2000 SUZUKI SWIFT air condition

ELECTRICAL POWER STEERING (P/S) SYSTEM 3B1-1
6F1
6F2
6G
6H
6K
7A
7A1
3B1
7D
7E
7F
8A
8B
8C
8D
8E
9
10
10A
10B
SECTION 3B1
ELECTRICAL POWER STEERING (P/S) SYSTEM
CONTENTS
GENERAL DESCRIPTION .............................3B1-2
SYSTEM COMPONENTS ........................... 3B1-2
WIRING DIAGRAM ..................................... 3B1-3
DIAGNOSIS ....................................................3B1-4
ON-BOARD DIAGNOSTIC SYSTEM .......... 3B1-4
PRECAUTIONS IN DIAGNOSING
TROUBLES ................................................. 3B1-4
SYSTEM CHECK FLOW TABLE ................ 3B1-5
MALFUNCTION INDICATOR LAMP
(“EPS” WARNING LAMP) CHECK.............. 3B1-7
DTC CHECK ............................................... 3B1-8
DTC CLEARANCE ...................................... 3B1-9
SERIAL DATA LINK CIRCUIT CHECK ..... 3B1-10
DTC TABLE .............................................. 3B1-11
TABLE A - MALFUNCTION INDICATOR
LAMP DOES NOT COME ON AT
IGNITION SWITCH ON BUT LEAVING
ENGINE OFF ............................................ 3B1-13
TABLE B - MALFUNCTION INDICATOR
LAMP FLASHES AT IGNITION SWITCH
ON ............................................................. 3B1-15
TABLE C - MALFUNCTION INDICATOR
LAMP DOES NOT FLASH, JUST
REMAINS ON OR JUST REMAINS OFF
EVEN WITH DIAGNOSIS SWITCH
TERMINAL GROUNDED .......................... 3B1-15
DTC C1111 (DTC No.11) TORQUE
SENSOR MAIN CIRCUIT FAILURE ......... 3B1-16
DTC C1113 (DTC No.13) TORQUE
SENSOR MAIN AND SUB CIRCUIT
FAILURE ................................................... 3B1-16DTC C1115 (DTC No.15) TORQUE
SENSOR SUB CIRCUIT FAILURE........... 3B1-16
DTC C1114 (DTC No.14) TORQUE
SENSOR 5V POWER SUPPLY CIRCUIT
FAILURE ................................................... 3B1-17
DTC C1116 (DTC No.16) TORQUE
SENSOR 8V POWER SUPPLY CIRCUIT
FAILURE ................................................... 3B1-18
DTC C1121/C1123/C1124
(DTC No.21/23/24) VSS CIRCUIT
FAILURE ................................................... 3B1-19
DTC C1122 (DTC No.22) ENGINE
SPEED SIGNAL CIRCUIT FAILURE ........ 3B1-20
DTC C1141/C1142/C1143/C1144/C1145
(DTC No.41/42/43/44/45) MOTOR
CIRCUIT FAILURE ................................... 3B1-21
DTC C1151 (DTC No.51) CLUTCH
CIRCUIT FAILURE ................................... 3B1-22
DTC C1153(DTC No.53) P/S CONTROL
MODULE POWER SUPPLY CIRCUIT
FAILURE ................................................... 3B1-24
DTC C1152/C1154/C1155
(DTC No.52/54/55) P/S CONTROL
MODULE FAILURE .................................. 3B1-24
TROUBLE DIAGNOSIS (FOR TROUBLE
NOT INDICATED BY ON BOARD
DIAGNOSTIC SYSTEM)........................... 3B1-25
INSPECTION OF P/S CONTROL
MODULE AND ITS CIRCUITS ................. 3B1-26
STEERING WHEEL PLAY
INSPECTION ............................................ 3B1-28 WARNING:
For vehicles equipped with Supplemental Restraint (Air Bag) System :
Service on and around the air bag system components or wiring must be performed only by an
authorized SUZUKI dealer. Refer to “Air Bag System Components and Wiring Location View” under
“General Description” in air bag system section in order to confirm whether you are performing ser-
vice on or near the air bag system components or wiring. Please observe all WARNINGS and “Ser-
vice Precautions” under “On-Vehicle Service” in air bag system section before performing service
on or around the air bag system components or wiring. Failure to follow WARNINGS could result in
unintentional activation of the system or could render the system inoperative. Either of these two
conditions may result in severe injury.
Technical service work must be started at least 90 seconds after the ignition switch is turned to the
“LOCK” position and the negative cable is disconnected from the battery. Otherwise, the system
may be activated by reserve energy in the Sensing and Diagnostic Module (SDM).

