SAFARI

AIRCONDITIONING

C. TROUBLESHOOTINGON COOLER ELECTRICAL CIRCUIT

1. Troubleshooting Flow Chart

After making sure that the blower circuit operation is good, troubleshoot the cooler circuit in the following

procedures.

STEP 1 CHECK A/C SWITCH FUNCTION

STEP 2 CHECK MAGNETIC CLUTCH

STEP 3 CHECK POWER SOURCE TO CLUTCH

STEP 4 CHECK MAGNETIC CLUTCH RELAY

STEP 5 CHECK OUTPUT FROM AMPLIFIER

STEP 6 CHECK INPUT TO AMPLIFIER

With blower operated, push on

A/C switch, and check whether

A/C switch lamp is lit.

With A/C switch and blower

switches On, check whether

magnetic clutch is On.

Yes

Check voltage of 1-pole connec-

tor for the magnetic clutch.

Check voltages to clutch relay

Connector

No Battery Voltage

or No Grounding

Check output voltage from

amplifier.

Terminal 1A – OK

No Good

Inspect

A/C fuse

Blown or

Bad Contact

Check wiring between

A/C fuse and the blower

circuit.

Check magnetic clutch

coil.

Step 4-1

Check relay and its wiring

Check continuity of wiring

between amplifier and mag-

netic clutch relay.

Check input

voltage to

A/C fuse

12V

Replace it

Check

A/C

switch

Check condenser

Fan relay circuit

12V

Check each input voltage and sig-

nal from sensor such as Ther-

mistor, Dual Pressure S/W Engine RPM

signal from eng. ECU. Also

check the earth circuit for amplifier.

Replace amplifier

Check sensor and its wiring,

which don't input correct sig-

nal.

Important

Also A/C idle up check should be done Visu-

allsy regardless of above troubleshooting result,

No Good