Ecm SUZUKI SWIFT 2000 1.G RG413 Service User Guide

ELECTRICAL POWER STEERING (P/S) SYSTEM 3B1-3
WIRING DIAGRAM
BLK RED
BLK
BLK
BLU
BLK YEL BLU
BLK
YEL
WHT
BRN
PPLBLK/WHT
BLK/RED
PPL/WHTBLK or RED
RED or BLK G24-1-1 G24-2-2
G24-2-1
G24-2-4
G24-2-3
G24-5
G24-3
G24-4
G24-2 G24-1-2
G24-1-3
G24-1-4
G24-1-5
G24-6
G24-8
G24-1 G24-7 12
5
6
124
378
9171611 10
G24-1
G24-3
G24-4
G24-5
G24-6
G24-7G24-8G24-2
13
G24-2-2
G24-2-4 G24-2-3 G24-2-1
14
G24-1-5
G24-1-4 G24-1-3 G24-1-2 G24-1-115
1. Main fuse 7. Monitor coupler (for A/T, ABS, P/S system) 13. Connector “G24”
2. Ignition switch 8. Diagnosis switch terminal (for P/S system) 14. Connector “G24-2”
3.“P/S” fuse (30A) in fuse box 9. Ground terminal 15. Connector “G24-1”
4.“IG METER” fuse (15A) in fuse box 10. P/S control module 16.“EPS” warning lamp
5. ECM 11. Motor and clutch 17. DLC
6. VSS 12. Torque sensor

3B1-10 ELECTRICAL POWER STEERING (P/S) SYSTEM
SERIAL DATA LINK CIRCUIT CHECK
DIAGNOSTIC FLOW TABLE
CAUTION:
Be sure to perform “SYSTEM CHECK FLOW TABLE” before starting diagnosis according to flow table.
1. Main fuse box 6. Combination meter 11. Data link connector (DLC)
2.“EPS” fuse (30 A) 7. Speedometer 12. To ECM, SDM and ABS hydraulic unit/control module
assembly (if equipped)
3. Ignition switch 8.“EPS” warning lamp 13. P/S control module
4. Circuit fuse box 9. To vehicle speed sensor (VSS) 14. Connector “G24”
5.“IG coil” fuse (15 A) 10. To main fuse box
Step Action Yes No
1Was “SYSTEM CHECK FLOW TABLE” per-
formed?Go to Step 2. Go to “SYSTEM CHECK
FLOW TABLE” in this sec-
tion.
2 1) Make sure that SUZUKI scan tool free from
malfunction and correct cartridge for P/S
system is used.
2) Turn ignition switch to OFF position.
3) Check proper connection of SUZUKI scan
tool to DLC.
Is connection in good condition?Go to Step 3. Properly connect SUZUKI
scan tool to DLC.

ELECTRICAL POWER STEERING (P/S) SYSTEM 3B1-11
Fig. for Step 4
DTC TABLE
3 1) Check if communication is possible by trying
communication with other controller
(ECM, ABS hydraulic unit/control module
assembly (if equipped) or SDM).
Is it possible to communicate with other control-
ler?Go to Step 4. Repair open in common
section of serial data cir-
cuit (“BLU” wire circuit)
used by all controllers or
short to ground or power
circuit which has occurred
somewhere in serial data
circuit (“BLU” wire circuit).
4 1) With ignition switch is OFF position, discon-
nect 8-pin (“G24”) connector from P/S con-
trol module.
2) Check proper connection at “G24-3” (“BLU”
wire) terminal for serial data circuit.
3) If OK, then check resistance between “G24-
3” (“BLU” wire) terminal and “BLU” wire ter-
minal for serial data circuit in DLC.
Is resistance 1 Ω or less?Substitute a known-good
P/S control module and
recheck.Repair high resistance or
open in “BLU” wire circuit
for P/S system. Step Action Yes No
1. DLC
2.“BLU” wire terminal
CAUTION:
Be sure to perform “SYSTEM CHECK FLOW TABLE” before starting diagnosis according to flow table
of each DTC.
21
3.0
0.3
0.30.3 0.31.0 3.03.0 21 21
Example : When VSS circuit fail (DTC 1121, DTC No.21) is set
“EPS” lightTurn ON
Turn OFF
TIME
(sec.)

