STEP 2. Measure the power supply voltage at ignition coil connectors.
(1) Disconnect the ignition coil connectors and measure at the harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal power supply line and ground.- Voltage should be battery positive voltage.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is battery positive voltage (approximately 12 volts) present?
Go to Step 3. Repair or replace the connector(s), or check and repair the harness of short to ground and open circuit in power supply line between MFI relay connector and ignition coil connectors. Then confirm that the malfunction symptom is eliminated.