ECM SUZUKI SWIFT 2000 1.G SF310 Service User Guide

6-14 ENGINE GENERAL INFORMATION AND DIAGNOSIS (TBI FOR G10)
DIAGNOSTIC TROUBLE CODE (DTC)
CLEARANCE
1) Connect SUZUKI scan tool (Tech-1) or generic scan tool to data
link connector in the same manner as when making this connec-
tion for DTC check.
2) Turn ignition switch ON.
3) Erase DTC and pending DTC according to instructions dis-
played on scan tool. Refer to scan tool operator’s manual for fur-
ther details.
4) After completing the clearance, turn ignition switch off and dis-
connect scan tool from data link connector.
NOTE:
DTC and freeze frame data stored in ECM (PCM) memory
are also cleared in following cases. Be careful not to clear
them before keeping their record.

When power to ECM (PCM) is cut off (by disconnecting
battery cable, removing fuse or disconnecting ECM
(PCM) connectors for 30 sec. or longer)

When the same malfunction (DTC) is not detected again
during 40 engine warm-up cycles.

6-16 ENGINE GENERAL INFORMATION AND DIAGNOSIS (TBI FOR G10)
DTC
NO.DETECTING ITEMDETECTING CONDITION
(DTC will set when detecting:)MIL
P0335Crankshaft position sensor
circuit malfunctionNo signal during engine running1 driving cycle
P0340Camshaft position sensor
circuit malfunctionNo signal for 2 sec. during engine cranking1 driving cycle
P0420Catalyst system efficiency
below threshold
Output waveforms of HO2S-1 and HO2S-2
are similar.
(Time from output voltage change of HO2S-1
to that of HO2S-2 is shorter than
specification.)
2 driving cycles
P0443EVAP Purge control valve
circuit malfunctionPurge control valve circuit is open or shorted
to ground2 driving cycles
P0480Radiator fan control circuit
malfunctionRadiator cooling fan relay terminal voltage is
low when cooling temp. is lower than
specification
2 driving cycles
P0500Vehicle speed sensor
malfunctionNo signal while running in “D” range or during
fuel cut at decelerating2 driving cycles
P0505Idle control system malfunction
Throttle opening change is small as compared
with electrically live time. Throttle valve opening
is not within its target range with CTP switch ON
or drive voltage exists though ECM (PCM) is not
outputting ISC drive command.
1 driving cycle
P0510Closed throttle position switch
malfunctionSwitch does not change from ON to OFF
(or from OFF to ON) even when vehicle speed
reaches over (or below) specification.
2 driving cycle
P1250Early Fuel Evaporation Heater
Circuit MalfunctionHeater monitor terminal voltage is higher than
specified value when EFE OFF or it is lower
than specified value when EFE ON.
2 driving cycles
P1450Barometric pressure sensor
circuit malfunctionBarometric pressure is lower or higher than
specification. (or sensor malfunction)1 driving cycle
P1451Barometric pressure sensor
performance problem
Difference between manifold absolute
pressure (MAP sensor value) and
barometric pressure (barometric pressure
sensor value) is larger than specification
during cranking.
2 driving cycles
P1500Starter signal circuit
malfunctionStarter signal is not inputted from engine
cranking till its start and after or it is always
inputted
2 driving cycles
P1510ECM (PCM) backup power
source malfunctionNo backup power after starting engine1 driving cycle

ENGINE GENERAL INFORMATION AND DIAGNOSIS (TBI FOR G10) 6-17
DTC
NO.DETECTING ITEMDETECTING CONDITION
(DTC will set when detecting:)MIL
P0705Transmission range sensor (switch)
circuit malfunction (A / T)No signal or multiple signals inputted with
shifted in “D” range1 driving
cycle
P0720Output speed sensor circuit
malfunction (A / T)No signal while running vehicle with “D” or
“2” range.1 driving
cycle
P0751Shift solenoid A (#1) performance
or stuck offWhile running in “D” range, engine speed as
compared to vehicle speed is higher or2 driving
P0756Shift solenoid B (#2) performance
or stuck offcom ared to vehicle s eed is higher or
lower than specified value.cycles
P0753Shift solenoid A (#1) electrical (A / T)Output command from PCM and output
voltage do not agree (solenoid circuit1 driving
P0758Shift solenoid B (#2) electrical (A / T)
voltage do not agree. (solenoid circuit
shorted to ground or open)cycle
P1620ECU code not registered
P1621No ECU code transmitted from
Immobilizer Control Module
Refer to Section 8A.
P1622Fault in ECM (PCM)
P1623ECU code not matched

6-18 ENGINE GENERAL INFORMATION AND DIAGNOSIS (TBI FOR G10)
FAIL-SAFE TABLE
When any of the following DTCs is detected, ECM (PCM) enters fail-safe mode as long as malfunction continues
to exist but that mode is canceled when ECM (PCM) detects normal condition after that.
DTC NO.
DETECTED ITEMFAIL-SAFE OPERATION
P0105Manifold absolute pressure circuit
malfunction
ECM (PCM) uses value determined by throttle
opening and engine speed.

