engine SUZUKI SWIFT 2000 1.G RG413 Service Owners Manual

6-36 ENGINE GENERAL INFORMATION AND DIAGNOSIS
INSPECTION OF ECM AND ITS CIRCUITS
ECM and its circuits can be checked at ECM wiring couplers by
measuring voltage and resistance.
VOLTAGE CHECK
1) Remove ECM (1) from vehicle body referring to Section 6E.
2) Check voltage at each terminal of couplers (2) connected.CAUTION:
ECM cannot be checked by itself. It is strictly prohibited
to connect voltmeter or ohmmeter to ECM with coupler
disconnected from it.
NOTE:
As each terminal voltage is affected by the battery volt-
age, confirm that it is 11 V or more when ignition switch
is ON.
1
1. ECM
2. ECM couplers (Viewed from harness side)
C42 (31P) C41 (24P) G02 (17P)1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16 17 18 19 20 21
22 23 24 25 26 28 27 29 30 315 6
1 2 3 4 5 6 7
11 12
9 10 11 13 12 14 15 16
16 171 2
7 8
13 14 3 4
9 10
15 17 188
19 20 21 22 23 24
2
1

ENGINE GENERAL INFORMATION AND DIAGNOSIS 6-37
ECM VOLTAGE VALUES TABLE
For TYPE A (See NOTE)
NOTE:
Type A is other than follows.
Type B is right hand steering vehicle equipped with fasten seat belt light and immobilizer control sys-
tem.
TERMINAL NO. CIRCUIT NORMAL VOLT-
AGECONDITION
C421 Ground––
2 Ground––
3 Ground––
4 EVAP canister purge valve 10 – 14 V Ignition switch ON
5 Engine coolant temp. and barometric
pressure signal for TCM (A/T)Indication
deflection
repeated 0 V
and 10 – 14 VIgnition switch ON
6 Idle air control valve 0 – 13 V At specified idle speed after engine warmed up
7 Heater of HO2S-1 (if equipped) 10 – 14 V Ignition switch ON
8 Fuel injector NO.4 10 – 14 V Ignition switch ON
9 Fuel injector NO.1 10 – 14 V Ignition switch ON
10 Sensor ground––
11 Camshaft position sensor 0 – 0.8 V and
4 – 6 VIgnition switch ON
12 Knock sensor (if equipped) 2.1 - 2.9 V Ignition switch ON
13 Heated oxygen sensor-1 (if equipped) Refer to DTC P0130 diag. flow table
CO adjusting resistor (if equipped)––
14 Engine coolant temp. sensor 0.55 - 0.95 V Ignition switch ON
Engine coolant temp. : 80°C (176°F)
15 Intake air temp. sensor 2.0 – 2.7 V Ignition switch ON
Intake air temp. : 20°C (68°F)
16 Test switch terminal (Vehicle without
immobilizer indicator lamp)4 – 6 V Ignition switch ON
17 Electric load signal (+) 0V Ignition switch ON
Small light and rear defogger OFF
10 – 14 V Ignition switch ON
Small light and rear defogger ON
18 A/C triple pressure switch 10 – 14 V A/C not operated
19 Ignition coil #2––
20 Ignition coil #1––
21 Fuel injector NO.2 10 – 14 V Ignition switch ON
22 Power source for sensor 4.75 – 5.25 V Ignition switch ON
23 Crankshaft position sensor––
24–– –
25 Shield ground––
26 Manifold absolute pressure sensor 3.3 – 4.0 V Ignition switch ON
Barometric pressure : 100 kPa (760 mmHg)
27 Diag. Switch terminal (Vehicle without
immobilizer indicator lamp)4 – 6 V Ignition switch ON
28 Monitor output (Vehicle without immo-
bilizer indicator lamp)––
29 Blank––
30 Blank––
31 Fuel injector NO.3 10 – 14 V Ignition switch ON

