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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) 13A-809 . CIRCUIT OPERATION • The battery positive voltage is applied from the MFI relay (terminal No. 2) to the ignition coil (ter- • A power voltage of 5 V is applied to the ignition coil (terminal No. 2) from the ECM (terminal No. . COMMENT • When the ECM turn the power transistor in the unit to OFF, the battery positive voltage is applied • When the power transistor in the ignition coil is turned to ON with any signal from the ECM, the . TROUBLESHOOTING HINTS (The most • Malfunction of the ignition coil. or connector damage. • Malfunction of the ECM. DIAGNOSIS STEP 1. Check the ignition coil. . Q: Are there any abnormalities? YES : Replace the ignition coil. Then confirm that the malfunction symptom is eliminated. NO : Go to Step 2. AK704226 Connector: A-34X MFI relay A-34X AB AK704255AB Connector: A-39 A-39 (B) AK704599AB B-02 (GR) B-03 (GR) B-04 (GR) B-06 (GR) Connectors: B-02, B-03, B-04 and B-06 AK704227 Connector: B-09 ECM B-09 (GR) AB |