Dtc P0620: Generator Control Circuit - Suzuki GRAND VITARA Owner's Manual

1A-161 Engine General Information and Diagnosis:

DTC P0620: Generator Control Circuit

System and Wiring Diagram
15 14 13 12 11
30 28 27 26
29
45 44 43 42 41
59
60 58 57 56
1. Generator
2. IC regulator
Generator Control System Description
Refer to "Generator Control System Description: ".
DTC Detecting Condition and Trouble Area
DTC detecting condition
• Battery voltage is higher than specification even through
generator control is maximum regulation (duty 100%).
• Battery voltage is lower than specification even through
generator control is minimum regulation (duty 0%) and electric
load is less than 20 A.
DTC Confirmation Procedure
1) With ignition switch turned OFF, connect scan tool to DLC
2) Turn ON ignition switch and clear DTC.
3) Make sure that all accessory switches are tuned OFF.
4) Start engine and warm it up to normal operating temperature (ECT approx. 90 – 95 °C, 193 – 203 °F).
5) Turn ON the following accessory switches.
• Head light switch.
• Blower motor switch (max position).
• Rear defogger switch.
6) Increase engine speed to 4000 rpm and keep it for 10 sec or more.
7) Decrease engine speed to idle.
8) Check DTC and pending DTC.
1
2
3
E
E23
10 9 8 7 6 5 4 3
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40 39 38 37 36 35 34 33
52 51 50 49
55 54 53 48
3. Field coil
4. ECM
B
5
IG
L
FR
BRN/BLK
C
BRN/BLK
2 1 15 14 13 12 11
17 16 30 28 27 26
29
32 31 45 44 43 42 41
47 46 60 59 58 57 56
Generator and/or its circuit
Electric load current sensor (for J20 engine)
ECM
4
C37-8
C37-28
C37
10 9 8 7 6 5 4 3
25 24 23 22 21 20 19 18
40 39 38 37 36 35 34 33
55 54 53 52 51 50 49 48
5. Ignition switch
6. Charge lamp
Trouble area
S5JB0A1104090
2 1
17 16
32 31
47 46
I5JB0A110063-01