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For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2005 🢒 Cobalt 🢒 Restraints 🢒 SIR 🢒 DTC P0341

Circuit Description

The camshaft position (CMP) sensor is triggered by a notched reluctor wheel built onto the exhaust camshaft sprocket. The CMP sensor provides four signal pulses every camshaft revolution. Each notch, or feature of the reluctor wheel is of a different size which is used to identify the compression stroke of each cylinder and to enable sequential fuel injection. The CMP sensor is connected to the powertrain control module (PCM) by the following circuits:

    • A 12-volt circuit
    • A low reference circuit
    • A signal circuit

The PCM monitors the CMP sensor performance by comparing the number of it's pulses to the crankshaft position (CKP) sensor pulses. There is a given number of CMP sensor pulses to CKP sensor pulses. If this ratio is not kept, the PCM will set DTC P0341.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC P0341 Camshaft Position (CMP) Sensor Performance

Conditions for Running the DTC
    • DTCs P0106, P0107, P0108, and P0340 are not set.
    • The engine is running.
    • The manifold absolute pressure (MAP) is more than 45 kPa.
    • This DTC runs continuously.

Conditions for Setting the DTC

The ECM detects more than 120 extra CMP signal pulses or less than 80 CMP pulses than expected when compared to the CKP sensor signal pulses.

Action Taken When the DTC Sets
    • The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
    • The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

Conditions for Clearing the MIL/DTC
    • The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
    • A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
    • A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
    • Clear the MIL and the DTC with a scan tool.

Step

Action

Yes

No

Schematic Reference: Engine Controls Schematics

Connector End View Reference: Engine Controls Connector End Views or Powertrain Control Module Connector End Views

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

2
  1. Start the engine.
  2. Observe the CMP Sensor parameter on the scan tool.

Does the CMP Sensor parameter increment?

Go to Step 3

Go to Step 4

3
  1. Observe the Freeze Frame/Failure Records for this DTC.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.

Did the DTC fail this ignition?

Go to Step 4

Go to Intermittent Conditions

4

Test the signal circuit of the camshaft position (CMP) sensor for an intermittent condition. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs .

Did you find and correct the condition?

Go to Step 11

Go to Step 5

5

Test the low reference circuit of the CMP sensor for an intermittent condition. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs .

Did you find and correct the condition?

Go to Step 11

Go to Step 6

6

Test for an intermittent and poor connection at the powertrain control module (PCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 11

Go to Step  7

7

Test for an intermittent and poor connection at the CMP sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 11

Go to Step 8

8
  1. Remove the CMP sensor. Refer to Crankshaft Position Sensor Replacement .
  2. Visually inspect the CMP sensor for the following conditions:
    3. • Physical damage
    • Loose or improper installation
    • Excessive air gap between the CMP sensor and the reluctor wheel
    • Electromagnetic interference in the CMP sensor circuits
    • Foreign material passing between the CMP sensor and the reluctor wheel
    • Insufficient fuel

Did you find and correct the condition?

Go to Step 11

Go to Step 9

9

Visually inspect the CMP reluctor wheel for the following conditions:

    • Physical damage
    • Improper installation
    • Excessive play or looseness

Did you find and correct the condition?

Go to Step 11

Go to Step 10

10

Replace the CMP sensor. Refer to Crankshaft Position Sensor Replacement .

Did you complete the replacement?

Go to Step 11

--

11
  1. Clear the DTCs with a scan tool.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.

Did the DTC fail this ignition?

Go to Step 2

Go to Step 12

12

Observe the Capture Info with a scan tool.

Are there any DTCs that have not been diagnosed?

Go to Diagnostic Trouble Code (DTC) List - Vehicle

System OK