2007 SUZUKI SWIFT Signal

Downloaded from www.Manualslib.com manuals search engine 6C-10 Power Assisted Steering System:
) C1121 No vehicle speed signal
(60 seconds or more) 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). • Vehicle speed signal circuit
• Wheel speed sensor
•ECM
• P/S control module
• ABS control module
• CAN communication circuit
Not
applicable
) C1122 Engine speed signal Engine speed signal is less than
220 rpm for more than 0.8
seconds.
or
Engine speed signal is less than
220 rpm for more than 20
seconds continuously even
though vehicle speed signal is
more than 50 km/h.• Engine speed signal circuit
•ECM
• P/S control module
• Vehicle speed signal
1 driving
cycle
) C1123 No vehicle speed signal
(30 seconds or more) 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). • Vehicle speed signal circuit
• Wheel speed sensor
•ECM
• P/S control module
• ABS control module
• CAN communication circuit
3 driving
cycles
) C1124 Vehicle speed performance
(Impossible deceleration) Vehicle speed signal is less than 5
km/h for more
than 5 seconds
continuously with more than
specified deceleration speed (–20
m/s
2) from over 20 km/h. Not
applicable
) C1141 P/S motor circuit voltage 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.
• P/S motor circuit
• P/S motor
• P/S control module1 driving
cycle
) C1142 P/S motor circuit range /
performance Measured motor drive current is
more than 10 A as compared with
target motor drive current. 1 driving
cycle
DTC No. Detecting item
Detecting condition
(DTC will set when detecting) Trouble area MIL

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Scan Tool Data Definitions
Battery Voltage
This parameter indicates battery positive voltage.
TQS Power Supply (Torque Sensor Power Supply, V)
This parameter indicates the power supply voltage which
the P/S control module supplies to the torque sensor.
TQS Main Torque (Torque Sensor Main Torque, N ⋅m)
The torque sensor is installed to detect the steering force
and the steering directio n. It consists of two
potentiometers and the main torque sensor is one of
these.
TQS Sub Torque (Torque Sensor Sub Torque, N ⋅m)
The torque sensor is installed to detect the steering force
and the steering directio n. It consists of two
potentiometers and the sub-torque sensor is one of
these. Its output characteristics are compared with those
of the main torque sensor.
Assist Torque (N ⋅m)
This parameter is an internal parameter of the P/S
control module. It is obtained by computing the torque
sensor input signal. Motor Control (Motor Control Current, A)
Based on the input signal, the P/S control module
determines the assist amount
and controls the current to
the motor suitable for that a ssist amount. This parameter
indicates that control value.
Motor Monitor (Motor Monitor Current, A)
This parameter indicates the actually measured value of
the current flowing to the motor. The motor circuit
condition is diagnosed by co mparing this parameter with
“Motor Control” parameter described previously.
Vehicle Speed (km/h, MPH)
Vehicle speed signal is fed from BCM. P/S control
module determines the amount of power assist based on
this vehicle speed signal and the torque sensor signal.
Engine Speed (rpm)
Engine speed signal is fed from the ECM so that it can
be used for trouble diagnos is of the electric power
steering system.
Motor Volt (V)
This parameter indicates the voltage between motor
terminals.
Ignition switch (ON, OFF)
This parameter indicates the condition of the power
supply through the ignition switch.
Visual InspectionS7RS0B6304007
Visually check the following pats and system.
P/S System Symptom DiagnosisS7RS0B6304008
This section describes trouble diagnosis of the P/S system parts whose trouble is not indicated by the on-board
diagnostic system (self-diagnostic functi on). When no malfunction is indicated by the on-board diagnostic system
(self-diagnosis function) and those stee ring basic parts as described in “Steering Symptom Diagnosis in Section 6A”
are all in good condition, check the following power steer ing system parts which may be a possible cause for each
symptom of the steering. Inspection Item Referring section
Battery Level, leakage, color “Batte ry Description in Section 1J”
Connectors of electric wire
harness Disconnection friction “Intermittent and Poor
Connection Inspection in Section 00”
Fuses Burning “Cautions in Body Electric al System Servicing in Section 9A”
Parts Installation, damage
Other parts that can be checked visually
Condition Possible cause Correction / Reference Item
Steering wheel feels
heavy (Perform “Steering
Force Check” before
diagnosis.) Steering wheel installed improperly
(twisted)
Install steering wheel correctly.
Poor performance of torque sensor Check torque sensor referring to “Torque
Sensor and Its Circuit Inspection”.
Poor performance of P/S motor Check motor referring to “P/S Motor and Its
Circuit Inspection”.
Steering gear case assembly faulty Replace.
Poor performance of vehicle speed
signal from ECM Check vehicle speed signal circuit referring to
“DTC C1121 / C1123 / C1124: VSS Circuit
Failure”.

