Alternator output and power demand of all electrical loads and systems must be matched to each other as ideally as possible so that the entire system is reliable and trouble-free in operation. The ECM monitors alternator output deviation from the signal of the FR terminal of the alternator when the engine is running
ECM sets DTC P0626 if the ECM detects output duty signal higher than the possible range of a properly operating alternator
Item
Detecting Condition
Possible Cause
DTC Strategy
? Electrical Check
? Open or short to ground in harness
? Faulty charging system
Enable Conditions
? Time after ignition ON > 0.1sec.
? Engine speed=0
? No main relay error
Threshold Value
? Alternator load > 35%
Diagnostic Time
? 1 sec.