Power Supply Testing

Warped Connectors:

***UPDATED BY TSB #EF91002 DATED MAY 1991
Some models may fail to start if the ECU connector is not fully seated. The connector may be cocked to one side or misaligned with the center bolt tightened due to the plastic encasement on the ECU or the electrical connector itself being warped.

Connector Clearance:

When installing the connector, secure it firmly by hand before tightening the bolt. When properly seated the top of the connector should not extend more than 7mm beyond the ECU case as shown in Fig. 2. The center bolt can be tightened without the connection being installed properly.

Fig. 3 Red Button:

On some models, a red plastic button will show when the connector is properly installed. Refer to Fig. 3.

WA2ECCS Circuit Diagnosis:

ECU MAIN POWER AND GROUND CIRCUIT TEST IMAGE

Main Power And Ground Circuit:

ECU MAIN POWER AND GROUND CIRCUIT DIAGRAM IMAGE

Fig. 4 ECCS (Main MFI) Relay And ECCS Control Unit (ECM) Location:

ECCS RELAY LOCATION