Introduction

TROUBLESHOOTING WITH VOLT/OHMMETER




LOCATION OF FUSES AND FUSIBLE LINK

HINT: The following troubleshooting procedures are designed for inspection of each separate system, therefore the procedure may vary somewhat. However, troubleshooting should be performed referring to the inspection methods described in this database.
Before beginning inspection, it is best to first make a simple check of the fuses, fusible links and condition of the connectors.
The following 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 connector, then it can be assumed the engine ECU is faulty and should be replaced.

EFI SYSTEM CHECK PROCEDURE
PREPARATION
(a) Disconnect the connectors from the engine ECU.
(b) Remove the locks as shown in the illustration so that the tester probe(s) can easily come in.




NOTICE:Pay attention to sections "A" and "B" in the illustration which can be easily broken.

(c) Reconnect the connectors to the engine ECU.

HINT:
^ Perform all voltage measurements with the connectors connected.
^ Verify that the battery voltage is 11V or more when the ignition switch is in "ON" position.




Using a voltmeter with high impedance (10 K Ohm/Volt minimum), measure the voltage at each terminal of the wiring connectors.




ECU TERMINAL ID TABLE