6-38 ENGINE GENERAL INFORMATION AND DIAGNOSIS
TERMINAL
NO.CIRCUIT NORMAL
VOLTAGECONDITION
C411 A/C compressor clutch 0 V Ignition switch ON
2 EGR valve (stepper motor coil 1)
(if equipped)10 – 14 V Ignition switch ON
3 Throttle position sensor 0.2 – 1.0 V Ignition switch ON
Throttle valve at idle position
2.8 – 4.8 V Ignition switch ON
Throttle valve at full open position
4 Heater of HO2S-2
(Vehicle with immobilizer indicator lamp)10 – 14 V Ignition switch ON
5 Power source 10 – 14 V Ignition switch ON
6 Power source 10 – 14 V Ignition switch ON
7 Engine start switch
(Engine start signal)6 – 12 V While engine cranking
0 V Other than above
8 EGR valve (stepper motor coil 3)
(if equipped)10 – 14 V Ignition switch ON
9 EGR valve (stepper motor coil 2)
(if equipped)10 – 14 V Ignition switch ON
10 Main relay 10 – 14 V Ignition switch OFF
0.4 – 1.5 V Ignition switch ON
11 Blank––
12 Blank––
13 Heated oxygen sensor-2
(Vehicle with immobilizer indicator lamp)Refer to DTC P0130 diag. flow table
14 D-range ID-up signal (A/T) 10 – 14 V Ignition switch ON
15 R-range signal (A/T) 0 V Ignition switch ON
16 A/C (input) signal 10 – 14 V Ignition switch ON
A/C switch OFF
0 – 2 V Ignition switch ON
A/C switch ON
17 EGR valve (stepper motor coil 4)
(if equipped)10 – 14 V Ignition switch ON
18 Radiator fan control relay 10 – 14 V Ignition switch ON
Engine coolant temp. : 9.5°C or
lower (203°F)
0 – 1 V Ignition switch ON
Engine coolant temp. : 97.5°C
(208°F) or higher
19 Fuel pump relay 0 – 1 V For 2 seconds after ignition switch
ON
10 – 14 V After the above time
20–––

ENGINE GENERAL INFORMATION AND DIAGNOSIS 6-39
C4121 Throttle opening signal for TCM
(A/T)Indication
deflection
repeated
0 V and
10 – 14 VIgnition switch ON
22 Fuel level sensor (gauge)
(Vehicle with immobilizer indicator lamp)0 – 2 V Ignition switch ON
Fuel tank fully filled
4.5 – 7.5 V Ignition switch ON
Fuel tank emptied
23 Serial data for TCM 10 – 14 V
and 0 – 1 VIgnition switch ON
24 Blank–– TERMINAL
NO.CIRCUIT NORMAL
VOLTAGECONDITION
TERMINAL
NO.CIRCUIT NORMAL
VOLTAGECONDITION
G021 Malfunction indicator lamp 0 – 1 V Ignition switch ON
10 – 14 V When engine running
2 Vehicle speed sensor Indicator
deflection
repeated
0 V and
4 – 6 VIgnition switch ON
Front left tire turned slowly with front
right tire locked
3 Radiator fan control relay 10 – 14 V Ignition switch ON and Engine coolant
temp. : 100°C (212°F) or lower
0 – 1 V Ignition switch ON and Engine coolant
temp. : 102.5°C (216.5°F) or higher
4 Blank––
5 Data link connector
(K line of ISO9141)10 – 14 V Ignition switch ON
6 Ignition switch 10 – 14 V Ignition switch ON
7 Data link connector (SUZUKI serial
data line)4 – 6 V Ignition switch ON
8 Blank––
9 Stop lamp switch 0 V Ignition switch ON
Stop lamp switch OFF
10 – 14 V Ignition switch ON
Stop lamp switch ON
10 Sensor ground––
11 Blank––
12 Immobilizer indicator lamp 0 – 1 V Ignition switch ON
10 – 14 V When engine running
13 Electric load signal (–)0 – 2 V Ignition switch ON
Blower fan turned OFF
10 – 14 V Ignition switch ON
Blower fan turned ON
14 A/C evaporator temp. sensor––
15 Blank––
16 Tachometer (if equipped) 0 – 1 V Ignition switch ON

6-40 ENGINE GENERAL INFORMATION AND DIAGNOSIS
For TYPE B (For applicable mode, refer to NOTE in “ECM VOLTAGE VALUES TABLE”) G02 17 Power source for back-up 10 – 14 V Anytime
TERMINAL NO. CIRCUIT NORMAL VOLT-
AGECONDITION
C421Ground––
2Ground––
3Ground––
4 EVAP canister purge valve 10 – 14 V Ignition switch ON
5–– –
6 Idle air control valve 0 – 13 V At specified idle speed after engine warmed up
7 Heater of HO2S-1 (if equipped) 10 – 14 V Ignition switch ON
8 Fuel injector NO.4 10 – 14 V Ignition switch ON
9 Fuel injector NO.1 10 – 14 V Ignition switch ON
10 Sensor ground––
11 Camshaft position sensor 0 – 0.8 V and
4 – 6 VIgnition switch ON
12 Shield ground––
13 Heated oxygen sensor-1 (if equipped) Refer to DTC P0130 diag. flow table
CO adjusting resistor (if equipped)––
14 Engine coolant temp. sensor 0.55 - 0.95 V Ignition switch ON
Engine coolant temp. : 80°C (176°F)
15 Intake air temp. sensor 2.0 – 2.7 V Ignition switch ON
Intake air temp. : 20°C (68°F)
16 Throttle position sensor 0.2 – 1.0 V Ignition switch ON
Throttle valve at idle position
2.8 – 4.8 V Ignition switch ON
Throttle valve at full open position
17 EGR valve (stepper motor coil 3)
(if equipped)10 – 14 V Ignition switch ON
18 EGR valve (stepper motor coil 1)
(if equipped)10 – 14 V Ignition switch ON
19 Ignition coil #2––
20 Ignition coil #1––
21 Fuel injector NO.2 10 – 14 V Ignition switch ON
22 Power source for sensor 4.75 – 5.25 V Ignition switch ON
23 Crankshaft position sensor––
24–– –
25 knock sensor (if equipped) 2.1 – 2.9 V Ignition switch ON
26 Manifold absolute pressure sensor 3.3 – 4.0 V Ignition switch ON
Barometric pressure : 100 kPa (760 mmHg)
27–– –
28 EGR valve (stepper motor coil 4)
(if equipped)10 – 14 V Ignition switch ON
29 EGR valve (stepper motor coil 2)
(if equipped)10 – 14 V Ignition switch ON
30 A/C triple pressure switch 10 – 14 V A/C not operated
31 Fuel injector NO.3 10 – 14 V Ignition switch ON
TERMINAL
NO.CIRCUIT NORMAL
VOLTAGECONDITION

