DLC Circuit Troubleshooting
  1. Check for continuity between ECM/PCM connector terminal A20 and body ground.
Is there continuity?
YES -
Go to Step 85 .
NO -
Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM, then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM. ■
  1. Continue to check for continuity between ECM/PCM connector terminal A20 and body ground while disconnecting the A/C pressure sensor 3P connector.
Is there continuity?
YES -
Repair short in the wire between the ECM/PCM (A20) and the A/C pressure sensor.■
NO -
Replace the A/C pressure sensor.■