Workshop Manual

6E–67
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
A/C Clutch Control Circuit Diagnosis (Cont'd)
Step NoYesValue(s)Action
32 1. A/C compressor relay removed.
2. Connect a fused jumper at the A/C compressor
relay socket with either wire.
3. Engine idling.
4. A/C “ON”.
5. Blower “ON”.
Did the compressor magnetic clutch engage?
— Go to Step 33 Go to Step 34
33 Repair the A/C compressor relay.
Is the action complete?
— Verify repair —
34 Check for an open circuit between the A/C compressor
relay and the A/C clutch.
Was an open circuit found?
— Go to Step 35 Go to Step 36
35 Repair the open circuit between the compressor Clutch
and the A/C compressor relay.
Is the action complete?
— Verify repair —
36 Service the compressor clutch or replace the
compressor due to a faulty internal overheat switch.
Is the action complete?
— Verify repair —
37 1. Remove the A/C compressor relay.
2. Idle the engine.
Is the compressor clutch still engaged when A/C is not
selected?
— Go to Step 38 Go to Step 39
38 Repair the short to voltage between the A/C clutch and
A/C compressor relay.
Is the action complete?
— Verify repair —
39 1. Reinstall the A/C compressor relay.
2. Remove the A/C thermostat relay.
3. Engine idling.
Is the compressor clutch still engaged when A/C is not
selected?
— Go to Step 40 Go to Step 42
40 Use a DVM to check for a short to ground between the
A/C compressor relay and F4 of the PCM.
Was a short detected?
— Go to Step 41 Go to Step 25
41 Repair the short to ground between the PCM and A/C
compressor relay.
Is the action complete?
— Verify repair —
42 Repair the short to ground between the A/C thermostat
relay and the electronic thermostat.
Is the action complete?
— Verify repair —