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DTC C1113: Steering Torque Sensor (Main and Sub) Circuit CorrelationS7RS0B6304012
Wiring Diagram
DTC Detecting Condition and Trouble Area
DTC Troubleshooting
M
5V
BLK
RED
WHT BLU
GRN
BRN YEL
E51-1
E51-2
E52-18
E53-5
E53-7
E52-6
E52-8
E53-2
E52-9
E52-16
E52-19
GRY
[A ]
12 3
4 5 67
89
11
10
12 13
141516
17 18 19 20
5
67
12V
5V
5V
12V
REDE52-20E53-6
E53-4
E53-1
109
1
2
[B ]
[C ]
7654321
LT GRN
/BLKE52-1 E49-1
GRNGRNWHTBLK
WHY
8
3
4
4
4
4
1 2
E49-2BLK
I7RS0B630005-01
[A]: Connector “E52” (viewed from harness side)
3. Junction block assembly 8. Individual circuit fuse box No.1
[B]: Connector “E49” (viewed from harness side )4. Fuse 9. Torque sensor signal (sub) circuit
[C]: Connector “E53” (viewed from harness side) 5. P/S control module 10. Torque sensor signal (main) circuit
1. Main fuse box 6. Torque sensor
2. Ignition switch 7. Torque sensor amplifier
DTC detecting condition Trouble area
Voltage difference between torque sensor main signal and
sub signal is more than 0.6 V for 1 second continuously
(1 driving cycle detection logic) • Torque sensor signal circuit
• Torque sensor
• P/S control module
Step
Action YesNo
1 Was “EPS System Check” performed? Go to Step 2.Go to “EPS System
Check”.
2 DTC check
Is DTC C1114 and/or DTC C1119 indicated together? Go to applicable diag.
flow.
Go to Step 3.
3 Torque sensor signal (sub) circuit check
1) Check for P/S control module connector (“E52”) for
proper connection.
2) With ignition switch turned OFF, disconnect torque sensor connector.
3) Check for voltage between “E53-7” (“BLU” wire) terminal and body ground with ignition switch ON.
Is it about 5 V? Go to Step 4.
Go to Step 7.

Downloaded from www.Manualslib.com manuals search engine 6C-18 Power Assisted Steering System:
4Torque sensor signal (main) voltage check
1) Check for voltage between “E53-5” (“WHT” wire)
terminal and body ground with ignition switch ON.
Is it about 0 V? Go to Step 5. Torque sensor signal
circuit is shorted to
other circuit.
5 Torque sensor signal (main) resistance check
1) Check for resistance “E53-5” (“WHT” wire) terminal and
body ground terminal with ignition switch OFF.
Is it about 1 M
Ω? Go to Step 6. Go to Step 8.
6 Torque sensor output voltage check
1) Connect connector to torque sensor with ignition switch
turned OFF.
2) Check torque sensor out put voltage referring to “Torque Sensor and Its Circuit Inspection”.
Is torque sensor in good condition? Substitute a known-
good P/S control
module and recheck.
Replace steering gear
case.
7 Torque sensor (sub) circuit wire check
1) Disconnect P/S control module.
2) Check that torque sensor signal (sub) circuit is as
follows.
• Insulation resistance of wire harness is infinity between “Torque sensor signal (sub) circuit” terminal
and other terminal at torque sensor connector.
• Wiring harness resistance of “Torque sensor signal (sub) circuit” is less than 1 Ω.
• Insulation resistance between “Torque sensor (sub) signal circuit” and vehicle body ground is infinity.
• Circuit voltage between “Torque sensor signal (sub) circuit” circuit and ground circuit is 0 – 1 V with ignition
switch turned ON.
Is circuit in good condition? Replace P/S control
module.
Repair or replace
defective circuit.
8 Torque sensor (main) circuit wire check
1) Disconnect P/S control module.
2) Check that torque sensor (main) signal circuit is as
follows.
• Insulation resistance of wire harness is infinity between “Torque sensor (main) signal circuit” terminal
and other terminal at torque sensor connector.
• Wiring harness resistance of “Torque sensor (main) signal circuit” is less than 1 Ω.
• Insulation resistance between “Torque sensor (main) signal circuit” and vehicle body ground is infinity.
Is circuit in good condition? Replace P/S control
module.
Repair or replace
defective circuit.
Step Action Yes No