3B1-4 ELECTRICAL POWER STEERING (P/S) SYSTEM
DIAGNOSIS
The P/S system in this vehicle is controlled by P/S control module. P/S control module has an on-board diagnos-
tic system which detects a malfunction in this system.
When diagnosing troubles, be sure to have full understanding of the outline of “ON-BOARD DIAGNOSTIC SYS-
TEM” and each item in “PRECAUTION IN DIAGNOSING TROUBLE” and execute diagnosis according to “SYS-
TEM CHECK FLOW TABLE”.
ON-BOARD DIAGNOSTIC SYSTEM
P/S control module performs on-board diagnosis (self-diagnosis)
on the system and operates “EPS” warning lamp (1) (malfunction
indicator lamp) as follows.
Malfunction indicator lamp (“EPS” warning lamp) lights when
the ignition switch is turned to ON position (but the engine at
stop) regardless of the condition of P/S control system. This
is only to check the malfunction indicator lamp (“EPS” warn-
ing lamp) bulb and its circuit.
If the areas monitored by P/S control module is free from any
trouble after the engine start (while engine is running), mal-
function indicator lamp (“EPS” warning lamp) turns OFF.
When P/S control module detects a trouble which has
occurred in the areas it monitors, malfunction indicator lamp
(“EPS” warning lamp) turns ON while the engine is running
to warn the driver of such occurrence of trouble and at the
same time it stores the exact trouble area in memory inside
of P/S control module.
PRECAUTIONS IN DIAGNOSING TROUBLES
Take a note of DTC indicated first.
Be sure to read “PRECAUTIONS FOR ELECTRONIC CIRCUIT SERVICE” in Section 0A before inspection
and observe what is written there.
When two or more troubles have occurred, their DTCs are indicated 3 times each starting with the smallest
code number and up.
DTC C1122 (DTC No.22) (engine speed signal failure) is indicated when ignition switch is ON position and
engine is not running but if indication changes to a normal one when engine is started, it means nothing
abnormal.
As DTC is stored in memory of P/S control module, be sure to clear memory after repair by performing the
procedure described in “DTC CLEARANCE”.
1

ELECTRICAL POWER STEERING (P/S) SYSTEM 3B1-5
SYSTEM CHECK FLOW TABLE
Step Action Yes No
1 1) Record details of the problem (failure, complaint) and how it
occurred as described by the customer.
For this purpose, use of such a questionnaire from as shown
below will facilitate collecting information to the point required for
proper analysis and diagnosis.
2) Check if what the customer claimed in “CUSTOMER QUES-
TIONNAIRE” is actually found in the vehicle and if that symptom
is found, whether it is identified as a failure.
(This step should be shared with the customer if possible.)
3) Check malfunction indicator lamp (“EPS” warning lamp) opera-
tion referring to “MALFUNCTION INDICATOR LAMP (“EPS”
LIGHT) CHECK”.
4) Check DTC referring to “DTC CHECK” in this section and record
the DTC(s).
5) Clear DTC if any malfunction DTC exists referring to “DTC
CLEARANCE” in this section, then recheck DTC.
Is any malfunction DTC detected?Go to Step 2. Go to Step 3.
2 1) Inspect and repair referring to applicable “DTC TABLE” in this
section.
2) Clear DTC referring to “DTC CLEARANCE” in this section.
Does the trouble recur?Go to Step 5. Go to Step 4.
3 1) Test drive the vehicle and turn steering wheel fully to the right
and left during test driving. See WARNING. Check if any trouble
exists.
2) Inspect and repair basic parts referring to “DIAGNOSIS CHART”
in SECTION 3.
3) If the trouble cannot be repaired in Step 3-2), inspect and repair
referring to “TROUBLE DIAGNOSIS (FOR TROUBLE NOT INDI-
CATED BY ON-BOARD DIAGNOSTIC SYSTEM)” in this sec-
tion.
Does the trouble recur?Go to Step 5. Go to Step 4.
4 1) Confirm that the problem symptom has gone and P/S system is
free from any abnormal conditions. If what has been repaired is
related to the malfunction DTC, clear the DTC once and perform
test driving as in Step 3-1) and confirm that no DTC is indicated.
Is any malfunction DTC detected?Go to Step 5. END
5 1) Check DTC referring to “DTC CHECK” in this section.
Is any malfunction DTC detected?Go to Step 2. Go to Step 3.
WARNING:
Carry out test in very little traffic area to prevent an accident.

