Circuits SUZUKI SWIFT 2000 1.G SF310 Service Workshop Manual

1. Check for loose connection
Sensor
ECM
0A-12 GENERAL INFORMATION

When checking connection of terminals, check its male half
for bend and female half for excessive opening and both for
locking (looseness), corrosion, dust, etc.

Before measuring voltage to check for electrical system,
check to make sure that battery voltage is 11 V or higher.
Such terminal voltage check at low battery voltage will lead
to erroneous diagnosis.
ELECTRICAL CIRCUIT INSPECTION
PROCEDURE
While there are various electrical circuit inspection methods, de-
scribed here is a general method to check its open and short circuit
by using an ohmmeter and a voltmeter.
OPEN CIRCUIT CHECK
Possible causes for the open circuit are as follows. As the cause is
in the connector or terminal in many cases, they need to be checked
particularly carefully.

Loose connection of connector.

Poor contact of terminal (due to dirt, corrosion or rust on it, poor
contact tension, entry of foreign object etc.).

Wire harness being open.
When checking system circuits including an electronic control unit
such as ECM, TCM, ABS control module, etc., it is important to per-
form careful check, starting with items which are easier to check.
1) Disconnect negative cable from battery.
2) Check each connector at both ends of the circuit being checked
for loose connection. Also check lock condition of connector if
equipped with connector lock.

1. Check contact tension by inserting and removing just once
2. Check each terminal for bend and proper alignment
GENERAL INFORMATION 0A-15
INTERMITTENT AND POOR CONNECTION
Most intermittent are caused by faulty electrical connections or wir-
ing, although a sticking relay or solenoid can occasionally be at
fault. When checking it for proper connection, perform careful
check of suspect circuits for:

Poor mating of connector halves, or terminals not fully seated in
the connector body (backed out).

Dirt or corrosion on the terminals. The terminals must be clean
and free of any foreign material which could impede proper termi-
nal contact. However, cleaning the terminal with a sand paper or
the like is prohibited.

Damaged connector body, exposing the terminals to moisture
and dirt, as well as not maintaining proper terminal orientation
with the component or mating connector.

Improperly formed or damaged terminals.
Check each connector terminal in problem circuits carefully to en-
sure good contact tension by using the corresponding mating ter-
minal.
If contact tension is not enough, reform it to increase contact ten-
sion or replace.

Poor terminal-to-wire connection.
Check each wire harness in problem circuits for poor connection
by shaking it by hand lightly. If any abnormal condition is found,
repair or replace.

Wire insulation which is rubbed through, causing an intermittent
short as the bare area touches other wiring or parts of the vehicle.

Wiring broken inside the insulation. This condition could cause
continuity check to show a good circuit, but if only 1 or 2 strands
of a multi-strand-type wire are intact, resistance could be far too
high.
If any abnormality is found, repair or replace.

