Suzuki Swift Sport 2004 Service & Repair Manual page 913

DTC Detecting Condition and Trouble Area
DTC detecting condition
DTC C1141:
Voltage between both motor drive circuits is more than 8.5
V or less than 0.2 V for 0.5 seconds continuously while
motor is not drived
(1 driving cycle detection logic)
DTC C1142:
Measured motor drive current is more than 10 A as
compared with target motor drive current.
(1 driving cycle detection logic)
DTC C1143:
Measured motor drive current is more than 50 A.
(1 driving cycle detection logic)
DTC C1145:
Measured motor drive current is less than 2 A
continuously for more than 3 seconds even though target
motor drive current is more than 4 A.
or
Measured motor drive current is less than 0.8 A for total 1
second even though motor control duty is more than 90%
while target motor drive current is less than 8 A.
(1 driving cycle detection logic)
DTC Troubleshooting
Step
1 Was "EPS System Check" performed?
2 DTC check
Is DTC C1153 and/or DTC C1155 indicated together?
3 Power supply and ground circuit check
1) Check P/S control module power supply and ground
circuit referring to "P/S Control Module Power Supply
and Ground Circuit Check".
Is it in good condition?
4 Motor circuit check
1) With ignition switch tuned OFF, disconnect P/S motor
connector ("E51").
2) Check that P/S motor circuit is as follows.
• Insulation resistance of wire harness is infinity
between each "P/S motor circuit" terminal and other
terminal at P/S motor connector.
• Wiring harness resistance of each "P/S motor circuit"
is less than 1 Ω.
• Insulation resistance between each "P/S motor circuit"
and vehicle body ground is infinity.
• Circuit voltage between each "P/S motor circuit" and
ground circuit is 0 – 1 V with ignition switch turned
ON.
Is circuit in good condition?
5 P/S motor check
1) Check motor and its circuit referring to "P/S Motor and Its
Circuit Inspection".
Is motor in good condition?
Action
Power Assisted Steering System:
Trouble area
• P/S motor circuit
• P/S motor
• P/S control module
Yes
Go to Step 2.
Go to applicable DTC
diag. flow.
Go to Step 4.
Go to Step 5.
Substitute a known-
good P/S control
module, and recheck.
6C-31
No
Go to "EPS System
Check".
Go to Step 3.
Repair or replace
defective circuit.
Repair or replace
defective circuit.
Replace the steering
gear case assembly.