Jeep XJ. Manual — part 622
Symptom:
P1645-GLOW DISPLAY OPEN CIRCUIT
When Monitored and Set Condition:
P1645-GLOW DISPLAY OPEN CIRCUIT
When Monitored:
During wait to start lamp operation.
Set Condition:
The ECM detects an open or short to ground on the wait to start lamp
control circuit. NOTE: This code may set if the ASD/Diesel Power Relay contacts stick
together or the ASD/Diesel Power Relay control circuit shorts to ground after key-off.
POSSIBLE CAUSES
CHECK FOR OTHER DTCS
INTERMITTENT CONDITION
GLOW PLUG LAMP CONTROL CIRCUIT SHORTED TO GROUND
GLOW PLUG LAMP CONTROL CIRCUIT OPEN
ENGINE CONTROL MODULE
CHECK THE GLOW PLUG LAMP BULB
MESSAGE CENTER
TEST
ACTION
APPLICABILITY
1
NOTE: This DTC may set if the ASD/Diesel Power Relay contacts stick
together after ignition off.
Turn the ignition on.
With the DRB, check for additional DTCs.
Are other DTCs present?
All
Yes
→
Refer to the Symptom List for diagnosis of the other DTCs before
continuing.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
2
Turn the ignition on.
With the DRB, actuate the Glow Plug Lamp.
Is the Glow Plug Lamp cycling on and off?
All
Yes
→
No
→
140
DRIVEABILITY - DIESEL
TEST
ACTION
APPLICABILITY
3
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.
4
Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the Message Center harness connector.
Measure the resistance between ground and the Glow Plug Lamp Control circuit.
Is the resistance above 100 kohms?
All
Yes
→
No
→
Repair the Glow Plug Lamp Control circuit for a short to ground.
Perform ROAD TEST VERIFICATION - VER-2.
5
Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the Message Center harness connector.
Measure the resistance of the Glow Plug Lamp Control circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the Glow Plug Lamp Control circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
6
NOTE: Ensure the Message Center harness connector is connected.
Turn the ignition off.
Disconnect the ECM harness connectors.
Turn the ignition on.
Connect a jumper wire between ground and the Glow Plug Lamp Control circuit in
ECM harness connector C1.
Did the Glow Plug Lamp illuminate?
All
Yes
→
Replace and program the Engine Control Module in accordance
with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
141
DRIVEABILITY - DIESEL
P1645-GLOW DISPLAY OPEN CIRCUIT —
Continued
TEST
ACTION
APPLICABILITY
7
Turn the ignition off.
Remove and check the Glow Plug Lamp bulb from the Instrument Cluster.
Is the bulb OK?
All
Yes
→
Replace the Message Center.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Replace the Glow Plug Lamp bulb.
Perform ROAD TEST VERIFICATION - VER-2.
142
DRIVEABILITY - DIESEL
P1645-GLOW DISPLAY OPEN CIRCUIT —
Continued
Symptom:
P1645-GLOW DISPLAY SHORT CIRCUIT
When Monitored and Set Condition:
P1645-GLOW DISPLAY SHORT CIRCUIT
When Monitored:
During wait to start lamp operation.
Set Condition:
The ECM detects excessive current draw on the wait to start lamp control
circuit when attempting to activate the wait to start lamp.
POSSIBLE CAUSES
CHECK FOR OTHER DTCS
INTERMITTENT CONDITION
GLOW PLUG LAMP CONTROL CIRCUIT SHORTED TO GROUND
GLOW PLUG LAMP CONTROL CIRCUIT OPEN
ENGINE CONTROL MODULE
CHECK THE GLOW PLUG LAMP BULB
MESSAGE CENTER
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRB, check for additional DTCs.
Are other DTCs present?
All
Yes
→
Refer to the Symptom List for diagnosis of the other DTCs before
continuing.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
2
Turn the ignition on.
With the DRB, actuate the Glow Plug Lamp.
Is the Glow Plug Lamp cycling on and off?
All
Yes
→
No
→
143
DRIVEABILITY - DIESEL
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