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Test Description

WARNING: This page is about a different car, the 2006 Chevrolet Monte Carlo and 2006 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. 4:  The test lamp in this step is used to apply a load to the 12-volt reference circuit of the CMP sensor.
DTC P0340

Step Action Values 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
2
  1. Start and idle the engine.
  2. Monitor the camshaft position (CMP) sensor active counter parameter with a scan tool.
Does the CMP sensor active counter number increment?		 - Go to Testing for Intermittent Conditions and Poor Connections Go to Step 3 
3
  1. Turn OFF the ignition.
  2. Disconnect the CMP sensor electrical connector.
  3. Test for shorted terminals and poor connections at the CMP sensor wire harness electrical connector and the mating electrical connector on 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 12  Go to Step 4 
4 
  1. Turn ON the ignition, with the engine OFF.
  2. Connect a jumper wire to the 12-volt reference circuit at the CMP sensor wire harness electrical connector.
  3. Connect a test lamp between the jumper wire and a good ground.
  4. Connect the positive lead of the DMM to the junction of the jumper wire and test lamp.
  5. Connect the negative lead of the DMM to a good engine ground.
  6. Measure the voltage from the 12-volt reference circuit to a good ground with a DMM. Refer to Circuit Testing .
Is the voltage within the specified range?		 10-13 V Go to Step 5  Go to Step 6 
5
  1. Remove the test lamp from the jumper wire.
  2. Connect another jumper wire to the signal circuit of the CMP sensor wire harness electrical connector.
  3. Turn ON the ignition, with the engine OFF.
  4. Monitor the CMP active counter parameter with a scan tool.
  5. Momentarily connect the two ends of the jumper wires together several times.
Does the CMP sensor active counter number increment?		 - Go to Step 10  Go to Step 7 
6 Test the CMP 12-volt reference circuit between the CMP sensor and the engine control module (ECM) for the following conditions:
  • An open
  • High resistance
  • A short to ground

Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 12  Go to Step 9 
7 Test the CMP low reference circuit between the CMP sensor and the ECM for the following conditions:
  • An open
  • High resistance
  • A short to ground
  • A short to voltage

Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 12  Go to Step 8 
8 Test the CMP signal circuit between the CMP sensor and the ECM for the following conditions:
  • An open
  • High resistance
  • A short to ground
  • A short to voltage

Did you find and correct the condition?		 - Go to Step 12  Go to Step 9 
9 Test for shorted terminals and poor connections at the ECM wire harness electrical connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 12  Go to Step 11 
10 Replace the CMP sensor. Refer to Camshaft Position (CMP) Sensor Replacement .
Did you complete the replacement?		 - Go to Step 12  -
11 Replace the ECM. Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?		 - Go to Step 12  -
12
  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 13 
13 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
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