Jeep XJ. Manual — part 645
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the PCM harness connector.
Disconnect the ECM harness connector.
Measure the resistance of the Immobilizer Signal circuit between the PCM harness
connector and the ECM harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the Immobilizer Signal circuit for an open.
Perform NO START VERIFICATION - VER-1.
4
Turn the ignition off.
Disconnect the PCM harness connector.
Disconnect the ECM harness connector.
Measure the resistance between ground and the Immobilizer Signal circuit at the
PCM harness connector.
Is the resistance above 100 kohms?
All
Yes
→
No
→
Repair the Immobilizer Signal circuit for a short to ground.
Perform NO START VERIFICATION - VER-1.
5
Turn the ignition off.
Disconnect the PCM harness connector.
Turn the ignition on.
Measure the amperage between PCM harness connector C-3 cavity 16 and ground.
Is the amperage between 1.0 and 1.4 milliamperes?
All
Yes
→
No
→
Replace and program the ECM in accordance with the Service
Information.
Perform NO START VERIFICATION - VER-1.
6
With the DRBIII
t, select the Lab Scope function.
Set the voltage range to +20.0V
Set the probe to X10.
Set the time range to 0.1S/Div.
Turn the ignition on.
Using the oscilloscope lead, backprobe the PCM harness connector C3 cavity 16.
NOTE: A valid immobilizer signal will cycle high and low similar to the
pattern shown in Charts and Graphs.
Does the DRB display show the 12-volt signal cycling high and low?
All
Yes
→
Replace and program the ECM in accordance with the Service
Information.
Perform NO START VERIFICATION - VER-1.
No
→
Replace the PCM in accordance with the Service Information.
Perform NO START VERIFICATION - VER-1.
232
STARTING
*NO START CONDITION —
Continued
TEST
ACTION
APPLICABILITY
7
Turn the ignition off.
Disconnect the Fuel Injection Pump 10-way harness connector.
Measure the resistance between cavity 8 and cavity 9 of the Fuel Injection Pump
10-way harness connector.
Is the resistance between 0.7 and 1.6 ohms?
All
Yes
→
No
→
Replace the Fuel Injection Pump assembly.
Perform NO START VERIFICATION - VER-1.
8
Turn the ignition off.
Disconnect the ECM harness connector.
Remove the ASD Relay from the PDC.
Connect a jumper wire between ASD Relay connector cavity 30 and cavity 87 in the
PDC.
Turn the ignition on.
Measure the voltage of the Fuel Quantity Actuator circuit at ECM harness connector
C2 cavity 59.
Is the voltage above 1.0 volt?
All
Yes
→
Repair the Fuel Quantity Actuator circuit for a short to voltage.
Perform NO START VERIFICATION - VER-1.
No
→
9
Inspect and fuel system lines for restrictions, leaks or other problems.
Is there any evidence of problems?
All
Yes
→
Repair as necessary.
Perform NO START VERIFICATION - VER-1.
No
→
10
Refer to the Service Information and perform the fuel pressure test.
Is the fuel pressure within specification?
All
Yes
→
No
→
Check the Fuel Injection Pump drive. If the drive is working
properly, replace the Fuel Injection Pump.
Perform NO START VERIFICATION - VER-1.
11
Refer to the Service Information and check the Fuel Injection Pump Timing.
Is the Fuel Injection Pump timing correct?
All
Yes
→
Check the fuel supply for contamination.
Perform NO START VERIFICATION - VER-1.
No
→
Refer to the Service Information to correctly time the Fuel
Injection Pump.
Perform NO START VERIFICATION - VER-1.
233
STARTING
*NO START CONDITION —
Continued
Symptom List:
ANTENNA FAILURE
COP FAILURE
EEPROM FAILURE
INTERNAL FAULT
RAM FAILURE
SERIAL LINK INTERNAL FAULT
STACK OVERFLOW FAILURE
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be ANTENNA FAILURE.
When Monitored and Set Condition:
ANTENNA FAILURE
When Monitored:
Every 250 milliseconds with the ignition on.
Set Condition:
The SKIM’s microcontroller determines that an antenna circuit fault has
occurred for 2.0 consecutive seconds.
COP FAILURE
When Monitored:
With the ignition on.
Set Condition:
The COP timer is not reset by the microcontroller every 65.5 milliseconds
EEPROM FAILURE
When Monitored:
With the ignition on.
Set Condition:
When the value written to EEPROM memory does not equal the value
read back after the write operation.
INTERNAL FAULT
When Monitored:
With the ignition on.
Set Condition:
The SKIM has detected a fault during an internal self test.
RAM FAILURE
When Monitored:
With the ignition on.
Set Condition:
The RAM fails a test that checks the RAM’s ability to retain memory.
SERIAL LINK INTERNAL FAULT
When Monitored:
With the ignition on.
Set Condition:
The SKIM fails an internal J1850 communication self test.
STACK OVERFLOW FAILURE
When Monitored:
With the ignition on.
Set Condition:
The microcontroller has exceeded its stack space limit.
234
VEHICLE THEFT/SECURITY
POSSIBLE CAUSES
SKIM INTERNAL DTC FAILURE
TEST
ACTION
APPLICABILITY
1
Note: This trouble code indicates an internal SKIM fault.
With the DRB III, read and record the SKIM DTC’s and then erase the SKIM DTC’s
Perform 10 ignition key cycles, leaving the ignition key on for a minimum of 90
seconds per cycle.
With the DRB III, read the SKIM DTC’s.
Did the same SKIM DTC return?
All
Yes
→
Replace and program the Sentry Key Immobilizer Module in
accordance with the Service Information.
Perform SKIS VERIFICATION.
No
→
Test Complete.
235
VEHICLE THEFT/SECURITY
ANTENNA FAILURE —
Continued
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