Jeep XJ. Manual — part 618
Symptom:
P1605-TERMINAL 15 PLAUSIBILITY AFTER START UP
When Monitored and Set Condition:
P1605-TERMINAL 15 PLAUSIBILITY AFTER START UP
When Monitored:
During power-up and in after-run mode.
Set Condition:
The switched ignition voltage at ECM cavity C1-47 drops to 0 volt and
battery voltage is present at an ECM cavity other than cavities C1-33 and C1-45. NOTE:
The name
9Terminal 159 refers to the internal terminal on the Bosch controller and not to
the actual switched ignition cavity (cavity C1-47) in the ECM harness connector.
POSSIBLE CAUSES
INTERMITTENT CONDITION
ASD/DIESEL POWER RELAY
ENGINE CONTROL MODULE
ECM CIRCUIT SHORTED TO VOLTAGE
ASD RELAY OUTPUT CIRCUIT SHORTED TO VOLTAGE
ASD RELAY CONTROL CIRCUIT SHORTED TO GROUND
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRB, erase ECM DTCs.
Cycle the ignition switch on and off several times, pausing for at least 10 seconds at
each key off and key on.
Turn the ignition on.
With the DRB, read ECM DTCs.
Did this DTC reset?
All
Yes
→
No
→
2
Turn the ignition off.
Disconnect the ECM harness connectors.
Measure the voltage of all cavities in the ECM harness connectors except cavities
C1-33 and C1-45.
Is the voltage above 2.0 volts on any of the cavity terminals except C1-33 and C1-45?
All
Yes
→
No
→
Replace and program the Engine Control Module in accordance
with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
124
DRIVEABILITY - DIESEL
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the ECM harness connectors.
Measure the voltage of ECM harness connector C1, cavities 2 and 28.
Is voltage present on ECM harness connector C1, cavities 2 and 28?
All
Yes
→
No
→
Repair the ECM circuit that measured above 2.0 volts for a short
to voltage.
Perform ROAD TEST VERIFICATION - VER-2.
4
Turn the ignition off.
Disconnect the ECM harness connectors.
Remove the ASD/Diesel Power Relay from the PDC.
Measure the voltage on ECM harness connector C1 cavity 2.
Is the voltage below 2.0 volts?
All
Yes
→
No
→
Repair the ASD Relay Output circuit for a short to voltage.
Perform ROAD TEST VERIFICATION - VER-2.
5
Turn the ignition off.
Disconnect the ECM harness connectors.
Remove the ASD/Diesel Power Relay from the PDC.
Measure the resistance between ground and the ASD Relay Control circuit.
Is the resistance above 100 kohms?
All
Yes
→
Replace the ASD/Diesel Power Relay.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Repair the ASD Relay Control circuit for a short to ground.
Perform ROAD TEST VERIFICATION - VER-2.
6
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.
125
DRIVEABILITY - DIESEL
P1605-TERMINAL 15 PLAUSIBILITY AFTER START UP —
Continued
Symptom:
P1625-ASD/DIESEL POWER RELAY SHUTS OFF TOO LATE
When Monitored and Set Condition:
P1625-ASD/DIESEL POWER RELAY SHUTS OFF TOO LATE
When Monitored:
During after-run.
Set Condition:
The internal ECM timer determines that the ASD/Diesel Power Relay
remains on too long when AFTER-RUN mode of operation has been completed.
POSSIBLE CAUSES
CHECK FOR OTHER DTCS
INTERMITTENT CONDITION
SUBSTITUTE ASD/DIESEL POWER RELAY
ASD/DIESEL POWER RELAY CONTROL CIRCUIT SHORTED TO GROUND INTERMITTENTLY
ASD/DIESEL POWER RELAY OUTPUT CIRCUIT SHORTED TO VOLTAGE
ENGINE CONTROL MODULE
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, erase ECM DTCs.
Perform several ignition key cycles, pausing for at least 10 seconds between each
cycle.
Turn the ignition on.
With the DRB, read ECM DTCs.
Did this DTC reset?
All
Yes
→
No
→
126
DRIVEABILITY - DIESEL
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Install a substitute relay in place of the ASD/Diesel Power Relay.
Perform several ignition key cycles, pausing for at least 10 seconds between each
cycle.
Turn the ignition on.
With the DRB, read ECM DTCs.
Did this DTC reset?
All
Yes
→
No
→
Replace the ASD/Diesel Power Relay.
Perform ROAD TEST VERIFICATION - VER-2.
4
Turn the ignition off.
Remove the ASD/Diesel Power Relay from the PDC.
Disconnect the ECM harness connectors.
Measure the resistance between ground and the ASD/Diesel Power Relay Control
circuit while wiggling the wiring harness and connectors.
Was the resistance below 5.0 ohms at any time while wiggling the wiring harness and
connectors?
All
Yes
→
Repair the ASD/Diesel Power Relay Control circuit for an inter-
mittent short to ground.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
5
Turn the ignition off.
Remove the ASD/Diesel Power Relay from the PDC.
Turn the ignition on.
Measure the voltage of the ASD/Diesel Power Relay Output circuit.
Is the voltage below 0.5 volt?
All
Yes
→
No
→
Repair the ASD/Diesel Power Relay Output circuit for a short to
voltage.
Perform ROAD TEST VERIFICATION - VER-2.
6
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.
127
DRIVEABILITY - DIESEL
P1625-ASD/DIESEL POWER RELAY SHUTS OFF TOO LATE —
Continued
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