ECM Power and Ground Supply

Power And Ground Circuit Diagnostic Chart:

Power And Ground Circuit:

DIAGNOSTIC CHART AND DIAGRAM

Fuel Pump And Main Relay:

1. CHECK OPERATION OF MAIN RELAY.
Turn ignition switch "ON" or "OFF" and check for main relay operating sound.

Connector B52:

2. CHECK HARNESS CONNECTOR OF MAIN RELAY CIRCUIT.
1) Disconnect (852) connector from main relay.
2) Turn ignition switch to "ON".

3) Measure voltage between (852) connector terminals and body.

Connector & Terminal/Specified value
(B52) No. 2 - Body/10 V, min.
(B52) No. 4 - Body/10 V, min.
(B52) No. 5 - Body/10 V, min.

4) Turn ignition switch to "OFF", and connect connector (B33).

ECM Connector:

3. CHECK POWER SUPPLY CIRCUIT OF ECM.
1) Disconnect ECM connector.
2) Turn ignition switch to "ON".
3) Measure voltage between ECM connector (859) terminals and body.

Connector & Terminal/Specified value
(B59) No. 2 - Body/10 V, min.
(B59) No. 13 - Body/10 V, min.

ECM Connector:

4. CHECK GROUND CIRCUIT OF ECM.
Measure resistance between ECM connector and body.

Connector & Terminal/Specified value
(B59) No. 11 - Body/0 ohms
(B59) No. 22 - Body/0 ohms
(B62) No. 5 - Body/0 ohms
(B62) No. 14 - Body/O ohms
(B62) No. 24 - Body/0 ohms
(B62) No. 25 - Body/0 ohms