PGM-FI System

DTC Troubleshooting (cont'd)

 11-66  

  1. Check for continuity between ECM connector terminal E6 and body ground.

ECM CONNECTOR E (31P)

Wire side of female terminals

Is there continuity?

YES - Repair short in the wire between the ECM (E6) and the secondary HO2S (Sensor 2).

NO - Substitute a known-good ECM and recheck (see page 11-5). If symptom/indication goes away, replace the original ECM.

  1. Measure voltage between the secondary HO2S (Sensor 2) 4P connector terminal No. 4 and body ground.

SECONDARY HO2S (SENSOR 2) 4P CONNECTOR

Terminal side of male terminals

Is there battery voltage?

YES - Go to step 13.

NO - Check the No. 4 ACG (10A) fuse in the under-dash fuse/relay box. If the fuse is OK, repair open in the wire between the secondary HO2S (Sensor 2) and No. 4 ACG (10A) fuse.

  1. Turn the ignition switch OFF.
  1. Reconnect the secondary HO2S (Sensor 2) 4P connector.
  1. Disconnect ECM connector E (31P).
  1. Turn the ignition switch ON (II).
  1. Measure voltage between ECM connector terminal E6 and A5.

ECM CONNECTORS

Wire side of female terminals

Is there 0.1 V or less?

YES - Repair open in the wire between the ECM (E6) and the secondary HO2S (Sensor 2).

NO - Substitute a known-good ECM and recheck (see page 11-5). If symptom/indication goes away, replace the original ECM.