Diagnostic Trouble Code Clearance 6-14. . . . .
Diagnostic Trouble Code Table 6-15. . . . . . . . .
Fail-safe Table 6-18. . . . . . . . . . . . . . . . . . . . . . .
Visual Inspection 6-19. . . . . . . . . . . . . . . . . . . . .
Engine Basic Inspection 6-20. . . . . . . . . . . . . . .
Engine Diagnosis Table 6-22. . . . . . . . . . . . . . .
Scan Tool Data 6-29. . . . . . . . . . . . . . . . . . . . . . .
Scan Tool Data Definitions 6-31. . . . . . . . . . . . .
Inspection of ECM (PCM) and Its Circuits 6-33
Voltage Check 6-33. . . . . . . . . . . . . . . . . . . . .
Resistance Check 6-37. . . . . . . . . . . . . . . . . .
Component Location 6-38. . . . . . . . . . . . . . . . . .
Table A-1 MIL Circuit Check
(Lamp does not come on) 6-39. . . . . . . . . . . .
Table A-2 MIL Circuit Check
(Lamp remains ON) 6-40. . . . . . . . . . . . . . . . . .
Table A-3 ECM (PCM) Power and Ground
Circuit Check 6-42. . . . . . . . . . . . . . . . . . . . . . .
DTC P0105 MAP Circuit Malfunction 6-44. . . .
DTC P0110 IAT Circuit Malfunction 6-46. . . . .
DTC P0115 ECT Circuit Malfunction 6-48. . . .
DTC P0120 Throttle Position Circuit
Malfunction 6-50. . . . . . . . . . . . . . . . . . . . . . . . .
DTC P0121 Throttle Position Circuit
Range / Performance Problem 6-52. . . . . . . . .
DTC P0130 HO2S Circuit Malfunction
(Sensor-1) 6-54. . . . . . . . . . . . . . . . . . . . . . . . . .
DTC P0133 HO2S Circuit Slow
Response (Sensor-1) 6-56. . . . . . . . . . . . . . . .
DTC P0135 HO2S Heater Circuit
Malfunction (Sensor-1) 6-57. . . . . . . . . . . . . . .
DTC P0136 HO2S Circuit Malfunction
(Sensor-2) 6-59. . . . . . . . . . . . . . . . . . . . . . . . . .
DTC P0141 HO2S Heater Circuit
Malfunction (Sensor-2) 6-62. . . . . . . . . . . . . . .
DTC P0171 Fuel System Too Lean 6-64. . . . .
DTC P0172 Fuel System Too Rich 6-64. . . . . .
DTC P0300 Random Misfire Detected 6-68. . .
DTC P0301 Cylinder 1 Misfire Detected 6-68. DTC P0302 Cylinder 2 Misfire Detected 6- 68.
DTC P0303 Cylinder 3 Misfire Detected 6- 68.
DTC P0335 CKP Sensor Circuit
Malfunction 6- 72. . . . . . . . . . . . . . . . . . . . . . . . .
DTC P0340 CMP Sensor Circuit
Malfunction 6- 74. . . . . . . . . . . . . . . . . . . . . . . . .
DTC P0420 Catalyst System Efficiency
Below Threshold 6- 76. . . . . . . . . . . . . . . . . . . .
DTC P0443 Purge Control Valve Circuit
Malfunction 6- 79. . . . . . . . . . . . . . . . . . . . . . . . .
DTC P0480 Radiator Fan Control
System Malfunction 6- 80. . . . . . . . . . . . . . . . . .
DTC P0500 Vehicle Speed Sensor
Malfunction (M / T) 6- 82. . . . . . . . . . . . . . . . . . .
DTC P0500 Vehicle Speed Sensor
Malfunction (A / T) 6- 84. . . . . . . . . . . . . . . . . . .
DTC P0505 Idle Control System
Malfunction 6- 86. . . . . . . . . . . . . . . . . . . . . . . . .
DTC P0510 Closed Throttle Position
Switch Malfunction 6- 88. . . . . . . . . . . . . . . . . .
DTC P0601 Internal Control Module
Memory Check Sum Error 6- 89. . . . . . . . . . . .
DTC P1250 EFE Heater Circuit
Malfunction 6- 90. . . . . . . . . . . . . . . . . . . . . . . . .
DTC P1450 Barometric Pressure
Sensor Low / High Input 6- 92. . . . . . . . . . . . . .
DTC P1451 Barometric Pressure Sensor
Performance Problem 6- 92. . . . . . . . . . . . . . . .
DTC P1500 Engine Starter Signal
Circuit Malfunction 6- 93. . . . . . . . . . . . . . . . . . .
DTC P1510 ECM (PCM) Back-up Power
Supply Malfunction 6- 94. . . . . . . . . . . . . . . . . .
Table B-1 Fuel Injector Circuit Check 6- 96. . . .
Table B-2 Fuel Pump and Its Circuit
Check 6- 98. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table B-3 Fuel Pressure Check 6-100. . . . . . . . .
Table B-4 A / C Signal Circuits Check 6-102. . . .
Table B-5 Power Steering Pressure
Switch Signal Circuit Check 6-103. . . . . . . . . . .
SPECIAL TOOL6-104 . . . . . . . . . . . . . . . . . . . . . . .
6-2 ENGINE GENERAL INFORMATION AND DIAGNOSIS (TBI FOR G10)

ENGINE GENERAL INFORMATION AND DIAGNOSIS (TBI FOR G10) 6-9
PRECAUTION IN DIAGNOSING TROUBLE

Don’t disconnect couplers from ECM (PCM), battery cable from
battery, ECM (PCM) ground wire harness from engine or main
fuse before confirming diagnostic information (DTC, freeze frame
data, etc.) stored in ECM (PCM) memory. Such disconnection will
erase memorized information in ECM (PCM) memory.

Diagnostic information stored in ECM (PCM) memory can be
cleared as well as checked by using SUZUKI scan tool (Tech-1)
or generic scan tool. Before using scan tool, read its Operator’s
(Instruction) Manual carefully to have good understanding as to
what functions are available and how to use it.

