Questions and Answers

Nissan Pathfinder LE DTC P1140 Q. Hi there I have the following: 2001 Nissan Pathfinder LE 3.5 liter fuel injected V-6 Automatic transmission 41,000 miles ABS P/S, A/C, cruise control

My Check Engine Light recently came on. When I hooked it up to a buddy's code retriever, it gave me a code of P1140. Now I can't find anyplace that lists what that code is for. Can you tell me what that code is for???

Thank you,
Mark

A. DTC P1140 indicates a malfunction in the Intake Valve Advance Unit (IVAU). IVAU position sensors are located in the front cylinder heads in both right/left banks. This sensor uses a Hall IC element.

The cam position is determined by the intake primary cam sprocket concave, in three places. The PCM provides feedback to the intake valve timing control for appropriate target valve open-close timing according to drive conditions based on detected cam position.

A malfunction is detected when an excessively high or low voltage from the sensor is sent to the PCM.

Some possible cause for this code are:

• Harness or connectors (Intake valve timing control position sensor circuit is open or shorted)
• Intake valve timing control position sensor.
• Crankshaft position sensor (REF)
• Crankshaft position sensor (POS)
• Camshaft position sensor (PHASE)

This is not something you want to mess with without the proper tools and instructions. A mistake can cause serious engine damage, as one of my co-workers found out one day. I would let a Nissan Dealer take care of it. I would check all the electrical connectors to be sure they are clean and tight, but that's about as far as I would go with it.