Cooling system
Cooling system |
FAN VARIANT |
1. |
Plug in the scan tool and select "READ FAULT CODES" from the menu. If any trouble codes are present, continue on
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4. |
Unplug the radiator fan connector and check that:
1-speed fan |
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a 12 V power supply is present between pin 1 and a good grounding point.
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resistance between pin 2 and a good grounding point is less than 1 ohm.
Also check that: 2-speed fan |
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a 12 V power supply is present between pin 1 of the connector and a good grounding point.
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5. |
If not, check the leads for breaks/shorting, as follows:
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between pin 87 of the relay holder connector and pin 1 of the 1-speed radiator fan connector.
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between pin 87 of the relay holder connector and pin 1 of the 2-speed radiator fan connector.
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6. |
If the radiator fan still does not work in spite of the above checks, change the radiator fan motor.
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A/C pressure switch |
2. |
If this is not the case, disconnect the pressure switch, connect a jumper lead between the connector pins and repeat point 1.
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3. |
If this does not work, connect a BOB and check the leads for breaks/shorting as follows:
Pressure switch 1 |
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between ICE connector pin 22 and pressure switch connector pin 3.
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between pressure switch connector pin 4 and a good grounding point.
Pressure switch 2 |
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between ICE connector pin 69 and pressure switch connector pin 1.
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between pressure switch connector pin 2 and a good grounding point.
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4. |
If there is no fault in the wiring, change the pressure switch.
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Cooling system temperature |
1. |
Select "READ FAULT CODES" from the scan tool menu. If any diagnostic trouble codes are present, continue on
.
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4. |
If the voltage readings are not OK, check the wiring for breaks/shorting as follows:
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between pin 61 of the ICE module connector and pin 4 of the main instrument display panel connector (12p-1 main instrument display panel 1).
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between pin 14 of the ICE module connector and pin 7 of the main instrument display panel (main instrument display panel 2).
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5. |
If the leads are OK, the fault is probably in one of the control modules.
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6. |
Plug in the ICE control module connector and repeat points 2 and 3 while grounding connector pin 4 (12p-1 main instrument display panel 1) or connector pin 7 (main instrument display panel 2) at the same time.
The voltage reading obtained should be 0 V with the ignition switch "ON" and 12 V with it "OFF". If the voltage reading is OK, the fault is probably in the main instrument display panel. Continue fault diagnosis as described in Service Manual 3:5 "Electrical system, Main instrument display panel". |
Checking the idling speed increase (MOTRONIC 2.10.2 only) |
1. |
Plug in the scan tool and select "READ FAULT CODES" from the menu. If any trouble codes are present, continue on
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3. |
If this is does not work, check the wiring between the ICE control module and the engine management system control module (both control modules unplugged) for breaks/shorting.
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