2000 SUZUKI SWIFT radiator fan

ENGINE GENERAL INFORMATION AND DIAGNOSIS 6-21
P0340
(No.15)CMP SENSOR ECM changes injection control sys-
tem from sequential injection to simul-
taneous one.Hard starting
P0400 EGR VALVE–Hard starting/rough or incorrect
idle/ excessive fuel consumption/
hesitation/ poor acceleration/
surge/ detonation or spark knock/
engine stall
P0420 CATALYST––
P0443 PURGE CONTROL
VALVE–Rough or incorrect idle/ surge/
hard starting/ engine stall
P0480 RADIATOR FAN
CONTROL SYSTEM–Engine overheating
P0500
(No.16)VEHICLE SPEED
SENSORECM stops idle air control. Rough or incorrect idle
P0505 IDLE CONTROL
SYSTEM–Engine stall/ rough or incorrect idle
P0601
(No.71)ECM INTERNAL–Hard starting/ rough or incorrect
idle/ excessive fuel consumption/
detonation or spark knock/ hesita-
tion poor acceleration/
P1450
(No.29)BAROMETRIC
PRESSURE SEN-
SORECM controls actuators assuming
that barometric pressure is
100 kPa (760 mmHg).Hard starting/ rough or incorrect
idle DTC NO. TROUBLE AREA FAIL-SAFE OPERATION SYMPTOM

ENGINE GENERAL INFORMATION AND DIAGNOSIS 6-27
Engine noise
Note : Before
checking mechani-
cal noise, make sure
that :
Specified spark
plug is used.
Specified fuel is
used.Improper valve lash Valve lash in Section 6A1.
Worn valve stem and guide Valves inspection in Section 6A1.
Weak or broken valve spring Valve springs inspection in Section
6A1.
Warped or bent valve Valves inspection in Section 6A1.
Worn piston, ring and cylinder bore Pistons and cylinders inspection in Sec-
tion 6A1.
Worn rod bearing Crank pin and connecting rod bearing
inspection in Section 6A1.
Worn crank pin Crank pin and connecting rod bearing
inspection in Section 6A1.
Loose connecting rod nuts Connecting rod installation in Section
6A1.
Low oil pressure Previously outlined.
Low oil pressure Previously outlined.
Worn bearing Crankshaft and bearing inspection in
Section 6A1.
Worn crankshaft journal Crankshaft and bearing inspection in
Section 6A1.
Loose bearing cap bolts Crankshaft inspection in Section 6A1.
Excessive crankshaft thrust play Crankshaft thrust play inspection in
Section 6A1.
Overheating
Inoperative thermostat Thermostat in Section 6B.
Poor water pump performance Water pump in Section 6B.
Clogged or leaky radiator Radiator in Section 6B.
Improper engine oil grade Engine oil and oil filter change in Sec-
tion 0B.
Clogged oil filter or oil strainer Oil pressure check in Section 6A1.
Poor oil pump performance Oil pressure check in Section 6A1.
Faulty radiator fan control system Radiator fan control system in Section
6E1.
Dragging brakes Trouble diagnosis in Section 5.
Slipping clutch Trouble diagnosis in Section 7C.
Blown cylinder head gasket Cylinder head in Section 6A1. Condition Possible Cause Correction

6-32 ENGINE GENERAL INFORMATION AND DIAGNOSIS
✱THROTTLE POS
(ABSOLUTE THROTTLE
POSITION)Ignition switch
ON/engine
stoppedThrottle valve fully closed 7 – 18%
Throttle valve fully open 70 – 90%
✱O2S B1 S1
(HEATED OXYGEN SEN-
SOR-1)At specified idle speed after warming up 0.01 – 0.95 V
∆✱O2S B1 S2
(HEATED OXYGEN SEN-
SOR-2)When engine is running at 2000 r/min. for 3
min or longer after warming up.0.01 – 0.95 V
∆✱O2S FT B1 S1 At specified idle speed after warning up– 20 – +20%
∆✱DIS. WITH MIL ON––
DESIRED IDLE
(DESIRED IDLE SPEED)At idling with no load after warming up, M/T
at neutral, A/T at “P” rangeM/T 700 r/min
A/T 750 r/min
TP SENSOR VOLT
(THROTTLE POSITION
SENSOR OUTPUT VOLT-
AGE)Ignition switch
ON/engine
stoppedThrottle valve fully closed More than 0.2 V
Throttle valve fully open Less than 4.8 V
INJ PULSE WIDTH
(FUEL INJECTION PULSE
WIDTH)At specified idle speed with no load after
warming up2.0 – 3.6 msec.
At 2500 r/min with no load after warming up 2.0 – 3.6 msec.
IAC FLOW DUTY
(IDLE AIR CONTROL
FLOW DUTY)At idling with no load after warming up 5 – 25%
TOTAL FUEL TRIM At specified idle speed after warming up– 35 – +35%
BATTERY VOLTAGE Ignition switch ON/engine stop 12 – 14 V
CANIST PRG DUTY
(EVAP CANISTER PURGE
FLOW DUTY)–0 – 100%
CLOSED THROT POS
(CLOSED THROTTLE
POSITION)Throttle valve at idle position ON
Throttle valve opens larger than idle posi-
tionOFF
FUEL CUT When engine is at fuel cut condition ON
Other than fuel cut condition OFF
RADIATOR FAN
(RADIATOR FAN CON-
TROL RELAY)Ignition switch
ONEngine coolant temp. :
Lower than 95°C (203°F)OFF
Engine coolant temp. :
97.5°C (208°F) or higherON
ELECTRIC LOAD Ignition switch ON/Headlight, small light
and rear window defogger all turned OFFOFF
Ignition switch ON/Headlight, small light or
rear window defogger turned ONON
A/C SWITCH Engine running after warming up, A/C not
operatingOFF
Engine running after warming up, A/C oper-
atingON SCAN TOOL DATA VEHICLE CONDITION NORMAL CONDITION/
REFERENCE VALUES

ENGINE GENERAL INFORMATION AND DIAGNOSIS 6-35
RADIATOR FAN (RADIATOR FAN CONTROL RELAY, ON/OFF)
ON : Command for radiator fan control relay operation being output.
OFF : Command for relay operation not being output.
ELECTRIC LOAD (ON/OFF)
ON : Headlight, small light or rear window defogger ON signal inputted.
OFF : Above electric loads all turned OFF.
A/C SWITCH (ON/OFF)
ON : Command for A/C operation being output from ECM to A/C compressor magnet clutch.
OFF : Command for A/C operation not being output.
FUEL TANK LEVEL (%)
This parameter indicates approximate fuel level in the fuel tank. As the detectable range of the fuel level sensor
is set as 0 to 100%, however, with some models whose fuel tank capacity is smaller, the indicated fuel level may
be only 70% even when the fuel tank is full.
PNP SIGNAL (PARK/NEUTRAL POSITION SIGNAL, P/N RANGE or D RANGE)
It is detected by signal from TCM.
D range : A/T is in “R”, “D”, “2” or “L” range.
P/N range : A/T is in “P” or “N” range or the above signal is not inputted from TCM.
EGR VALVE (%)
This parameter indicates opening rate of EGR valve which controls the amount of EGR flow.

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

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

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