| Test | Tester | Check | Notes | Nominal | |
|---|---|---|---|---|---|
| Step | Multimeter MKM-587-A | of | between | Value | |
| 15 | Voltmeter range 20 V, DC | Voltage supply, coolant temperature switch S128 | |||
| Wiring harness plug S128/Ter. 2 (BRWS/ brown- white) | Ground | · Disconnect wiring harness plug from switch S128 *) | |||
| · Ignition ON | » 11.5 V | ||||
| Ohmmeter range 200 W | Wiring harness plug S128/Ter. 1 (BRGE/ brown- yellow) | ||||
| Wiring harness plug Y1 (BRGE/ brown- yellow) | |||||
| · Ignition OFF |
· Disconnect wiring harness plug from switch S128 *)
| · Separate wiring harness plug Y1 | » 0 W | ||
|---|---|---|---|
| Wiring harness plug S128/Ter. 3 (BR/brown) | |||
| Ground | » 0 W | ||
| Passage check of | S128/Ter. 2 | ||
| S128/Ter. 3 | |||
| · Ignition OFF | |||
| · Disconnect wiring | ¥ W | ||
| coolant temperature switch S128 | |||
| S128/Ter. 1 | S128/Ter. 3 | harness plug from S128 *) | |
| · Engine cold | » 0 W | ||
| Possible cause of fault, trouble-shooting |
1. Fuse F17/10A defective.
2. MAXI fuse F15/30A defective.
3. Lead interruption between coolant temperature switch S128 (2) and radiator fan relay K52/Ter. 85 (6).
4. Lead interruption between coolant temperature switch S128 (2) and radiator fan relay K67/Ter. 85 (6).
5. Lead interruption between coolant temperature switch S128 (3) and grounding point 2.
6. Lead interruption between coolant temperature switch S128 (1) and wiring harness plug for compressor magnetic clutch Y1 (BRGE/brown-yellow).
7. Compressor magnetic clutch Y1 defective - see test step 03.
8. Coolant temperature switch S128 defective.
9. Radiator fan relay K52 defective - see test step 13.
10. Radiator fan relay K67 defective - see test step 12.
*) For this, remove front panelling
( ) Terminal in wiring harness plug