MPI – Troubleshooting
13-17
Code No. 64 Alternator FR terminal system Probable cause
Range of Check
D Engine speed is approx. 50 r/min or more
Set Conditions
D The input voltage from the alternator FR terminal is higher than 4.5 V for 20 seconds.
D Open circuit in alternator FR terminal circuit
D Malfunction of the engine-ECU
Measure at the alternator connector A-05.
D Connect the connector. (Use the test harness: MB991519.)
D Voltage between 4 (blue clip) and earth
(Engine: Idling)
(Radiator fan: Stopped)
(Headlamp: OFF → ON)
(Brake lamp: OFF → ON)
(Rear window defogger switch: OFF → ON)
OK: Voltage drops 0.2 to 3.5 V
OK
Replace the engine-ECU.
NG
Measure at the alternator connector A-05.
D Disconnect the connector, and measure at the harness side.
D Voltage between 4 and earth
(Ignition switch: ON)
OK: 4.8 – 5.2 V
NG
Check the following
connectors: B-60, A-88
NG
Repair
OK
Check trouble symptom.
NG
Check the harness wire
between the engine-ECU
and the alternator con-
nector.
NG
Repair
OK
Replace the engine-ECU.
OK
Check the following connector: A-05
NG
Repair
OK
Check trouble symptom.
NG
Check the harness wire between the engine-ECU and the alternator
connector.
NG
Repair
OK
Replace the alternator.
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