ECU SUZUKI SWIFT 2000 1.G SF310 Service Repair Manual

ENGINE AND EMISSION CONTROL SYSTEM (SFI FOR G13) 6E2-27
ELECTRONIC CONTROL SYSTEM
ENGINE CONTROL MODULE (POWERTRAIN
CONTROL MODULE) [ECM (PCM)]
CAUTION:
As ECM (PCM) consists of precision parts, be careful not to
expose it to excessive shock.
Removal
1) Disconnect battery negative cable at battery.
2) Disable air bag system, refer to “DISABLING THE AIR BAG
SYSTEM” in Section 9J if equipped.
3) Lower fuse box after removing screws and remove fuse box
bracket.
4) Remove ECM (PCM) (1) from body.
5) Disconnect couplers from ECM (PCM).
Installation
Reverse removal procedure noting the following:

Connect couplers to ECM (PCM) securely.
MANIFOLD ABSOLUTE PRESSURE SENSOR (MAP
SENSOR)
Inspection
Check MAP sensor referring to “MAP Sensor Individual Check” in
DTC P0105 Flow Table. If malfunction is found, replace.

1
2
3
1. Ground terminal
2. Reference voltage terminal
3. Output voltage terminal
(a)
1
23
4
6E2-28 ENGINE AND EMISSION CONTROL SYSTEM (SFI FOR G13)
THROTTLE POSITION SENSOR (TP SENSOR)
Inspection
1) Disconnect negative cable at battery and coupler from TP sen-
sor.
2) Using ohmmeter, check resistance between terminals under
each condition given in table below.
TERMINALS
RESISTANCE
Between 1 and
2 terminals2.5 – 6.0 kΩ
Between 1 and
Throttle valve is
at idle position0.17 – 11.4 kΩ
3 terminalsThrottle valve is
fully opened1.72 – 15.50 kΩ
NOTE:
There should be more than 1.5 kΩ resistance difference
between when throttle valve is at idle position and when
it is fully open.
If check result is not satisfactory, replace TP sensor.
3) Connect TP sensor coupler securely.
4) Connect negative cable to battery.
Removal
1) Disconnect battery negative cable at battery.
2) Disconnect coupler from TP sensor.
3) Remove TP sensor from throttle body.
Installation
1) Install TP sensor (1) to throttle body.
Fit TP sensor to throttle body in such way that its holes (3) are
a little away from TP sensor screw holes (2) as shown in left fig-
ure and turn TP sensor clockwise so that those holes align (4).
Tightening Torque
(a): 2.0 N
.m (0.20 kg-m, 1.5 lb-ft)
2) Connect coupler to TP sensor securely.
3) Connect battery negative cable to battery.

ENGINE AND EMISSION CONTROL SYSTEM (SFI FOR G13) 6E2-29
INTAKE AIR TEMPERATURE SENSOR (IAT SENSOR)
Removal
1) Disconnect battery negative cable at battery.
2) Disconnect coupler from IAT sensor (1).
3) Remove IAT sensor (1) from air cleaner outlet hose (2).
Inspection
Immerse temperature sensing part of IAT sensor in water (or ice)
and measure resistance between sensor terminals while heating
water gradually.
If measured resistance doesn’t show such characteristic as shown
in left figure, replace IAT sensor.
Installation
Reverse removal procedure noting the following.

Clean mating surfaces of IAT sensor and air cleaner outlet hose.

Connect IAT sensor coupler (1) securely.

2.297 – 2.595
0.298 – 0.320
6E2-30 ENGINE AND EMISSION CONTROL SYSTEM (SFI FOR G13)
ENGINE COOLANT TEMPERATURE SENSOR
(ECT SENSOR)
Removal
1) Disconnect battery negative cable at battery.
2) Drain coolant referring to Section 6B.
WARNING:
To help avoid danger of being burned, do not remove ra-
diator cap while engine and radiator are still hot.
Scalding fluid and steam can be blown out under pres-
sure if cap is taken off too soon.
3) Disconnect coupler from ECT sensor.
4) Remove ECT sensor (1) from thermostat case.
Inspection
Immerse temperature sensing part of ECT sensor (1) in water (or
ice) and measure resistance between terminal “A” and “B” while
heating water gradually.
If measured resistance doesn’t show such characteristic as shown
in left figure, replace ECT sensor (1).
Installation
Reverse removal procedure noting the following:

Clean mating surfaces of ECT sensor (1) and thermostat case.

Check O-ring for damage and replace if necessary.

Tighten ECT sensor (1) to specified torque.
Tightening Torque
(a): 12 N
.m (1.2 kg-m, 9.0 lb-ft)

Connect coupler to ECT sensor (1) securely.

Refill coolant referring to Section 6B.

