2000 SUZUKI SWIFT SF310 Service Workshop Manual

1 2
1. ECM (PCM) coupler disconnected
2. Ohmmeter
ENGINE GENERAL INFORMATION AND DIAGNOSIS (SFI FOR G13) 6-1-37
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
C01-7 to C03-6HO2S-1 heater11.7 – 15.6 Ω
C02-4 to C03-6HO2S-2 heater11.7 – 15.6 Ω
C01-9 to C02-5 / 6No.1 injector12.0 – 13.0 Ω
C01-21 to C02-5 / 6No.2 injector12.0 – 13.0 Ω
C01-31 to C02-5 / 6No.3 injector12.0 – 13.0 Ω
C01-8 to C02-5 / 6No.4 injector12.0 – 13.0 Ω
C02-2 to C02-5 / 6EGR valve (stepper motor coil 4)20 – 24 Ω
C02-9 to C02-5 / 6EGR valve (stepper motor coil 3)20 – 24 Ω
C02-8 to C02-5 / 6EGR valve (stepper motor coil 2)20 – 24 Ω
C02-17 to C02-5 / 6EGR valve (stepper motor coil 1)20 – 24 Ω
C01-4 to C02-5 / 6EVAP canister purge valve30 – 34 Ω
C02-19 to C03-6Fuel pump relay70 – 110 Ω
C02-1 to Body groundA / C control moduleNo continuity
C02-18 to C02-5 / 6Radiator fan control relay70 – 110 Ω
C02-10 to C02-7Main relay70 – 110 Ω
C01-1 to Body groundGroundContinuity
C01-2 to Body groundGroundContinuity
C01-3 to Body groundGroundContinuity

INFORMATION SENSORS
-1. MAP sensor
-2. TP sensor
-3. IAT sensor
-4. ECT sensor
-5. Heated oxygen sensor-1
5-1. Heated oxygen sensor-2
-6. VSS (A / T)
-7. Transmission range switch (A / T)
-8. Battery
-9. CMP sensor
-10. CKP sensor
-11. Fuel level sensor (gauge) (in fuel tank)
-12. PSP switch
-13. A / C control module (if equipped)
-14. VSS (speedometer) (M / T)OTHERS
A: ECM (PCM)
B: Main relay
C: EVAP canister
D: Data link connector CONTROL DEVICES
a: Fuel injector
b: EVAP canister purge valve
c: Fuel pump relay
d: EGR valve (step motor)
e: Malfunction indicator lamp
f: Ignition coil assembly
g: Radiator fan control relay
h: IAC valve
6-1-38 ENGINE GENERAL INFORMATION AND DIAGNOSIS (SFI FOR G13)
COMPONENT LOCATION

Main
fuseIgnition
switch
Main
relay Malfunction indicator lamp in combination meter
Relay
box Fuse box
C01-1
C01-2
C01-3
ENGINE GENERAL INFORMATION AND DIAGNOSIS (SFI FOR G13) 6-1-39
TABLE A-1 MALFUNCTION INDICATOR LAMP CIRCUIT CHECK – LAMP DOES
NOT COME “ON” AT IGNITION SWITCH ON (BUT ENGINE AT STOP)
CIRCUIT DESCRIPTION
When the ignition switch is turned ON, ECM (PCM) causes the main relay to turn ON (close the contact point).
Then, ECM (PCM) being supplied with the main power, turns ON the malfunction indicator lamp (MIL). When the
engine starts to run and no malfunction is detected in the system, MIL goes OFF but if a malfunction was or is de-
tected, MIL remains ON even when the engine is running.
INSPECTION
STEPACTIONYESNO
1MIL Power Supply Check
1) Turn ignition switch ON.
Do other indicator / warning lights in
combination meter comes ON?Go to Step 2.“IG” fuse blown, main
fuse blown, ignition switch
malfunction, “B/W” circuit
between “IG” fuse and
combination meter or poor
coupler connection at
combination meter.
2ECM (PCM) Power and Ground Circuit
Check Does engine start?Go to Step 3.Go to TABLE A-3 ECM (PCM)
POWER AND GROUND
CIRCUIT CHECK.
If engine is not cranked, go to
DIAGNOSIS in SECTION 6G.
3MIL Circuit Check
1) Turn ignition switch OFF and disconnect
connectors from ECM (PCM).
2) Check for proper connection to ECM
(PCM) at terminal C03-1.
3) If OK, then using service wire, ground
terminal C03-1 in connector
disconnected.
Does MIL turn on at ignition switch ON?Substitute a
known-good ECM
(PCM) and recheck.Bulb burned out or “V” wire
circuit open.

