Preparation & Procedure

TROUBLESHOOTING FOR EFI ELECTRONIC CIRCUIT WITH VOLT/OHMMETER

Location Of Fuses And Fusible Links:

HINT: Because the following troubleshooting procedures are designed for inspection of each separate system, the actual troubleshooting procedure may vary somewhat.

However, please refer to these procedures and perform actual troubleshooting, conforming to the inspection methods described.

For example, it is better to first make a simple check of the fuses, fusible links and connecting condition of the connectors before making your inspection according to the procedures listed.

These troubleshooting procedures are based on the supposition that the trouble lies in either a short or open circuit in a component outside the computer or a short circuit within the computer.

If engine trouble occurs even though proper operating voltage is detected in the computer connecttor, then the engine (engine and ECT) ECU is faulty and should be replaced.






EFI SYSTEM CHECK PROCEDURE (2WD & 4 WD)

HINT:
* The EFI circuit can be checked by measuring the resistance and voltage at the wiring connectors of the ECU.
* Perform all voltage measurement with the connectors connected.
* Verify that the battery voltage is 11 V or above when the ignition switch is ON.

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