Specifications

Symptom List:

P0115-ENGINE COOLANT TEMP SENSOR CIRCUIT PLAUSIBILITY

P2012-ENGINE COOLANT TEMP SENSOR CIRCUIT PLAUSIBILITY

Test Note: All symptoms listed above are diagnosed using the same tests.

The title for the tests will be P0115-ENGINE COOLANT TEMP

SENSOR CIRCUIT PLAUSIBILITY.

POSSIBLE CAUSES

ECT SENSOR

ECT SENSOR - COLD

ECT SENSOR - HOT

HGH RESISTANCE IN ECT SENSOR CIRCUITS

ENGINE COLD TOO LONG

TEST ACTION APPLICABILITY

1 Note: The best way to diagnose this DTC is to allow the vehicle to remain

outside overnight in order to have a completely cold soaked engine.

Note: Extremely cold outside ambient temperatures may cause this DTC to

set.

Verify that the coolant level is correct.

Start the engine.

With the DRBIIIt, set the engine RPM to 1500 and allow the engine to warm up for

10-15 minutes.

With the DRBIIIt, monitor the Engine Coolant Temperature value during the warm

up cycle. Make sure the transition of temperature change is smooth.

Did the engine temperature reach a minimum of 80° C (176° F)?

All

Yes → Go To 2

No → Refer to the Service Information for cooling system performance

diagnosis. The most probable cause is a Thermostat problem.

Also, refer to any related TSBs.

Perform ROAD TEST VERIFICATION - VER-2.

2 NOTE: The engine temperature must be below 50°C (120°F) for this test.

NOTE: The thermostat must be operating correctly for this test to be valid.

With the DRBIIIt in Sensors, read and note the engine coolant temperature.

Using a temperature probe, measure the engine block temperature near the ECT

Sensor.

Are the readings within 7°C (13°F) of each other?

All

Yes → Go To 3

No → Go To 4

DRIVEABILITY - DIESEL