ENGINE AND EMISSION CONTROL SYSTEM (SFI FOR G13) 6E2-31
1. Viewed from terminal side
Sensor-1
Sensor-2
“VB”
“GND”
HEATED OXYGEN SENSOR (Sensor-1 and Sensor-2)
Oxygen Sensor Heater Inspection
1) Disconnect sensor coupler.
2) Using ohmmeter, measure resistance between terminals “V
B”
and “GND” of sensor coupler.
NOTE :
Temperature of sensor affects resistance value largely.
Make sure that sensor heater is at correct temperature.
Resistance of oxygen sensor heater :
11.7 – 14.3 Ω at 20C, 68F
If found faulty, replace oxygen sensor.
3) Connect sensor coupler securely.
Removal
WARNING:
To avoid danger of being burned, do not touch exhaust sys-
tem when system is hot. Oxygen sensor removal should be
performed when system is cool.
1) Disconnect negative cable at battery.
2) For sensor-1, disconnect coupler of heated oxygen sensor and
release its wire harness from clamps and remove exhaust man-
ifold cover (1).
3) For sensor-2, disconnect coupler of heated oxygen sensor and
release its wire harness from clamp and hoist vehicle.
4) Remove heated oxygen sensor (2) from exhaust manifold or ex-
haust pipe.
Installation
Reverse removal procedure noting the following.

Tighten heated oxygen sensor (2) to specified torque.
Tightening Torque for heated oxygen sensor
(a): 45 N·m (4.5 kg-m, 32.5 lb-ft)

Connect coupler of heated oxygen sensor (2) and clamp wire har-
ness securely.

After installing heated oxygen sensor (2), start engine and check
that no exhaust gas leakage exists.

(a)
6E2-32 ENGINE AND EMISSION CONTROL SYSTEM (SFI FOR G13)
CAMSHAFT POSITION SENSOR
Inspection
Check camshaft position sensor referring to DTC P0340 Diag. Flow
Table in Section 6. If malfunction is found, replace.
Removal
1) Disconnect negative cable at battery.
2) Disconnect connector from camshaft position sensor.
3) Remove camshaft position sensor from sensor case
(distributorless ignition case).
Installation
1) Check that O-ring is free from damage.
2) Check that camshaft position sensor and signal rotor tooth are
free from any metal particles and damage.
3) Install camshaft position sensor to sensor case.
Tightening Torque
(a): 9 N
.m (0.9 kg-m, 6.5 lb-ft)
4) Connect connector to it securely.
5) Connect negative cable to battery.
CRANKSHAFT POSITION SENSOR
Inspection
Check crankshaft position sensor referring to step 1 and 2 of DTC
P0335 Flow Table. If malfunction is found, replace.
Removal
1) Hoist vehicle.
2) Disconnect connector from crankshaft position sensor.
3) Remove crankshaft position sensor from oil pan.
Installation
1) Check to make sure that crankshaft position sensor and pulley
tooth is free from any metal particles and damage.
2) Install crankshaft position sensor to oil pan.
Tightening Torque
(a): 10 N
.m (1.0 kg-m, 7.5 lb-ft)
CAUTION:
Be sure to tighten to specified torque. CKP sensor will be
deformed if overtightened and correct CKP sensor signal
will not be fed if loosened.
3) Connect connector to it securely.

IGNITION SYSTEM 6F-3
DIAGNOSIS
ConditionPossible CauseCorrection
Engine cranks, but will
not start or hard to start
Blown fuse for ignition coil

Loose connection or disconnection of lead wire or
high-tension cord(s)

Faulty high-tension cord(s)

Faulty spark plug(s)

Cracked rotor or cap

Maladjusted signal rotor air gap

Faulty ignition coil

Faulty noise suppressor

Faulty CMP sensor

Faulty igniter

Faulty ECM (or PCM)

Maladjusted ignition timingReplace
Connect securely
Replace
Adjust, clean or replace
Replace
Adjust
Replace
Replace
Replace
Replace
Replace
Adjust
Poor fuel economy or
engine performance
Incorrect ignition timing

Faulty spark plug(s) or high-tension cord(s)

Faulty ECM (or PCM)Adjust
Adjust, clean or replace
Replace
DIAGNOSTIC FLOW TABLE
STEPACTIONYESNO
1Was “Engine Diagnostic Flow Table” in SECTION 6
performed?Go to Step 2.Go to “Engine
Diagnostic Flow
Table” in SECTION 6.
2Ignition Spark Test
1) Check all spark plug for condition and type,
referring to “Spark Plugs” in this section.
2) If OK, perform ignition spark test, referring to
“Ignition Spark Check” in this section.
Is spark emitted from all spark plugs?Go to Step 11 on the
next page.Go to Step 3.
3Diagnostic Trouble Code (DTC) Check
1) Check DTC stored in ECM (or PCM), referring to
“Diagnostic Trouble Code (DTC) Check” in
SECTION 6.
Is DTC stored?Go to applicable flow
table corresponding to
that code No. in
SECTION 6.Go to Step 4.
4Electrical Connection and Noise Suppressor Check
1) Check ignition coil for electrical connection and
noise suppressor for conductivity.
Are they good condition?Go to Step 5.Repair or replace.
5High-tension Cord Check
1) Check high-tension cord for resistance, referring
to “High-tension Cords” in this section.
Is check result satisfactory?Go to Step 6.Replace high-tension
cord(s).