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.

5E-4 ANTILOCK BRAKE SYSTEM (ABS)
SYSTEM SCHEMATIC
1. ABS hydraulic unit/control module assembly 7.“ABS” warning lamp 13. Wheel speed sensor (Right-front)
2. ABS control module 8.“EBD” warning lamp (Brake warning lamp) 14. Wheel speed sensor (Left-front)
3. ABS hydraulic unit 9. Lamp driver module 15. Wheel speed sensor (Right-rear)
4. Fail safe relay 10. ECM 16. Wheel speed sensor (Left-rear)
5. Pump motor relay 11. Data link connector 17. G sensor (For 4WD vehicle only)
6. Stop lamp switch 12. Monitor coupler
INPUT OUTPUT
ABS control
module Wheel speed sensor (LF)
Wheel speed sensor (LR)
Wheel speed sensor (RF)
Wheel speed sensor (RR)
Stop lamp switch
Diag. switch terminal
Battery Voltage
G sensor (for 4WD vehicle only)
Pump motor
relay
Fail-safe
relay
Hydraulic unit
Pump motor
LF inlet solenoid
LF outlet solenoid
LR inlet solenoid
LR outlet solenoid
RF inlet solenoid
RF outlet solenoid
RR inlet solenoid
RR outlet solenoid
“ABS” warning lamp
ECM
EBD warning lamp
(Brake warning lamp)
Data link connector
ABS hydraulic unit/control
module assembly

ANTILOCK BRAKE SYSTEM (ABS) 5E-7
1. Battery 9. ABS hydraulic unit/control module assembly 17. Left-rear wheel speed sensor
2. Main fuses 10. Terminal arrangement of connector E19 for ABS
hydraulic unit/control module assembly18. Right-front wheel speed sensor
3. Ignition switch 11. ABS fail-safe relay (Solenoid valve relay) 19. Left-front wheel speed sensor
4. Circuit fuses 12. ABS pump motor relay 20. Data link connector
5. Combination meter 13. Pump motor 21. To ECM, SDM and EPS controller (if equipped)
6. ABS warning lamp 14. Solenoid valves 22. Stop lamp
7. Brake warning lamp (“EBD” warning lamp) 15. Diagnosis monitor coupler 23. Stop lamp switch
8. Warning lamp driver module (for ABS) 16. Right-rear wheel speed sensor 24. G sensor (For 4WD vehicle only)
Wire color
BLK : Black LT GRN/BLK : Light Green/Black RED/BLU : Red/Blue
BLK/ORN : Black/Orange LT GRN/RED : Light Green/Red WHT : White
BLK/YEL : Black/Yellow ORN : Orange WHT/BLK : White/Black
BLU : Blue PNK : Pink WHT/BLU : White/Blue
BRN : Brown PNK/BLU Pink/Blue WHT/RED : White/Red
GRN : Green RED : Red YEL : Yellow
GRN/ORN : Green/Orange RED/BLK : Red/Black
TERMINAL CIRCUIT
E191–
2 Stop lamp switch
3 Right-front wheel speed sensor (+)
4 Right-front wheel speed sensor (–)
5–
6 Right-rear wheel speed sensor (–)
7 Right-rear wheel speed sensor (+)
8–
9–
10 Brake warning lamp (EBD warning lamp)
11 G sensor (For 4WD vehicle only)
12 Diagnosis switch terminal
13 Ground (For G sensor) (For 4WD vehicle only)
14 ABS warning lamp
15 Left-front wheel speed sensor (+)
16 Left-front wheel speed sensor (–)
17–
18 Ignition switch
19 Left-rear wheel speed sensor (+)
20 Left-rear wheel speed sensor (–)
21 Data link connector
22 Ground (for ABS pump motor)
23 ABS pump motor relay
24 Ground (for ABS control module)
25 ABS fail-safe relay

