC).
Turn the ignition on.
Measure the voltage of the S/C Lamp Signal circuit.
Is the voltage below 8.0 volts?
All
Yes
→
No
→
Repair the S/C Lamp Signal circuit for a short to voltage.
Perform SPEED CONTROL VERIFICATION - VER-4.
11
Turn the ignition off.
Disconnect the ECM harness connectors.
Turn the ignition on.
Connect a jumper wire between the S/C Lamp Signal circuit and ground.
Observe the S/C Lamp.
Is the S/C Lamp on?
All
Yes
→
Replace and program the ECM in accordance with the Service
Information.
Perform SPEED CONTROL VERIFICATION - VER-4.
No
→
Replace and program the PCM in accordance with the Service
Information.
Perform SPEED CONTROL VERIFICATION - VER-4.
224
SPEED CONTROL
*CHECKING THE SPEED CONTROL OPERATION —
Continued
TEST
ACTION
APPLICABILITY
12
Refer to any Technical Service Bulletins (TSB) that may apply to this condition.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wiring harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Were any of the above conditions present?
All
Yes
→
Repair as necessary
Perform SPEED CONTROL VERIFICATION - VER-4.
No
→
13
Check the brake lamp switch for proper adjustment.
Is the brake lamp switch adjusted properly?
All
Yes
→
Replace and program the Engine Control Module in accordance
with the Service Information.
Perform SPEED CONTROL VERIFICATION - VER-4.
No
→
Adjust or replace the brake lamp switch as necessary.
Perform SPEED CONTROL VERIFICATION - VER-4.
14
Turn the ignition off.
Disconnect the Brake Lamp Switch harness connector.
Turn the ignition on.
Measure the voltage of the Secondary Brake Switch Signal circuit.
Is the voltage above 9.0 volts?
All
Yes
→
No
→
15
Turn the ignition off.
Disconnect the Brake Switch harness connector.
With the DRB, monitor the brake switch input.
Connect a jumper wire between the Brake Lamp Switch harness connector cavities
1 and 2.
Did the DRB display change from Pressed to Released?
All
Yes
→
Adjust or replace the Brake Lamp Switch.
Perform SPEED CONTROL VERIFICATION - VER-4.
No
→
16
Disconnect the Brake Lamp Switch harness connector.
Measure the resistance between ground and the Brake Lamp Switch harness
connector cavity 2.
Is the resistance below 5.0 ohms?
All
Yes
→
Replace and program the ECM in accordance with the Service
Information.
Perform SPEED CONTROL VERIFICATION - VER-4.
No
→
Repair the Ground circuit for an open.
Perform SPEED CONTROL VERIFICATION - VER-4.
225
SPEED CONTROL
*CHECKING THE SPEED CONTROL OPERATION —
Continued
TEST
ACTION
APPLICABILITY
17
Turn the ignition off.
Disconnect the Brake Lamp Switch harness connector.
Disconnect the ECM harness connectors.
Measure the resistance of the Secondary Brake Switch Signal between the Brake
Lamp Switch and the PCM.
Is the resistance below 10.0 ohms?
All
Yes
→
No
→
Repair the Secondary Brake Switch Signal circuit for an open.
Perform SPEED CONTROL VERIFICATION - VER-4.
18
Turn the ignition off.
Disconnect the Brake Lamp Switch harness connector.
Disconnect the ECM harness connectors.
Measure the resistance between ground and the Secondary Brake Switch Signal
circuit.
Is the resistance below 100.0 ohms?
All
Yes
→
Repair the Secondary Brake Switch Signal circuit for a short to
ground.
Perform SPEED CONTROL VERIFICATION - VER-4.
No
→
Replace and program the ECM in accordance with the Service
Information.
Perform SPEED CONTROL VERIFICATION - VER-4.
19
Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the Brake Lamp Switch harness connector.
Measure the resistance between ground and the Primary Brake Switch Sense circuit.
Is the resistance below 100.0 ohms?
All
Yes
→
Repair the Primary Brake Switch Signal circuit for a short to
ground.
Perform SPEED CONTROL VERIFICATION - VER-4.
No
→
20
Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the Brake Lamp Switch harness connector.
Measure the resistance of the Primary Brake Switch Sense circuit.
Is the resistance below 10.0 ohms?
All
Yes
→
No
→
Repair the Primary Brake Switch Signal circuit for an open.
Perform SPEED CONTROL VERIFICATION - VER-4.
21
Disconnect the Brake Lamp Switch harness connector.
Turn the ignition on.
Using a 12-volt test light connected to ground, check the Fused B+ circuit at the
Brake Lamp Switch harness connector..
Does the test light illuminate brightly?
All
Yes
→
No
→
Repair the Fused B+ circuit for an open.
Perform SPEED CONTROL VERIFICATION - VER-4.
226
SPEED CONTROL
*CHECKING THE SPEED CONTROL OPERATION —
Continued
TEST
ACTION
APPLICABILITY
22
NOTE: The Brake Switch must be properly adjusted before performing this
test.
Turn the ignition off.
Disconnect the ECM harness connectors.
Using a 12-volt test light connected to ground, probe the Primary Brake Switch Sense
circuit at the ECM harness connector.
While observing the test light, press and release the Brake Pedal several times.
Does the test light turn on and off while pressing and releasing the Brake Pedal?
All
Yes
→
Replace and program the ECM in accordance with the Service
Information.
Perform SPEED CONTROL VERIFICATION - VER-4.
No
→
Replace the Brake Lamp Switch.
Perform SPEED CONTROL VERIFICATION - VER-4.
23
Turn the ignition off.
Disconnect the S/C Switch 4-way harness connector.
Turn the ignition on.
With the DRB, read the cruise switch voltage while connecting a jumper wire
between the Sensor Ground circuit and the S/C Switch Signal circuit.
Did the voltage change from approximately 5.0 volts to below 0.3 volts?
All
Yes
→
Replace the S/C Switches.
Perform SPEED CONTROL VERIFICATION - VER-4.
No
→
24
Turn the ignition off.
Disconnect the S/C Switch 4-way harness connector.
Disconnect the ECM harness connector(s).
Measure the resistance of the S/C Switch Signal circuit.
Is the resistance below 10.0 ohms?
All
Yes
→
No
→
Repair the S/C Switch Signal circuit for an open.
Perform SPEED CONTROL VERIFICATION - VER-4.
25
Turn the ignition off.
Disconnect the S/C Switch 4-way harness connector.
Disconnect the ECM harness connector(s).
Measure the resistance of the S/C Sensor Ground circuit.
Is the resistance below 10.0 ohms?
All
Yes
→
No
→
Repair the Sensor Ground circuit for an open.
Perform SPEED CONTROL VERIFICATION - VER-4.
26
Turn the ignition off.
Disconnect the S/C Switch 4-way harness connector.
Disconnect the ECM harness connector(s).
Measure the resistance between ground and the S/C Switch Signal circuit.
Is the resistance below 100.0 ohms?
All
Yes
→
Repair the S/C Switch Signal circuit for a short to ground.
Perform SPEED CONTROL VERIFICATION - VER-4.
No
→
Replace and program the ECM in accordance with the Service
Information.
Perform SPEED CONTROL VERIFICATION - VER-4.
227
SPEED CONTROL
*CHECKING THE SPEED CONTROL OPERATION —
Continued
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