ENGINE GENERAL INFORMATION AND DIAGNOSIS 6-41
TERMINAL
NO.CIRCUIT NORMAL
VOLTAGECONDITION
C411 A/C compressor clutch 0 V Ignition switch ON
2–––
3–––
4–––
5 Power source 10 – 14 V Ignition switch ON
6 Power source 10 – 14 V Ignition switch ON
7 Power source for back-up 10 – 14V Anytime
8 Monitor output (Vehicle without immobi-
lizer indicator lamp)––
9 Radiator fan control relay 10 – 14 V Ignition switch ON and Engine
coolant temp. : 100°C (212°F)or
lower
0 – 1 V Ignition switch ON and Engine
coolant temp. : 102.5°C (216.5°F)
or higher
10 Main relay 10 – 14 V Ignition switch OFF
0.4 – 1.5 V Ignition switch ON
11 Ignition switch 10 – 14 V Ignition switch ON
12 Blank––
13–––
14 Diag. Switch terminal (Vehicle without
immobilizer indicator lamp)4 – 6 V Ignition switch ON
15 Test switch terminal (Vehicle without
immobilizer indicator lamp)4 – 6 V Ignition switch ON
16 A/C (input) signal 10 – 14 V Ignition switch ON
A/C switch OFF
0 – 2 V Ignition switch ON
A/C switch ON
17 Electric load signal (+) 0 V Ignition switch ON
Small light and rear defogger OFF
10 – 14 V Ignition switch ON
Small light and rear defogger OFF
18 Radiator fan control relay 10 – 14 V Ignition switch ON
Engine coolant temp. : 9.5°C or
lower (203°F)
0 – 1 V Ignition switch ON
Engine coolant temp. : 97.5°C
(208°F) or higher
19 Fuel pump relay 0 – 1 V For 2 seconds after ignition switch
ON
10 – 14 V After the above time
20 Engine start switch
(Engine start signal)6 – 12 V While engine cranking
0 V Other than above

6-42 ENGINE GENERAL INFORMATION AND DIAGNOSIS
C4121 Stop lamp switch 0 V Ignition switch ON
Stop lamp switch OFF
10 – 14 V Ignition switch ON
Stop lamp switch ON
22 Vehicle speed sensor Indication
deflection
repeated
0 V and
10 – 14 VIgnition switch ON
Front left tire turned slowly with
front right tire locked
23–––
24––– TERMINAL
NO.CIRCUIT NORMAL
VOLTAGECONDITION
TERMINAL
NO.CIRCUIT NORMAL
VOLTAGECONDITION
G021 A/C evaporator temp. sensor––
2 R-range signal (A/T) 0 V Ignition switch ON
3–––
4–––
5 Engine coolant temp. and barometric
pressure signal for TCM (A/T)Indication
deflection
repeated
0 V and
10 – 14 VIgnition switch ON
6 D-range ID-up signal (A/T) 10 – 14 V Ignition switch ON
7 Data link connector (SUZUKI serial
data line)4 – 6 V Ignition switch ON
8Blank––
9 Malfunction indicator lamp 0 – 1 V Ignition switch ON
10 – 14 V When engine running
10–––
11 Data link connector
(K line of ISO9141)10 – 14 V Ignition switch ON
12 Blank––
13 Electric load signal (–)0 – 2 V Ignition switch ON
Blower fan turned OFF
10 – 14 V Ignition switch ON
Blower fan turned ON
14 Sensor ground––
15 Throttle opening signal for TCM (A/T) Indication
deflection
repeated
0 V and
10 – 14 VIgnition switch ON
16 Tachometer (if equipped) 0 – 1 V Ignition switch ON
17–––

