How to Troubleshoot Fuel and Emissions Systems
When the HDS is connected to the data link connector (DLC) (A) (located under the driver's side of the dashboard), it will indicate the diagnostic trouble code (DTC) when the ignition switch is turned ON (II).
If the MIL or the PGM-FI display has been reported on, or if a drivability problem is suspected, follow this procedure:
  1. Connect the HDS to the DLC (see the HDS user's manual for specific instructions).
  1. Turn the ignition switch ON (II), select DIESEL system and observe the DTCs in the DTC MENU on the screen.
  1. Record all DTCs, and freeze data.
  1. Do the troubleshooting for the indicated DTCs.
  1. If you can't check the DTC and the MIL stays on, do the MIL circuit troubleshooting.
  1. If you can't check the DTC and the PGM-FI display stays on, check symptoms for the starting system.