6-2 ENGINE GENERAL INFORMATION AND DIAGNOSIS
ENGINE DIAGNOSIS ......................................... 6-6
GENERAL DESCRIPTION ............................. 6-6
ON-BOARD DIAGNOSTIC SYSTEM
(VEHICLE WITH IMMOBILIZER INDICATOR
LAMP) ............................................................. 6-7
ON-BOARD DIAGNOSTIC SYSTEM
(VEHICLE WITHOUT IMMOBILIZER
INDICATOR LAMP) ...................................... 6-10
PRECAUTION IN DIAGNOSING
TROUBLE ..................................................... 6-11
ENGINE DIAGNOSTIC FLOW TABLE ......... 6-12
CUSTOMER PROBLEM INSPECTION
FORM (EXAMPLE) ................................... 6-14
MALFUNCTION INDICATOR LAMP (MIL)
CHECK...................................................... 6-15
DIAGNOSTIC TROUBLE CODE (DTC)
CHECK...................................................... 6-15
DIAGNOSTIC TROUBLE CODE (DTC)
CLEARANCE ............................................ 6-16
DIAGNOSTIC TROUBLE CODE (DTC)
TABLE ....................................................... 6-17
FAIL-SAFE TABLE.................................... 6-20
VISUAL INSPECTION .............................. 6-22
ENGINE BASIC INSPECTION.................. 6-23
ENGINE DIAGNOSIS TABLE ................... 6-26
SCAN TOOL DATA....................................... 6-31
INSPECTION OF ECM AND ITS
CIRCUITS ..................................................... 6-36
ECM VOLTAGE VALUES TABLE............. 6-37
TERMINAL RESISTANCE TABLE............ 6-43
COMPONENT LOCATION ........................... 6-45
TABLE A-1 MALFUNCTION INDICATOR
LAMP CIRCUIT CHECK - LAMP DOES NOT
COME “ON” AT IGNITION SWITCH ON
(BUT ENGINE AT STOP) ............................. 6-46
TABLE A-2 MALFUNCTION INDICATOR
LAMP CIRCUIT CHECK - LAMP REMAINS
“ON” AFTER ENGINE STARTS ................... 6-47
TABLE A-3 MIL CHECK - MIL FLASHES
AT IGNITION SWITCH ON (VEHICLE
WITHOUT IMMOBILIZER INDICATOR
LAMP) ........................................................... 6-48
TABLE A-4 MIL CHECK - MIL DOES NOT
FLASH OR JUST REMAINS ON EVEN
WITH GROUNDING DIAGNOSIS SWITCH
TERMINAL (VEHICLE WITHOUT
IMMOBILIZER INDICATOR LAMP) .............. 6-48
TABLE A-5 ECM POWER AND GROUND
CIRCUIT CHECK - MIL DOESN’T LIGHT
AT IGNITION SWITCH ON AND ENGINE
DOESN’T START THOUGH IT IS
CRANKED UP .............................................. 6-49
DTC P0105 (DTC NO.11) MANIFOLD
ABSOLUTE PRESSURE (MAP) CIRCUIT
MALFUNCTION ............................................ 6-52
DTC P0110 (DTC NO.18) INTAKE AIR
TEMP. (IAT) CIRCUIT MALFUNCTION ....... 6-55
DTC P0115 (DTC NO.19) ENGINE
COOLANT TEMPERATURE (ECT) CIRCUIT
MALFUNCTION ............................................ 6-57DTC P0120 (DTC NO.13) THROTTLE
POSITION CIRCUIT MALFUNCTION ........... 6-60
DTC P0121 THROTTLE POSITION CIRCUIT
RANGE/PERFORMANCE PROBLEM .......... 6-63
DTC P0130 (DTC NO.14) HEATED OXYGEN
SENSOR (HO2S) CIRCUIT MALFUNCTION
(SENSOR-1) .................................................. 6-66
DTC P0133 HEATED OXYGEN SENSOR
(HO2S) CIRCUIT SLOW RESPONSE
(SENSOR-1) .................................................. 6-68
DTC P0134 HEATED OXYGEN SENSOR
(HO2S) CIRCUIT NO ACTIVITY DETECTED
(SENSOR-1) .................................................. 6-69
DTC P0135 (DTC NO.14) HEATED OXYGEN
SENSOR (HO2S) HEATER CIRCUIT
MALFUNCTION (SENSOR-1) ....................... 6-70
DTC P0136 HEATED OXYGEN SENSOR
(HO2S) CIRCUIT MALFUNCTION
(SENSOR-2) .................................................. 6-72
DTC P0141 HEATED OXYGEN SENSOR
(HO2S) HEATER CIRCUIT MALFUNCTION
(SENSOR-2) .................................................. 6-74
DTC P0171 FUEL SYSTEM TOO LEAN ....... 6-76
DTC P0172 FUEL SYSTEM TOO RICH ....... 6-76
DTC P0300 RANDOM MISFIRE DETECTED
(MISFIRE DETECTED AT 2 OR MORE
CYLINDERS) ................................................. 6-81
DTC P0301 CYLINDER 1 MISFIRE
DETECTED ................................................... 6-81
DTC P0302 CYLINDER 2 MISFIRE
DETECTED ................................................... 6-81
DTC P0303 CYLINDER 3 MISFIRE
DETECTED ................................................... 6-81
DTC P0304 CYLINDER 4 MISFIRE
DETECTED ................................................... 6-81
DTC P0325 (DTC NO.17) KNOCK SENSOR
CIRCUIT MALFUNCTION ............................. 6-86
DTC P0335 (DTC NO.23) CRANKSHAFT
POSITION (CKP) SENSOR CIRCUIT
MALFUNCTION ............................................. 6-88
DTC P0340 (DTC NO.15) CAMSHAFT
POSITION (CMP) SENSOR CIRCUIT
MALFUNCTION ............................................. 6-91
DTC P0400 EXHAUST GAS
RECIRCULATION FLOW MALFUNCTION ... 6-94
DTC P0420 CATALYST SYSTEM
EFFICIENCY BELOW THRESHOLD ............ 6-97
DTC P0443 PURGE CONTROL VALVE
CIRCUIT MALFUNCTION ........................... 6-100
DTC P0480 RADIATOR COOLING FAN
CONTROL SYSTEM MALFUNCTION ........ 6-101
DTC P0500 (DTC NO.16) VEHICLE SPEED
SENSOR (VSS) MALFUNCTION ................ 6-103
DTC P0505 (DTC NO.26) IDLE CONTROL
SYSTEM MALFUNCTION ........................... 6-105
DTC P1450 BAROMETRIC PRESSURE
SENSOR LOW/HIGH INPUT....................... 6-108
DTC P1451 BAROMETRIC PRESSURE
SENSOR PERFORMANCE PROBLEM ...... 6-108

