Checking wiring and components: Notes
Check engine coolant temperature (ECT) sensor resistance.
The engine coolant temperature (ECT) sensor may be defective as a result of the signal cable having been short-circuited to supply voltage. Check this before replacing the sensor.
Check the signal cable between control module #A4 (#A4) engine coolant temperature (ECT) sensor #1 for an open-circuit according to Open-circuit, permanent faults and a short-circuit to supply voltage according to Short-circuit to supply voltage. Permanent faults
HINT: With the ignition on and engine coolant temperature (ECT) sensor connector disconnected the voltage between #1 and ground terminal must be approximately 5V.
Check ground lead between control module #A60 (#A60) and engine coolant temperature (ECT) sensor #2 for an open-circuit according to Open-circuit, permanent faults
Remedy as necessary.
Other information
- Connecting the breakout box/accessing the control module, see Connecting the breakout box .
- To access the engine coolant temperature (ECT) sensor, see Engine temperature sensor .
- For resistance values, see Resistance values .
- For information about signals:
- For 5 cylinder turbocharged engines -2001, see Signal specification
- For 5 cylinder turbocharged engines 2002, see Signal specification
- For B5254T2 -2004, see Signal description
- For B5204T5, B5234T3, B5234T7 and B5244T3 -2004, see Signal specification (B5204T5, B5234T3, B5234T7 and B5244T3 -2004)
- For B5254T4 2004, see Signal specification (B5254T4 2004)
- For 5 cylinder turbocharged engines 2005-, see Signal specification .
- Continue
Refer to Verification