Dtc C1121 / C1123 / C1124: Vss Circuit Failure - Suzuki Swift Sport 2004 Service & Repair Manual

6C-26 Power Assisted Steering System:

DTC C1121 / C1123 / C1124: VSS Circuit Failure

DTC C1121: No Vehicle Speed Signal (60 Seconds or More)
DTC C1123: No Vehicle Speed Signal (30 Seconds or More)
DTC C1124: Vehicle Speed Performance (Impossible Deceleration)
Wiring Diagram
10
4
2
BLK
4
WHT
WHY
1
4
12V
5
RED
WHT
6
BLK RED/
BLK
WHT WHT
7
BLK WHT/
BLK
[A]: Connector "E52" (viewed from harness side)
[B]: Connector "E49" (viewed from harness side)
1. Main fuse box
2. Ignition switch
3. Junction block assembly
DTC Detecting Condition and Trouble Area
DTC detecting condition
DTC C1121:
Vehicle speed signal is 0 km/h even though engine speed
is more than 4000 rpm for more than 60 seconds
continuously (before elapse of 5 min from engine start) or
vehicle speed signal is 0 km/h even though engine speed
is more than 2500 rpm for more than 60 seconds
continuously (after elapse of 5 min for engine start).
(1 driving cycle detection logic but MIL does not light up)
DTC C1123:
Vehicle speed signal is 0 km/h with continuously more
than 3 driving cycles even though engine speed is more
than 4000 rpm for more than 30 seconds continuously
(before elapse of 5 min from engine start) or vehicle speed
signal is 0 km/h with continuously more than 3 driving
cycles even though engine speed is more than 2500 rpm
for more than 30 seconds continuously (after elapse of 5
min for engine start).
(3 driving cycle detection logic)
DTC C1124:
Vehicle speed signal is less than 5 km/h for more than 5
seconds continuously with more than specified
deceleration speed (–20 m/s
(1 driving cycle detection logic but MIL does not light up)
GRN
E49-1
3
4
LT GRN
GRN
E52-1
/BLK
11
E23-25 PPL
E52-4
12V
RED/
E23-26 E52-14
BLU
BRN
E23-4 E52-12
12
E49-2
BLK
9
4. Fuse
5. ECM
6. Left-front wheel speed sensor
7. Right-front wheel speed sensor
8. P/S control module
2 ) from over 20 km/h.
8
12V
5V
E51-1
E51-2
[A ]
Trouble area
• Vehicle speed signal circuit
• Wheel speed sensor
• ECM
• P/S control module
• ABS/ESP® control module
• CAN communication circuit
S7RS0B6304017
[B ]
BLK 1
M
RED
2
11 12 13 14 15 16 17 18 19 20
1 2 3 4 5 6 7 8 9
I7RS0B630009-01
9. ABS/ESP® control module
10. Individual circuit fuse box No.1
11. Vehicle speed signal circuit
12. Engine speed signal circuit
10