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DTC C1117: Steering Torque Sensor Failure Signal Circuit LowS7RS0B6304014
Wiring Diagram
DTC Detecting Condition and Trouble Area
M
5V
BLK
RED
WHT BLU
GRN
BRN YEL
E51-1
E51-2
E52-18
E53-5
E53-7
E52-6
E52-8
E53-2
E52-9
E52-16
E52-19
GRY
[A ]
12 3
4 5 67
89
11
10
12 13
141516
17 18 19 20
5
67
12V
5V
5V
12V
REDE52-20E53-6
E53-4
E53-1
9
12
[B]
[C ]
7654321
LT GRN
/BLKE52-1 E49-1
GRNGRNWHTBLK
WHY
8
3
4
4
4
4
1 2
E49-2BLK
I7RS0B630007-01
[A]: Connector “E52” (viewed from harness side)
2. Ignition switch6. Torque sensor
[B]: Connector “E49” (viewed from harness side) 3. Junction block assembly7. Torque sensor amplifier
[C]: Connector “E53” (viewed from harness side) 4. Fuse8. Individual circuit fuse box No.1
1. Main fuse box 5. P/S control module9. Torque sensor internal failure signal circuit
DTC detecting condition Trouble area
Torque sensor internal failure signal circuit voltage is less
than 1.7 V when ignition switch turned ON
(1 driving cycle detection logic) • Torque sensor internal failure signal circuit
• Torque sensor
• P/S control module

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DTC Troubleshooting
DTC C1118: Steering Torque Sensor Failure Signal Circuit HighS7RS0B6304015
Wiring Diagram
Refer to “DTC C1117: Steering Torque Sensor Failure Signal Circuit Low”.
DTC Detecting Condition and Trouble AreaStep Action Yes No
1 Was “EPS System Check” performed? Go to Step 2. Go to “EPS System
Check”.
2 DTC check
Is DTC C1113, C1114 and/or DTC C1119 indicated together? Go to applicable diag.
flow.
Go to Step 3.
3 Torque sensor internal failure signal circuit check
1) Check for P/S control module connector (“E52”) for
proper connection.
2) With ignition switch turned OFF, disconnect torque sensor connector.
3) Check for voltage between “E53-1” (“YEL” wire) terminal and body ground with ignition switch ON.
Is it about 5 V? Go to Step 4. Go to Step 5.
4 Torque sensor internal failure signal circuit check
1) With ignition switch turned OFF, connect torque sensor
connector.
2) Check that voltage between “E52-16” (“YEL” wire) terminal and body ground is about 5V at the moment of
ignition switch turned ON.
Is it about 5 V? Substitute a known-
good P/S control
module and recheck.
Replace steering gear
case.
5 Torque sensor internal failure signal circuit wire check
1) Disconnect P/S control module.
2) Check that torque sensor failure signal circuit is as
follows.
• Insulation resistance of wire harness is infinity between “Torque sensor internal failure signal circuit”
terminal and other terminal at torque sensor
connector.
• Insulation resistance between “Torque sensor internal failure signal circuit” and vehicle body ground is
infinity.
Is circuit in good condition? Substitute a known-
good P/S control
module and recheck.
Repair or replace
defective circuit.
DTC detecting condition
Trouble area
Torque sensor internal failure signal circuit voltage is more
than 3.7 V for 1 second continuously
(1 driving cycle detection logic) • Torque sensor signal circuit
• Torque sensor internal failure signal circuit
• Torque sensor
• P/S control module

