2000 SUZUKI SWIFT 6 F

ENGINE GENERAL INFORMATION AND DIAGNOSIS (SFI FOR G13) 6-1-77
GND Vout
B+
Magnetic substance (iron)
Mirror
STEPACTIONYESNO
7Check signal rotor for the following, using mirror.
See Fig. 4.

Damage

No foreign material attached
Is it in good condition?Intermittent trouble or
faulty ECM (PCM).
Check for intermittent
referring to
“Intermittent and
Poor Connection” in
Section 0A.Clean rotor teeth or
replace CMP sensor.
Fig. 1 for Step 3 Fig. 2 for Step 4 Fig. 3 for Step 6
Fig. 4 for Step 7

6-1-78 ENGINE GENERAL INFORMATION AND DIAGNOSIS (SFI FOR G13)
Ignition
switch
Main fuseRelay
boxMain
relay
EGR valve
2 C13
DTC P0400 EXHAUST GAS RECIRCULATION FLOW MALFUNCTION
CIRCUIT DESCRIPTION
DTC DETECTING CONDITIONPOSSIBLE CAUSE

While running at specified vehicle speed after
engine warm-up

During deceleration (engine speed high with closed
throttle position ON) in which fuel cut is involved,
difference in intake manifold absolute pressure
between when EGR valve is opened at specified
value and when it is closed is larger or smaller than
specified value.
2 driving cycle detection logic, monitoring once / 1
driving
EGR valve or its circuit

EGR passage

ECM (PCM)

ENGINE GENERAL INFORMATION AND DIAGNOSIS (SFI FOR G13) 6-1-79
1) 2) 3)4)
5) 6)7)
Engine speed
4000 r/min
0 Vehicle speed
0 50 – 55 mph
80 – 88 km/h
(Keep throttle
valve opening
constantly)
DTC CONFIRMATION PROCEDURE
WARNING:

When performing a road test, select a place where there is no traffic or possibility of a traffic accident
and be very careful during testing to avoid occurrence of an accident.

Road test should be carried out with 2 persons, a driver and a tester, on a level road.
1) Turn ignition switch OFF.
Clear DTC with ignition switch ON, check vehicle and environmental condition for:
–Altitude (barometric pressure): 2400 m, 8000 ft or less (560 mmHg, 75 kPa or more)
–Intake air temp.: between –10C and 80C (14F and 158F)
2) Start engine and warm it up to normal operating temperature (70 – 11 0C, 158 – 230F) and run it at idle for
5 min.
3) Increase vehicle speed to 50 – 55 mph, 80 – 88 km / h in 5th gear or in “D” range.
4) Hold throttle valve at that opening position for 2 min. or longer.
5) Increase engine speed to 4000 r / min. in 3rd gear or in “2” range.
6) Release accelerator pedal and with engine brake applied, keep vehicle coasting (fuel cut condition) till engine
speed reaches 1500 r / min.
7) Stop vehicle (don’t turn ignition switch OFF) and confirm test results according to following “Test Result Con-
firmation Flow Table.”
Test Result Confirmation Flow Table
STEPACTIONYESNO
1Check DTC in “DTC” mode and pending DTC in “ON
BOARD TEST”.
Is DTC or pending DTC displayed?Proceed to applicable
DTC flow table.Go to Step 2.
2Set scan tool to “READINESS TESTS” mode and
check if testing has been completed.
Is test completed?No DTC is detected.
(Confirmation test is
completed)Repeat DTC
confirmation
procedure.

6-1-80 ENGINE GENERAL INFORMATION AND DIAGNOSIS (SFI FOR G13)
1. EGR valve coupler
INSPECTION
STEPACTIONYESNO
1Was ENGINE DIAG. FLOW TABLE performed?Go to Step 2.Go to ENGINE
DIAG. FLOW
TABLE.
2Do you have SUZUKI scan tool?Go to Step 3.Go to Step 5.
3EGR Valve Operation Check
1) With ignition switch OFF, install SUZUKI scan tool.
2) Check EGR system referring to section 6E2.
Is it in good condition?Go to Step 4.Go to Step 5.
4MAP Sensor Check
1) Check MAP sensor for performance referring to “MAP
Sensor Check” in DTC P0105 Diag. Flow Table.
Is check result satisfactory?Intermittent trouble
or faulty ECM
(PCM) Check for in-
termittent referring
to “Intermittent and
Poor Connection” in
section 0A.Repair or replace.
5EGR Valve Power Supply Circuit Check
1) With ignition switch OFF, disconnect EGR valve
coupler.
2) With ignition switch ON, check voltage between C13-2
and ground, C13-5 and ground. See Fig. 1.
Is each voltage 10 – 14 V?Go to Step 6.“R/B” wire.
6EGR Valve Stepping Motor Coil Circuit Check
1) With ignition switch OFF, connect EGR valve coupler
and disconnect ECM (PCM) couplers.
2) Check resistance between C02-6 and C02-2, C02-8,
C02-9, C02-17.
Is each resistance 20 – 24 Ω at 20C, 68F?Go to Step 7.Faulty “R/Y”,
“R/Bl”, “R”, “R/W”
wire or EGR valve.
7MAP Sensor Check
1) Check MAP sensor for performance referring to
“MAP Sensor Check” in DTC P0105 Diag. Flow Table.
Is check result satisfactory?EGR passage
clogged or EGR
valve malfunction.
If all above are OK,
intermittent trouble
or faulty ECM.
Check for intermit-
tent referring to
“Intermittent and
Poor Connection” in
section 0A.Repair or replace.
Fig. 1 for step 5