Priorities for diagnosing troubles.
If two or more DTCs are stored, proceed to the flow table of the
DTC which has detected earliest in the order and follow the
instruction in that table.
If no instructions are given, troubleshoot diagnostic trouble codes
according to the following priorities.
1. Diagnostic trouble codes (DTCs) other than DTC P0171 /
P0172 (Fuel system too lean / too rich) and DTC P0300 /
P0301 / P0302 / P0303 (Misfire detected)
2. DTC P0171 / P0172 (Fuel system too lean / too rich)
3. DTC P0300 / P0301 / P0302 / P0303 (Misfire detected)

Be sure to read “Precautions for Electrical Circuit Service” in Sec-
tion 0A before inspection and observe what is written there.

ECM (PCM) Replacement
When substituting a known-good ECM (PCM), check for following
conditions. Neglecting this check may cause damage to a known-
good ECM (PCM).
–Resistance value of all relays, actuators is as specified respec-
tively.
–MAP sensor and TP sensor are in good condition and none of
power circuits of these sensors is shorted to ground.

6-34 ENGINE GENERAL INFORMATION AND DIAGNOSIS (TBI FOR G10)
1. ECM (PCM)
2. ECM (PCM) couplers
(Viewed from harness side)
1. ECM (PCM)
2. Couplers
3. Body ground
4. Service wire
16
C03 C02 C01
1
2
1 2 3
4 5 6
7 8 9 10 11 1 2
3 4 5 6 7 8 1 2
3 4 5 6 7 8 9 10 11 12 13
12
13 14 15
16 17 18 19
20 21 22 9 10
11 12 13 14 15 14 15
16 17 18 19 20 21 22 23 24
25 26
INSPECTION OF ECM (PCM) AND ITS
CIRCUITS
ECM (PCM) and its circuits can be checked at ECM (PCM) wiring
couplers by measuring voltage and resistance.
CAUTION:
ECM (PCM) cannot be checked by itself. It is strictly prohib-
ited to connect voltmeter or ohmmeter to ECM (PCM) with
coupler disconnected from it.
Voltage Check
1) Remove ECM (PCM) (1) from body referring to Section 6E.
2) Check voltage at each terminal of couplers (2) connected.
NOTE:
As each terminal voltage is affected by the battery voltage,
confirm that it is 11 V or more when ignition switch is ON.

ENGINE GENERAL INFORMATION AND DIAGNOSIS (TBI FOR G10) 6-35
CONNECTOR “C02”
TER-
MINALWIRE
COLORCIRCUITSTANDARD
VOLTAGECONDITION
1BECM (PCM) ground––
2W/BlPower source10 – 14 VIgnition switch ON
3—Blank——
4—Blank——
5—Blank——
6—Blank——
7R/GEVAP canister purge valve10 – 14 VIgnition switch ON
8G/OrShift solenoid B (A / T)
0 VIgnition switch ON, selector lever at “P”
range
8G/OrShift solenoid-B (A / T)
10 – 14 VIgnition switch ON, selector lever at “D”
range
9G/WShift solenoid A (A / T)
0 VIgnition switch ON, selector lever at “P”
range
9G/WShift solenoid-A (A / T)
10 – 14 VIgnition switch ON, selector lever at “D”
range
10OrIgniter (IGT)——
11Gr / YISC actuator——
12Y/BFuel injector10 – 14 VIgnition switch ON
13B/BlGround for injector——
14WPower source for back-up10 – 14 VIgnition switch ON and OFF
15W/BlPower source10 – 14 VIgnition switch ON
16Gr / BISC actuator relay0.3 – 1.0 VIgnition switch ON
17V/YMalfunction indicator lamp0.2 – 2.0 VIgnition switch ON17V/YMalfunction indicator lamp10 – 14 VWhen engine running
18V/GImmobilizer indicator lamp0.2 – 2.0 VIgnition switch ON18V/GImmobilizer indicator lamp10 – 14 VWhen engine running at idle
19Lg / BHeater of H02S-210 – 14 VIgnition switch ON
20BlRadiator fan control relay
10 – 14 VIgnition switch ON, Engine coolant
temp: Below 91.5C (197F)
20BlRadiator fan control relay
0.3 – 1.0 VIgnition switch ON, Engine coolant
temp: 96.0C (205F) or higher
21P/WFuelpumprelay0.3 – 1.3 VFor 2 seconds after ignition switch ON21P/WFuel pump relay10 – 14 VAfter the above time
22Bl / BMain relay0.4 – 1.5 VIgnition switch ON
23–Blank——
24Gr / RISC actuator——
25Y/REFE heater relay10 – 14 VIgnition switch ON
26B/RGround for injector——

