Circuit Description
The camshaft position sensor (CMP) is used to indicate camshaft position so that the powertrain control module (PCM) can determine which cylinder is misfiring when misfire is present. If the PCM receives an intermittent signal from the CMP, then the CMP Resync Counter will increment. In order to seat a DTC, the PCM must see a minimum number of resync's within a maximum time.
Conditions for Setting the DTC
| • | Engine is running. |
| • | Cam Sensor Activity is not incrementing. |
Action Taken when the DTC Sets
The malfunction indicator lamp (MIL) will illuminate.
Conditions for Clearing the DTC
| • | The MIL will turn OFF after passing three consecutive diagnostic tests. |
| • | A history DTC will clear after 40 consecutive ignition cycles have occurred without a fault. |
| • | History and current DTCs can be cleared by using a scan tool. |
Diagnostic Aids
An Intermittent problem may be caused by a poor connection, rubbed through wire insulation, or a wire that is broken inside the insulation.
Any circuitry, that is suspected as causing the intermittent complaint, should be thoroughly checked for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, poor terminal to wiring connections or physical damage to the wiring harness.
If the PCM sees less than 15 resync's in 256 seconds, the counter is reset to 0. Anytime a poor connection is present, the Cam Sensor Reference Activity Counter will stop incrementing and the Cam Sensor Resync Counter will increment.
Test Description
The numbers below refer to the step numbers on the diagnostic chart.
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This step determines if DTC P0342 is the result of a hard failure or an intermittent condition.
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Determine if voltage is available to the CPS through the PCM.
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If the feed circuit is shorted to ground, the test light will be ON. This step determines if the circuit is open or shorted to ground. If the circuit is OK, then the PCM connections or PCM is faulty.
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Voltage will vary between 5 and 7 volts from the CMP sensor. A steady voltage reading near 5 volts or 0 to 1 volt indicates the signal is not being sent to the PCM. Refer to PCM Terminal End View in front of this section for breakout box pin locations.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Engine Controls Schematics | ||||
1 | Was the On-Board Diagnostic (OBD) System Check performed? | -- | Go to Step 2 | |
Is the Cam Sensor Reference Activity counter incrementing? | -- | Go to Step 3 | Go to Step 4 | |
3 |
Is the Cam Sensor Reference Activity counter incrementing? | -- | Go to Diagnostic Aids | Go to Step 4 |
Did the test light illuminate? | -- | Go to Step 5 | Go to Step 6 | |
5 | With a test light connected to B+, probe the CMP ground terminal. Did the test light illuminate? | -- | Go to Step 7 | Go to Step 8 |
Did the test light illuminate? | -- | Go to Step 9 | Go to Step 10 | |
Is the voltage varying within the specified value? | 5-7 V | Go to Step 12 | Go to Step 13 | |
8 | Repair open in CMP ground circuit. Is action complete? | -- | -- | |
9 | Repair short to ground in CMP feed circuit. Is action complete? | -- | -- | |
10 | Check for an open in the CMP feed circuit and repair as necessary. Was a repair necessary? | -- | Go to Step 11 | |
11 | Check for a poor connection in the CMP feed circuit and repair as necessary. Was a repair necessary? | -- | Go to Step 12 | |
12 | Replace PCM. Is action complete? | -- | -- | |
13 | Check CMP signal circuit for an open or short to ground or voltage and repair as necessary. Was a repair necessary? | -- | Go to Step 14 | |
14 | Check for a poor connection in the CMP signal circuit and repair as necessary. Was a repair necessary? | -- | Go to Step 15 | |
15 | Replace camshaft position (CMP) sensor. Is action complete? | -- | -- | |
