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Circuit/System Testing

WARNING: This page is about a different car, the 2011 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Crank the engine while observing the scan tool Vehicle DTC Information.
    • If any of the following DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle to diagnose those DTCs P0201-P0208, P0230, P0335, P0336, P0340, P0403, P0404, P0601, P0602, P0603, P0604, P0606, P0607, P060D, P062F, P0641, P0651, P0685, P0689, P0690, P1516, P2610.
  2. Ignition OFF for 90 seconds, determine the current vehicle testing altitude. Ignition ON, observe the scan tool MAP Sensor parameter. Compare the parameter to the Altitude Versus Barometric Pressure table. The MAP sensor pressure parameter should be within the specified range indicated in the table.
    • If the reading is not correct for your altitude, diagnose the MAP sensor. Refer to DTC P0106 .
  3. Install a J 26792 HEI Spark Tester.
  4. Crank the engine while observing the spark tester. The spark tester should spark.
    5. IMPORTANT:

    Additional DTCs may set when using the fuel pump output control.

  5. Command the fuel pump ON and OFF. Fuel pump should energize when commanded ON and De-energize when commanded OFF
  6. Turn OFF the ignition.
  7. Install the CH-48027 . Turn ON the ignition and command the fuel pump ON while observing the CH-48027 . Refer to Fuel Pressure Gauge Installation and Removal . The fuel pressure should be between 384-425 kPa (55-61 psi).
  8. Inspect for the following conditions:
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