Jeep XJ. Manual — part 624
Symptom:
P1660-REDUNDANT EMERG. STOP POWERSTAGE DEFECTIVE
When Monitored and Set Condition:
P1660-REDUNDANT EMERG. STOP POWERSTAGE DEFECTIVE
When Monitored:
With the ignition on.
Set Condition:
The ECM detects an open or short to ground on the fuel shutdown solenoid
control circuit.
POSSIBLE CAUSES
INTERMITTENT CONDITION
FUEL SHUTDOWN SOLENOID CONTROL CIRCUIT OPEN
FUEL SHUTDOWN SOLENOID CONTROL CIRCUIT SHORTED TO GROUND
FUEL SHUTDOWN SOLENOID (FUEL INJECTION PUMP) SHORTED INTERNALLY
INTERNAL FUEL INJECTION PUMP TEST
ENGINE CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRB, erase ECM DTCs.
Cycle the ignition on and off several times, pausing for 10 seconds at key off each
time.
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.
Disconnect the Fuel Injection Pump harness connector.
Measure the resistance of the Fuel Shutdown Solenoid Control circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the Fuel Shutdown Solenoid Control circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
148
DRIVEABILITY - DIESEL
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the Fuel Injection Pump harness connector.
Measure the resistance between ground and the Fuel Shutdown Solenoid Control
circuit.
Is the resistance above 100 kohms?
All
Yes
→
No
→
Repair the Fuel Shutdown Solenoid Control circuit for a short to
ground.
Perform ROAD TEST VERIFICATION - VER-2.
4
Turn the ignition off.
Disconnect the Fuel Injection Pump harness connector.
Turn the ignition on.
With the DRB, actuate the Fuel Shutdown Solenoid.
Measure the voltage on the Fuel Shutdown Solenoid Control circuit.
Does the voltage cycle from B+ to below 1.0 volt?
All
Yes
→
Replace the Fuel Injection Pump in accordance with the Service
Information.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
5
Disconnect the Fuel Injection Pump harness connector.
Measure the resistance between the following cavities in the Fuel Injection Pump
connector (fuel pump side):
Cavity 1 to cavities 4, 5, 6, 7, 8, 9, and 10.
Cavity 4 to cavities 5, 6, 7, 8, 9, and 10.
Cavity 5 to cavities 6, 7, 8, and 9.
Cavity 7 to cavities 6, 8, 9, and 10.
Cavity 8 to cavities 6 and 10.
NOTE: The resistance should be above 100 ohms for all measurements.
Is the resistance above 100 ohms for each of the measurements?
All
Yes
→
Replace and program the Engine Control Module in accordance
with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Replace the Fuel Injection Pump in accordance with the Service
Information.
Perform ROAD TEST VERIFICATION - VER-2.
149
DRIVEABILITY - DIESEL
P1660-REDUNDANT EMERG. STOP POWERSTAGE DEFECTIVE —
Continued
TEST
ACTION
APPLICABILITY
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.
150
DRIVEABILITY - DIESEL
P1660-REDUNDANT EMERG. STOP POWERSTAGE DEFECTIVE —
Continued
Symptom List:
P1685-VEHICLE THEFT ALARM IMMOBILIZER SIG LOST
P1685-VEHICLE THEFT ALARM INVALID SKIM MESSAGE
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P1685-VEHICLE THEFT ALARM
IMMOBILIZER SIG LOST.
When Monitored and Set Condition:
P1685-VEHICLE THEFT ALARM IMMOBILIZER SIG LOST
When Monitored:
With the ignition on and the immobilizer disarmed.
Set Condition:
The ECM detects an open, short to ground, or short to voltage on the
immobilizer signal circuit.
P1685-VEHICLE THEFT ALARM INVALID SKIM MESSAGE
When Monitored:
With the ignition on.
Set Condition:
The ECM determines that the coded message from the PCM does not
match the message programmed into memory.
POSSIBLE CAUSES
CHECK FOR SKIM COMMUNICATION AND DTCS
ECM - VIN MISMATCH
PCM - VIN MISMATCH
IMMOBILIZER SIGNAL CIRCUIT SHORTED TO VOLTAGE
IMMOBILIZER SIGNAL CIRCUIT SHORTED TO GROUND
ENGINE CONTROL MODULE
IMMOBILIZER SIGNAL CIRCUIT OPEN
ENGINE CONTROL MODULE - INTERNAL SHORT
POWERTRAIN CONTROL MODULE - INTERNAL SHORT
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRB, check for Sentry Key Immobilizer Module communication and DTCs.
Are any SKIS problems or DTCs present?
All
Yes
→
Refer to symptom list for problems related to SKIM Communica-
tion and DTCs before continuing.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
151
DRIVEABILITY - DIESEL
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