ECM (PCM) stops EVAP purge control.
P0110Intake air temp. circuit malfunctionECM (PCM) controls actuators assuming that
intake air temperature is 20C (68F).
P0115Engine coolant temp. circuit malfunction

ECM (PCM) controls actuators assuming that
engine coolant temperature is 80C (176F).

ECM (PCM) operates radiator fan.

ECM (PCM) stops A / C and idle speed control.
P0120Throttle position circuit malfunction

ECM (PCM) controls actuators assuming that
throttle opening is 20.

ECM (PCM) stops idle speed control.
P0500Vehicle speed sensor malfunctionECM (PCM) stops idle air control.
P1450Barometric pressure sensor low /
high inputECM (PCM) controls actuators assuming that
barometric pressure is 100 kPa (760 mmHg).

6-20 ENGINE GENERAL INFORMATION AND DIAGNOSIS (TBI FOR G10)
ENGINE BASIC INSPECTION
This check is very important for troubleshooting when ECM (PCM) has detected no DTC and no abnormality has
been found in visual inspection.
Follow the flow table carefully.
STEP
ACTIONYESNO
1Was “ENGINE DIAG. FLOW TABLE” performed?Go to Step 2.Go to “ENGINE DIAG.
FLOW TABLE”.
2Check battery voltage.
Is it 11 V or more?Go to Step 3.Charge or replace
battery.
3Is engine cranked?Go to Step 4.Go to “DIAGNOSIS”
in Section 6G.
4Does engine start?Go to Step 5.Go to Step 7.
5Check idle speed as follows.
1) Warm up engine to normal operating temp.
2) Shift transmission to neutral position for M / T
(“P” position for A / T).
3) All of electrical loads are switched off.
4) Check engine idle speed with scan tool.
See Fig. 1.
Is it 800 – 900 r / min.?Go to Step 6.Go to “ENGINE
DIAGNOSIS TABLE”.
6Check ignition timing as follows.
1) Select “MISC” mode on SUZUKI scan tool and
fix ignition timing to initial one. See Fig. 2.
2) Using timing light (1), check initial ignition timing.
See Fig. 3.
Is it 5 ± 3 BTDC at specified idle speed?Go to “ENGINE
DIAGNOSIS TABLE”.Check ignition control
related parts referring
to Section 6F.
7Check immobilizer system malfunction as follows.
1) Check immobilizer indicator lamp for flashing.
Is it flashing when ignition switch is turned to ON
position?Go to “DIAGNOSIS” in
Section 8A.Go to Step 8.
8Check fuel supply as follows.
1) Check to make sure that enough fuel is filled in fuel
tank.
2) Turn ON ignition switch for 2 seconds and then
OFF. See Fig. 4.
Is fuel return pressure (returning sounds) felt from fuel
feed hose (1) when ignition switch is turned ON?Go to Step 10.Go to Step 9.
9Check fuel pump for operating.
1) Was fuel pump operating sound heard from fuel
filler for about 2 seconds after ignition switch ON
and stop?Go to “DIAG. FLOW
TABLE B-3”.Go to “DIAG. FLOW
TABLE B-2”.
10Check ignition spark as follows.
1) Disconnect injector coupler.
2) Remove spark plugs and connect them to high
tension cords.
3) Ground spark plugs.
4) Crank engine and check if each spark plug sparks.
Is it in good condition?Go to Step 11.Go to “DIAGNOSIS”
in Section 6F.
11Check fuel injector for operation as follows.
1) Install spark plugs and connect injector
connectors.
2) Check that fuel is injected out in conical shape
from fuel injector when cranking.
Is it in good condition?Go to “ENGINE
DIAGNOSIS TABLE”.Go to “DIAG. FLOW
TABLE B-1”.

