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Home >> Cadillac >> 2004 >> CTS Base, 3.6 7 >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 13 (Engine Controls - 2.6L & 3.2L - Diagnosis (DTC P0172 - P0446)) >> Diagnostic Trouble Codes >> DTC P0343 >> Test Description

Test Description

WARNING: This page is about a different variant/trim than selected.

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

  1. 2:  This step verifies that the fault is present.
  2. 5:  This step determines if the fault is in the ignition 1 voltage circuit or the low reference circuit.
  3. 6:  This step tests the CMP sensor signal circuit. Applying a ground causes the CMP signal Active Counter to increment when the circuit is touched if the circuit and the ECM are operating properly.
DTC P0343

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-Engine Controls? - Go to Step 2  Go to Diagnostic System Check - Engine Controls
2 
  1. Start the engine.
  2. Monitor the camshaft position (CMP) Active Counter parameter with the scan tool.
Does the CMP Active Counter 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.
Does the DTC fail this ignition?		 - Go to Step 4  Go to Diagnostic Aids
4
NOTE: Do not use a test lamp in order to test the continuity of the low reference circuit. Damage to the Engine Control Module (ECM) will result.
  1. Turn ON the ignition, with the engine OFF.
  2. Disconnect the CMP sensor.
  3. Measure the voltage from the ignition 1 voltage circuit of the CMP sensor connector to the low reference circuit of the CMP sensor connector with a DMM.
Is the voltage near the specified value?		 B+ Go to Step 6  Go to Step 5 
5  Measure the voltage from the ignition 1 voltage circuit of the CMP sensor connector to a good ground with a DMM.
Is the voltage near the specified value?		 B+ Go to Step 9  Go to Step 8 
6  Momentarily and repeatedly probe the CMP sensor signal circuit at the CMP sensor with a test lamp connected to a good ground.
Does the CMP Active Counter increment each time the test lamp contacts the circuit?		 - Go to Step 12  Go to Step 7 
7 Probe the signal circuit of the CMP sensor with a test lamp that is connected to a good ground. Refer to Probing Electrical Connectors in Wiring Systems.
Does the test lamp illuminate?		 - Go to Step 11  Go to Step 10 
8 Test the CMP sensor ignition 1 voltage circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 18  -
9 Test the CMP sensor low reference circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 18  Go to Step 13 
10 Test the CMP sensor signal circuit for a open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 18  Go to Step 13 
11
IMPORTANT: Disconnecting the ECM may remove the short from the circuit.
Test the CMP sensor signal circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.Did you find and correct the condition?		 - Go to Step 18  Go to Step 13 
12 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 18  Go to Step 14 
13 Test for an intermittent and for a poor connection at the ECM harness connector. Refer to Testing for Intermittent Conditions and Poor ConnectionsConnector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 18  Go to Step 17 
14
  1. Remove the CMP sensor. Refer to Camshaft Position (CMP) Sensor Replacement .
  2. Inspect the sensor for signs of physical damage.
Did you find and correct the condition?		 - Go to Step 18  Go to Step 15 
15
  1. Inspect the reluctor wheel for damage or looseness. Refer to Diagnostic Aids.
  2. If you find damage to the reluctor wheel, refer to Camshaft Replacement - Left in Engine Mechanical.
Did you find and correct the condition?		 - Go to Step 18  Go to Step 16 
16 Replace the CMP sensor. Refer to Camshaft Position (CMP) Sensor Replacement .
Did you complete the replacement?		 - Go to Step 18  -
17 Replace the ECM. Refer to Engine Control Module (ECM) Replacement .
Did you complete the replacement?		 - Go to Step 18  -
18
  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.
Does the DTC fail this ignition?		 - Go to Step 19  Go to Step 2 
19 Observe the Capture Info with a scan tool.
Are there any DTC's that have not been diagnosed?		 - Go to Diagnostic Trouble Code (DTC) List System OK
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