8574879-8574863-8574796-8574909-8574966-8574887

Component Location

General Description

PCM monitors the normality of PWM signal in alternator's FR circuit by comparing with the criterion value under IG ON state.

The signal duty is directly propotional to electrical load.

DTC Description

P0625 is set when the PWM signal(Low side) in FR circuit is below 80% during engine stop state.

P0625 is set when the PWM signal(Low side) in FR circuit is below 3% during engine running state.

DTC Detecting Condition

Item		Detecting Condition	Possible Cause
Case 1	DTC Strategy	• IG ON	1. Circuit shorts to ground 2. Charging system
	Enable Conditions	• More than 3 sec after IG ON • Engine stop • No fault on a main rely • 10 V＜ Battery voltage ＜ 16 V
	Threshold Value	• FR circuit Duty < 80% • Minimum voltage of Low level duty signal ≥ 1.5V
	Diagnostic Time	• 1 Second
Case 2	DTC Strategy	• Engine running
	Enable Conditions	• More than 100 sec after engine running • Engine RMP : 600rpm ~ 4000rpm • No fault on a main rely • 10 V ＜ Battery voltage ＜ 16 V
	Threshold Value	• FR circuit Duty < 3%
	Diagnostic Time	• 20 Seconds
Mil On Condition		• No MIL

Diagnostic Circuit Diagram

note

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Signal Waveform & Data

Case 1

● The normal FR circuit duty signal under IG ON state

→ Low level voltage ＜ 1.5V : Normality , Low level voltage ≥ 1.5V : Abnormality

Case 2

● The normal FR circuit duty signal under engine running state

→ 5% < FR circuit duty < 95% : Normality , FR circuit duty < 3% : Abnormality