6-22 ENGINE GENERAL INFORMATION AND DIAGNOSIS (TBI FOR G10)
ENGINE DIAGNOSIS TABLE
Perform troubleshooting referring to following table when ECM (PCM) has detected no DTC and no abnormality
has been found in visual inspection and engine basic inspection previously.
Condition
Possible CauseReferring Item
Hard Starting
(Engine cranks OK)Ignition system out of order

Faulty spark plug

Leaky high-tension cord

Loose connection or disconnection of high-
tension cords or lead wires

Faulty ignition coil
Fuel system out of order

Dirty or clogged fuel hose or pipe

Malfunctioning fuel pump

Air inhaling from intake manifold gasket or
throttle body gasket

Fuel injector resistor malfunction
Engine and emission control system out of
order

Faulty idle control system

Faulty ECT sensor or MAP sensor

Faulty ECM (PCM)
Low compression

Poor spark plug tightening or faulty gasket

Compression leak from valve seat

Sticky valve stem

Weak or damaged valve springs

Compression leak at cylinder head gasket

Sticking or damaged piston ring

Worn piston, ring or cylinder
Others

Malfunctioning PCV valve
Spark plugs in Section 6F
High-tension cords in Section 6F
High-tension cords in Section 6F
Ignition coil in Section 6F
Diagnostic Flow Table B-3
Diagnostic Flow Table B-3
Fuel injector resistor in Section 6E1
Diagnostic Flow Table P0505
ECT sensor or MAP sensor in
Section 6E1
Compression check in Section
6A
Spark plugs in Section 6F
Valves inspection in Section 6A
Valves inspection in Section 6A
Valve springs inspection in
Section 6A
Cylinder head inspection in
Section 6A
Cylinders, pistons and piston rings
inspection in Section 6A
Cylinders, pistons and piston rings
inspection in Section 6A
PCV system in Section 6E1

6-24 ENGINE GENERAL INFORMATION AND DIAGNOSIS (TBI FOR G10)
ConditionPossible CauseReferring Item
Overheating
Inoperative thermostat

Poor water pump performance

Clogged or leaky radiator

Improper engine oil grade

Clogged oil filter or oil strainer

Poor oil pump performance

Faulty radiator fan control system

Dragging brakes

Slipping clutch

Blown cylinder head gasketThermostat in Section 6B
Water pump in Section 6B
Radiator in Section 6B
Engine oil and oil filter change in
Section 0B
Oil pressure check in Section 6A
Oil pressure check in Section 6A
Radiator fan control system in
Section 6E1
Trouble diagnosis in Section 5
Trouble diagnosis in Section 7C
Cylinder head in Section 6A
Poor gasoline
mileageIgnition system out of order

Leaks or loose connection of high-tension cord

Faulty spark plug (improper gap, heavy deposits
and burned electrodes, etc.)
Engine and emission control system out of
order

High idle speed

Poor performance of TP sensor, ECT sensor or
MAP sensor

Faulty fuel injector

Faulty fuel injector resistor

Faulty ECM (PCM)
Low compression
Others

Poor valve seating

Dragging brakes

Slipping clutch

Thermostat out of order

Improper tire pressure
High-tension cords in Section 6F
Spark plugs in Section 6F
Refer to item “Improper engine
idle speed” previously outlined
TP sensor, ECT sensor or MAP
sensor in Section 6E1
Diagnostic Flow Table B-1
Fuel injector resistor in Section 6E1
Previously outlined
Valves inspection in Section 6A
Trouble diagnosis in Section 5
Trouble diagnosis in Section 7C
Thermostat in Section 6B
Refer to Section 3F
Excessive engine
oil consumptionOil leakage

Blown cylinder head gasket

Leaky camshaft oil seals
Oil entering combustion chamber

Sticky piston ring

Worn piston and cylinder

Worn piston ring groove and ring

Improper location of piston ring gap

Worn or damaged valve stem seal

Worn valve stem
Cylinder head in Section 6A
Camshaft in Section 6A
Piston cleaning in Section 6A
Pistons and cylinders inspection
in Section 6A
Pistons inspection in Section 6A
Pistons assembly in Section 6A
Valves removal and installation in
Section 6A
Valves inspection in Section 6A

ENGINE GENERAL INFORMATION AND DIAGNOSIS (TBI FOR G10) 6-25
ConditionPossible CauseReferring Item
Engine hesitates
(Momentary lack of
response as
accelerator is
depressed.
Can occur at all
vehicle speeds.
Usually most severe
when first trying to
make vehicle move,
as from a stop sign.)Ignition system out of order

Spark plug faulty or plug gap out of adjustment

Leaky high-tension cord
Fuel system out of order

Fuel pressure out of specification
Engine and emission control system out of
order