ENGINE GENERAL INFORMATION AND DIAGNOSIS 6-3
DTC P1500 ENGINE STARTER SIGNAL
CIRCUIT MALFUNCTION ........................... 6-110
DTC P1510 ECM BACK-UP POWER
SUPPLY MALFUNCTION ........................... 6-111
DTC P1600 SERIAL COMMUNICATION
PROBLEM BETWEEN ECM AND TCM...... 6-112
DTC P1717 A/T DRIVE RANGE (PARK/
NEUTRAL POSITION) SIGNAL CIRCUIT
MALFUNCTION .......................................... 6-114
TABLE B-1 FUEL INJECTOR CIRCUIT
CHECK ........................................................ 6-117
TABLE B-2 FUEL PUMP AND ITS CIRCUIT CHECK ....................................................... 6-118
TABLE B-3 FUEL PRESSURE CHECK ..... 6-120
TABLE B-4 IDLE AIR CONTROL
SYSTEM CHECK........................................ 6-122
TABLE B-5 A/C SIGNAL CIRCUITS
CHECK (VEHICLE WITH A/C) ................... 6-124
TABLE B-6 ELECTRIC LOAD SIGNAL
CIRCUIT CHECK ........................................ 6-126
TABLE B-7 RADIATOR FAN CONTROL
SYSTEM CHECK........................................ 6-128
SPECIAL TOOL ............................................. 6-130

