| Test | Tester | Check | Notes | Nominal | ||
|---|---|---|---|---|---|---|
| Step | Multimeter MKM-587-A | of | between | Value | ||
| 13 | Voltmeter range | Voltage supply, | K52/Ter. 86 (4) | Ground | · Disconnect relay K52 | |
| · Ignition ON | » 11.5 V | |||||
| 20 V, DC | radiator fan relay K52 | |||||
| K52/Ter. 30 (2) | Ground | · Switch S101 ON | » 11.5 V | |||
| Ohmmeter range | K52/Ter. 87 (8) | Ground | · Ignition OFF | |||
| · Disconnect relay K52 | » 0 W | |||||
| 200 W | K52/Ter. 85 (6) | Ground | · Disconnect wiring harness plug from switch S20 |
· Bridge contacts 3 and 4 in wiring harness plug S20
| » 0 W | |||
|---|---|---|---|
| Voltmeter range 20 V, DC | K52/Ter. 87A (5) | Ground | · Disconnect relay K52 |
· Disconnect wiring harness plug from switch S128*)
· Bridge contacts 2 and 3 of wiring harness plug for switch S128
· Ignition ON
· Important: radiator fan motor M4 starts running
| » 11.5 V |
|---|
| Possible cause of fault, trouble-shooting |
1. Fuse F17/10A defective.
2. Fuse F20/30A defective.
3. Lead interruption between radiator fan relay K52/Ter. 86 (4) and X6 (61/pin).
4. Lead interruption between X6 (61/bushing) and fuse F17/10A.
5. Lead interruption between radiator fan relay K52/Ter. 30 (2) and radiator fan relay K51/Ter. 87 (8).
6. Lead interruption between radiator fan relay K52/Ter. 30 (2) and X44 (1/pin).
7. Lead interruption between X44 (1/bushing) and radiator fan relay and AC fan motor, 1st speed, K26/Ter. B (5).
8. Lead interruption between radiator fan relay K51/Ter. 30 (4) and auxiliary fan motor M11 (BRWS/brown-white).
9. Lead interruption between X44 (2/pin) and auxiliary fan motor M11 (BRWS/brown-white).
10. Lead interruption between radiator fan relay K52/Ter. 87 (8) and grounding point 2.
11. Lead interruption between radiator fan relay K52/Ter. 87A (5) and radiator fan motor M4 (RTWS/red-white).
12. Radiator fan motor M4 defective - see test step 01.
13. Lead interruption between radiator fan motor M4 (BR/brown) and grounding point 2.
14. Lead interruption between radiator fan relay K52/Ter. 85 (6) and coolant temperature switch S128 (2).
15. Lead interruption between radiator fan relay K52/Ter. 85 (6) and pressure switch ASSY. S20 (4).
16. Pressure switch ASSY. S20 defective - see test step 06.
17. Lead interruption between pressure switch ASSY. S20 (3) and grounding point 2.
18. Coolant temperature switch S128 defective - see test step 15.
19. Lead interruption between coolant temperature switch S128 (3) and grounding point 2.
*) For this, remove front panelling
( ) Terminal in wiring harness plug