Jeep XJ. Manual — part 625
TEST
ACTION
APPLICABILITY
2
With the DRB, select ENGINE, then BOSCH 3.1L VM DIESEL CONTROLLER from
the menu.
Display the Vehicle Identification Number (VIN).
Compare the programmed VIN to the vehicle VIN.
Does the programmed VIN match the vehicle VIN?
All
Yes
→
No
→
Replace and program the Engine Control Module in accordance
with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
3
With the DRB, select ENGINE, then JTEC CONTROLLER from the menu.
Display the Vehicle Identification Number (VIN).
Compare the programmed VIN to the vehicle VIN.
Does the programmed VIN match the vehicle VIN?
All
Yes
→
No
→
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
4
Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the PCM harness connectors.
Remove the ASD/Diesel Power Relay from the PDC.
Connect a jumper wire between cavity 30 and cavity 87 of the ASD/Diesel Power
Relay connector.
Turn the ignition on.
Measure the voltage of the Immobilizer Signal circuit.
Is the voltage below 1.0 volt?
All
Yes
→
No
→
Repair the Immobilizer Signal circuit for a short to voltage.
Perform ROAD TEST VERIFICATION - VER-2.
NOTE: Remove the jumper wire and install the ASD/Diesel Power Relay.
5
Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the PCM harness connectors.
Measure the resistance between ground and the Immobilizer Signal circuit.
Is the resistance above 100 kohms?
All
Yes
→
No
→
Repair the Immobilizer Signal circuit for a short to ground.
Perform ROAD TEST VERIFICATION - VER-2.
6
Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the PCM harness connectors.
Measure the resistance of the Immobilizer Signal circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the Immobilizer Signal circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
152
DRIVEABILITY - DIESEL
P1685-VEHICLE THEFT ALARM IMMOBILIZER SIG LOST —
Continued
TEST
ACTION
APPLICABILITY
7
Turn the ignition off.
NOTE: Ensure the ECM harness connectors are connected.
Measure the amperage between ground and the Immobilizer Signal circuit in PCM
harness connector C3.
Turn the ignition on.
Is the amperage between 1.0 and 1.4 milliamps?
All
Yes
→
No
→
Replace and program the Engine Control Module in accordance
with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
8
Turn the ignition off.
NOTE: Ensure all connectors are connected.
With the DRB oscilloscope function, select LAB SCOPE and set the oscilloscope to the
following specifications:
Voltage Range to +20.0V
Probe to X10
Time Range to 0.1s/Div
Turn the ignition on.
With the DRB oscilloscope lead, back probe PCM harness connector C3 cavity 16.
NOTE: A valid Immobilizer Signal voltage will cycle high and low.
Does the DRB display show the 12-volt Immobilizer Signal voltage cycling high and
low?
All
Yes
→
Replace and program the Engine Control Module in accordance
with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
153
DRIVEABILITY - DIESEL
P1685-VEHICLE THEFT ALARM IMMOBILIZER SIG LOST —
Continued
Symptom:
P1690-FAN CONTROL OPEN CIRCUIT
When Monitored and Set Condition:
P1690-FAN CONTROL OPEN CIRCUIT
When Monitored:
With the ignition on.
Set Condition:
The ECM detects an open or short to ground on the radiator fan relay
control circuit.
POSSIBLE CAUSES
INTERMITTENT CONDITION
ASD/DIESEL POWER RELAY OUTPUT CIRCUIT OPEN
SUBSTITUTE RADIATOR FAN RELAY
RADIATOR FAN RELAY CONTROL CIRCUIT SHORTED TO GROUND
RADIATOR FAN RELAY CONTROL CIRCUIT OPEN
ENGINE CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRB, actuate the Radiator Fan Relay.
Does the Radiator Fan cycle on and off?
All
Yes
→
No
→
2
WARNING: KEEP CLEAR OF THE ENGINE’S MOVING PARTS.
NOTE: The conditions that set the DTC are not present at this time. The
following list may help in identifying the intermittent condition.
With the engine running at normal operating temperature, monitor the DRB
parameters related to the DTC while wiggling the wiring harness. Look for param-
eter values to change and/or a DTC to set.
Review the DTC When Monitored and Set Conditions. If possible, try to duplicate the
conditions under which the DTC was set.
Refer to any Technical Service Bulletins (TSB) that may apply.
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 ROAD TEST VERIFICATION - VER-2.
No
→
Test Complete.
154
DRIVEABILITY - DIESEL
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Remove the Radiator Fan Relay from the PDC.
Turn the ignition on.
Using a 12-volt test light connected to ground, check the ASD/Diesel Power Relay
Output circuit.
Did the test light illuminate brightly?
All
Yes
→
No
→
Repair the ASD/Diesel Power Relay Output circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
4
Turn the ignition off.
Install a substitute relay in place of the Radiator Fan Relay.
Turn the ignition on.
With the DRB, actuate the Radiator Fan Relay.
Does the Radiator Fan cycle on and off?
All
Yes
→
Replace the Radiator Fan Relay.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
5
Turn the ignition off.
Remove the Radiator Fan Relay from the PDC.
Disconnect the ECM harness connectors.
Measure the resistance between ground and the Radiator Fan Relay Control circuit.
Is the resistance below 100 kohms?
All
Yes
→
Repair the Radiator Fan Relay Control circuit for a short to
ground.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
6
Turn the ignition off.
Remove the Radiator Fan Relay from the PDC.
Disconnect the ECM harness connectors.
Measure the resistance of the Radiator Fan Relay Control circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the Radiator Fan Relay Control circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
7
If there are no possible causes remaining, view repair.
All
Repair
Replace and program the Engine Control Module in accordance
with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
155
DRIVEABILITY - DIESEL
P1690-FAN CONTROL OPEN CIRCUIT —
Continued
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст