Jeep Wrangler TJ. Manual — part 136
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the PCM harness connectors.
Disconnect the SKIM harness connector.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING
THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMI-
NALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
Measure the resistance of the PCI Bus circuit from the SKIM harness connector to
the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 4
No
→ Repair the open in the PCI Bus circuit between the PCM and the
SKIM.
Perform SKIS VERIFICATION.
4
Connect the PCM harness connectors.
Replace the Sentry Key Immobilizer Module in accordance with the Service Infor-
mation.
Ignition on, engine not running.
Display and erase all PCM and SKIM DTCs.
Perform 5 ignition key cycles leaving the ignition key on for 90 seconds per cycle.
With the DRB, display PCM DTCs.
Does the DRB display the same DTC?
All
Yes
→ Replace and program the Powertrain Control Moldule per service
Information.
Perform SKIS VERIFICATION.
No
→ Test Complete.
269
DRIVEABILITY - NGC
U0168-NO SKIM BUS MESSAGE —
Continued
Symptom:
*CHECKING A/C SYSTEM OPERATION WITH NO DTCS
POSSIBLE CAUSES
CHECK FOR PCM DTCS
REFRIGERATION SYSTEM NOT PROPERLY CHARGED
HIGH PRESS CUT-OFF SWITCH
LOW PRESSURE SWITCH
POWERTRAIN CONTROL MODULE
A/C CLUTCH COIL
A/C COMPRESSOR CLUTCH GROUND CIRCUIT OPEN
(C3) A/C CLUTCH RELAY OUTPUT CIRCUIT OPEN
A/C REQUEST CIRCUIT OPEN
(A17) FUSED B+ CIRCUIT OPEN
A/C CLUTCH RELAY
A/C - HEATER CONTROL MODULE
BODY CONTROL MODULE
A/C ON/OFF CONTROL CIRCUIT OPEN
A/C ON/OFF CONTROL CIRCUIT OPEN
TEST
ACTION
APPLICABILITY
1
With the DRBIII
t, check for PCM DTCs.
Are any DTCs present?
All
Yes
→ Return to the symptom list and choose the symptom(s).
Perform POWERTRAIN VERIFICATION TEST VER - 2.
No
→ Go To 2
2
Turn the ignition off.
Verify that the Refrigerant System is properly charged per Service Procedure.
Is the Refrigerant System properly charged?
All
Yes
→ Go To 3
No
→ Properly charge the Refrigerant System per Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
3
Verify the High Pressure Cut-Off Switch operation per Service Information.
Is the High Pressure Cut-Off Switch OK?
All
Yes
→ Go To 4
No
→ Replace the High Pressure Cut-Off Switch.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
270
DRIVEABILITY - NGC
TEST
ACTION
APPLICABILITY
4
Verify the Low Pressure Switch operation per Service Information.
Is the Low Pressure Switch OK?
All
Yes
→ Go To 5
No
→ Replace the Low Pressure Switch.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
5
Ignition on, engine not running.
Position the Mode switch on the A/C - Heater Control Module to the Panel position.
With the DRBIII
t in BCM, select Inputs/Outputs.
Monitor the A/C Select Switch state while pressing the A/C mode switch on and off.
Does the A/C Select Switch state change accordingly.
All
Yes
→ Go To 6
No
→ Go To 13
6
Position the Mode switch on the A/C - Heater Control Module to the Panel position.
With the DRBIII
t in Powertrain, select Engine and select Inputs/Outputs.
Monitor the A/C Select Switch state while pressing the A/C mode switch on and off.
Does the A/C Select Switch state change accordingly.
All
Yes
→ Go To 7
No
→ Replace and program the Powertrain Control Module per Service
Information.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
7
Connect a test light between the ground circuit and the A/C Clutch Relay Output
circuit.
With the DRBIII
t, actuate the A/C Clutch Relay.
Does the test light illuminate brightly on and off with the relay actuation?
All
Yes
→ Replace the A/C Clutch Coil.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
No
→ Go To 8
8
Turn the ignition off.
Disconnect the A/C Clutch harness connector.
NOTE: Check connectors - Clean/repair as necessary.
Measure the resistance between ground and the A/C Compressor Clutch ground
circuit in the A/C Clutch harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 9
No
→ Repair the open in the A/C Compressor Clutch ground circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
9
Turn the ignition off.
Remove the A/C Clutch Relay.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance of the (C3) A/C Clutch Relay Output circuit between the
Relay and the A/C Clutch Coil.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 10
No
→ Repair the open in the (C3) A/C Clutch Relay Output circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
271
DRIVEABILITY - NGC
*CHECKING A/C SYSTEM OPERATION WITH NO DTCS —
Continued
TEST
ACTION
APPLICABILITY
10
Engine Running.
Turn the A/C system on and the fan on high.
With the DRBIII
t in Inputs/Outputs, read the A/C request state.
Does the A/C request state change?
All
Yes
→ Go To 11
No
→ Repair the open in the A/C Request circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
11
Turn the ignition off.
Remove the A/C Clutch Relay.
Note: Check connectors - Clean/repair as necessary.
Measure the voltage of the (A17) Fused B+ circuit at the A/C Clutch Relay connector.
Is the voltage above 11.0 volts?
All
Yes
→ Go To 12
No
→ Repair the open in the (A17) Fused B+ circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
12
If there are no possible causes remaining, view repair.
All
Repair
Replace the A/C Clutch Relay.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
13
Turn the ignition off.
Disconnect the A/C - Heater Control C1 harness connector.
Ignition on, engine not running.
Measure the voltage between the A/C On/Off Control circuit and ground.
Is the voltage greater than 11.0 volts?
All
Yes
→ Go To 14
No
→ Go To 15
14
Turn the ignition off.
Disconnect the A/C - Heater Control C1 harness connector.
Ignition on, engine not running.
With the DRBIII
t in BCM, select Inputs/Outputs.
Monitor the A/C Select Switch state while connecting a jumper wire between ground
and the A/C On/Off Control circuit in the A/C - Heater Control C1 harness connector.
Does the A/C Select Switch state change from
9Off9 to 9On9 when the jumper wire is
connected.
All
Yes
→ Replace the A/C - Heater Control Module in accordance with the
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace and program the Body Control Module per Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
272
DRIVEABILITY - NGC
*CHECKING A/C SYSTEM OPERATION WITH NO DTCS —
Continued
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