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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 104 (Engine Controls Self-Diagnostics - 6.5L) >> Diagnostic Tests >> DTC P0263, P0266, P0269, P0272, P0275, P0278, P0281 & P0284: Cylinder Balance System >> Diagnostic Procedure

Diagnostic Procedure

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  1. Did you perform the Diagnostic System Check-Engine Controls? If yes, go to next step. If no, see DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM.
  2. Connect the scan tool. Start the engine. Allow the engine to idle until the normal operating temperature is reached. Make sure all DTCs are cleared. Using the scan tool, cutout (Inj. Balance) the suspected cylinder. Is there an RPM drop in the suspected cylinder? If yes, go to next step. If no, go to step  4 .
  3. The DTC is intermittent. If no additional DTCs are stored, see DIAGNOSTIC AIDS  . If additional DTCs are stored, see DIAGNOSTIC TROUBLE CODE DEFINITIONS  .
  4. Check for the following basic engine mechanical or fuel delivery problems in the cylinder.
    • An injection nozzle malfunction.
    • An intake manifold restriction.

    If you find a problem is found, repair the condition as necessary. Did you perform a repair? If yes, go to step  6 . If no, go to next step.

    5. NOTE: The new injection pump must be timed. See appropriate ON-VEHICLE ADJUSTMENTS article.
  5. Replace the injection pump. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. After repairs, go to next step.
  6. Using the scan tool, clear the DTCs. Start engine and idle the engine at the normal operating temperature. Select DTC and the Specific DTC function. Enter the DTC number that was set. Operate the vehicle within the Conditions for Setting DTC until the scan tool indicates the diagnostic ran. Does the scan tool indicate the diagnostic passed? If yes, go to next step. If no, go to step  2 .
  7. Observe the stored information, Capture Info with a scan tool. Does the scan tool display any DTCs that you have not diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS  . If no, system is okay.
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