ECU information available
Actuator test: no OK
Measure parameters: yes
Characterised by
- Short circuit to positive or open circuit
- Short circuit to earth
- Coherence
Checks to be carried out if fault is present
Short circuit to positive or open circuit
| conditions under which the fault appears | checks to be made conditions for checking |
|---|---|
| engine running voltage measured between terminals 47 and 53 of the engine control unit greater than 5 V | ignition off, engine ECU: disconnected, engine coolant temperature sensor: disconnected: - check continuity of wires A, B ignition on, engine ECU: connected; engine coolant temperature sensor: disconnected: - check the presence of 5 V: between terminals 47 and 53 on the control unit check the value of the resistance at different temperature thresholds |
Short circuit to earth
| conditions under which the fault appears | checks to be made conditions for checking |
|---|---|
| engine running voltage measured between terminals 47 and 53 of the engine control unit equal to 0 V | ignition on, engine ECU: connected, engine coolant temperature sensor: disconnected: - check the presence of 5 V: between terminals 47 and 53 on the control unit |
Coherence
| conditions under which the fault appears | checks to be made conditions for checking |
|---|---|
| engine running: after an operating time specified in calibration, the coolant temperature is below 10 degrees C engine running: inconsistent rise in coolant temperature measured by the control unit | engine running: - check the consistency of the signal perceived by the ECU (measure parameters) ignition off, engine ECU: disconnected: - check: resistance R1 of the coolant temperature sensor between terminals 47 and 53 of the engine control unit check the value of the resistance at different temperature thresholds |
Check(s) to be carried out if no fault found
Check the consistency of the signal perceived by the ECU (measure parameters)