6-1-40 ENGINE GENERAL INFORMATION AND DIAGNOSIS (SFI FOR G13)
TABLE A-2 MALFUNCTION INDICATOR LAMP CIRCUIT CHECK – LAMP
REMAINS “ON” AFTER ENGINE STARTS
WIRING DIAGRAM / CIRCUIT DESCRIPTION – Refer to table A-1.
INSPECTION
STEPACTIONYESNO
1Diagnostic Trouble Code (DTC) check
1) Check DTC referring to DTC CHECK section.
Is there any DTC(s)?Go to Step 2 of ENGINE
DIAG. FLOW TABLE.Go to Step 2.
2DTC check
Start engine and recheck DTC while engine
running.
Is there any DTC(s)?Go to Step 3.
3MIL Circuit check
1) Turn OFF ignition switch.
2) Disconnect connectors from ECM (PCM).
Does MIL turn ON at ignition switch ON?“V” wire circuit shorted to
ground.Substitute a known-good
ECM (PCM) and
recheck.

Main
fuseIgnition
switch
Main
relay Malfunction indicator lamp in combination meter
Relay
box
Fuse box
ENGINE GENERAL INFORMATION AND DIAGNOSIS (SFI FOR G13) 6-1-41
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 – 150 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
C03-6, C02-10, C02-5 and C02-6.
3) If OK, then measure voltage between terminal C03-6 and
ground, C02-10 and ground with ignition switch ON.
Is each voltage 10 – 14 V?Go to Step 5.“B/W”, “W/R” or
“Gr” circuit open.

6-1-42 ENGINE GENERAL INFORMATION AND DIAGNOSIS (SFI FOR G13)
Fig. 1 for Step 2 Fig. 2 for Step 2 Fig. 3 for Step 2
STEPACTIONYESNO
5ECM (PCM) Power Circuit Check
1) Using service wire, ground terminal C02-10 and
measure voltage between terminal C02-5 / 6 and
ground at ignition switch ON.
Is it 10 – 14 V?Check ground circuits
“B/Y” and “B” for
open.
If OK, then substitute a
known-good ECM
(PCM) and recheck.Go to Step 6.
6Is operating sound of main relay heard in Step 1?Go to Step 7.“W/R” or “R/B” wire
open.
7Main Relay Check
1) Check main relay according to procedure in
Step 2.
Is main relay in good condition?“W/R” or “R/B” wire
open.Replace main relay.

MAP
sensor
To other sensorsTo TP sensor
ENGINE GENERAL INFORMATION AND DIAGNOSIS (SFI FOR G13) 6-1-43
DTC P0105 MANIFOLD ABSOLUTE PRESSURE (MAP) CIRCUIT
MALFUNCTION
CIRCUIT DESCRIPTION
DTC DETECTING CONDITIONPOSSIBLE CAUSE

MAP: 4.9 kpa, 37 mmHg or less
(Low pressure – High vacuums – Low voltage)

MAP: 114.7 kpa, 860 mmHg or more
(High pressure – Low vacuums – High voltage)
“G” circuit open

“P” circuit open or shorted to ground

“G” circuit open or shorted to ground

MAP sensor malfunction

ECM (PCM) malfunction
NOTE:
When DTC P0120 is indicated together, it is possible that “P” circuit is open.
DTC CONFIRMATION PROCEDURE
1) Clear DTC, start engine and keep it at idle for 1 min.
2) Select “DTC” mode on scan tool and check DTC.

6-1-44 ENGINE GENERAL INFORMATION AND DIAGNOSIS (SFI FOR G13)
MAP Sensor Individual Check
1) Disconnect coupler from MAP sensor (1).
2) Remove MAP sensor (1).
3) Arrange 3 new 1.5 V batteries (2) in series (check that total volt-
age is 4.5 – 5.0 V) and connect its positive terminal to “Vin” termi-
nal of sensor and negative terminal to “Ground” terminal. Then
check voltage between “Vout” and “Ground”.
Also, check if voltage reduces when vacuum is applied up to 400
mmHg by using vacuum pump (3).
Output voltage (Vin voltage 4.5 – 5.5 V, ambient temp. 20 –
30C, 68 – 86F)
ALTITUDE
BAROMETRICOUTPUT
(Reference)PRESSUREVOLTAGE
(ft)(m)(mmHg)(kPa)(V)
0


0


760


100

3343

2 000


610


707


94
3.3 – 4.3
2 001


611

Under 70794

3041

5 000


1 524over 634

85
3.0 – 4.1
5 001


1 525

Under 63485

2737

8 000


2 438over 567

76
2.7 – 3.7
8 001


2 439

Under 56776

25–33

10 000


3 048over 526

70
2.5 – 3.3
If check result is not satisfactory, replace MAP sensor (1).
4) Install MAP sensor (1) securely.
5) Connect MAP sensor (1) coupler securely.