Jeep XJ. Manual — part 860
Symptom:
*CHECKING A/C SYSTEM OPERATION WITH NO DTC’S
POSSIBLE CAUSES
A/C CLUTCH RELAY OUTPUT CIRCUIT OPEN
A/C COMPRESSOR CLUTCH GROUND CIRCUIT OPEN
FUSED B(+) CIRCUIT OPEN
A/C CLUTCH COIL
A/C SELECT CIRCUIT OPEN
REFRIGERATION SYSTEM NOT PROPERLY CHARGED
A/C REQUEST CIRCUIT OPEN
CLUTCH CYCLING SWITCH
HIGH PRESS CUT-OFF SWITCH
LOW PRESSURE SWITCH
A/C CLUTCH RELAY
TEST
ACTION
APPLICABILITY
1
Ignition on, engine not running.
With the DRBIII
t, read DTC’s.
Is there an A/C Clutch Relay DTC?
All
Yes
→
No
→
2
Turn the ignition off.
Disconnect the A/C compressor clutch harness connector.
NOTE: Check connectors - Clean/repair as necessary.
Measure the resistance of the A/C Compressor Clutch Ground Circuit to ground.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the open A/C compressor clutch ground circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
3
Ignition on, engine not running.
With the DRBIII
t, read the A/C Select status.
Turn the A/C Switch on and off a few times.
Does the A/C Select state change?
All
Yes
→
No
→
Repair the open A/C Select Circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
201
HEATING & A/C
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Verify that the Refrigerant System is properly charged per service procedure.
Is the Refrigerant System properly charged?
All
Yes
→
No
→
Properly charge the Refrigerant System per the service informa-
tion.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
5
Turn the ignition on.
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
→
No
→
6
Turn the ignition off.
Disconnect the A/C compressor clutch harness connector.
NOTE: Check connectors - Clean/repair as necessary.
Measure the resistance of the A/C Compressor Clutch Ground Circuit to ground.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the open A/C compressor clutch ground circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
7
Ignition on, engine not running.
With the DRBIII
t, read the A/C Select status.
Turn the A/C Switch on and off a few times.
Does the A/C Select state change?
All
Yes
→
No
→
Repair the open A/C Select Circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
8
Turn the ignition off.
Verify that the Refrigerant System is properly charged per service procedure.
Is the Refrigerant System properly charged?
All
Yes
→
No
→
Properly charge the Refrigerant System per the service informa-
tion.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
9
Turn the ignition on.
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
→
No
→
202
HEATING & A/C
*CHECKING A/C SYSTEM OPERATION WITH NO DTC’S —
Continued
TEST
ACTION
APPLICABILITY
10
Turn the ignition off.
Verify the Clutch Cycling Switch operation per the service information.
Is the Clutch Cycling switch OK?
All
Yes
→
No
→
Replace the Clutch Cycling Switch.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
11
Turn the ignition off.
Verify the High Pressure Cut-Off Switch per the service information.
Is the High Pressure Cut-Off Switch OK?
All
Yes
→
No
→
Replace the High Pressure Cut-Off Switch.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
12
Turn the ignition off.
Verify the Low Pressure Switch operation per the service information.
Is the Low Pressure Switch OK?
All
Yes
→
No
→
Replace the Low Pressure Switch.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
13
Turn the ignition off.
Disconnect the A/C Clutch harness connector.
Remove the A/C Clutch Relay.
Note: Check connectors - Clean/repair as necessary.
Measure the A/C Clutch Relay Output from the Relay to the A/C Clutch Coil.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the open A/C Clutch Relay Output Circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
14
Ignition on, engine not running.
With the DRBIII
t, actuate the A/C clutch relay.
Measure the A/C Clutch Relay Output at the A/C Clutch harness connector.
Does the voltage fluctuate between 0.0 and 11.0 volts?
All
Yes
→
Replace the A/C Clutch Coil.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
15
Turn the ignition off.
Remove the A/C Clutch Relay.
Note: Check connectors - Clean/repair as necessary.
Measure the Fused B(+) at the Relay.
Is the voltage above 11.0 volts?
All
Yes
→
No
→
Repair the open Fused B(+) Circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
203
HEATING & A/C
*CHECKING A/C SYSTEM OPERATION WITH NO DTC’S —
Continued
TEST
ACTION
APPLICABILITY
16
If there are no possible causes remaining, view repair.
All
Repair
Replace the A/C Clutch Relay.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
17
Turn the ignition off.
Verify the Clutch Cycling Switch operation per the service information.
Is the Clutch Cycling switch OK?
All
Yes
→
No
→
Replace the Clutch Cycling Switch.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
18
Turn the ignition off.
Verify the High Pressure Cut-Off Switch per the service information.
Is the High Pressure Cut-Off Switch OK?
All
Yes
→
No
→
Replace the High Pressure Cut-Off Switch.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
19
Turn the ignition off.
Verify the Low Pressure Switch operation per the service information.
Is the Low Pressure Switch OK?
All
Yes
→
No
→
Replace the Low Pressure Switch.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
20
Turn the ignition off.
Disconnect the A/C Clutch harness connector.
Remove the A/C Clutch Relay.
Note: Check connectors - Clean/repair as necessary.
Measure the A/C Clutch Relay Output from the Relay to the A/C Clutch Coil.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the open A/C Clutch Relay Output Circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
21
Ignition on, engine not running.
With the DRBIII
t, actuate the A/C clutch relay.
Measure the A/C Clutch Relay Output at the A/C Clutch harness connector.
Does the voltage fluctuate between 0.0 and 11.0 volts?
All
Yes
→
Replace the A/C Clutch Coil.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
204
HEATING & A/C
*CHECKING A/C SYSTEM OPERATION WITH NO DTC’S —
Continued
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