Pinout Values and Diagnostic Parameters

ELECTRONIC CONTROLLED UNIT (ECU)

INSPECTION OF ECU

NOTE: The EFI circuit can be checked by measuring the voltage and resistance at the wiring connectors of the ECU.

1. Preparation:
(a) Disconnect the connectors from the ECU.





(b) Remove the locks as shown in the illustration so that the tester probe(s) can easily come in.

NOTE: Pay attention to sections "A" and "B" as shown in the image, which can be easily broken.

(c) Reconnect the connectors to the ECU.

NOTE:

- Perform all voltage measurements with the connectors connected.

- Verify that the battery voltage is 11 V or more when the ignition switch is in the "ON" position.





- Using a voltmeter with high impedance (10 k-ohms/V minimum), measure the voltage at each terminal of the wiring connectors.




Terminals of ECU

2. Inspect voltage of ECU

Check the voltage between each terminal of the wiring connectors.

(a) Turn the ignition switch ON.

(b) Measure the voltage at each terminal.

VOLTAGE AT ECU WIRING CONNECTORS




NOTE: If a problem is found, refer to correct test number indicated at left column of chart, as shown in image.

Component Tests and General Diagnostics

INSPECT RESISTANCE OF ECU

CAUTION:

- Do not touch the ECU Terminals.

- The tester probe should be inserted into the wiring connector from the wiring side.

1. Check the resistance between each terminal of the wiring connectors.

2. Disconnect the connectors from the ECU.





3. Measure the resistance at each terminal.




Resistance of ECU Wiring Connectorswww.realtor.com