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On-Board Diagnostic (OBD II) System Check: Troubleshooting

TROUBLESHOOTING CHART

Step Action Value(s) Yes No
1
  1. Turn the ignition switch to ON.
  2. Observe the Malfunction Indicator Lamp (MIL).

Is the MIL illuminate?		 - Go to Step 2 Go to No Malfunction Indicator Lamp 
2
  1. Turn the ignition switch to LOCK.
  2. Install the scan tool to the Data Link Connector (DLC).
  3. Turn the ignition switch to ON.
  4. Attempt to display the Engine Control Module (ECM) engine data with the scan tool.

Does the scan tool display the ECM engine data?		 - Go to Step 3 Go to Step 8
3
  1. Using the scan tool output test function, select the MIL lamp control and command the MIL OFF.
  2. Observe the MIL.

Does the MIL turn OFF?		 - Go to Step 4 Go to Malfunction Indicator Lamp ON Steady 
4 Attempt to start the engine.
Does the engine start and continue to run?		 - Go to Step 5 Go to Engine Cranks But Will Not Run 
5 Select DISPLAY DTC with the scan tool.
Are any Diagnostic Trouble Codes (DTCs) stored?		 - Go to Step 6 Go to Step 7
6 Check the display for DTCs P0107, P0108, P0113, P0118, P0122, P0123, P0712, P1392.
Are two or more of the following DTCs stored?		 - Go to Multiple ECM Information Sensor DTCs Set  Go to applicable DTC table
7 Compare the ECM data values displayed on the scan tool to the typical engine scan data values.
Are the displayed values normal or close to the typical values?		 - Go to Step 8 Go to indicated component system check
8
  1. Turn the ignition switch to LOCK.
  2. Disconnect the ECM connector.
  3. Turn the ignition switch to ON.
  4. Check the serial data circuit for an open, short to ground, or short to voltage. Also check the DLC ignition feed circuit for an open or short to ground, and check the DLC ground circuits for an open.

Is a problem found?		 - Go to Step 9 Go to Step 10
9 Repair the open, short to ground, or short to voltage in the serial data circuit or the DLC ignition feed circuit.
Is the repair complete?		 - System OK -
10
  1. Attempt to reprogram the ECM.
  2. Attempt to display the ECM data with the scan tool.

Does the scan tool display ECM engine data?		 - Go to Step 2 Go to Step 11
11 Replace the ECM.
Is the replacement complete?		 - System OK -
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