Test Description

The numbers below refer to the step numbers on the diagnostic table.

1. 2. This step verifies that the fault is present. A hard start is observed when a malfunction is present.
2. 4. This step tests the CMP sensor 12-volt reference circuit from the PCM to the CMP.
3. 5. This step tests the CMP sensor low reference circuit from the PCM to the CMP.
4. 6. This step tests the CMP sensor signal circuit. Applying a voltage causes the CAM signal input high to low and low to high parameter to increase if the circuit and the PCM are operating properly.
5. 7. This step tests the resistance of the CMP sensor 12-volt reference circuit from the PCM to the CMP sensor.
6. 9. This step tests the resistance of the CMP sensor low reference circuit from the PCM to the CMP sensor.

Fig 1: DTC P0343 (1 Of 3)

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Fig 2: DTC P0343 (2 Of 3)

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Fig 3: DTC P0343 (3 Of 3)

Courtesy of GENERAL MOTORS CORP.