GM Service Manual Online
For 1990-2009 cars only

Object Number: 33715  Size: MF
Engine Controls Components
Engine Controls Schematics
OBD II Symbol Description Notice
Handling ESD Sensitive Parts Notice

Circuit Description

This DTC identifies that the cam and the crank relationship is skewed and that the cam pulses are read in a haphazard ratio to the crank pulses. This fault is not a solid or consistent failure. The fault may not act the same way twice. This DTC is a type B DTC.

Conditions for Setting the DTC

The following conditions will set the DTC:

    • The engine running
    • The cam sensor reference pulse is not detected at the correct interval

Action Taken When the DTC Sets

The VCM will turn ON the MIL (Malfunction Indicator Lamp) after 2 consecutive test failures.

Conditions for Clearing the MIL/DTC

The VCM turns OFF the MIL after 3 consecutive driving trips without a fault condition present. A history DTC will clear if no fault conditions have been detected for 40 warm-up cycles (the coolant temperature has risen 22°C (40°F) from the start-up coolant temperature and the engine coolant temperature exceeds 71°C (160°F) during that same ignition cycle) or the scan tool clearing feature has been used.

Diagnostic Aids

A poor connection, rubbed through wire insulation, or a wire that is broken inside the insulation may cause an intermittent.

Any circuitry, that is suspected as causing the intermittent complaint, should be thoroughly checked for the following conditions:

    • Backed out terminals
    • Improper mating
    • Broken locks
    • Improperly formed or damaged terminals
    • Poor terminal to wiring connections or
    • Physical damage to the wiring harness.

Refer to Intermittent Conditions .

Test Description

The step number below refers to the step number in the diagnostic table.

  1. This step determines if DTC P0341 is the result of a hard failure or an intermittent condition. Determines, also, if voltage is available to the CMP through the VCM.

    If the ignition 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 VCM connections or VCM is faulty.

Step

Action

Value(s)

Yes

No

1

Important: Before clearing DTCs, use the scan tool in order to record the freeze frame and the failure records for reference because the Clear Info function will lose the data.

Was the Powertrain On-Board Diagnostic (OBD) System Check performed?

--

Go to Step 2

Go to Powertrain On Board Diagnostic (OBD) System Check

2

Check for an intermittent short to the voltage or EMI (electromagnetic interference) such as the wires which run along side the spark plug wires or the high power transmitters (like the mobile radios operating in the vicinity) on the Camshaft Position sensor wires.

Was a problem found?

--

Go to Step 3

Go to Step 4

3

Repair short to voltage or EMI as necessary. Refer to Wiring Repairs in Engine Electrical.

Is the repair complete?

--

Go to Step 4

--

4

  1. Using the scan tool, select the DTC and the Clear Info.
  2. Start the Engine.
  3. Idle at the normal operating temperature.
  4. Select the DTC and the Specific.
  5. Enter the DTC number which was set.
  6. Operate the vehicle within the conditions for setting this DTC as specified in the supporting text.

Does the scan tool indicate that this diagnostic ran and passed?

--

Go to Step 5

Go to step 2

5

Using the scan tool, select the Capture Info and the Review Info.

Are any DTCs displayed that have not been diagnosed?

--

Go to The Applicable DTC Table

System OK