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DTC TroubleshootingStep Action Yes No 1 Was “EPS System Check” performed? Go to Step 2. Go to “EPS System
Check”.
2 DTC check
Is DTC C1113, C1114 and/or DTC C1119 indicated together? Go to applicable diag.
flow.
Go to Step 3.
3 Torque sensor internal failure signal voltage check
1) Check for P/S control module connector (“E52”) for
proper connection.
2) Check for voltage between “E52-16” (“YEL” wire) terminal and body ground with ignition switch ON.
Is voltage 0 – 1 V? Substitute a known-
good P/S control
module and recheck.
Go to Step 4.
4 Torque sensor internal failure signal circuit check
1) With ignition switch turned OFF, disconnect torque
sensor connector.
2) Check for voltage between “E53-1” (“YEL” wire) terminal and body ground with ignition switch ON.
Is it about 5 V? Go to Step 5. Go to Step 6.
5 Torque sensor internal failure signal circuit check
1) Disconnect P/S control module connector.
2) Check that torque sensor failure signal circuit is as
follows.
• Insulation resistance of wire harness is infinity between “Torque sensor internal failure signal circuit”
terminal and other terminal at torque sensor
connector.
Is circuit in good condition? Go to Step 7. Repair or replace
defective circuit.
6 Torque sensor internal failure signal circuit check
1) Disconnect P/S control module connector.
2) Check that torque sensor failure signal circuit is as
follows.
• Insulation resistance of wire harness is infinity between “Torque sensor internal failure signal circuit”
terminal and other terminal at torque sensor
connector.
• Wiring harness resistance of “Torque sensor internal failure signal circuit” is less than 1 Ω.
Is circuit in good condition? Substitute a known-
good P/S control
module and recheck.
Repair or replace
defective circuit.
7 Torque sensor signal circuit check
1) Check for torque sensor signal circuit referring to Step 3)
– 8) of “DTC C1113: Steering Torque Sensor (Main and
Sub) Circuit Correlation”.
Is torque sensor and its circuit in good condition? Replace steering gear
case.
Repair or replace
defective parts.

Downloaded from www.Manualslib.com manuals search engine 6C-26 Power Assisted Steering System:
DTC C1121 / C1123 / C1124: VSS Circuit FailureS7RS0B6304017
DTC C1121: No Vehicle Speed Signal (60 Seconds or More)
DTC C1123: No Vehicle Speed Signal (30 Seconds or More)
DTC C1124: Vehicle Speed Performance (Impossible Deceleration)
Wiring Diagram
DTC Detecting Condition and Trouble Area
M
BRNRED/
BLU
BLK
RED
E52-14
E52-12
E23-4
E23-26
E23-25 E51-1
E51-2
[A ]
12
3
4 5 67
89
11
10
12 13
141516
17 18 19 20
5V
PPL
E52-4
8
5
12V
E49-2BLK
12V
12V
6REDRED/ BLKWHT
7WHTWHT/BLKWHTBLK BLK
111
2
[B ]
9
LT GRN
/BLKE52-1 E49-1
GRNGRNWHTBLK
WHY
10
3
4
4
4
4
1 2
12
I7RS0B630009-01
[A]: Connector “E52” (viewed from harness side)
4. Fuse9. ABS/ESP® control module
[B]: Connector “E49” (viewed from harness si de)5. ECM 10. Individual circuit fuse box No.1
1. Main fuse box 6. Left-front wheel speed sensor11. Vehicle speed signal circuit
2. Ignition switch 7. Right-front wheel speed sensor 12. Engine speed signal circuit
3. Junction block assembly 8. P/S control module
DTC detecting condition Trouble area
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 MIL 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
2) from over 20 km/h.
(1 driving cycle detection logic but MIL does not light up) • Vehicle speed signal circuit
• Wheel speed sensor
•ECM
• P/S control module
• ABS/ESP®
control module
• CAN communication circuit