Dtc C1121 / C1123 / C1124: Vehicle Speed Signal Circuit Failure - Suzuki SX4 Service Manual

6C-22 Power Assisted Steering System:
Step
5 Torque sensor power supply circuit check
1) Check that torque sensor power supply circuit is as
follows.
• Insulation resistance of wire harness is infinity
between "Torque sensor power supply circuit" terminal
and each other terminal at torque sensor connector.
• Wiring harness resistance of "Torque sensor power
supply circuit" is less than 1 Ω.
• Insulation between "Torque sensor power supply
circuit" and vehicle body ground is infinity.
Is circuit in good condition?

DTC C1121 / C1123 / C1124: Vehicle Speed Signal 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
WHT
1 2
3
11
GRN
4
[A]: P/S control module connector No.1 "E11" (viewed from harness side)
[B]: P/S control module connector No.2 "E13" (viewed from harness side)
[C]: M/T model
[D]: A/T model
[E]: Junction block without BCM model (Taiwan model)
[F]: M15A engine with 4A/T equipped with slip control model (Hong Kong model)
1. Main fuse box
2. Ignition switch
Action
12V
12
GRN E13-1
13
LT GRN/
E11-1
BLK
E13-2
BLK
[A]
11 12 13 14 15 16 17 18 19 20
3 6 7
1 2 4 5 8
Yes
Replace P/S control
module.
8
BLU/
E11-11
WHT
5V
PPL
E11-4
14
RED/
E11-14
[F]E01-27
BLU
BRN
E11-12
[F]E01-44
[B]
1
9 10
2
3. Junction block assembly
4. Main fuse
5. ECM
6. BCM
7. Front left/right wheel speed sensor
8. P/S control module
9. ABS control module
10. Individual circuit fuse box No.1
Repair or replace
defective circuit.
6
E04-9
G04-15
[E]G04-22
5
[C]
12V
9
E01-26
12V
[D]
15
E01-4
C07-25
11. "IGN" fuse
12. "P/S" fuse
13. "IG1 SIG" fuse
14. Vehicle speed signal
15. TCM
16. Output shaft speed sensor
No
S7RW0A6304014
7
7
IG1
16
I6RW0D630003-01