| Test | Tester | Check | Notes | Nominal | ||
|---|---|---|---|---|---|---|
| Step | Multimeter MKM-587-A | of | between | Value | ||
| 16 | Voltmeter range 20 V, DC | Voltage supply, engine speed increase pressure switch S109 (not C 14 NZ) | ||||
| Wiring harness plug of switch S109 (SW/black) | Ground | · Disconnect wiring harness plug from switch S109 | ||||
| · Ignition ON | » 11.5 V | |||||
| Ohmmeter range 200 W | Wiring harness plug of switch S109 (SWWS/ black-white) | X 4 (2/bushing) | · Ignition OFF |
· Disconnect wiring harness plug from switch S109
· Separate wiring harness plug X4 *)
| » 0 W | ||
|---|---|---|
| Ohmmeter range 200 W | Passage check, engine speed increase pressure switch S109 (not C 14 NZ) | |
| S109 Ter. A | S109 Ter. B | · Ignition OFF |
· Engine cold
| · Disconnect wiring harness plug from switch S109 | ¥ W |
|---|---|
| Possible cause of fault, trouble-shooting |
1. Lead interruption between engine speed increase pressure switch S109 (SWWS/black-white) and X6 (58/pin).
2. Lead interruption between X6 (58/bushing) and X4 (2/bushing).
3. Lead interruption between engine speed increase pressure switch S109 (SW(black) and X6 (61/pin).
4. Lead interruption between X6 (61/bushing) and output fuse F17/10A.
5. Engine speed increase pressure switch S109 defective.
6. Lead interruption between X4 (2/pin) and control unit, MULTEC-S X 14 XE, X 16 XE: K91 (B5); C 14 SE: MULTEC-M K91 (D6).
7. Control unit, MULTEC-S (MUL), MULTEC (MUL) or MULTEC-M (MUL) defective (if engine idle speed does not increase when the air conditioning is switched on and a pressure > 1100 kPa (11 bar) in refrigerant circuit).
*) For this, remove storage tray on passenger side and lower right A pillar inner panelling.
( ) Terminal in wiring harness plug