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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 991 (Engine Controls Diagnosis - 6.6L (Lb7) (DTCS P0016 To P0236)) >> Diagnosis >> DTC P0016 >> Test Description

Test Description

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. 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. 3:  A condition that sets one of these DTCs may also result in a DTC P0016. Diagnose these codes before continuing with this diagnostic.
  2. 4:  A loose CMP sensor may result in a DTC P0016. Attempt to tighten the sensor to proper torque specifications. If unable to prevent CMP sensor movement, inspect the cover for damage before replacing the sensor.
  3. 5:  A cracked CMP sensor or internal breakage may result in DTC P0016. This will not be apparent unless the sensor is removed from the front engine cover.
  4. 6:  If the CMP sensor appears to be damaged by contact with the camshaft gear, you may need to remove the front engine cover and inspect for excessive camshaft end-play.
DTC P0016

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-Engine Controls? Go to Step 2  Go to Diagnostic System Check - Engine Controls
2
  1. Observe the Freeze Frame/Failure Records data 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 3  Go to Intermittent Conditions
3  Do any of the following DTCs set?
  • DTC P0335
  • DTC P0336
  • DTC P0340
  • DTC P0341

If one or more of these DTCs sets, go to the appropriate table and diagnose that DTC first.		 Go to Diagnostic Trouble Code (DTC) List Go to Step 4 
4  Inspect for a loose CMP sensor. If the sensor cannot be tightened, the sensor must be replaced.
Does the CMP sensor move without being able to be tightened?		 Go to Step 7  Go to Step 5 
5 
  1. Remove the CMP sensor. Refer to Camshaft Position (CMP) Sensor Replacement .
  2. Inspect for a broken CMP sensor casing or a rattle inside when shaken.
Does the CMP sensor show any signs of physical damage?		 Go to Step 7  Go to Step 6 
6 
  1. Remove the front engine cover. Refer to Engine Front Cover Replacement in Engine Mechanical - 6.6L.
  2. Check for excessive camshaft end-play. Refer to Camshaft Replacement in Engine Mechanical - 6.6L.
  3. Inspect for front engine cover damage.
  4. Inspect for timing gear misalignment or damage. Refer to Camshaft Replacement in Engine Mechanical - 6.6L.
Did you find and correct the condition?		 Go to Step 8  Go to Symptoms - Engine Mechanical in Engine Mechanical - 6.6L
7 Replace the CMP sensor. Refer to Camshaft Position (CMP) Sensor Replacement .
Did you complete the replacement?		 Go to Step 8  -
8
  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 9 
9 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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