6 - 25 FUEL INJECTION SYSTEM FI FI Fault code No. 46 Symptom Power supply is not normal. Diagnostic code No. — — Order Item/components and probable cause Check or maintenance job Reinstatement method 1 Connections • Main wire harness-ECU coupler • Check the coupler for any pins that may be pulled out. • Check the locking condition of the coupler. • If there is a malfunction, repair it and connect the coupler securely. Starting the engine and operating it at idle. 2 Faulty battery. • Replace or charge the battery. Refer to “CHECKING AND CHARGING THE BATTERY” in chapter 3. 3 Malfunction in rectifier/regulator • Replace if defective. Refer to “CHARGING SYSTEM” in chapter 9.
4 Open or short circuit in wire har- ness. • Repair or replace if there is an open or short circuit. • Between battery lead and main switch coupler (red–red) • Between main switch coupler and ignition fuse (brown/blue–brown/blue) • Between ignition fuse and ECU coupler (brown–brown) Fault code No. 50 Symptom Faulty ECU memory. (When this malfunction is detected in the ECU, the fault code number might not appear on the meter.) Diagnostic code No. — — Order Item/components and probable cause Check or maintenance job Reinstatement method 1 Malfunction in ECU. Replace the ECU. NOTE: Do not perform this procedure with the main switch turned to “ON”. Turning the main switch to “ON”.