Throttle SUZUKI SX4 2006 1.G Service Repair Manual

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DTC Detecting Condition and Trouble Area
DTC Confirmation Procedure
1) With ignition switch turned OFF, connect scan tool.
2) Turn ON ignition switch and clear DTC using scan tool.
3) Keep the accelerator pedal at idle position for 2 seconds.
4) Keep the accelerator pedal at fully depressed position for 2 seconds.
5) Repeat Step 3) and 4) for 3 times.
6) Check DTC.
DTC Troubleshooting
NOTE
Before this troubleshooting is performed, read the precautions for DTC troubleshooting referring to
“Precautions for DTC Troubleshooting”.

DTC detecting condition Trouble area
Difference between the opening angle based on throttle position
sensor (main) and the opening angle based on throttle position
sensor (sub) is more than specification for specified time.
(1 driving detection logic)• Throttle position sensor (main) and (sub) circuit
• Electric throttle body assembly
•ECM
Step Action Yes No
1Was “Engine and Emission Control System Check”
performed?Go to Step 2. Go to “Engine and
Emission Control
System Check”.
2Throttle position sensor and its circuit check
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Turn ON ignition switch, check each voltage of “TP
Sensor 1 Volt” and “TP Sensor 2 Volt” displayed on scan
tool when accelerator pedal is idle position and fully
depressed.
Is each TP sensor voltage within specified value in the table
“Scan Tool Data”?Intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection in Section
00”.Go to Step 3.
3ECM voltage check
1) Disconnect connector from electric throttle body
assembly with ignition switch turned OFF.
2) Check for proper connection to electric throttle body
assembly at “RED”, “GRN”, “WHT” and “BLK” wire
terminals.
3) If OK, measure voltage between “RED” wire terminal of
electric throttle body assembly connector and engine
ground with ignition switch turned ON.
Is voltage 4 – 6 V?Go to Step 6. Go to Step 4.
“WHT”
“YEL”“RED”
“GRN” “BLU”“BLK”
I5RW0C110016-01

Downloaded from www.Manualslib.com manuals search engine 1A-162 Engine General Information and Diagnosis:
4Wire harness check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Measure resistance between “C01-43” terminal of ECM
connector and engine ground.
Is resistance infinity?Go to Step 5. “RED” wire is shorted to
other circuit.
5Wire harness check
1) Measure voltage between “C01-43” terminal of ECM
connector and engine ground with ignition switch turned
ON.
Is voltage 0 V?Substitute a known-
good ECM and recheck.“RED” wire is shorted to
other circuit.
6Wire harness check
1) Measure voltage between “GRN” wire terminal of electric
throttle body assembly connector and engine ground,
between “WHT” wire terminal of electric throttle body
assembly connector and engine ground with ignition
switch turned ON.
Is each voltage 4 – 6 V?Go to Step 9. Go to Step 7.
7Wire harness check
1) Turn OFF ignition switch.
2) Disconnect connectors from ECM.
3) Check for proper connection of ECM connector at “C01-
54” and “C01-40” terminals.
4) If OK, measure voltage between “C01-54” terminal of
ECM connector and engine ground, between “C01-40”
terminal of ECM connector and engine ground.
Is each voltage 0 V?Go to Step 8. “GRN” wire or “WHT”
wire is shorted to other
circuit.
8Wire harness check
1) Measure resistance between “GRN” wire terminal of
electric throttle body assembly connector and engine
ground, between “WHT” wire terminal of electric throttle
body assembly connector and engine ground with
ignition switch turned OFF.
Is each resistance infinity?Substitute a known-
good ECM and recheck.“GRN” wire or “WHT”
wire is shorted to other
circuit.
9Electric throttle body assembly check
1) Check throttle position sensor referring to “Throttle
Position Sensor Performance Check” under “Electric
Throttle Body Assembly On-Vehicle Inspection in
Section 1C”.
Is each output voltage within specified value?Substitute a known-
good ECM and recheck.Replace electric throttle
body assembly. Step Action Yes No

