Circuit Description

WARNING: This page is about a different car, the 2007 Isuzu i-370, 2007 GMC Canyon, and 2007 Chevrolet Colorado. However, it is still accessible from the selected car via links, so may be relevant.

The exhaust camshaft position (CMP) sensor produces a 5X plus a sync signal for each revolution of the exhaust camshaft. These signals are for control of sequential fuel injection and for exhaust camshaft phaser control. The CMP is connected directly to the powertrain control module (PCM) and consists of the following circuits:

12-volt reference
Low reference
CMP sensor signal

If the PCM receives an incorrect number of CMP sensor pulses in a given number of crankshaft position (CKP) sensor pulses, DTC P0366 will set.

The PCM runs 2 tests to diagnose the CMP sensor performance system. It uses a Near Engine Start, CMP fast event based test, and an After Engine Start, CMP slow event based test. The Near Engine Start, CMP fast event based, test runs first upon or during start-up. If the test fails, it will set DTC P0366. If the test passes it will initiate the After Engine Start, CMP slow event based, test and runs this test continuously unless it detects an error and sets DTC P0366.