Poor performance of TP sensor, ECT sensor or
MAP sensor

Faulty fuel injector

Faulty ECM (PCM)
Engine overheating
Low compression
Spark plugs in Section 6F
High-tension cords in Section 6F
Diagnostic Flow Table B-3
Trouble diagnosis in Section 6
TP sensor, ECT sensor or MAP
sensor in Section 6E1
Diagnostic Flow Table B-1
Refer to “Overheating” section
Previously outlined
Surge
(Engine power
variation under
steady throttle or
cruise.
Feels like vehicle
speeds up and down
with no change in
accelerator pedal.)Ignition system out of order

Leaky or loosely connected high-tension cord

Faulty spark plug (excess carbon deposits,
improper gap, and burned electrodes, etc.)
Fuel system out of order

Variable fuel pressure

Kinky or damaged fuel hose and lines

Faulty fuel pump (clogged fuel filter)
Engine and emission control system out of
order

Poor performance of MAP sensor

Faulty fuel injector

Faulty ECM (PCM)
High-tension cords in Section 6F
Spark plugs in Section 6F
Diagnostic Flow Table B-3
MAP sensor in Section 6E1
Diagnostic Flow Table B-1
Excessive
detonation
(Engine makes
continuously
sharp metallic
knocks that change
with throttle opening.
Sounds like pop corn
popping.)Engine overheating
Ignition system out of order

Faulty spark plug

Loose connection of high-tension cord
Fuel system out of order

Clogged fuel filter (faulty fuel pump) or fuel lines

Air inhaling from intake manifold or throttle body
gasket
Engine and emission control system out of
order

Poor performance of ECT sensor or MAP sensor

Faulty fuel injector

Faulty ECM (PCM)

Excessive combustion chamber depositsRefer to “Overheating” section
Spark plugs in Section 6F
High-tension cords in Section 6F
Diagnostic Flow Table B-1 or B-2
Trouble diagnosis in Section 6
ECT sensor or MAP sensor in
Section 6E1
Diagnostic Flow Table B-1
Piston and cylinder head cleaning
in Section 6A

6-26 ENGINE GENERAL INFORMATION AND DIAGNOSIS (TBI FOR G10)
ConditionPossible CauseReferring Item
Engine has no
powerIgnition system out of order

Faulty spark plug

Faulty ignition coil with ignitor

Leaks, loose connection or disconnection of
high-tension cord
Engine overheating
Fuel system out of order

Clogged fuel hose or pipe

Malfunctioning fuel pump

Air inhaling from intake manifold gasket or
throttle body gasket
Engine and emission control system out of
order

Maladjusted accelerator cable play

Poor performance of TP sensor, ECT sensor or
MAP sensor

Faulty fuel injector

Faulty ECM (PCM)
Low compression
Others

Dragging brakes

Slipping clutch
Spark plugs in Section 6F
Ignition coil in Section 6F
High-tension cords in Section 6F
Refer to “Overheating” section
Diagnostic Flow Table B-3 in
Section 6
Diagnostic Flow Table B-2
Accelerator cable play in Section
6E1
TP sensor, ECT sensor or MAP
sensor in Section 6E1
Diagnostic Flow Table B-1
Previously outlined
Trouble diagnosis in Section 5
Trouble diagnosis in Section 7C

ENGINE GENERAL INFORMATION AND DIAGNOSIS (TBI FOR G10) 6-27
ConditionPossible CauseReferring Item
Improper engine
idling or engine
fails to idleIgnition system out of order

Faulty spark plug

Leaky or disconnected high-tension cord

Faulty ignition coil with ignitor
Fuel system out of order

Fuel pressure out of specification

Leaky manifold, throttle body, or cylinder head
gasket
Engine and emission control system out of
order

Faulty idle control system

Faulty evaporative emission control system

Faulty fuel injector

Faulty fuel injector resistor

Poor performance of ECT sensor, TP sensor or
MAP sensor

Faulty ECM (PCM)
Engine overheating
Low compression
Others

Loose connection or disconnection of vacuum
hoses

Malfunctioning PCV valve
Spark plugs in Section 6F
High-tension cords in Section 6F
Ignition coil in Section 6F
Diagnostic Flow Table B-3 in
Section 6
Diagnostic Flow Table P0505
EVAP control system in Section
6E
Diagnostic Flow Table B-1
Fuel injector resistor in Section 6E1
ECT sensor, TP sensor or MAP
sensor in Section 6E1
Refer to “Overheating” section
Previously outlined
PCV system in Section 6E1