Test Description

The numbers below refer to the step numbers in the diagnostic procedures.

1. 1  - The Diagnostic System Check - Engine Controls prompts the technician to complete some basic checks and store freeze frame data, if applicable. This creates an electronic copy of data taken when fault occurred. Information is then stored in the scan tool for later reference.
2. 2  - This step tests for an open in CMP sensor ground circuit between PCM connector C1 terminal No. 34 to splice SP108. Engine will not stay running and DTC P0340 will set if CMP sensor and CKP sensor ground circuit is open.
3. 3  - This step determines if DTC P0340 is the result of a hard failure or an intermittent condition.
4. 5  - This step verifies internal resistance of CMP sensor. A typical value at 74°F (23°C) is 1.1 k/ohms.
5. 6  - This step verifies CMP sensor output signal. CMP sensor sends PCM one electrical pulse for every revolution of the intake camshaft. Therefore, the AC signal generated by the CMP sensor will be numerically analogous to engine speed. With engine speed at about 1200 RPM, CMP sensor voltage should be around 2.450-2.5500 volts AC.
6. 8  - This step tests the Camshaft Position (CMP) input circuit to PCM. AC signal generated by CMP sensor will be numerically analogous to engine speed. With engine speed at about 1200 RPM, CMP sensor voltage should be around 2.450-2.550 volts AC. CMP sensor signal wire must be removed from PCM connector to accurately check sensor output. If CMP sensor signal wire is backprobed while connected to PCM, AC voltage indicated on a DMM will be approximately 15-20 percent lower than actual engine speed.
7. 12  - This step inspects for a faulty signal rotor on the camshaft. Visually check the tooth of the signal rotor through the CMP sensor aperture for damage, foreign material, and installation.