| Test | Tester | Check | Notes | Nominal | ||
|---|---|---|---|---|---|---|
| Step | Multimeter MKM-587-A | of | between | Value | ||
| 11 | Voltmeter range 20 V, DC | Voltage supply, compressor relay K60 | ||||
| K60/Ter. 86 (2) | Ground | · Disconnect relay K60 | ||||
| · Ignition ON | » 11.5 V | |||||
| Ohmmeter range 200 W | K60/Ter. 85 (6) | X4 (4/bushing) | · Ignition OFF | |||
| · Separate wiring harness plug X4*) | » 0 W | |||||
| K60/Ter. 87 (8) | Wiring harness plug Y1 (BRBL/ brown-blue) | |||||
| · Disconnect K60 |
Separate wiring harness plug of Y1
| » 0 W | ||||
|---|---|---|---|---|
| K60/Ter. 30 (4) | X6 (54/pin) | |||
| · Ignition OFF | ||||
| · Separate wiring harness plug X6 *) | » 0 W | |||
| K60/Ter. 30 (4) | Wiring harness plug S20 (2) | · Disconnect relay K60 |
· Disconnect wiring harness plug from S20
| » 0 W |
*) For this, remove storage tray on passenger side and right A pillar inner panelling.
Note:
Compressor relay K60 switches the compressor magnetic clutch Y1 on if the following conditions are fulfilled:
- Compressor clutch can only be engaged when the engine is running.
- Engine running at nominal idle speed, operating temperature.
- Ambient temperature > 4 °C/40 °F.
- Air conditioning switched on.
- Low pressure in refrigerant circuit > 180 kPa (1.8 bar).
- High pressure in refrigerant circuit < 3000 kPa (30 bar).
- Vehicles with C 14 NZ engine and power steering: power steering pressure switch S61 closed.
- Pressure at switch S61 < 4000 kPa (40 bar).
Possible cause of fault, trouble-shooting
1. Fuse F17/10A defective.
2. Lead interruption between X6 (61/bushing) and output fuse F17/10A.
3. Lead interruption between X6 (61/pin) and compressor relay K60/Ter. 86 (2).
4. Lead interruption between compressor relay K60/Ter. 85 (6) and X6 (60/pin).
5. Lead interruption between X6 (60/bushing) and X4 (4/bushing).
6. Lead interruption between X4 (4/pin) and control unit, MULTEC; X 14 XE, X 16 XE: K91 (A15); C 14 SE: K91 (A10); C 14 NZ: K57 (A2).
7. Lead interruption between compressor relay K60/Ter. 30 (4) and power steering pressure switch S61 (B). **)
8. Lead interruption between power steering pressure switch S61 (A) and X6 (54/pin) or pressure switch ASSY. S20 (2). **)
9. Lead interruption between compressor relay K60/Ter. 87 (8) and wiring harness plug for compressor magnetic coupling Y1 (BRBL/brown-blue).
10. Control unit, MULTEC-S (MUL), MULTEC (MUL) or MULTEC-M (MUL) defective *).
11. Power steering pressure switch S61 defective - see test step 19 **).
*) Carry out quick check F0:DATA LIST with TECH 1.
**) Only C 14 NZ with power steering
( ) Terminal in wiring harness plug
(A) Positive side terminal in wiring harness plug
(B) Negative side terminal in wiring harness plug
( ) Terminal in wiring harness plug