Hvac Systems - Manual - GMC chevrolet camaro 2000 Service Manual

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HVAC Systems - Manual HVAC
HVAC Compressor Clutch Does Not Engage (cont'd)
Step
Action Value(s)
Yes
No
Test for and repair a poor connection at the PCM and at
the engine wiring harness junction block 2. Refer to
20
Testing for Intermittent and Poor Connections and
-
Connector Repairs in Wiring Systems.
Did you complete the repair? Go to Step24 Go to Step 21
Replace the PCM. Refer to PCM
21
Replacement/Programming (V6) or PCM
-
-
Replacement/Programming (VB) in Engine Controls.
Did you complete the replacement? Go to Step 24
Replace the heater-A/C control. Refer to Control Assembly
22
Replacement. -
-
Did you complete the replacement?
Go to Step 24
Replace the A/C compressor clutch coil. Refer to
Compressor Clutch Coil Removal (V5 - Conventional
Mount) and Compressor Clutch Coil Install
23
(V5 - Conventional Mount) (V6) or Compressor Clutch Coil
-
-
Removal (V7 - Direct Mount) and Compressor Clutch Coil
Install (V7 - Direct Mount) (VB).
Did you complete the replacement? Go to Step 24
24
Operate the system in order to verify the repair.
-
Did you correct the condition? System OK Go to Step 3
HVAC Compressor Clutch Does Not Disengage
Step Action Value(s) Yes No
DEFINITION: A/C compressor clutch will not disengage when no A/C request has been made and no Powertrain DTCs
are set.
Did you perform the Diagnostic System Check? Goto
A
1
-
Diagnostic
Go to Step 2 System Check
1. Disconnect the Powertrain Control Module (PCM)
2
connector C2.
2. Turn the ignition switch to the RUN position.
-
Does the A/C compressor clutch coil disengage? Go to Step
3
Go to Step 4
Replace the Powertrain Control Module (PCM). Refer to
3
PCM Replacement/Programming (V6) or PCM
Replacement/Programming (VB) in Engine Controls.
-
-
Did you complete the replacement?
Go to Step 11
1. Disconnect the A/C CLU relay from the underhood
4
accessory wiring junction block.
-
2. Turn the ignition switch to the RUN position.
Does the A/C compressor Clutch coil disengage? Go to Step 5 Go to Step 8
1. Turn the ignition switch to the OFF position.
2. Powertrain Control Module (PCM) connector C2 still
disconnected.
3. A/C clutch relay still removed from the engine wiring
harness junction block 2.
5
4. Connect a DMM between the Powertrain Control
-
Module (PCM) connector C2 terminal 39 and ground.
5.
Measure for.continuity in the control circuit of the
A/C compressor .relay to ground.
Is the air conditioning compressor coil control relay output
circuit continuous to ground?
Go to Step 6 Go to Step 7
Repair a short to ground in the control circuit of the
A/C compressor relay between the engine wiring harness
6
junction block 2 and the PCM connector C2. Refer to
- -
Wiring Repairs in Wiring Systems.
Did you complete. the repair? Go to Step 11
(
Replace the A/C clutch relay. Refer to Compressor Relay
7 Replacement in Heating, Ventilation, and Air Conditioning.
-
-
Did you complete the replacement? Go to Step 11