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P/S System Symptom Diagnosis - Suzuki SX4 Service Manual

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Motor Drive Voltage (V)
This parameter indicates the voltage between motor
terminals.
System Power Status (EPS System Power, ON, OFF)
This parameter indicates input status of EPS system
power supply.
IGN switch Status (ON, OFF)
This parameter indicates the condition of the power
supply through the ignition switch.

P/S System Symptom Diagnosis

This section describes trouble diagnosis of the P/S system parts whose trouble is not indicated by the on-board
diagnostic system (self-diagnostic function). When no malfunction is indicated by the on-board diagnostic system
(self-diagnosis function) and assuredly those steering basic parts as described in "Steering Symptom Diagnosis in
Section 6A" are all in good condition, check the following power steering system parts which may be a possible cause
for each symptom of the steering.
Condition
Steering wheel feels
heavy (Perform "Steering
Force Check:" before
diagnosis.)
Steering wheel feels
heavy momentarily when
turning it to the left or
right
Poor recovery from turns Poor performance of torque sensor
Vehicle pulls to one side
during straight driving
Abnormal noise
No idle up
Possible cause
Steering wheel installed improperly
(twisted)
Poor performance of P/S motor
Poor performance of torque sensor
Steering gear case assembly
malfunction
Poor performance of vehicle speed
signal from BCM
Steering gear case assembly
malfunction
Steering gear case assembly
malfunction
Poor performance of torque sensor
Steering gear case assembly
malfunction
P/S motor (built in steering gear case
assembly) malfunction
P/S control module faulty
Power Assisted Steering System:
Torque sensor Status (ON, OFF)
This parameter indicates the output status of the torque
sensor power supply.
Fail Safe FET Status (ON, OFF)
This parameter indicates the status of the motor drive
power supply circuit.
Correction / Reference Item
Install steering wheel correctly.
Check P/S motor referring to "P/S Motor and
Its Circuit Inspection".
Check torque sensor referring to "Torque
Sensor and Its Circuit Inspection".
Replace steering gear case assembly.
Check vehicle speed signal circuit referring to
"DTC C1121 / C1123 / C1124: Vehicle Speed
Signal Circuit Failure".
Replace steering gear case assembly.
Check torque sensor referring to "Torque
Sensor and Its Circuit Inspection".
Replace steering gear case assembly.
Check torque sensor referring to "Torque
Sensor and Its Circuit Inspection".
Replace steering gear case assembly.
Replace steering gear case assembly.
Check P/S control module referring to
"Inspection of P/S Control Module and Its
Circuits".
6C-13
S7RW0A6304008

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