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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 65 (Engine Control System - 3.6L (Ly7) (DTC P0135 To DTC P0420)) >> Diagnosis >> DTC P0341, P0346, P0366, or P0391 >> Test Description

Test Description

WARNING: This page is about a different car, the 2005 Buick LaCrosse and 2005 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. 2:  This step verifies that the condition is present.
  2. 5:  This step inspects for electromagnetic interference (EMI) on the CMP sensor circuits.
DTC P0341, P0346, P0366, or P0391

Step Action Yes No
Schematic Reference:  Engine Controls Schematics 
Connector End View Reference:  Engine Control Module (ECM) Connector End Views  or  Engine Controls Connector End Views 
1 Did you perform the Diagnostic System Check - Vehicle? Go to Step 2  Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2 
  1. Turn ON the ignition, with the engine OFF.
  2. Clear the DTCs with a scan tool.
  3. Start the engine.
  4. Observe the DTC information with a scan tool.
Does DTC P0341, P0346, P0366, or P0391 fail this ignition?		 Go to Step 3  Go to Step 4 
3 Did DTC P0342, P0343, P0347, P0348, P0367, P0368, P0392, or P0393 also fail this ignition cycle? Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information Go to Step 5 
4
  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 5  Go to Diagnostic Aids
5  Inspect the circuit of the camshaft position (CMP) sensor for the following conditions:
  • Routed too close to the ignition coils
  • Routed too close to after-market add-on electrical equipment
  • Routed too close to solenoids, relays, and motors

If you find an incorrect routing, correct the harness routing.
Did you find and correct the condition?		 Go to Step 10  Go to Step 6 
6 Test for an intermittent and for a poor connection at the appropriate CMP sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 10  Go to Step 7 
7 Test for an intermittent and for a poor connection at the engine control module (ECM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 10  Go to Step 8 
8
  1. Remove the appropriate CMP sensor.
  2. Inspect the CMP sensor and the camshaft actuator reluctor wheel for the following conditions:
    • Incorrect sensor installation
    • A cracked or damaged sensor
    • The sensor coming in contact with the reluctor wheel
    • Excessive air gap between the reluctor wheel and the sensor
    • Foreign material passing between the sensor and the camshaft reluctor wheel
    • Camshaft reluctor wheel damage
Did you find and correct the condition?		 Go to Step 10  Go to Step 9 
9 Replace the CMP sensor. Refer to the appropriate procedure:
Did you complete the replacement?		 Go to Step 10  -
10
  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 11 
11 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 in Vehicle DTC Information System OK
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