DLC Circuit Troubleshooting - PGM-FI System
NOTE: Make sure the HDS and the DLC cable of the HDS is normal.
  1. Turn the ignition switch OFF.
  1. Connect the HDS to the DLC.
    NOTE: Make sure the HDS is properly connected to the DLC.
  1. Turn the ignition switch ON (II), and read the HDS.
Does the HDS identify the vehicle?
YES -
Go to Step 4 .
NO -
Go to Step 21 .
  1. Check for Temporary DTCs or DTCs in the PGM-FI system with the HDS.
Are any Temporary DTCs or DTCs indicated?
YES -
Go to the indicated DTC's troubleshooting.■
NO -
Go to Step 5 .
  1. Turn the ignition switch OFF.
  1. Turn the ignition switch ON (II), and watch the SRS indicator.
Does the SRS indicator stay on?
YES -
Go to the SRS system's general troubleshooting information. ■
NO -
Go to Step 7 .
  1. Turn the ignition switch OFF.
  1. Turn the ignition switch ON (II), and watch the VSA indicator.
Does the VSA indicator stay on?
YES -
Go to the VSA system's general troubleshooting information. ■
NO -
Go to Step 9 .
  1. Turn the ignition switch OFF.
  1. Turn the ignition switch ON (II), and watch the EPS indicator.
Does the EPS indicator stay on?
YES -
Go to the EPS system's general troubleshooting information. ■
NO -
Go to Step 11 .
  1. Turn the ignition switch OFF.
  1. Turn the ignition switch ON (II), and watch the immobilizer indicator.
Does the immobilizer indicator stay on or flash?
YES -
Go to the immobilizer system's troubleshooting. ■
NO -
Go to Step 13 .
  1. Do the gauge self-diagnostic function.
  1. Check for B-CAN system DTCs without the HDS.
Are any B-CAN DTCs indicated?
YES -
Go to the indicated DTC's troubleshooting.■
NO -
Go to Step 15 .
  1. Turn the ignition switch OFF.
  1. Disconnect the HDS from the DLC.
  1. Check for continuity between DLC terminal No. 7 and body ground.
Is there continuity?
YES -
Go to Step 18 .
NO -
Go to Step 19 .
  1. Continue to check for continuity between DLC terminal No. 7 and body ground, while disconnecting these parts, one at a time:
    • SRS unit connector A (28P)
    • VSA control unit 37P connector
    • EPS control unit connector D (28P)
    • Immobilizer-keyless control unit 7P connector
    • Audio unit 17P connector
    • Under-dash fuse/relay box (Q) (16P) connector
Does continuity go away when one of the above components is disconnected?
YES -
Replace the part that caused an open when it was disconnected.■
NO -
Repair short in the wire between the DLC (K-line) and the VSA control unit, the SRS unit, the EPS control unit, the immobilizer control unit-receiver, the audio unit, or the under-dash fuse/relay box.■