6-36 ENGINE GENERAL INFORMATION AND DIAGNOSIS (TBI FOR G10)
CONNECTOR “C01”
TER-
MINALWIRE
COLORCIRCUITSTANDARD
VOLTAGECONDITION
1LgPower source for sensor4.75 – 5.25 VIgnition switch ON
2OrCamshaft position sensor (+)——
3W/BCrankshaft position sensor
(+)——
4Gr / GClosed throttle position switch
0 – 1 V
Ignition switch ON, ISC actuator
plunger is in contact with throttle lever
screw
4Gr / G(In ISC actuator)
4 – 6 V
Ignition switch ON
Plunger is apart from throttle lever
screw
5Lg / RManifold absolute pressure
sensor3.3 – 4.0 V
Ignition switch ON
Barometric pressure: 100 kPa,
760 mmHg
6Lg / WThrottle position sensor
0.2 – 1.0 V
Ignition switch ON, when clearance
between throttle lever and throttle stop
screw is less than 0.35 mm (0.014 in.)
2.8 – 4.8 VIgnition switch ON
Throttle valve at full open position
7Gr / WEngine coolant temp. sensor0.55 – 0.95 VIgnition switch ON
Engine coolant temp.: 80C (176F)
8P/BHeater of H02S-110 – 14 VIgnition switch ON
9GGround for sensors——
10WCamshaft position sensor (–)——
11W/RCrankshaft position sensor
(+)——
12W/BEFE heater monitor0 – 1 VHeater relay OFF12W/BEFE heater monitor10 – 14 VHeater relay ON
13RHeated oxygen sensor-1Refer to DTC flow chart
14GrIntake air temp. sensor2.0 – 2.7 V
Ignition switch ON
Sensor ambient temp.
(Intake air temp): 20C (68F)
10 – 14 VIgnition switch ON
15Bl / WPower steering pressure
switch (If equipped)
0 – 1 V
With engine running at idle speed,
turning steering wheel to the right or left
as far as it stops, repeating it a few
times
16B/YEngine start switch6 – 12 VWhile engine cranking16B/Yg
(Engine start signal)0 – 1 VOther than above

ENGINE GENERAL INFORMATION AND DIAGNOSIS (TBI FOR G10) 6-37
CONNECTOR “C03”
TER-
MINALWIRE
COLORCIRCUITSTANDARD
VOLTAGECONDITION
1V/WData link connector
(SUZUKI serial data line)4 – 6 VIgnition switch ON
BlVehicle speed sensor (+) (A / T)0.4 – 0.8 VIgnition switch ON
2Y/GVehicle speed sensor (M / T)
Indicator
deflection
repeated
0 V and
4 – 6 V
Ignition switch ON
Front left tire turned slowly with front
right tire locked
3GTransmis-
sion range
“2” rangeIgnition switch ON, Selector lever at “2”
range
4Or / Y
sion range
sensor
(switch)
“N” range10 – 14 VIgnition switch ON, Selector lever at “N”
range
5Or / B
(switch)
(A / T only).“P” rangeIgnition switch ON, Selector lever at “P”
range
6—Blank–—
7—Blank–—
8RHeated oxygen sensor-2Refer to DTC flow chart
9————
015VIgnition switch ON fuel tank fully filled10Y/RFuel level sensor (gauge)0 – 1.5 VIgnition switch ON, fuel tank fully filled10Y/RFuel level sensor (gauge)355VIgnition switch ON fuel tank emptied3 – 5.5 VIgnition switch ON, fuel tank emptied
11—Blank——
12R/GData link connector
(OBD serial data line)10 – 14 VIgnition switch ON
13PVehicle speed sensor (–) (A / T)0.4 – 0.8 VIgnition switch ON
14G/BlTransmis-
sion range
“L” rangeSelector lever at “L”
range
15G/R
sion range
sensor
(switch)
“D” range10 – 14 VIgnition
switch ONSelector lever at “D”
range
16R
(switch)
(A / T)“R” rangeSelector lever at “R”
range
17Lg/RA / C ON (output) signal for A / C
controller (if equipped)
0 – 1 VWhile engine running and A / C not
operating
gcontroller (if equipped)10 – 14 VWhile engine running and A / C operating
18Br / YElectric load signal
0 –1 V
Ignition switch ON
Headlight, small light, heater fan and
rear window defogger turned OFF
18Br / YElectric load signal
10 – 14 V
Ignition switch ON
Headlight, small light, heater fan and
rear window defogger turned ON
19Bl / RA / C (input) signal for A / C
amplifier
10 – 14 VWhile engine running and A / C not
operating
amplifier0 – 0.6 VWhile engine running and A / C operating
20B/WIgnition switch10 – 14 VIgnition switch ON
21—Blank——
22—Blank——

