A/C System Inspection Of Ecm And Its Circuits - MARUTI SUZUKI Maruti 800 Service Manual

1B-12 AIR CONDITIONING (OPTIONAL)
Fig. A
Fig. B
TERMINAL ARRANGEMENT OF ECM COUPLER (VIEWED FROM HARNESS SIDE)
A/C SYSTEM INSPECTION OF ECM AND ITS
CIRCUITS
ECM and its Circuits can be checked at ECM wiring couplers by
measuring voltage.
CAUTION:
ECM cannot be checked by itself. It is strictly prohibited
to connect voltmeter or ohmmeter to ECM with couplers
disconnected from it.
Voltage Check
1) Remove ECM from vehicle.
2) Connect ECM couplers (2) to ECM (1).
3) Check voltage at each terminal of couplers connected.
Refer to "Inspection of ECM and its circuit" in ENGINE AND
EMISSION CONTROL SYSTEM section.
NOTE:
As each terminal voltage is affected by the battery voltage,
confirm that it is 11V or more when ignition switch is ON.
1. Blower fan motor
2. ECM
3. Dual pressure switch
4. A/C switch
5. A/C evaporator thermistor
6. ECT sensor
7. Radiator fan relay
8. Radiator fan
9. Compressor
10. Main relay
11. Engine earth
12. Blower fan motor switch
13. Compressor relay
A. To HTR fuse 15A
B. To A/C fuse 10A
C. To RDTR fuse 30A
D. To IG fuse 15A
E. To FI fuse 15A