Downloaded from www.Manualslib.com manuals search engine 1A-176 Engine General Information and Diagnosis:
C01-34 — — — — —
C01-35 — — — — —
C01-36 — — — — —
C01-37 — — — — —
C01-38 — — — — —
C01-39 — — — — —
C01-40 WHTThrottle position
sensor (sub) signal1.57 – 1.90 VIgnition switch turned ON
and accelerator pedal at
idle position after warmed
up engine.
—
3.88 – 4.45 V
(“Reference
waveform No.29: ”)Ignition switch turned ON
and accelerator pedal at
full depressed position
after warmed up engine.
C01-41 GRYGround for shield
wire of TP sensor
circuitBelow 0.3 V Ignition switch turned ON. —
C01-42 BLKGround for throttle
position sensorBelow 0.3 V Ignition switch turned ON. —
C01-43 REDOutput for 5 V
power source of
throttle position
sensor4.5 – 5.5 V Ignition switch turned ON. —
C01-44 YELOutput of throttle
actuator0 – 1 VIgnition switch turned ON
and accelerator pedal at
idle position after warmed
up engine. Output signal is pulse.
Duty ratio varies
depending on throttle
valve and accelerator
pedal position. *0 – 1 V
↑↓
10 – 14 V
(“Reference
waveform No.26: ”
and “Reference
waveform No.27: ”)Ignition switch turned ON
and accelerator pedal at
full depressed position
after warmed up engine.
C01-45 BLUOutput of throttle
actuator0 – 1 VIgnition switch turned ON
and accelerator pedal at
full depressed position
after warmed up engine. Output signal is pulse.
Duty ratio varies
depending on throttle
valve and accelerator
pedal position. *0 – 1 V
↑↓
10 – 14 V
(“Reference
waveform No.26: ”
and “Reference
waveform No.27: ”)Ignition switch turned ON
and accelerator pedal at
idle position after warmed
up engine.
C01-46BLK/
REDHeater output of
heated oxygen
sensor-110 – 14 V Ignition switch turned ON. —
*0 – 2 V
↑↓
10 – 14 V
(“Reference
waveform No.8: ” and
“Reference waveform
No.9: ”)Engine running at idle
after warmed up engine.Output signal is active low
duty pulse. Duty ratio
varies depending on
engine condition.
C01-47RED/
BLUHeater output of
heated oxygen
sensor-2 (if
equipped)10 – 14 V Ignition switch turned ON.
— 0 – 1 V
(“Reference
waveform No.10: ”)Engine running at idle
after vehicle running over
30 km/h, 19 mph for 5 min. Terminal
No.Wire
colorCircuit Normal voltage Condition Remarks

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C01-48YEL/
GRNStarting motor
signal0 – 1 V Ignition switch turned ON.
—
6 – 14 V While engine cranking.
C01-49 — — — — —
C01-50WHT/
BLUGround of ECM for
shield wireBelow 0.3 V Ignition switch turned ON. —
C01-51 — — — — —
C01-52 — — — — —
C01-53RED/
BLKManifold absolute
pressure (MAP)
sensor signal (if
equipped)Approx. 4 V
(“Reference
waveform No.17: ”)Ignition switch turned ON
with barometric pressure
at 100 kPa, 760 mmHg.
—
0.4 – 2.0 V
(“Reference
waveform No.18: ”)While engine running at
specified idle speed after
warmed up with
barometric pressure at
100 kPa, 760 mmHg.
C01c01-
54GRNThrottle position
sensor (main)
signal0.75 – 1.08 VIgnition switch turned ON
and accelerator pedal at
idle position after warmed
up engine.
—
3.67 – 4.24 V
(“Reference
waveform No.29: ”)Ignition switch turned ON
and accelerator pedal at
full depressed position
after warmed up engine.
C01-55GRY/
BLUGround for sensors Below 0.3 V Ignition switch turned ON. —
C01-56 REDKnock sensor
signal2 – 3 V
(“Reference
waveform No.19: ”
and “Reference
waveform No.20: ”)Ignition switch turned ON.
— Engine running at 4000 r/
min. after warmed up.
C01-57 ORN Ground for sensors Below 0.3 V Ignition switch turned ON. —
C01-58BLK/
ORNGround for ECM Below 0.3 V Ignition switch turned ON. —
C01-59GRN/
WHTOil control valve
ground (for engine
with VVT system)Below 1.3 V Ignition switch turned ON. —
C01-60GRN/
REDOil control valve
output (for engine
with VVT system)*0 – 0.6 V
↑↓
10 – 14 V
(“Reference
waveform No.21: ”
and “Reference
waveform No.22: ”)At the moment of ignition
switch turned ON.Output signal is active
high pulse. Duty ratio
varies depending on
vehicle condition. Terminal
No.Wire
colorCircuit Normal voltage Condition Remarks
Terminal
No.Wire
colorCircuit Normal voltage Condition Remarks
E01-1BLK/
REDMain power supply 10 – 14 V Ignition switch turned ON. —
E01-2WHT/
REDPower source for
ECM internal
memory10 – 14 V Ignition switch turned ON. —
E01-3 REDCAN (high)
communication line
(active high signal)
to ABS control
module*2.5 – 4.5 V
(“Reference
waveform No.23: ”)Ignition switch turned ON
with engine at stop.CAN communication line
signal is pulse. Pulse
signal displayed with a
regular frequency with
varies depending on
engine condition.

