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Ask Ron Z. Your Own Question
Ron Z.
Ron Z., - Auto Tech -
Category: Car
Satisfied Customers: 18783
Experience:  18+yrs. experience diagnostics & repair of all makes/models.
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Isuzu Ascender: The check engine light on my Isuzu Ascender

Customer Question

The check engine light on my Isuzu Ascender 2004 stays on even after tune-up, oil change, and air filter change. Trying to fix to get smog check that passed emissions, but returned diagnostic code P118. Can you tell me what is causing this error code? The vehical has been driving fine with no non starts.
Submitted: 5 years ago.
Category: Car
Expert:  Ron Z. replied 5 years ago.
Welcome to! My name is DriveFast71(Ron) and I will do my best to answer all of your questions completely and accurately.

Is this the 6-cylinder or the 8-cylinder?

Customer: replied 5 years ago.
Expert:  Ron Z. replied 5 years ago.
The P0118 is a fairly straight forward code pointing to a fault in the Engine Coolant Temp Sensor. Inspect the wire harness and electrical connector for any loose or broken wires. If the visual inspection checks ok, most commonly, simply replacing the sensor will solve the problem.
Ron Z. and 4 other Car Specialists are ready to help you
Customer: replied 5 years ago.
My car repair guy replaced this sensor and we are still getting the code. I really need this fixed to pass smog check. Is there something else that could be wrong?
Expert:  Ron Z. replied 5 years ago.
Actually it's pretty straight forward. Either a faulty ECT, faulty wiring to the ECT or a faulty PCM. Below i've included the diagnostic flow chart, that will help you determine if the sensor is fault or find the location of the problem within the wiring, or how to determine if the PCM is the culprit.

Customer: replied 5 years ago.
Thank you. I'll pass this on to the repairman.
Expert:  Ron Z. replied 5 years ago.
Glad I could help! Have a great day!