Jeep XJ. Manual — part 628
TEST
ACTION
APPLICABILITY
6
Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the Needle Movement Sensor harness connector.
Measure the resistance between ground and the Needle Movement Sensor Signal
circuit.
Is the resistance above 100 kohms?
All
Yes
→
No
→
Repair the Needle Movement Sensor Signal circuit for a short to
ground.
Perform ROAD TEST VERIFICATION - VER-2.
7
Turn the ignition off.
Replace the Needle Movement Sensor in accordance with the Service Information.
Turn the ignition on.
With the DRB, erase ECM DTCs.
Start the engine and vary the engine speed from idle to 3500 RPM several times.
With the DRB, read ECM DTCs.
Did this DTC reset?
All
Yes
→
Replace and program the Engine Control Module in accordance
with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
The repair is complete.
Perform ROAD TEST VERIFICATION - VER-2.
8
WARNING: KEEP CLEAR OF THE ENGINE’S MOVING PARTS.
NOTE: The conditions that set the DTC are not present at this time. The
following list may help in identifying the intermittent condition.
With the engine running at normal operating temperature, monitor the DRB
parameters related to the DTC while wiggling the wiring harness. Look for param-
eter values to change and/or a DTC to set.
Review the DTC When Monitored and Set Conditions. If possible, try to duplicate the
conditions under which the DTC was set.
Refer to any Technical Service Bulletins (TSB) that may apply.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wiring harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Were any of the above conditions present?
All
Yes
→
Repair as necessary
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Test Complete.
164
DRIVEABILITY - DIESEL
P1725-INDUCTIVE AUX. SPEED SENSOR DYN. PLAUSIBILITY —
Continued
Symptom:
*CHECKING THE A/C SYSTEM
POSSIBLE CAUSES
A/C COMPRESSOR CLUTCH
A/C COMPRESSOR CLUTCH GROUND CIRCUIT OPEN
A/C COMPRESSOR CLUTCH RELAY OUTPUT CIRCUIT OPEN
A/C HIGH PRESSURE SWITCH OPEN
A/C LOW PRESSURE SWITCH OPEN
A/C PRESSURE SENSE CIRCUIT OPEN
A/C SELECT SWITCH SENSE CIRCUIT OPEN
A/C SELECT SWITCH SENSE CIRCUIT SHORT TO GROUND
A/C SELECT SWITCH SENSE CIRCUIT SHORT TO VOLTAGE
A/C SWITCH INPUT TO THE PCM
A/C SWITCH SIGNAL OPEN
A/C SWITCH SIGNAL SHORTED TO GROUND
ACTUATOR TEST
ECM
ECM - PRESSURE SIGNAL OPEN
FUSED B+ CIRCUIT OPEN
GROUND CIRCUIT OPEN
HI PRESSURE SIGNAL CIRCUIT OPEN
PCM - A/C SELECT SWITCH SENSE CIRCUIT OPEN
PCM - A/C SWITCH INPUT
PCM - INTERNAL A/C SELECT SWITCH CIRCUIT
TEST
ACTION
APPLICABILITY
1
NOTE: Prior to diagnosing the A/C electrical system, check for proper A/C
system pressure. Improper refrigerant charge can cause incorrect system
diagnosis and unnecessary component replacement.
NOTE: Refer to the Service Information to check the A/C mechanical system
before continuing.
With the DRB, select Engine, JTEC then Inputs/Outputs.
Start the engine and set the blower to Panel.
Turn the A/C on.
With the DRB, read the A/C Select Switch.
Does the DRB display A/C Select Switch YES?
All
Yes
→
No
→
165
DRIVEABILITY - DIESEL
TEST
ACTION
APPLICABILITY
2
With the DRB, select Engine, Bosch Controller then Inputs/Outputs.
Start the engine and set the blower to Panel.
Turn the A/C on.
With the DRB, read the A/C Switch.
Does the DRB display A/C Switch ON?
All
Yes
→
No
→
3
Turn the ignition on.
With the DRB, select Engine, Bosch Controller then Inputs/Outputs.
Read the A/C H/L Press Sw
Does the DRB display A/C H/L Press Sw ON?
