P0118
Read the instructions below then
start the fault diagnostic procedure.
Symptom: CHECK ENGINE.
Engine Coolant Temperature Sensor Circuit. Short to B+ / Open circuit.
Fault symptom
On-Board Diagnostics
Type of diagnosis:
Enable criteria:
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Battery voltage should be between 10.2-15.8 V.
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P0112 or P0113 should not be detected.
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Intake air temperature should be over -10 °C.
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Fault criteria:
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Voltage on the input exceeds 4.974 V for more than 0.52s.
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Dependents:
System reaction to a fault:
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The control module will continue using the coolant temperature substitute value, -20 °C on start and +60 °C when the engine is running. The following limitations apply: Pedal position sensor adjustable to max 60%
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OK report:
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Voltage on the input falls below 4.974 V for more than 0.52s.
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Fault handling:
(See section
Fault handling III, other emissions-related components and functions
for more information)
Diagnostic help
Fault diagnosis concerns an electrical fault in connecting leads or in the sensor.
Functions in the diagnostic tool related to the fault:
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Read value:
Coolant Temperature (
Coolant Temperature Sensor)
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See also description of read value under
"Read Values" menu
for more information.
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.
