2005 SUZUKI SWIFT gear

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Serial Data Link Circuit CheckS7RS0B6304009
CAUTION!
Be sure to perform “EPS System Check” before starting “Troubleshooting”.

Wiring DiagramVehicle pulls to one side
during straight driving
Poor performance of torque sensor
Check torque sensor referring to “Torque
Sensor and Its Circuit Inspection”.
Steering gear case assembly faulty Replace.
Poor recovery after turns Poor performance of torque sensor Check torque sensor referring to “Torque
Sensor and Its Circuit Inspection”.
Steering column faulty Replace.
Abnormal noise P/S motor (built in steering gear case
assembly) malfunction Replace steering gear case assembly.
No idle up P/S control module faulty Check P/S control module referring to
“Inspection of P/S Control Module and Its
Circuits”.
Condition Possible cause Correction / Reference Item
MBLK
RED
E52-11 E51-1
E51-2PPL/WHT
[A ]
12
3
4 5 67
89
11
10
12 13
141516
17 18 19 2010 9 8 7654 3 21
16 15 14 13 12 11
26 25 24 2322 21 20 19 18 17
32 31 30 29 28 27
[C]
8
79
12V
[B ]
11
12
GRY
LT GRN
/BLK
E52-1
E52-5
E49-1
GRNGRNWHTBLK
WHY
G28-25G28-31
RED/BLK
10
3
4
4
5 6
4
4
1 2
4
E49-2BLK
I7RS0B630003-01
[A]: Connector “E52” (viewed from harness side) 3. Junction block assembly 8. P/S control module
[B]: Connector “E49” (viewed from harness side) 4. Fuse 9. T o ECM, BCM, Air bag SDM control module and ABS control
module assembly
[C]: Connector “G28” (viewed from harness side) 5. Comb ination meter 10. Individual circuit fuse box No.1
1. Main fuse box 6. “EPS” warning light 11. Serial data circuit
2. Ignition switch 7. Date link connector (DLC)

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 TroubleshootingStep Action Yes No 1 Was “EPS System Check” performed? Go to Step 2. Go to “EPS System
Check”.
2 DTC check
Is DTC C1153 and/or DTC C1155 indicated together? Go to applicable DTC
diag. flow.
Go to Step 3.
3 Torque sensor 5 V reference power supply circuit
voltage check
1) With ignition switch turned OFF, disconnect torque
sensor connector and check for proper terminal
connection to torque sensor connector.
2) If connections are OK, check for voltage between “E53- 6” (“RED” wire) terminal and body ground with ignition
switch ON.
Is it approx. 5 V? Go to Step 4. Go to Step 5.
4 Torque sensor 5 V reference power supply circuit check
1) With ignition switch turned OFF, connect torque sensor
connector.
2) Check for P/S control module connector (“E52”) for proper connection.
3) Turn ignition switch ON.
4) Check for voltage between “Torque sensor 5 V reference power supply circuit” terminal and body ground with
connector (“E52”) connected to the P/S control module.
Is it about 5 V? Substitute a known-
good P/S control
module and recheck.
Replace steering gear
case.
5 Torque sensor 5 V reference power supply circuit check
1) With ignition switch turned OFF, disconnect P/S control
module connector.
2) Check that “Torque sensor 5 V reference power supply circuit” is as following.
• Insulation resistance of “Torque sensor 5 V reference power supply circuit” wire is infinity between its
terminal and other terminal at torque sensor
connector.
• Wiring resistance of “Torque sensor 5 V reference power supply circuit” is less than 1 Ω.
• Insulation resistance of “Torque sensor 5 V reference power supply circuit” between its circuit and vehicle
body ground is infinity.
Is circuit in good condition? Replace P/S control
module.
Repair or replace
defective circuit.
20
E52
I4RS0A630013-02

Downloaded from www.Manualslib.com manuals search engine 6C-22 Power Assisted Steering System:
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.

