P2181

P2181-COOLING SYSTEM PERFORMANCE





For a complete wiring diagram Consult Diagrams/Electrical.

- When Monitored:
With the engine running and no Engine Coolant Temperature (ECT) sensor DTCs present.

- Set Condition:
The ECT sensor voltage should only change at a certain rate. If this rate is too slow or too fast, this fault will set. Two trip fault. Three good trips to clear MIL. ETC light will illuminate on first trip failure.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Initial Inspection and Diagnostic Overview.

Diagnostic Test

1. ACTIVE DTC

NOTE: Improper installation of a block heater could cause this DTC to set.

NOTE: Review Freeze Frame data. Extremely cold ambient temperatures may cause this DTC to set.

NOTE: Diagnose and repair any ECT sensor circuit or temperature sensor performance DTCs before continuing with this test.

NOTE: Inspect the cooling system for any conditions that can cause a change in engine warm up time, such as a broken water pump impeller or the addition of an aftermarket auxiliary cooler.

Turn the ignition on.
With the scan tool, select View DTCs.
Is the status Active for this DTC?

Yes

- Go to 2

No

- REFER TO the INTERMITTENT CONDITION diagnostic procedure. Checking For An Intermittent DTC.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

2. CHECKING THE ENGINE COOLANT TEMPERATURE SENSOR OPERATION
Perform the diagnostic procedure for *CHECKING THE ENGINE COOLANT TEMPERATURE SENSOR OPERATION. Checking the Engine Coolant Temperature Sensor Operation

Were any problems found?

Yes

- Repair as necessary.
- Perform the PCM Verification Test.Powertrain Verification Test

No

- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test