6-38 ENGINE GENERAL INFORMATION AND DIAGNOSIS (TBI FOR G10)
1 2
1. ECM (PCM)
coupler disconnected
2. Ohmmeter
RESISTANCE CHECK
1) Disconnect ECM (PCM) couplers from ECM (PCM) with ignition
switch OFF.
CAUTION:
Never touch terminals of ECM (PCM) itself or connect
voltmeter or ohmmeter.
2) Check resistance between each terminal of couplers discon-
nected.
CAUTION:

Be sure to connect ohmmeter probe from wire harness
side of coupler.

Be sure to turn OFF ignition switch for this check.

Resistance in table below represents that when parts
temperature is 20C (68F).
TERMINALSCIRCUITSTANDARD RESISTANCE
C01-8 to C03-20H02S-1 heater11.7 – 14.3 Ω
C02-19 to C03-20H02S-2 heater11.7 – 14.3 Ω
C02-12 to C02-2 / 15Fuel injector2.4 – 3.6 Ω
C02-7 to C02-2 / 15EVAP canister purge valve30 – 34 Ω
C02-21 to C03-20Fuel pump relay100 – 120 Ω
C02-16 to C02-2 / 15ISC actuator relay100 – 120 Ω
C02-25 to C02-2 / 15EFE heater relay100 – 120 Ω
C02-8 to Body groundShift solenoid-B8 – 20 Ω
C02-9 to Body groundShift solenoid-A8 – 20 Ω
C02-20 to C02-2 / 15Radiator fan control relay100 – 120 Ω
C02-22 to C02-14Main relay100 – 120 Ω
C02-1 to Body groundGroundContinuity
C02-13 to Body groundGroundContinuity
C02-26 to Body groundGroundContinuity

Main fuse Ignition switch
Main fuseMalfunction indicator lamp in combination meter
Relay box“IG COIL METER”
6-42 ENGINE GENERAL INFORMATION AND DIAGNOSIS (TBI FOR G10)
TABLE A-3 ECM (PCM) POWER AND GROUND CIRCUIT CHECK – MIL
DOESN’T LIGHT AT IGNITION SWITCH ON AND ENGINE DOESN’T
START THOUGH IT IS CRANKED UP
CIRCUIT DESCRIPTION
When the ignition switch tuned ON, the main relay turns ON (the contact point closes) and the main power is sup-
plied to ECM (PCM).
INSPECTION
STEPACTIONYESNO
1Main Relay Operating Sound Check
Is operating sound of main relay heard at ignition switch ON?Go to Step 5.Go to Step 2.
2Main Relay Check
1) Turn OFF ignition switch and remove main relay (1).
2) Check for proper connection to main relay (1) at terminal
3 and 4.
3) Check resistance between each two terminals. See Fig. 1
and 2.
Between terminals 1 and 2: Infinity
Between terminals 3 and 4: 100 – 120 Ω
4) Check that there is continuity between terminals 1 and 2
when battery is connected to terminals 3 and 4. See Fig. 3.
Is main relay in good condition?Go to Step 3.Replace main
relay.
3Fuse Check
Is main “FI” fuse in good condition?Go to Step 4.Check for short in
circuits connected
to this fuse.
4ECM (PCM) Power Circuit Check
1) Turn OFF ignition switch, disconnect connectors from ECM
(PCM) and install main relay.
2) Check for proper connection to ECM (PCM) at terminals
C03-20, C02-2, C02-15 and C02-22.
3) If OK, then measure voltage between terminal C03-20 and
ground, C02-22 and ground with ignition switch ON.
Is each voltage 10 – 14 V?Go to Step 5.“B/W”, “W/R” or
“Bl / B” circuit
open.