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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1037 (Engine Controls Diagnosis - 6.6L (LLY) (DTC P0016 To DTC P0237)) >> Diagnosis >> DTC P0234 >> Diagnostic Aids

Diagnostic Aids

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.
DTC P0234

Step Action Values Yes No
Schematic Reference:  Altitude vs Barometric Pressure 
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. Turn ON the ignition, with the engine OFF.
  2. Monitor the DTC Information with a scan tool.
Is DTC P0045, P0046, P0653, P2229, P2563, P2564 or P2565 also set?		 - Go to Diagnostic Trouble Code (DTC) List Go to Step 2 
3
  1. Allow the engine to reach operating temperature.
  2. Turn OFF the ignition for 30 seconds.
  3. Turn ON the ignition, with the engine OFF.
Does the scan tool indicate that the difference between the boost sensor pressure and the barometric pressure (BARO) sensor pressure is more than the specified value?		 10 kPa Go to Step 4  Go to Step 6 
4
  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 5  Go to Step 7 
5 Test the boost sensor low reference circuit for an open and for high resistance. Refer to Testing for Continuity and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 12  Go to Step 8 
6 Remove and inspect the turbocharger for wear or damage. Refer to Turbocharger Replacement and Turbocharger Cleaning and Inspection in Engine Mechanical.
Did you find a condition with the turbocharger?		 - Go to Step 9  Go to Diagnostic Aids
7 Test for an intermittent and for a poor connection 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 12  Go to Step 10 
8 Test for an intermittent and for poor connection at the engine control module (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 12  Go to Step 11 
9 Replace the turbocharger. Refer to Turbocharger Replacement in Engine Mechanical.
Did you complete the replacement?		 - Go to Step 12  -
10 Replace the boost sensor. Refer to Boost Pressure Sensor Replacement .
Did you complete the replacement?		 - Go to Step 12  -
11 Replace the ECM. Refer to Engine Control Module (ECM) Replacement .
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. Perform the turbocharger learn procedure. Refer to Turbocharger Learn Procedure .
  5. 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 System OK
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