6-6 ENGINE GENERAL INFORMATION AND DIAGNOSIS
FUEL PRESSURE RELIEF PROCEDURE
After making sure that engine is cold, release fuel pressure as fol-
lows.
1) Place transmission gear shift lever in “Neutral” (Shift selector
lever to “P” range for A/T model), set parking brake, and
block drive wheels.
2) Remove relay box cover.
3) Disconnect fuel pump relay (1) from relay box.
4) Remove fuel filler cap to release fuel vapor pressure in fuel
tank and then reinstall it.
5) Start engine and run it till it stops for lack of fuel. Repeat
cranking engine 2-3 times for about 3 seconds each time to
dissipate fuel pressure in lines. Fuel connections are now
safe for servicing.
6) Upon completion of servicing, connect fuel pump relay (1) to
relay box and install relay box cover.
FUEL LEAKAGE CHECK PROCEDURE
After performing any service on fuel system, check to make sure
that there are no fuel leakages as follows.
1) Turn ON ignition switch for 3 seconds (to operate fuel pump)
and then turn it OFF.
Repeat this (ON and OFF) 3 or 4 times and apply fuel pres-
sure to fuel line. (till fuel pressure is felt by hand placed on
fuel feed hose.)
2) In this state, check to see that there are no fuel leakages
from any part of fuel system.
ENGINE DIAGNOSIS
GENERAL DESCRIPTION
This vehicle is equipped with an engine and emission control system which are under control of ECM.
The engine and emission control system in this vehicle are controlled by ECM. ECM has an On-Board Diagnos-
tic system which detects a malfunction in this system and abnormality of those parts that influence the engine
exhaust emission. When diagnosing engine troubles, be sure to have full understanding of the outline of “On-
Board Diagnostic System” and each item in “Precaution in Diagnosing Trouble” and execute diagnosis accord-
ing to “ENGINE DIAGNOSTIC FLOW TABLE”.
There is a close relationship between the engine mechanical, engine cooling system, ignition system, exhaust
system, etc. and the engine and emission control system in their structure and operation. In case of an engine
trouble, even when the malfunction indicator lamp (MIL) doesn’t turn ON, it should be diagnosed according to
this flow table.CAUTION:
This work must not be done when engine is hot. If done
so, it may cause adverse effect to catalyst.
1

ENGINE GENERAL INFORMATION AND DIAGNOSIS 6-7
ON-BOARD DIAGNOSTIC SYSTEM (VEHICLE
WITH IMMOBILIZER INDICATOR LAMP)
ECM in this vehicle has following functions.
When the ignition switch is turned ON with the engine at a
stop, malfunction indicator lamp (MIL) (1) turns ON to check
the bulb of the malfunction indicator lamp (1).
When ECM detects a malfunction which gives an adverse
effect to vehicle emission while the engine is running, it
makes the malfunction indicator lamp (1) in the meter cluster
of the instrument panel turn ON or flash (flashing only when
detecting a misfire which can cause damage to the catalyst)
and stores the malfunction area in its memory.
(If it detects that continuously 3 driving cycles are normal
after detecting a malfunction, however, it makes MIL (1) turn
OFF although DTC stored in its memory will remain.)
As a condition for detecting a malfunction in some areas in
the system being monitored by ECM and turning ON the
malfunction indicator lamp (1) due to that malfunction, 2 driv-
ing cycle detection logic is adopted to prevent erroneous
detection.
When a malfunction is detected, engine and driving condi-
tions then are stored in ECM memory as freeze frame data.
(For the details, refer to description on Freeze frame data.)
It is possible to communicate by using not only SUZUKI scan
tool (Tech-1) (2) but also generic scan tool. (Diagnostic infor-
mation can be accessed by using a scan tool.)
WARM-UP CYCLE
A warm-up cycle means sufficient vehicle operation such that the
coolant temperature has risen by at least 22°C (40°F) from
engine starting and reaches a minimum temperature of 70°C
(160°F).
DRIVING CYCLE
A “Driving Cycle” consists of engine startup, driving mode where
a malfunction would be detected if present, and engine shutoff.
2 DRIVING CYCLES DETECTION LOGIC
The malfunction detected in the first driving cycle is stored in
ECM memory (in the form of pending DTC and freeze frame data)
but the malfunction indicator lamp does not light at this time. It
lights up at the second detection of same malfunction also in the
next driving cycle.
PENDING DTC
Pending DTC means a DTC detected and stored temporarily at
the first driving cycle of the DTC which is detected in the 2 driving
cycle detection logic.
3. Immobilizer indicator lamp
ODO TRIP AB
3 1
2