Dtc P0620: Generator Control Circuit - Suzuki Swift Sport 2004 Service & Repair Manual

Step
3 Wire circuit check
1) Disconnect starting motor control relay in individual
circuit fuse box No.1 with ignition switch turned OFF.
2) Check for proper connection to starting motor control
relay at "RED/WHT", "RED", "WHT", "YEL" (for A/T
model) and "YEL/GRN" (for M/T model) wire terminals.
3) Disconnect connector from starting motor.
4) Measure voltage between "C37-48" terminal of ECM
connector and vehicle body ground with ignition switch
turned ON.
Is voltage 0 – 1 V?
4 Wire circuit check
1) Measure voltage between "RED/WHT" wire terminal of
starting motor control relay connector and vehicle body
ground with ignition switch turned ON.
Is voltage 0 – 1 V?

DTC P0620: Generator Control Circuit

System and Wiring Diagram
15 14 13 12 11
30 29 28 27 26
44
45 43 42 41
60 59 58 57 56
1. Generator
2. IC regulator
Generator Control System Description
Refer to "Generator Control System Description".
Action
1
2
3
E
E23
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
3. Field coil
4. ECM
Engine General Information and Diagnosis:
Go to Step 4.
Check starting motor
control relay. If OK,
substitute a known-
good ECM and recheck.
B
5
IG
L
FR
BRN/BLK
C
BLU/YEL
2 1 15 14 13 12 11
17 16 30 29 28 27 26
44
32 31 45 43 42 41
47 46 60 59 58 57 56
Yes
For A/T model, "YEL" or
"YEL/GRN" wire is
shorted to power circuit.
For M/T model, "YEL/
GRN" wire is shorted to
power circuit.
If wires are OK,
substitute a known good
ECM and recheck.
Faulty ignition switch,
check ignition switch
referring to "Ignition
Switch Inspection in
Section 9C".
If ignition switch is OK,
check for short circuit
between ignition switch
and starting motor
control relay to power
circuit.
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
1A-137
No
S7RS0B1104057
2 1
17 16
32 31
47 46
I5RS0C110013-01