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Dtc C1122: Engine Speed Signal - Suzuki SX4 Service Manual

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6C-24 Power Assisted Steering System:
Step
6
Vehicle speed signal circuit check
1) With ignition switch turned OFF, disconnect connectors
from BCM.
2) Check BCM connector for proper connection.
3) If OK, turn ON ignition switch, measure voltage between
"G04-15" or "G04-22" wire terminal of BCM connector
and body ground.
Is voltage 4 – 5 V?
7
BCM voltage check
1) With ignition switch turned OFF, connect BCM
connector.
2) Check BCM for vehicle speed signal output referring to
"Inspection of P/S Control Module and Its Circuits".
Is it in good condition?
8
Vehicle speed signal circuit check
1) Check that vehicle speed signal circuit is as follows.
• Insulation resistance of wire harness is infinity
between "Vehicle speed signal" terminal and other
terminal at P/S control module connector.
• Wiring harness resistance of "Vehicle speed signal"
circuit is less than 1Ω.
• Insulation resistance between "Vehicle speed signal"
circuit and vehicle body ground is infinity.
• Circuit voltage between "Vehicle speed signal" circuit
and ground circuit is 0 – 1 V with ignition switch turned
ON.
Is it in good condition?

DTC C1122: Engine Speed Signal

Wiring Diagram
WHT
2
1
8
4
5
[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]: M15A engine with 4A/T equipped with slip control model (Hong Kong model)
1. Main fuse box
2. Ignition switch
Action
7
9
GRN
E13-1
3
10
LT GRN/
GRN
E11-1
BLK
BLK
E13-2
12V
E01-4
BRN
E11-12
[C]E01-44
11
Yes
Go to Step 7.
Replace P/S control
module.
Replace P/S control
module.
6
[A]
12V
12 13 14 15 16 17 18 19 20
11
3
4
1
2
3. Junction block assembly
4. Main fuse
5. ECM
6. P/S control module
7. Individual circuit fuse box No.1
No
Go to Step 8.
Replace BCM.
Repair or replace
defective circuit.
S7RW0A6304015
[B]
1
5
6
7
8
9
10
2
I6RW0D630004-01
8. "IGN" fuse
9. "P/S" fuse
10. "IG1 SIG" fuse
11. Engine speed signal circuit

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