P0116
Symptom: CHECK ENGINE lamp (MIL) on.
Coolant temperature, slow increase
Fault symptoms
CHECK ENGINE lamp (MIL) on.
Conditions
P0116
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The indicated engine coolant
temperature is lower than
the that calculated by the control module.
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Diagnostic help
The diagnostic trouble code can be generated in connection with:
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the connection of a non-approved
external parking heater.
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the formation of ice in the cooling system.
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a fault in the coolant temperature sensor or its electrical circuit.
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a fault in the thermostat.
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Check the wiring
Intermittent faults may occur as a result of temporary short circuits and breaks in the
wiring. Jiggle the wiring at several points and in different directions to ascertain whether the
wiring harness, including any connectors, is causing the trouble. Observe the multimeter,
ISAT scan tool or test lamp while doing this.
Diagnostic procedure
1. Check the anti-freeze
Check the freezing point of the coolant when the outside temperature is below
0°C (32°F).
Is the freezing point OK?
Continue with point 2.
Rectify the fault. Continue with point 4.
2. Check the thermostat
The engine should be cold enough to allow a hand to be placed on the cylinder
head without discomfort.
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Connect an ISAT scan tool and
contact the ICE.
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Select "READ FUNCTIONS".
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Select "COOLANT TEMPERATURE".
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Start the engine and warm it up at idling speed.
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Place a hand on the upper radiator hose near the thermostat housing to feel
whether it quickly becomes hot when the temperature of the coolant reaches about 92°C
(198°F) and the thermostat opens.
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The coolant temperature should then remain fairly constant at this temperature,
about 89°C (192°F), for a minute or so.
Result OK?
Continue with point 3.
Change the thermostat. Continue with point
4.
3. Check the coolant temperature sensor
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Connect the ISAT Scan
Tool.
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Start the engine and run it at idling speed.
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Select "READ FUNCTIONS".
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Select "COOLANT TEMPERATURE".
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Make a note of the temperature.
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Make a note of the temperature.
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The two temperature readings should not differ by more than a maximum of
5°C (9°F).
Are the temperature readings OK?
Continue with point 4.
See the fault diagnosis procedure for diagnostic trouble codes P0117 and
P0118.
4. Final check
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Clear the diagnostic trouble
code.
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Implementation of driving cycle:
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Evaluation of driving cycle:
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Result unsatisfactory?
Continue as described in
.
The steps taken to rectify the fault were correct.
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Clear the diagnostic trouble
code for the temperature sensor in the ICE.
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