Jeep XJ. Manual — part 817
TEST
ACTION
APPLICABILITY
4
Ignition on, engine not running.
With the DRBIII
t, read DTC’s.
Are there any
9Charging System9 trouble codes?
All
Yes
→
Refer to Symptom list for problems related to Charging.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
No
→
5
Turn ignition on, engine not running.
Measure voltage between the Generator B(+) Terminal and the Battery (+) Post.
Caution: Ensure all wires are clear of the engine’s moving parts.
Start the engine.
Is the voltage above 0.4 volt?
All
Yes
→
Repair the B(+) Circuit for high resistance between the Generator
and Battery.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
No
→
6
Start the engine.
Warm the engine to operating temperature.
Caution: Ensure all wires are clear of the engine’s moving parts.
Measure voltage between the Generator case and Battery (-) Post.
Is the voltage above 0.1 volt?
All
Yes
→
Repair Generator Ground for high resistance, Generator Case to
Battery (-) side.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
No
→
7
Ignition on, engine not running.
With the DRBIII
t, read the Battery voltage and record the results.
Measure Battery voltage B(+) to B(-) Terminal and record the results.
Compare the two voltage readings.
Is the voltage difference less than one volt?
All
Yes
→
Test Complete.
No
→
8
Ignition on, engine not running.
With the DRBIII
t, read the Battery voltage and record the results.
Turn the Ignition off.
Disconnect the PCM harness connector(s).
Note: Check connectors - Clean/repair as necessary.
Ignition on, engine not running.
Measure the Fused B(+) at PCM Connector.
Is the voltage within one volt of the DRB recorded reading?
All
Yes
→
No
→
Repair the B(+) Circuit for high resistance between the PCM and
the Battery.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
9
If there are no possible causes remaining, view repair.
All
Repair
Replace the PCM.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
29
CHARGING
*CHECKING
CHARGING
SYSTEM
OPERATION
WITH
NO
DTC’S
PRESENT —
Continued
Symptom:
*CHECKING THE AMBIENT/BATTERY TEMPERATURE SENSOR
POSSIBLE CAUSES
AMBIENT/BATT TEMPERATURE SENSOR
AMBIENT/BATT (OUT OF CALIBRATION)
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t in sensors, read the 9Ambient/Bat Tmp Deg9 value and record the
reading.
Using a temp probe, measure the air temperature near the AMBIENT/BATT.
Is the recorded AMBIENT/BATT temperature value within 10° of the temperature
probe reading?
All
Yes
→
No
→
Replace the AMBIENT/BATT Temperature Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
2
Turn the ignition off.
Disconnect the AMBIENT/BATT harness Connector.
Note: Check connectors - Clean/repair as necessary.
Connect a jumper across the Terminals of the AMBIENT/BATT (harness side).
Ignition on, engine not running.
With the DRBIII
t in Inputs/Outputs, read the AMBIENT/BATT voltage.
Is the voltage reading equal to zero?
All
Yes
→
Replace the AMBIENT/BATT temperature sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
No
→
Test Complete.
30
CHARGING
Symptom:
P-1685 INVALID SKIM KEY
When Monitored and Set Condition:
P-1685 INVALID SKIM KEY
When Monitored:
With the ignition on.
Set Condition:
The PCM does not receive a valid key message from the SKIM.
POSSIBLE CAUSES
INCORRECT VIN IN PCM
INVALID SKIM KEY NOT PRESENT
NO COMMUNICATION WITH SKIM
NO VIN PROGRAMMED IN THE PCM
PCM
SKIM TROUBLE CODES SET
TEST
ACTION
APPLICABILITY
1
With the DRB III, read the PCM DTCs. Look for P1685.
Turn the ignition on.
Is the Starts Since Set counter for DTC P1685 displayed and equal to 0?
All
Yes
→
No
→
2
Turn the ignition on.
With the DRB III, attempt to communicate with the SKIM.
Can you communicate with the SKIM?
All
Yes
→
No
→
Refer to symptom BUS +/- SIGNAL OPEN FROM SKIM in the
COMMUNICATION category.
Perform ROAD TEST VERIFICATION - VER-2.
3
Turn the ignition on.
With the DRB III, check for SKIM DTC’s.
Are there any trouble codes set in the SKIM?
All
Yes
→
Repair all SKIM DTC’s.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
31
COMMUNICATION
TEST
ACTION
APPLICABILITY
4
NOTE: If a VIN has not been programmed into the PCM, program VIN into
the PCM and retest.
Turn the ignition on.
With the DRB III, display the VIN that is programmed in the PCM.
Is there a VIN programmed in the PCM?
All
Yes
→
No
→
Program the correct VIN into the PCM and retest.
Perform ROAD TEST VERIFICATION - VER-2.
5
Turn the ignition on.
With the DRB III, display the VIN that is programmed in the PCM.
Is the correct VIN programmed in the PCM?
All
Yes
→
No
→
Replace and program the PCM in accordance with the Service
Information.
Perform ROAD TEST VERIFICATION - VER-2.
6
Turn the ignition off.
Replace and program the Sentry Key Immobilizer Module in accordance with the
Service Information.
Turn the ignition on.
With the DRB III, erase all DTCs.
Attempt to start and idle the engine.
With the DRB III, read the PCM DTCs.
Does the DRB III display this code?
All
Yes
→
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Test Complete.
7
NOTE: This DTC could have been set if the SKIM harness connector was
disconnected, or if the SKIM was replaced recently.
NOTE: All keys that the customer uses for this vehicle must be tested to
verify they are operating properly.
Verify the correct VIN is programmed in both the PCM and SKIM modules.
Turn the ignition off.
With the next customer key turn the ignition key on and crank the engine to start.
With the DRB III, read the PCM DTCs. Look for P1685
Is the Starts Since Set Counter for DTC P1685 displayed and equal to 0?
All
Yes
→
Replace the Ignition Key.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Test Complete.
NOTE: If this DTC can not be reset, it may have been an actual theft attempt.
32
COMMUNICATION
P-1685 INVALID SKIM KEY —
Continued
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