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Generator Control Signal Circuit Check
Wiring Diagram
Circuit Description
ECM sends signal (0 – 1 V) to generator terminal C to suspend charging during vehicle take off or fast acceleration.
Troubleshooting
Step
1
Check generator control signal circuit
1) Check voltage at terminal "C41-12" under each condition
given as follows (vehicle at stop).
Voltage at terminal "C41-12"
While engine running: 10 – 14 V
While engine running at 2000 rpm or less and
throttle valve is not totally closed: 0 – 1 V
Is check result satisfactory?
1
GEN
C
C41 (31P)
9
8
7
6
5
4
3
2
1
21
20
19
18
17
16
15
14
13
12
11
10
31
30
29
28 27
26
25
24
23
22
Action
Engine General Information and Diagnosis:
RED/BLU
C41-12
G04 (24P)
7
6
5
4
3
2
1
6
16
15
14
13 12
11
10
9
8
12
24
23
22
21
20
19
18
17
17
1. Generator
Generator control signal
circuit is in good
condition.
ECM
12V
G03 (17P)
5
4
3
2
1
11
10
9
8
7
16
15
14
13
Yes
"RED/BLU" wire open or
short. Poor "C41-12"
terminal connection.
If wire and connection
are OK, substitute a
known-good ECM and
recheck.
1A-106
S3RH0B1104054
I2RH0B110090-01
No
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