Checking The Wiring And Component

WARNING:

Before fault-tracing can begin, the engine cooling fan (FC) connector must be disconnected to prevent the engine cooling fan (FC) engaging. Diagnostic trouble code (DTC) ECM-6110 Engine cooling fan (FC) low-speed signal may be stored. After fault-tracing the connector must be reconnected.

Fig 1: Identifying Ignition OFF

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Ignition off.
Check the resistance of the engine coolant temperature (ECT) sensor between terminals #1 and #2 (component side).

Check the signal cable between control module terminal #A4 (#A4) and engine coolant temperature (ECT) sensor terminal #1. Check for a short-circuit to ground.

If no faults are found and the fault is permanent, replace the engine coolant temperature (ECT) sensor.

Remedy as necessary.

Other information:
- To connect the breakout box / access the control module, see CONNECTING THE BREAKOUT BOX
- For B5xx4T, see REPLACING THE THERMOSTAT AND/OR ENGINE COOLANT TEMPERATURE SENSOR
- For B6xx4T, see ENGINE COOLANT TEMPERATURE (ECT) SENSOR, REPLACING .
- For resistance values, see COMPONENT SPECIFICATIONS
- For 5 cylinder turbocharged engines -2004, see SIGNAL DESCRIPTION
- For 5 cylinder turbocharged engines 2005-, see SIGNAL SPECIFICATION .
- see CHECKING WIRING AND TERMINALS .
Fig 2: Identifying 2-Bit Connector
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Fig 3: Identifying Ohm Meter
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Fig 4: Identifying 2-Bit Connector Side View
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Refer to VERIFICATION