XJR (X308) V8-4.0L SC (AJ26) (1998)
Coolant Temperature Sensor/Switch (For Computer): Pinpoint Tests
Pinpoint Test A: P0116, P0125
P0116, P0125
TEST A: RETRIEVE DTCS
NOTE: Battery and or ECM disconnection prior to scanning will erase all data, ensure that the correct DTC is present.
Connect scan tool.
Record DTC(s), freeze frame data and
GO to [A2]
A2: ENGINE COOLANT SYSTEM CHECK
NOTE: Do not use the instrument display, if the ECT has failed this will not operate correctly.
Check engine temperature rise using a thermocouple or similar device.
^ Engine temperature increasing?
Yes
GO to [A3]
No
Check coolant level
Check coolant for contamination
Check/test thermostat