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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1472 (Engine Control System - Diagnosis - 4.2L (DTC P0140 To DTC P0506)) >> Diagnosis >> DTC P0341 >> Test Description

Test Description

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

  1. 4:  The counter should stop incrementing with the sensor electrical connector disconnected and set a DTC P0340. If the counter stills increments, this indicates that the PCM is malfunctioning.
DTC P0341

Step Action Value(s) Yes No
Schematic Reference:  Engine Controls Schematics 
Connector End View Reference: Powertrain Control Module (PCM) Connector End Views  or  Engine Controls Connector End Views 
1 Did you perform the Diagnostic System Check-Engine Controls? - Go to Step 2  Go to Diagnostic System Check - Engine Controls
2 Turn ON the ignition, with the engine OFF.
Are any other DTCs set?		 - Go to Diagnostic Trouble Code (DTC) List Go to Step 3 
3
  1. Start the engine.
  2. Observe the CMP Resync Counter on the scan tool.
Is the CMP Resync Counter incrementing?		 - Go to Step 4  Go to Diagnostic Aids
4 
  1. Turn OFF the ignition.
  2. Disconnect the CMP sensor.
  3. Start the engine.
  4. Observe the CMP Resync on the scan tool.
Did the CMP Resync Counter stop incrementing?		 - Go to Step 5  Go to Step 6 
5
  1. Turn OFF the engine.
  2. With the CMP connector still disconnected, connect a DMM set to the DC HZ scale from the CMP signal circuit (PCM side) to ground.
  3. Start the engine.
Does the DMM display a Hertz reading above the specified value?		 0 Hz Go to Step 6  Go to Step 7 
6 Visually and physically inspect all circuits going to the CMP sensor for the following:
  • Being routed too close to secondary ignition wires or components.
  • Being routed too close to after-market add-on electrical equipment.
  • Being routed too close to solenoids, relays, and motors.

If you find incorrect routing, correct the harness routing.
Did you find and correct the condition?		 - Go to Step 11  Go to Step 9 
7 Test for an intermittent and for a poor connection at the 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 11  Go to Step 8 
8 Replace the camshaft position (CMP) sensor. Refer to Camshaft Position (CMP) Sensor Replacement .
Did you complete the replacement?		 - Go to Step 11  -
9
  1. Disconnect the PCM.
  2. Check the CMP terminals for a faulty electrical connection.
  3. Repair the terminals as necessary. Refer to Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 11  Go to Step 10 
10 Replace the PCM. Refer to Powertrain Control Module (PCM) 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 12  Go to Step 2 
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 System OK
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