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Suzuki SX4 Service Manual page 957

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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 "EPS" warning light
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 "EPS" warning light
does not light up)
DTC Troubleshooting
Step
1
Was "EPS System Check" performed?
2
DTC check
1) DTC check for ECM referring to "DTC Check in Section
1A".
Is there any DTC detected?
3
Vehicle spec check
Is vehicle equipped with A/T?
4
DTC check
1) Check TCM for DTC referring to "DTC Check in Section
5A".
Is there any DTC detected?
5
DTC check
1) Check ABS control module and BCM for DTC referring
to "DTC Check in Section 4E" and "DTC Check in
Section 10B".
Is there any DTC detected?
2
) from over 20 km/h.
Action
Power Assisted Steering System:
Trouble area
• Vehicle speed signal circuit
• BCM
• ECM
• TCM (A/T model)
• ABS control module (M/T model)
• P/S control module
• CAN communication line circuit
Yes
Go to Step 2.
Go to applicable DTC
diag. flow.
Go to Step 4
Go to applicable DTC
diag. flow.
Go to applicable DTC
diag. flow.
6C-23
No
Go to "EPS System
Check".
Go to Step 3.
Go to Step 5
Go to Step 6.
Go to Step 6.

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