Downloaded from www.Manualslib.com manuals search engine Engine General Information and Diagnosis: 1A-179
E01-26RED/
BLUEPS signal10 – 14 V Ignition switch turned ON.
—
0 – 1 VWith engine running at idle
speed, and steering wheel
turned to the right or left as
far as it stops.
E01-27 — — — — —
E01-28YEL/
BLKSerial
communication line
for immobilizer coil
antenna10 – 14 V Ignition switch turned ON. —
E01-29BLK/
WHTIgnition switch
signal0 – 1 V Ignition switch turned OFF.
—
10 – 14 V Ignition switch turned ON.
E01-30 WHTStarting motor
control relay output0 – 1 V Ignition switch turned ON.
—
0 – 1 VIgnition switch is turned to
ST (engine cranking)
position.
E01-31 BLK Ground for ECM Below 0.3 V Ignition switch turned ON. —
E01-32 GRNPower supply of
throttle actuator
drive circuit10 – 14 V Ignition switch turned ON. —
E01-33 — — — — —
E01-34 REDOutput for 5 V
power source of
APP sensor (sub)4.5 – 5.5 V Ignition switch turned ON. —
E01-35 BRNOutput for 5 V
power source of
APP sensor (main)4.5 – 5.5 V Ignition switch turned ON. —
E01-36 YELAPP sensor (sub)
signal0.37 – 0.38 VIgnition switch turned ON
and accelerator pedal at
idle position after warmed
up engine.
—
1.70 – 2.00 V
(“Reference
waveform No.30: ”)Ignition switch turned ON
and accelerator pedal at
full depressed position
after warmed up engine.
E01-37 GRNAPP sensor (main)
signal0.75 – 0.85 VIgnition switch turned ON
and accelerator pedal at
idle position after warmed
up engine.
—
3.46 – 4.24 V
(“Reference
waveform No.30: ”)Ignition switch turned ON
and accelerator pedal at
full depressed position
after warmed up engine.
E01-38 — — — — —
E01-39 — — — — —
E01-40 — — — — —
E01-41 — — — — —
E01-42 — — — — —
E01-43 — — — — —
E01-44 — — — — —
E01-45 BRNThrottle actuator
control relay output0 – 1 V Ignition switch turned ON. — Terminal
No.Wire
colorCircuit Normal voltage Condition Remarks

Downloaded from www.Manualslib.com manuals search engine Engine General Information and Diagnosis: 1A-187
Reference waveform No.15
Mass air flow sensor signal (1) with engine racing
Reference waveform No.16
EVAP canister purge valve signalReference waveform No.17
Manifold absolute pressure sensor signal (1) with
ignition switch turned ON
Reference waveform No.18
Manifold absolute pressure sensor signal (1) with engine
racing Measurement
terminalCH1: “C01-26” to “C01-27”
CH2: “C01-54” to “C01-55”
Oscilloscope
settingCH1: 1 V/DIV, CH2: 1 V/DIV
TIME: 200 ms/DIV
Measurement
condition• After warmed up to normal
operating temperature
• Engine racing
2. Throttle position sensor signal
3. Racing
4. Idle
Measurement
terminalCH1: “C01-29” to “C01-58”
Oscilloscope
settingCH1: 10 V/DIV
TIME: 40 ms/DIV
Measurement
condition• After warmed up to normal
operating temperature
• EVAP canister purge valve setting
at 52% by using “Engine / Active
Test” of scan tool.
1. ON signal 3. One duty cycle
2. OFF signal 4. 10 – 14 V
I4RS0B110066-01
I4RS0B110067-01
Measurement
terminalCH1: “C01-53” to “C01-55”
CH2: “C01-54” to “C01-55”
Oscilloscope
settingCH1: 2 V/DIV, CH2: 1 V/DIV
TIME: 200 ms/DIV
Measurement
condition• After warmed up to normal
operating temperature
• Ignition switch turned ON
2. Throttle position sensor signal
Measurement
terminalCH1: “C01-53” to “C01-55”
CH2: “C01-54” to “C01-55”
Oscilloscope
settingCH1: 2 V/DIV, CH2: 2 V/DIV
TIME: 200 ms/DIV
Measurement
condition• After warmed up to normal
operating temperature
• Engine racing
2. Throttle position sensor signal
3. Racing
4. Idle
I4RS0B110070-01
I4RS0B110071-01

