929 V6-3.0L DOHC (1993)
Control Module HVAC: Testing and Inspection
Compressor Control (A/C Relay Signal) Inspection
Compressor Control (A/C Relay Signal) Inspection
VB: Battery voltage
Step 1
Idle-up control operation check
1. Turn the ignition switch ON and press the AUTO switch ON.
2. Press the DEF switch ON and set the blower switch at manual 1st speed. Verify that the engine speed increases.
3. If the idle-up control operates, go to Step 2.
4. If the idle-up control does not operate, go to Step 9.
Step 2
Fuse inspection
1. Check the indicated fuses.
2. If a fuse is burnt, replace it after checking and repairing the wiring harness as necessary.
3. If the fuses are OK, go to Step 3.
Step 3
A/C relay connector terminal voltage inspection