Dtc C1155: P/S Control Module Internal Failure - Suzuki SX4 Service Manual

6C-28 Power Assisted Steering System:
DTC Troubleshooting
Step
1 Was "EPS System Check" performed?
2 Battery voltage check
1) Check circuit fuse for P/S control module.
2) If OK, measure voltage between positive (+) battery
terminal and vehicle body ground with engine running.
Is voltage 10 V or more?
3 P/S control module power supply circuit check
Check power supply circuit and ground circuit for P/S control
module referring to "P/S Control Module Power Supply and
Ground Circuit Check".
Is check result in good condition?

DTC C1155: P/S Control Module Internal Failure

Wiring Diagram
Refer to "DTC C1153: P/S Control Module Power Supply Circuit".
DTC Detecting Condition and Trouble Area
DTC detecting condition
Internal memory (EEPROM) is data error.
(In this case, "EPS" warning light does not light up)
or
Internal circuit is faulty.
or
Power supply voltage of P/S control module exceeded
17.5 V
(1 driving cycle detection logic)
DTC Troubleshooting
Step
1 Was "EPS System Check" performed?
2 P/S control module power supply and ground circuit
check
Check power supply circuit and ground circuit for P/S control
module referring to "P/S Control Module Power Supply and
Ground Circuit Check".
Is check result in good condition?
3 Battery voltage check
1) Check voltage between positive (+) battery terminal and
vehicle body ground with engine speed at 3000 rpm.
Is voltage 15.5 V or less?
Action
Action
Yes
Go to Step 2.
Go to Step 3.
Substitute a known-
good P/S control
module and recheck.
Trouble area
• Generator
• P/S control module
Yes
Go to Step 2.
Go to Step 3.
Replace P/S control
module.
No
Go to "EPS System
Check".
Check charging system
referring to "Generator
Test (Undercharged
Battery Check) in
Section 1J".
Repair defective circuit.
S7RW0A6304018
No
Go to "EPS System
Check".
Repair or replace
defective circuit.
Check charging system
referring to "Generator
Test (Overcharged
Battery Check) in
Section 1J".