All
Yes
→
No
→
4
Turn the ignition on.
With the DRBIII
t, actuate the A/C Compressor Clutch Relay.
Observe the A/C Compressor Clutch during actuation.
Is the A/C Compressor Clutch clicking?
All
Yes
→
The electrical portion of the A/C System is operating properly.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
5
Remove the A/C Compressor Clutch Relay from the PDC.
Using a 12-volt test light connected to ground, check the Fused B+ circuit.
Is the test light on?
All
Yes
→
No
→
Repair the Fused B+ circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
6
Remove the A/C Compressor Clutch Relay from the PDC.
Disconnect the A/C Compressor Clutch harness connector.
Connect a jumper wire across the A/C Compressor Clutch Relay connector cavities 30
and 87 in the PDC.
Using a 12-volt test light connected to ground, check the A/C Compressor Clutch
Relay Output circuit in the A/C Compressor Clutch harness connector.
Is the test light on?
All
Yes
→
No
→
Repair the A/C Compressor Clutch Relay Output circuit for an
open.
Perform ROAD TEST VERIFICATION - VER-2.
7
Disconnect the A/C Compressor Clutch harness connector.
Using a 12-volt test light connected to 12 volts, check the A/C Compressor Clutch
Ground circuit.
Is the test light on?
All
Yes
→
Replace the A/C Compressor Clutch in accordance with the
Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Repair the A/C Compressor Clutch Ground circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
166
DRIVEABILITY - DIESEL
*CHECKING THE A/C SYSTEM —
Continued
TEST
ACTION
APPLICABILITY
8
Turn the ignition on.
Connect one end of a jumper wire to ground and back probe the A/C Pressure Signal
circuit at the ECM harness connector.
With the DRB, select Engine, Bosch Controller then Inputs/Outputs.
Read the A/C H/L Press Sw.
Does the DRB display A/C H/L Press Sw ON?
All
Yes
→
No
→
Replace and program the ECM in accordance with the Service
Information.
Perform ROAD TEST VERIFICATION - VER-2.
9
Disconnect the A/C High Pressure Switch harness connector.
Turn the ignition on.
Connect one end of a jumper wire to ground and back probe the A/C Pressure Signal
circuit at the A/C High Pressure Switch harness connector.
With the DRB, select Engine, Bosch Controller then Inputs/Outputs.
Read the A/C H/L Press Sw.
Does the DRB display A/C H/L Press Sw ON?
All
Yes
→
No
→
Repair the A/C Pressure Signal circuit for an open between the
ECM and the A/C High Pressure Switch.
Perform ROAD TEST VERIFICATION - VER-2.
10
Turn the ignition off.
Disconnect the A/C High Pressure Switch harness connector.
Measure the resistance of the A/C High Pressure Switch.
Is the Resistance below 10.0 ohms?
All
Yes
→
No
→
Replace the A/C High Pressure Switch.
Perform ROAD TEST VERIFICATION - VER-2.
11
Disconnect the A/C Low Pressure Switch harness connector.
Turn the ignition on.
Connect one end of a jumper wire to ground and the other end to the A/C Pressure
Sense circuit at the A/C Low Pressure Switch harness connector.
With the DRB, select Engine, Bosch Controller then Inputs/Outputs.
Read the A/C H/L Press Sw.
Does the DRB display A/C H/L Press Sw ON?
All
Yes
→
No
→
Repair the A/C Pressure Sense circuit for an open between the
A/C High Pressure Switch and the A/C Low Pressure Switch.
Perform ROAD TEST VERIFICATION - VER-2.
12
Turn the ignition off.
Disconnect the A/C Low Pressure Switch harness connector.
Measure the resistance of the A/C Low Pressure Switch.
Is the Resistance below 10.0 ohms?
All
Yes
→
Repair the ground circuit at the A/C Low Pressure Switch for an
open.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Replace the A/C Low Pressure Switch.
Perform ROAD TEST VERIFICATION - VER-2.
167
DRIVEABILITY - DIESEL
*CHECKING THE A/C SYSTEM —
Continued
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