ENGINE GENERAL INFORMATION AND DIAGNOSIS 6-43
Resistance Check
1) Disconnect ECM couplers from ECM with ignition switch
OFF.
2) Check resistance between each terminal of connectors dis-
connected.
TERMINAL RESISTANCE TABLE
For TYPE A (Refer to NOTE in “ECM VOLTAGE VALUES TABLE” for applicable model) CAUTION:
Never touch terminals of ECM itself or connect voltmeter
or ohmmeter.
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 20°C (68°F).
1. ECM coupler disconnected
2. Ohmmeter
TERMINALS CIRCUIT STANDARD
RESISTANCE
C42-7 to G02-6 HO2S-1 heater (if equipped) 5.0 – 6.4 Ω
C41-4 to G02-6 HO2S-2 heater (if equipped) 12.0 – 14.3 Ω
C42-9 to C41-5/6 No.1 injector 11.3 – 13.8 Ω
C42-21 to C41-5/6 No.2 injector 11.3 – 13.8 Ω
C42-31 to C41-5/6 No.3 injector 11.3 – 13.8 Ω
C42-8 to C41-5/6 No.4 injector 11.3 – 13.8 Ω
C41-2 to C41-5/6 EGR valve (stepper motor coil 1) (if equipped) 20 – 24 Ω
C41-9 to C41-5/6 EGR valve (stepper motor coil 2) (if equipped) 20 – 24 Ω
C41-8 to C41-5/6 EGR valve (stepper motor coil 3) (if equipped) 20 – 24 Ω
C41-17 to C41-5/6 EGR valve (stepper motor coil 4) (if equipped) 20 – 24 Ω
C42-4 to C41-5/6 EVAP canister purge valve 30 – 34 Ω
C41-19 to G02-6 Fuel pump relay 56 – 146 Ω
C41-1 to Body ground A/C compressor clutch 3 – 5.5 Ω
C41-18 to C41-5/6 Radiator fan control relay No.1 56 – 146 Ω
C41-10 to G02-17 Main relay 56 – 146 Ω
C42-1 to Body ground Ground Continuity
C42-2 to Body ground Ground Continuity
C42-3 to Body ground Ground Continuity

6-44 ENGINE GENERAL INFORMATION AND DIAGNOSIS
For TYPE B (Refer to NOTE in “ECM VOLTAGE VALUES TABLE” for applicable model.)
TERMINALS CIRCUIT STANDARD
RESISTANCE
C42-7 to C41-11 HO2S-1 heater (if equipped) 5.0 – 6.4 Ω
C41-4 to C41-11 HO2S-2 heater (if equipped) 12.0 – 14.3 Ω
C42-9 to C41-5/6 No.1 injector 11.3 – 13.8 Ω
C42-21 to C41-5/6 No.2 injector 11.3 – 13.8 Ω
C42-31 to C41-5/6 No.3 injector 11.3 – 13.8 Ω
C42-8 to C41-5/6 No.4 injector 11.3 – 13.8 Ω
C42-18 to C41-5/6 EGR valve (stepper motor coil 1) (if equipped) 20 – 24 Ω
C42-29 to C41-5/6 EGR valve (stepper motor coil 2) (if equipped) 20 – 24 Ω
C42-17 to C41-5/6 EGR valve (stepper motor coil 3) (if equipped) 20 – 24 Ω
C42-28 to C41-5/6 EGR valve (stepper motor coil 4) (if equipped) 20 – 24 Ω
C42-4 to C41-5/6 EVAP canister purge valve 30 – 34 Ω
C41-19 to G02-6 Fuel pump relay 56 – 146 Ω
C41-1 to Body ground A/C compressor clutch 3 – 5.5 Ω
C41-18 to C41-5/6 Radiator fan control relay No.1 56 – 146 Ω
C41-10 to C41-7 Main relay 56 – 146 Ω
C42-1 to Body ground Ground Continuity
C42-2 to Body ground Ground Continuity
C42-3 to Body ground Ground Continuity

ENGINE GENERAL INFORMATION AND DIAGNOSIS 6-45
COMPONENT LOCATION
1. TP sensor 9. Radiator fan control relay No.3 17. ECM
2. MAP sensor 10. EVAP canister purge valve 18. Monitor connector
3. IAC valve 11. ECT sensor 19. VSS
4. IAT sensor 12. Ignition coil with igniter 20. Knock sensor (if equipped)
5. Radiator fan control relay No.1 13. HO2S-1 (if equipped) 21. CMP sensor
6. Main relay 14. HO2S-2 (if equipped) 22. EGR valve (if equipped)
7. Fuel pump relay 15. CKP sensor✱ : This figure shows left-hand steering vehicle, these parts are
installed at the other side for right-hand steering vehicle.
8. Radiator fan control relay No.2 16. TCM
1
3
24
518
6 7
20
19
8
9 1617
21
15
131214
10
22
11