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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 965 (Engine Controls Diagnosis - 6.6L (Lb7) (DTCS P0016 To P0236)) >> Diagnosis >> DTC P0234 (Federal RPO FE9, NG1) >> 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. 5:  This step tests the wastegate actuator diaphragm for a leak.
  2. 6:  This step tests the wastegate actuator, the linkage, and the wastegate for proper operation.
DTC P0234 (Federal RPO FE9, NG1)

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. Install a scan tool.
  2. Start the engine.
  3. Monitor the Diagnostic Trouble Code (DTC) Information with the scan tool.
Does the scan tool indicate that DTC P2229 is current?		 - Go to DTC P2229 (Federal RPO FE9, NG1) or DTC P2229 (California RPO YF5, NE1, and VCL) Go to Step 3 
3
  1. Allow the engine to reach operating temperature.
  2. Turn OFF the ignition.
  3. Turn ON the ignition, with the engine OFF.
Does the scan tool indicate that the difference between the boost sensor pressure and the BARO sensor pressure is more than the specified value?		 10 kPa Go to Step 7  Go to Step 4 
4
  1. Turn OFF the ignition.
  2. Inspect for a ruptured or disconnected pressure hose from the charged air tube to the wastegate actuator.
Did you find and correct the condition?		 - Go to Step 14  Go to Step 5 
5 
  1. Remove the hose from the wastegate actuator tube.
  2. Connect a hand vacuum pump to the actuator tube.
  3. Apply 51 kPa (15 inches Hg) of vacuum.
Does the vacuum hold for 10 seconds?		 - Go to Step 6  Go to Step 11 
6 
CAUTION: Refer to Safety Glasses and Compressed Air Caution in Cautions and Notices.
Apply compressed air, not exceeding 310 kPa (45 psi), to the actuator tube. The wastegate should begin to open near 207 kPa (30 psi) and fully open at 310 kPa (45 psi). the actuator rod stroke should measure near 4 millimeters (0.2 inch).Does the wastegate move to the open position?		 - Go to Diagnostic Aids Go to Step 11 
7
  1. Turn OFF the ignition.
  2. Disconnect the boost sensor harness connector.
  3. Connect a jumper wire between each of the terminals in the boost sensor harness connector and the corresponding terminal at the boost sensor. Refer to Using Connector Test Adapters in Wiring Systems.
  4. Turn ON the ignition, with the engine OFF.
  5. Measure the voltage from the low reference circuit of the boost sensor at the jumper wire terminal to a good ground with a DMM. Refer to Measuring Voltage Drop in Wiring Systems.
Is the voltage more than the specified value?		 0.2 V Go to Step 8  Go to Step 9 
8 Test the low reference circuit of the boost sensor for high resistance or for an open. Refer to Testing for Continuity and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 14  Go to Step 10 
9 Inspect for poor connections at the boost 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 14  Go to Step 12 
10 Inspect for poor connections at the 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 14  Go to Step 13 
11 Replace the turbocharger. Refer to Turbocharger Replacement in Engine Mechanical.
Did you complete the replacement?		 - Go to Step 14  -
12 Replace the boost sensor. Refer to Boost Sensor Replacement (Federal Emissions) or Boost Sensor Replacement (California Emissions) .
Did you complete the replacement?		 - Go to Step 14  -
13 Replace the ECM. Refer to Engine Control Module (ECM) Replacement .
Did you complete the replacement?		 - Go to Step 14  -
14
  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 15 
15 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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