Jeep XJ. Manual — part 855
Symptom:
P1899-P/N SWITCH PERFORMANCE
POSSIBLE CAUSES
INTERMITTENT PARK/NEUTRAL SWITCH SENSE CIRCUIT
PARK/NEUTRAL POSITION SWITCH
PARK/NEUTRAL SWITCH SENSE CIRCUIT OPEN
PARK/NEUTRAL SWITCH SENSE CIRCUIT SHORTED TO GROUND
POWERTRAIN CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, read DTCs.
Is the Good Trip Counter for P-1899 displayed and equal to 0?
All
Yes
→
No
→
2
Turn the ignition on.
With the DRBIII
t, read the PNP switch input state.
While moving the gear selector through all gear positions (Park to 1st and back to
Park), watch the DRB display.
Did the DRBIII
t display P/N and D/R in the correct gear positions?
All
Yes
→
Test Complete.
No
→
3
Turn the ignition off.
Disconnect the PCM C1 harness connector.
Disconnect the PNP switch harness connector.
Check connectors - Clean/repair as necessary
Measure the resistance of the PNP switch sense circuit between the PCM C1 harness
connector and the PNP switch harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the PNP switch sense circuit for an open.
Perform AW4 TRANS VERIFICATION TEST-VER1.
4
Turn the ignition off.
Disconnect the PCM C1 harness connector.
Disconnect the PNP switch harness connector.
Check connectors - Clean/repair as necessary
Measure the resistance between ground and the PNP switch sense circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
Repair the PNP switch sense circuit for a short to ground.
Perform AW4 TRANS VERIFICATION TEST-VER1.
No
→
181
DRIVEABILITY - GAS
TEST
ACTION
APPLICABILITY
5
Turn the ignition off.
Disconnect the PCM C1 harness connector.
Check connectors - Clean/repair as necessary
Move the gear selector through all gear positions, from Park to 1st and back.
While moving the gear selector through the gear positions, measure the resistance
between ground and the PNP switch sense circuit in the PCM C1 harness connector.
Did the display change from above 10.0 ohms to below 10.0 ohms?
All
Yes
→
No
→
Replace the Park/Neutral Position Switch in accordance with the
Service Information.
Perform AW4 TRANS VERIFICATION TEST-VER1.
6
If there are no possible causes remaining, view repair.
All
Repair
Replace the Powertrain Control Module.
Perform AW4 TRANS VERIFICATION TEST-VER1.
7
At this time, the conditions required to set the DTC are not present.
Note: Use the Freeze Frame Data to help duplicate the conditions that set
the DTC. Pay particular attention to the DTC set conditions, such as, VSS,
MAP, ECT, and Load.
Note: Visually inspect the related wiring harness. Look for any chafed,
pierced, pinched, or partially broken wires.
Note: Visually inspect the related wiring harness connectors. Look for
broken, bent, pushed out, or corroded terminals.
Note: Refer to any technical service bulletins that may apply.
Were any problems found?
All
Yes
→
Repair as necessary.
Perform AW4 TRANS VERIFICATION TEST-VER1.
No
→
Test Complete.
182
DRIVEABILITY - GAS
P1899-P/N SWITCH PERFORMANCE —
Continued
Symptom:
*CHECKING EVAPORATIVE EMISSION OPERATION WITH NO
DTC’S
POSSIBLE CAUSES
PURGE SYSTEM CONTAMINATED
ROLLOVER VALVE
VACUUM HARNESS INTERMITTENT
WIRING HARNESS INTERMITTENT
TEST
ACTION
APPLICABILITY
1
Start the engine, Allow the engine to reach normal operating temperature.
Note: Engine must be in closed loop.
With the DRBIII
t, go to Purge Vapors Test. Press 3 to flow.
Note: Short Term Adaptive should change.
Did Short Term Adaptive change?
All
Yes
→
Test Complete.
No
→
2
At this time, the conditions required to set the DTC are not present.
Note: Use the Freeze Frame Data to help you duplicate the conditions that
set the DTC. Pay particular attention to the DTC set conditions, such as,
VSS, MAP, ECT, and Load.
Note: Visually inspect the Evap Purge Solenoid and vacuum harness. Look
for any chafed, pierced, pinched, or partially broken hoses.
Note: Refer to any technical service bulletins that may apply.
Were any problems found?
All
Yes
→
Repair vacuum harness/connections as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
No
→
3
At this time, the conditions required to set the DTC are not present.
Note: Use the Freeze Frame Data to help you duplicate the conditions that
set the DTC. Pay particular attention to the DTC set conditions, such as,
VSS, MAP, ECT, and Load.
Note: Visually inspect the related wiring harness. Look for any chafed,
pierced, pinched, or partially broken wires.
Note: Visually inspect the related wire harness connectors. Look for broken,
bent, pushed out, or corroded terminals.
Note: Refer to any technical service bulletins that may apply.
Perform a wiggle test of the Evap Purge Solenoid wiring while the circuit is actuated
with the DRBIII
t. Listen for the solenoid to quit actuating. Also watch for the Good
Trip Counter to change to 0.
Were any problems found?
All
Yes
→
Repair wiring harness/connectors as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
No
→
183
DRIVEABILITY - GAS
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Remove the Purge Solenoid.
Inspect the line from rollover valve to the solenoid.
Is liquid fuel in the line?
All
Yes
→
Replace the Rollover Valve.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
No
→
5
Turn the ignition off.
Remove the Purge solenoid and tap the ports against a clean solid surface.
Did any foreign material fall out?
All
Yes
→
Replace the purge solenoid and clean or replace the vacuum and
purge lines and Evap canister.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
No
→
Test Complete.
184
DRIVEABILITY - GAS
*CHECKING EVAPORATIVE EMISSION OPERATION WITH NO DTC’S —
Continued
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