Fault Conditions

Engine Coolant Temperature Sensor Circuit. Short to B+ / Open circuit.







Fault symptoms
- CHECK ENGINE.
- A/C malfunctioning.
- Radiator fan running continuously when ignition is ON.
- Temperature gauge displaying incorrect value.
- Misfiring can occur before trouble code is generated.

On-Board Diagnostics
Type of diagnosis:
- Continuous. But interrupted when fault criteria fulfilled and will not restart until next driving cycle.

Enable criteria:
- Engine running.

Fault criteria:
- Voltage higher than 4.910 V for more than 1 s.

Dependents:
- None.

System reaction to a fault:
- A substitute value is continually calculated according to the following method: Intake air temperature at start is incremented 1° per 60 g air mass/sec. The value is maximized to 90 °C and is used as soon as the fault criteria for the sensor is fulfilled.

OK report:
- P0116 Test 1 and Test 2 performed once and fault criteria not fulfilled. Fault criteria for P0117 or P0118 not fulfilled.

Fault handling: Fault Handling III, Other Emission-Related Component & Function
- Type III.

Diagnostic help
Fault diagnosis concerns an electrical fault in connecting leads or in the sensor.
Functions in the diagnostic tool related to the fault:
- Diagnostic status for the diagnosis.
- Temperature sensor value, unit °C.

For information, Tech 2 Menu Structure, DTC Menu, Read Value, Activate, Sys Info

Checking the wiring
Jiggle the wiring harness at several points and in different directions to detect intermittent breaks and short circuits. Observe the multimeter, diagnostic tool or test lamp during the check.

Proceed to Diagnostic Procedures Checking the Sensor's Grounding