ELECTRICAL POWER STEERING (P/S) SYSTEM 3B1-7
CUSTOMER QUESTIONNAIRE (EXAMPLE)
MALFUNCTION INDICATOR LAMP
(“EPS” WARNING LAMP) CHECK
1) Turn ignition switch to ON position (but without running
engine), check that malfunction indicator lamp (“EPS” warn-
ing lamp) lights up. If lamp does not light up, go to “TABLE
A”. If lamp flashes, go to “TABLE B”.
2) Start engine and check that malfunction indictor lamp
(“CHECK ENGIE” light) turns OFF.
If lamp comes OFF, P/S system is in good condition.

ELECTRICAL POWER STEERING (P/S) SYSTEM 3B1-17
DTC C1114 (DTC No.14) TORQUE SENSOR 5V POWER SUPPLY CIRCUIT FAIL-
URE
Fig. for Step 2
1. To main fuse 4.“IG METER” fuse (15A) in fuse box 7. Connector “G24”
2. Ignition switch 5. P/S control module 8. Connector “G24-1”
3.“P/S” fuse (30A) in fuse box 6. Torque sensor
G24-1
G24-8G24-2
7
G24-1-5
G24-1-4 G24-1-3 G24-1-2 G24-1-18
G24-2 G24-1
G24-8G24-1-4G24-1-3
G24-1-5G24-1-2G24-1-1
1
23
45
6
BLK/WHT BLK/RED
BLK WHTYEL BLK BLU RED
Step Action Yes No
1Was “SYSTEM CHECK FLOW TABLE” per-
formed?Go to STEP 2. Go to “SYSTEM CHECK
FLOW TABLE”.
2 1) Remove steering column hole cover.
2) Check proper connection for 5-terminals
connector (“G24-1”) to P/S control module.
3) If OK, turn ignition switch ON.
4) Check voltage between “G24-1-2” (“BLU”
wire) terminal of 5-terminals connector
(“G24-1”) and body ground with connector
(“G24-1”) connected to P/S control module.
Is it about 5 V?Go to STEP 3. Repair high resistance,
open or short to power cir-
cuit or ground in 5V power
supply (“BLU” wire) cir-
cuit.
3 1) Check torque sensor and its circuit. Refer to
“TORQUE SENSOR”.
Is torque sensor in good condition?Substitute a known-good
P/S control module and
recheck.Replace steering column
assembly and recheck.

3B1-18 ELECTRICAL POWER STEERING (P/S) SYSTEM
DTC C1116 (DTC No.16) TORQUE SENSOR 8V POWER SUPPLY CIRCUIT FAIL-
URE
Fig. for Step 2
1. To main fuse 4.“IG METER” fuse (15A) in fuse box 7. Connector “G24”
2. Ignition switch 5. P/S control module 8. Connector “G24-1”
3.“P/S” fuse (30A) in fuse box 6. Torque sensor
G24-1
G24-8G24-2
7
G24-1-5
G24-1-4 G24-1-3 G24-1-2 G24-1-18
G24-2 G24-1
G24-8G24-1-4 G24-1-3
G24-1-5 G24-1-2 G24-1-1
1
23
45
6
BLK/WHTBLK/RED
BLK WHTYEL BLK BLU RED
Step Action Yes No
1Was “SYSTEM CHECK FLOW TABLE” per-
formed?Go to STEP 2. Go to “SYSTEM CHECK
FLOW TABLE”.
2 1) Remove steering column hole cover.
2) Check proper connection for 5-terminals
connector (“G24-1”) to P/S control module.
3) If OK, turn ignition switch ON.
4) Measure voltage between “G24-1-1” (“RED”
wire) terminal of 5-terminals connector
(“G24-1”) and body ground with connector
(“G24-1”) connected to P/S control module.
Is it about 8 V?Go to STEP 3. Repair high resistance,
open or short to power cir-
cuit or ground in 8V power
supply (“RED” wire) cir-
cuit.
3 1) Check torque sensor and its circuit. Refer to
“TORQUE SENSOR”.
Is torque sensor in good condition?Substitute a known-good
P/S control module and
recheck.Replace steering column
assembly and recheck.

