Jeep Wrangler TJ. Manual — part 119
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Disconnect the C3 PCM harness connector.
Measure the resistance between ground and the (C18) A/C Pressure Signal circuit in
the A/C Pressure Sensor harness connector.
Is the resistance below 100 ohms?
All
Yes
→ Repair the short to ground in the (C18) A/C Pressure Signal
circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
No
→ Go To 5
5
Measure the resistance between the (C18) A/C Pressure Signal circuit and the (K900)
Sensor ground circuit in the A/C Pressure Sensor harness connector.
Is the resistance below 100 ohms?
All
Yes
→ Repair the short between the (K900) Sensor ground circuit and
the (C18) A/C Pressure Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
No
→ Go To 8
6
Turn the ignition off.
Disconnect the C1 and C3 PCM harness connectors.
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 (F856) 5-volt Supply circuit from the A/C Pressure
Sensor harness connector to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 7
No
→ Repair the open in the (F856) 5-volt Supply circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
7
Measure the resistance between ground and the (F855) 5-volt Supply circuit in the
A/C Pressure Sensor harness connector.
Is the resistance below 100 ohms?
All
Yes
→ Repair the short to ground in the (F856) 5-volt Supply circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
No
→ Go To 8
8
NOTE: Before continuing, check the PCM harness connector terminals for
corrosion, damage, or terminal push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay
particular attention to all Power and Ground circuits.
If there are no possible causes remaining, view repair.
All
Repair
Replace and program the Powertrain Control Module per Service
Information.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
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DRIVEABILITY - NGC
P0532-A/C PRESSURE SENSOR LOW —
Continued
Symptom:
P0533-A/C PRESSURE SENSOR HIGH
When Monitored and Set Condition:
P0533-A/C PRESSURE SENSOR HIGH
When Monitored:
Engine running, A/C is Learned, and the AC Clutch Relay energized.
Set Condition:
The A/C pressure sensor signal at the PCM goes above 4.92 volts for 2.6
seconds. One trip Fault.
POSSIBLE CAUSES
A/C PRESSURE SENSOR VOLTAGE ABOVE 4.6 VOLTS
A/C PRESSURE SENSOR
(C18) A/C PRESSURE SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
(C18) A/C PRESSURE SIGNAL CIRCUIT OPEN
(C18) A/C PRESSURE SIGNAL CIRCUIT SHORTED TO THE (K856) 5-VOLT SUPPLY
(K900) SENSOR GROUND CIRCUIT OPEN
PCM
TEST
ACTION
APPLICABILITY
1
NOTE: Make sure the A/C refrigerant System is properly charged per the
Service Information.
Start the engine.
With the DRBIII
t, read the A/C Pressure Sensor voltage.
Is the voltage above 4.6 volts?
All
Yes
→ Go To 2
No
→ Refer to the INTERMITTENT CONDITION Symptom (Diagnos-
tic Procedure).
Perform POWERTRAIN VERIFICATION TEST VER - 2.
2
Turn the ignition off.
Disconnect the A/C Pressure Sensor harness connector.
Connect a jumper wire between the (C18) A/C Pressure Signal circuit and the (K900)
Sensor ground circuit in the Sensor harness connector.
Ignition on, engine not running.
With the DRBIII
t, monitor the A/C Pressure Sensor voltage.
Is the voltage below 1.0 volt?
All
Yes
→ Replace the A/C Pressure Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
No
→ Go To 3
NOTE: Remove the jumper wire before continuing.
202
DRIVEABILITY - NGC
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the C1 and C3 PCM harness connectors.
Ignition on, engine not running.
Using a 12-volt test light connected to ground, probe the (C18) A/C Pressure Signal
circuit at the A/C Pressure Sensor harness connector.
Does the test light illuminate brightly?
All
Yes
→ Repair the short to voltage in the (C18) A/C Pressure Signal
circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
No
→ Go To 4
4
Turn the ignition off.
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 (C18) A/C Pressure Signal circuit from the A/C
Pressure Sensor harness connector to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 5
No
→ Repair the open in the (C18) A/C Pressure Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
5
Measure the resistance between the (C18) A/C Pressure Signal circuit and the (K855)
5-volt Supply circuit in the A/C Pressure Sensor harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→ Repair the short between the (F856) 5-volt Supply circuit and the
(C18) A/C Pressure Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
No
→ Go To 6
6
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 (K900) Sensor ground circuit from the A/C Pressure
Sensor harness connector to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 7
No
→ Repair the open in the (K900) Sensor ground circuit
Perform POWERTRAIN VERIFICATION TEST VER - 2.
7
NOTE: Before continuing, check the PCM harness connector terminals for
corrosion, damage, or terminal push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay
particular attention to all Power and Ground circuits.
If there are no possible causes remaining, view repair.
All
Repair
Replace and program the Powertrain Control Module per Service
Information.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
203
DRIVEABILITY - NGC
P0533-A/C PRESSURE SENSOR HIGH —
Continued
Symptom:
P0551-POWER STEERING SWITCH PERFORMANCE
When Monitored and Set Condition:
P0551-POWER STEERING SWITCH PERFORMANCE
When Monitored:
With the ignition key on and engine running.
Set Condition:
With the vehicle above 40 mph for over 30 seconds, the power steering
pressure switch remains open.
POSSIBLE CAUSES
GOOD TRIP EQUAL TO ZERO
POWER STEERING PRESSURE SWITCH
(K66) P/S SWITCH SIGNAL CIRCUIT OPEN
(K66) P/S SWITCH SIGNAL CIRCUIT SHORTED TO GROUND
(Z987) GROUND CIRCUIT OPEN
PCM
TEST
ACTION
APPLICABILITY
1
Ignition on, engine not running.
With the DRBIII
t, read DTCs and record the related Freeze Frame data.
Is the Good Trip Counter displayed and equal to zero?
All
Yes
→ Go To 2
No
→ Refer to the INTERMITTENT CONDITION Symptom (Diagnos-
tic Procedure).
Perform POWERTRAIN VERIFICATION TEST VER - 2.
2
Turn the ignition off.
Disconnect the Power Steering Pressure Switch harness connector.
Ignition on, engine not running.
Connect a jumper wire to the (K66) P/S Switch Signal circuit in harness connector.
Using the DRBIII
t, monitor the Power Steering Pressure Switch.
Touch the jumper wire to the (Z987) Ground circuit in the Power Steering Pressure
Switch harness connector several times.
Did the Power Steering Pressure Switch status change from High to Low?
All
Yes
→ Replace the Power Steering Pressure Switch.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
No
→ Go To 3
NOTE: Remove the jumper wire before continuing.
204
DRIVEABILITY - NGC
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