DTC P0622: Generator FR Terminal Circuit Malfunction

CIRCUIT OPERATION
• The ECM (terminal No. 41) <M/T> or PCM (terminal No. 54) <A/T> apply a battery positive voltage into the generator FR terminal No. 4 via resistance inside the unit.
TECHNICAL DESCRIPTION
• When the generator field coils are controlled, the generator FR terminal inputs signal to the ECM <M/T> or PCM <A/T>.
• The ECM <M/T> or PCM <A/T> detects the generator output with the input signal, and controls the idle air control motor according to the generator output.
DTC SET CONDITIONS

Check Condition
Engine speed is higher than 50 r/min.

Judgement Criterion
• Input voltage from the generator FR terminal has continued to be approximately battery positive voltage for 20 seconds.
TROUBLESHOOTING HINTS (The most likely causes for this code to be set area:
• Open circuit in generator FR terminal circuit.
• ECM failed. <M/T>
• PCM failed. <A/T>