ENGINE GENERAL INFORMATION AND DIAGNOSIS (SFI FOR G13) 6-1-81
Oscilloscope WaveformsHeated
oxygen
sensor-1To other sensor
Heated oxygen
sensor-2
Warm up three way
catalytic converterThree way catalytic converter
Engine running at
Closed loop conditionFuel
CutIdle after fuel cut 0.5 V / Div
2 sec. / Div
DTC P0420 CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD
CIRCUIT DESCRIPTION
ECM (PCM) monitors oxygen concentration in the exhaust gas which has passed the three way catalytic converter
by HO2S-2.
When the catalyst is functioning properly, the variation cycle of HO2S-2 output voltage (oxygen concentration) is
slower than that of HO2S-1 output voltage because of the amount of oxygen in the exhaust gas which has been
stored in the catalyst.
Reference
DTC DETECTING CONDITIONPOSSIBLE CAUSE

While vehicle running at constant speed under other
than high load.

Time from rich or lean switching command is output
till HO2S-2 output voltage crosses 0.45 V is less than
specified value.
2 driving cycle detection logic, monitoring once / 1
driving.
Exhaust gas leak

Three way catalytic converter malfunction

Fuel system malfunction

HO2S-2 malfunction

HO2S-1 malfunction

6-1-82 ENGINE GENERAL INFORMATION AND DIAGNOSIS (SFI FOR G13)
1) 2) 3) 4) 41 – 46 mph
(65 – 75 km / h)
28 – 34 mph
(45 – 55 km / h)
DTC CONFIRMATION PROCEDURE
WARNING:

When performing a road test, select a place where there is no traffic or possibility of a traffic accident
and be very careful during testing to avoid occurrence of an accident.

Road test should be carried out with 2 persons, a driver and tester, on a level road.
1) Turn ignition switch OFF.
Clear DTC with ignition switch ON, check vehicle and environmental condition for:
–Altitude (barometric pressure): 2400 m, 8000 ft or less (560 mmHg, 75 kPa or more)
–Intake air temp.: between –10C and 80C (14F and 158F)
–Engine coolant temp.: 70C, 230F or higher
2) Start engine and drive vehicle at 41 – 46 mph, 65 – 75 km / h for 8 min. or longer.
While this driving, if “Catalyst Monitoring TEST COMPLETED” is displayed in “READINESS TESTS” mode and
DTC is not displayed in “DTC” mode, confirmation test is completed.
If “TEST NOT COMPLTD” is still being displayed, continue test driving.
3) Decrease vehicle speed at 28 – 34 mph, 45 – 55 km / h, and hold throttle valve at that opening position for 2 min.
and confirm that short term fuel trim vary within –20% –+20% range.
4) Stop vehicle (do not turn ignition switch OFF) and confirm test results according to following “Test Result Con-
firmation Flow Table”.
Test Result Confirmation Flow Table
STEPACTIONYESNO
1Check DTC in “DTC” mode and pending DTC in
“ON BOARD TEST” or “PENDING DTC” mode.
Is DTC or pending DTC displayed?Proceed to applicable
DTC Diag. Flow Table.Go to Step 2.
2Set scan tool to “READINESS TESTS” mode and
check if testing has been completed.
Is test completed?No DTC is detected
(confirmation test is
completed).Repeat DTC
confirmation
procedure.

ENGINE GENERAL INFORMATION AND DIAGNOSIS (SFI FOR G13) 6-1-83
INSPECTION
STEPACTIONYESNO
1Was “ENGINE DIAG. FLOW TABLE” performed?Go to Step 2.Go to “ENGINE DIAG.
FLOW TABLE”.
2Check Short Term Fuel Trim.
Did short term fuel trim vary within –20% –+20%
range in step 3) of DTC confirmation test?Go to Step 3.Check fuel system.
Go to DTC P0171 / P0172
Diag. Flow Table.
3Check HO2S-2 for Output Voltage.
Perform steps 1) through 9) of DTC confirmation
procedure for DTC P0136 (HO2S-2 malfunction)
and check output voltage of HO2S-2 then.
Is over 0.6 V and below 0.3 V indicated?Replace three way
catalytic converter.Check “R” and “G” wires
for open and short, and
connections for poor
connection.
If wires and connections
are OK, replace
HO2S-2.

6-1-84 ENGINE GENERAL INFORMATION AND DIAGNOSIS (SFI FOR G13)
1. EVAP canister purge valve
2. To main relay
3. ECM (PCM)
4. Sensed information
5. Intake manifold
6. EVAP canister
7. Tank pressure control valve
8. Fuel vapor line
9. Fuel tank
Fig. 1 for Step 1
DTC P0443 EVAP PURGE CONTROL VALVE CIRCUIT MALFUNCTION
CIRCUIT DESCRIPTION
DTC DETECTING CONDITIONPOSSIBLE CAUSE
Canister Purge control valve circuit is opened
or shorted.
“V/R” circuit open or short

“R/B” circuit open

Canister purge valve malfunction
DTC CONFIRMATION PROCEDURE
1) Clear DTC with ignition switch ON.
2) Select “DTC” mode on scan tool and check DTC.
INSPECTION
STEPACTIONYESNO
1Check EVAP canister purge valve operation
1) With ignition switch OFF, disconnect coupler
from canister purge valve.
2) Check resistance of EVAP canister purge
valve.
Resistance between
two terminals : 30 – 34 Ω at 20C (68F)
Resistance between
terminal and body : 1M Ω or higher
Is it as specified?“V/R” circuit open or
short.Replace EVAP canister
purge valve.