Test Point 11

Test point 11
A/C

Signal implausible

Fault code 30


NOTE: This fault can be determined only during the system test.

Signal implausible
1. Check refrigerant pressure.
2. Check high/low pressure switch.
Battery positive voltage must be present at terminal 1 on the high/low pressure switch (with ignition on) if there is sufficient refrigerant in the system.
3. Check the heating activation relay.
Battery positive voltage must be present at terminal 87 when the ignition is switched on.
4. Check the air-conditioning compressor relay.
Battery positive voltage must be present at terminal 30 (with the ignition on) and the high/low pressure switch actuated. Terminal 31 must be connected to ground.
Battery positive voltage must be present at terminal 86 when the engine is started.
Terminal 85 must be connected to ground when the DME switches on the air-conditioning compressor (7-second delay).
5. Unplug connector D from the heating/air-conditioning control.
6. Unplug the DME (ECM) connector.
7. Connect ohmmeter to D 6 and DME connector pin 69.
Display: [<] 5 Ohms

NOTE: The wire is routed via two plug connections.

8. Remove the air-conditioning compressor relay.
9. Connect ohmmeter to terminal 85 and DME connector pin 62.
Display: [<] 5 Ohms

NOTE: The wire is routed via one plug connection.