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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 C1153 indicated together? Go to DTC C1153 diag.
flow.
Go to Step 3.
3 Torque sensor main power supply voltage check
1) With ignition switch turned OFF, disconnect torque
sensor connector.
2) Check for P/S control module connector (“E52”) for proper connection.
3) If connections are OK, check for voltage between “E52- 8” (“GRN” wire) terminal and body ground with ignition
switch ON.
Is it approx. 12 V? Go to Step 4. Go to Step 5.
4 Torque sensor main power supply voltage check
1) With ignition switch turned OFF, connect torque sensor
connector.
2) Check for P/S control module connector (“E52”) for proper connection.
3) Turn ignition switch ON.
4) Check for voltage between “Main power supply for torque sensor circuit” terminal and body ground with
connector (“E52”) connected to the P/S control module.
Is it about 12 V? Substitute a known-
good P/S control
module and recheck.
Replace steering gear
case assembly and
recheck.
5 Torque sensor main power supply circuit check
1) With ignition switch turned OFF, disconnect P/S control
module connector.
2) Check that “Main power supply for torque sensor circuit” is as following.
• Insulation resistance of “Main power supply for torque sensor circuit” wire is infinity between its terminal and
other terminal at torque sensor connector.
• Wiring resistance of “Main power supply for torque sensor circuit” is less than 1 Ω .
• Insulation resistance of “Main power supply for torque sensor circuit” between its circuit and vehicle body
ground is infinity.
Is circuit in good condition? Replace P/S control
module.
Repair or replace
defective circuit.
8
E52
I4RS0A630021-02

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DTC Detecting Condition and Trouble Area
DTC TroubleshootingDTC detecting condition Trouble area
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 cont rol duty is more than 90%
while target motor drive current is less than 8 A.
(1 driving cycle detection logic) • P/S motor circuit
• P/S motor
• 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 C1153 and/or DTC C1155 indicated together? Go to applicable DTC
diag. flow.
Go to Step 3.
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? Go to Step 4.
Repair or replace
defective circuit.
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? Go to Step 5.
Repair or replace
defective circuit.
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? Substitute a known-
good P/S control
module, and recheck.
Replace the steering
gear case assembly.

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Reference waveform No.3
Motor output signal 1(1), Motor output signal 2(2), with
engine idling
Steering Wheel Play CheckS7RS0B6304024
• Check steering wheel for looseness or rattle by moving it in its shaft direction and lateral direction.
If found defective, repair or replace.
• Check steering wheel for play, holding vehicle in straight forward condition on the ground with engine
stopped.
If steering wheel play is not within specification,
inspect as follows and replace if found defective.
• Tie-rod end ball stud for wear (Ball stud should move when more than 0.2 N ⋅m (2 kg-cm, 0.44 lb-ft) torque is
applied.)
• Lower ball joint for wear
• Steering shaft joint for wear • Steering pinion or rack gear for wear or breakage
• Each part for looseness
Steering wheel play
“a”
: 0 – 30 mm (0 – 1.18 in.)
Steering Force CheckS7RS0B6304025
1) Place vehicle on level road and set steering wheel at
straight-ahead position.
2) Check if tire inflation pressure is as specified referring to the tire placard.
3) Remove driver air bag (inflator) module referring to “Driver Air Bag (Inflator) Module Removal and
Installation in Section 8B”.
4) Start engine.
5) With engine idling, measure steering force by turning torque wrench.
Steering force
: Less than 6.4 N ⋅m (0.64 kgf-m, 4.6 lb-ft)
6) Install driver air bag (inflator) module referring to “Driver Air Bag (Inflator) Module Removal and
Installation in Section 8B”.
Measurement
terminal
CH1: “E51-1” to vehicle body ground
CH2: “E51-2” to vehicle body ground
Oscilloscope
setting CH1: 5 V/DIV, CH2: 5 V/DIV
TIME: 20
µs/DIV
Measurement
condition • Engine is idling and steering wheel
is kept fully turned to left or right
until it stops
[A]: Steering wheel is kept fully turned left until it stops
[B]: Steering wheel is kept fully turned right until it stops
[C]: 12 V ON
[D]: GND ON
I6RS0B630019-01
I3RM0A630021-01
I3RM0A630022-01