3B1-20 ELECTRICAL POWER STEERING (P/S) SYSTEM
DTC C1122 (DTC No.22) ENGINE SPEED SIGNAL CIRCUIT FAILURE
1. To main fuse 4.“IG METER” fuse (15A) in fuse box 7. Connector “G24”
2. Ignition switch 5. ECM
3.“P/S” fuse (30A) in fuse box 6. P/S control module
G24-2 G24-1
G24-8
G24-6 1
23
4
56
BLK/WHT BLK/RED
BRNBLK
G24-1
G24-6
G24-8G24-2
7
Step Action Yes No
1Was “SYSTEM CHECK FLOW TABLE” per-
formed?Go to STEP 2. Go to “SYSTEM CHECK
FLOW TABLE”.
2 1) Recheck DTC with engine running.
Is DTC C1122 (DTC No.22) indicated?Go to STEP 3. It is nothing abnormal for
DTC C1122 (DTC No.22).
P/S system is in normal
condition.
3 1) Check proper connection to P/S control mod-
ule and ECM at each “BRN” wire terminal (P/
S control module side: “G24-6” terminal, ECM
side : Refer to in SECTION 6E), then check
intermittent trouble. Refer to “INTERMITTENT
TROUBLE” in SECTION 0A.
2) If they are OK, check high resistance, open or
short to power circuit or ground in “BRN” wire
circuit.
Is check result in good condition?Substitute a known-
good P/S control mod-
ule and recheck.Repair.

ELECTRICAL POWER STEERING (P/S) SYSTEM 3B1-21
DTC C1141/C1142/C1143/C1144/C1145 (DTC No.41/42/43/44/45) MOTOR CIR-
CUIT FAILURE
Fig. for Step 2
1. To main fuse 4.“IG METER” fuse (15A) in fuse box 7. Connector “G24”
2. Ignition switch 5. P/S control module 8. Connector “G24-1”
3.“P/S” fuse (30A) in fuse box 6. Motor and clutch
MG24-1
G24-8G24-2
7
G24-2-2
G24-2-4 G24-2-3 G24-2-1
8
G24-2 G24-1
G24-8G24-2-2
G24-2-1
G24-2-4
G24-2-3 1
23
46 5
BLK/WHTBLK/RED
BLKBLK BLK RED or BLK BLK or RED
Step Action Yes No
1Was “SYSTEM CHECK FLOW TABLE” per-
formed?Go to STEP 2. Go to “SYSTEM CHECK
FLOW TABLE”.
2 1) Remove steering column hole cover.
2) Check proper connection for 4-terminals con-
nector (“G24-2”) to P/S control module.
3) If OK, start engine.
4) Check voltage between “G24-2-2” (“BLK” wire
or “RED wire) terminal and body ground and
“G24-2-1” (“RED” wire or “BLK” wire) terminal
and body ground with connector (“G24-2”)
connected to P/S control module.
Are they 5 – 7 V with steering wheel held at posi-
tion for vehicle to run straight?Go to STEP 3. Repair poor connection,
high resistance, open or
short to power circuit or
ground in “G24-2” (“BLK”
wire or “RED” wire) or
“G24-2-1” (“RED” wire or
“BLK” wire) circuit.
3 1) Check motor and its circuit. Refer to “MOTOR
AND CLUTCH”.
Is motor and clutch in good condition?Substitute a known-
good P/S control module
and recheck.Replace steering column
assembly and recheck.