6F-6 IGNITION SYSTEM
6) If resistance exceeds specification, inspect distributor terminal
and replace high-tension cord(s) and/or distributor cap as re-
quired.
CAUTION:

Never attempt to use metal conductor high-tension cords
as replacing parts.

Insert each cap portion fully when installing high-tension
cords.
SPARK PLUGS
1) Pull out high-tension cords by gripping their caps and then re-
move spark plugs.
2) Inspect them for:

Electrode wear

Carbon deposits

Insulator damage
3) If any abnormality is found, adjust air gap, clean with spark plug
cleaner or replace them with specified new plugs.
Spark plug air gap “a’’: 1.0 – 1.1 mm (0.039 – 0.043 in.)
Spark plug type : NGK BPR6ES-11
: DENSO W20EPR-U11
4) Install spark plugs and torque them to specification.
Tightening Torque for spark plug
25 N
.m (2.5 kg-m, 18.0 lb-ft)
5) Install high-tension cords securely by gripping their caps.
NOISE SUPPRESSOR
REMOVAL
1) Unwrap tape from noise suppressor.
2) Disconnect coupler of noise suppressor.
3) Remove noise suppressor.
INSTALLATION
Reverse removal procedure for installation.
INSPECTION
Using an ohmmeter (1) to check continuity as the following.
“a” – “b”: No continuity
“a” – “c”: No continuity
“c” – “d”: Continuity (Approx. 2.2 kΩ)
If check result is not satisfactory, replace noise suppressor (2).

1. Pickup coil
2. Signal rotor
3. Screws
1. Distributor
2. Coupler
3. Ohmmeter
6F-8 IGNITION SYSTEM
DISTRIBUTOR
DISTRIBUTOR CAP AND ROTOR
INSPECTION
Check cap and rotor for crack and their terminals for corrosion and
wear. Replace as necessary.
SIGNAL ROTOR AIR GAP
INSPECTION
1) Remove distributor cap and rotor.
2) Using thickness gauge, measure air gap, between signal rotor
tooth and CMP sensor (generator).
Signal rotor air gap “a”: About 0.2 mm (about 0.008 in.)
3) If gap is out of specification, loose CMP sensor (signal genera-
tor) securing screws. Using blade (–) screw driver, move CMP
sensor (generator) and adjust gap to specification. After adjust-
ment, tighten securing screws and recheck gap.
NOTE:
Check to make sure that CMP sensor (signal generator)
tooth is free from any metal particles.
4) Install distributor cap and rotor.
CMP SENSOR (PICKUP COIL) RESISTANCE
INSPECTION
1) Disconnect distributor lead coupler.
2) Measure resistance of pickup coil by using ohmmeter.
3) If resistance is out of specification, replace CMP sensor (signal
generator) as follows.
Pickup coil resistance:
185 – 275 Ω at – 10C (14F) – 50C (122F)
240 – 325 Ω at 50C (122F) – 100C (212F)
4) Remove distributor cap and rotor.
5) Remove CMP sensor (signal generator) securing screws and
lead wire clamp screws.
6) Replace CMP sensor (signal generator).
7) Adjust signal rotor air gap to specifications as previously out-
lined.
8) Install rotor, distributor cap seal and cap.

1. Ignition switch
2. Main relay
3. Ignition coil assembly
for No.1 and No.4
spark plugs
4. Ignition coil assembly
for No.2 and No.3
spark plugs5. CMP sensor
6. CKP sensor
7. No.1 spark plug
8. No.2 spark plug
9. No.3 spark plug
10. No.4 spark plug11. Sensed information

MAP sensor

ECT sensor

IAT sensor

TP sensor

VSS
Park / Neutral position signal
(A / T)

Electric load signal

Engine start signal
IGNITION SYSTEM (SFI FOR G13) 6F1-3
SYSTEM WIRING DIAGRAM
DIAGNOSIS
ConditionPossible CauseCorrection
Engine cranks, but will
not start or hard to
startNo spark

Blown fuse for ignition coil

Loose connection or disconnection of lead
wire or high-tension cord(s)

Faulty high-tension cord(s)

Faulty spark plug(s)

Faulty ignition coil

Faulty CKP sensor or crankshaft timing belt
pulley

Faulty ECM (PCM)
Replace.
Connect securely.
Replace.
Adjust, clean or replace.
Replace ignition coil assembly.
Clean, tighten or replace.
Replace.
Poor fuel economy or
engine performance
Incorrect ignition timing

Faulty spark plug(s) or high-tension cord(s)

Faulty ignition coil assembly

Faulty CKP sensor or crankshaft timing belt
pulley

Faulty ECM (PCM)Check related sensors and
crankshaft timing belt pulley.
Adjust, clean or replace.
Replace.
Clean, tighten or replace.
Replace.