Downloaded from www.Manualslib.com manuals search engine 1A-190 Engine General Information and Diagnosis:
Reference waveform No.25
Ignition pulse (engine revolution) signal (2) with engine
idling
Reference waveform No.26
Throttle actuator output signal with ignition switch turned
ONReference waveform No.27
Throttle actuator output signal with ignition switch turned
ON Measurement
terminalCH1: “C01-20” to “C01-58”
CH2: “E01-4” to “C01-58”
Oscilloscope
settingCH1: 5 V/DIV, CH2: 5 V/DIV
TIME: 10 ms/DIV
Measurement
condition• After warmed up to normal
operating temperature
• Engine at specified idle speed
[A]: For VVT model
[B]: For non-VVT model
1. Cylinder reference signal (CMP reference signal)
3. 360° crank angle
4. 2 to 4 msec.
5. 10 – 14 V
Measurement
terminalCH1: “C01-45” to “C01-58”
CH2: “C01-44” to “C01-58”
Oscilloscope
settingCH1: 5 V/DIV, CH2: 5 V/DIV
TIME: 2 ms/DIV
Measurement
condition• After warmed up to normal
operating temperature
• Ignition switch turned ON and
accelerator pedal at idle position
I4RS0B110078-01
1. Throttle actuator drive signal (“C01-45” terminal)
2. Throttle actuator drive signal (“C01-44” terminal)
3. ON signal
4. OFF signal
5. One duty cycle
Measurement
terminalCH1: “C01-45” to “C01-58”
CH2: “C01-44” to “C01-58”
Oscilloscope
settingCH1: 5 V/DIV, CH2: 5 V/DIV
TIME: 2 ms/DIV
Measurement
condition• After warmed up to normal
operating temperature
• Ignition switch turned ON and
accelerator pedal at full
depressed position
1. Throttle actuator drive signal (“C01-45” terminal)
2. Throttle actuator drive signal (“C01-44” terminal)
3. ON signal
4. OFF signal
5. One duty cycle
I4RS0B110081-02
I4RS0B110082-02

Downloaded from www.Manualslib.com manuals search engine Engine General Information and Diagnosis: 1A-191
Reference waveform No.28
Ignition coil signal and fuel injector signal with engine
crankingReference waveform No.29
Throttle position sensor main (1) and sub (2) signal
Reference waveform No.30
Pedal position sensor main (1) and sub (2) signal Measurement
terminalCH1: “C01-20” to “C01-58”
CH2: “C01-6” to “C01-58”
CH3: “C01-1” to “C01-58”
CH4: “C01-48” to “C01-58”
Oscilloscope
settingCH1: 5 V/DIV, CH2: 5 V/DIV
CH3: 50 V/DIV, CH4: 10 V/DIV
TIME: 200 ms/DIV
Measurement
condition• After warmed up to normal
operating temperature
• Engine at cranking
[A]: For VVT model
[B]: For non-VVT model
1. Cylinder reference signal (CMP reference signal)
2. Ignition coil No.1 and No.4 signal
3. No.1 fuel injector signal
4. Engine start signal
I4RS0B110083-01
Measurement
terminalCH1: “C01-54” to “C01-58”
CH2: “C01-40” to “C01-58”
Oscilloscope
settingCH1: 1 V/DIV, CH2: 1 V/DIV
TIME: 200 ms/DIV
Measurement
condition• After warmed up to normal
operating temperature
• Ignition switch turned ON and
depress accelerator pedal fully
3. Accelerator pedal released
4. Accelerator pedal depressed fully
Measurement
terminalCH1: “E01-37” to “C01-58”
CH2: “E01-36” to “C01-58”
Oscilloscope
settingCH1: 1 V/DIV, CH2: 1 V/DIV
TIME: 100 ms/DIV
Measurement
condition• After warmed up to normal
operating temperature
• Ignition switch turned ON and
depress accelerator pedal fully
3. Accelerator pedal released
4. Accelerator pedal depressed fully
3431
2
I5RW0C110023-01
3431
2
I5RW0C110024-01

Downloaded from www.Manualslib.com manuals search engine 1A-192 Engine General Information and Diagnosis:
Resistance Check
1) Remove ECM from its bracket referring to “Engine Control Module (ECM) Removal and Installation in Section 1C”.
CAUTION!
Never touch terminals of ECM itself or connect voltmeter or ohmmeter (2).

2) Connect special tool to ECM connectors (1) securely.
NOTE
Do not connect the other connector of special tool to ECM.

Special tool
(A): 09933–06320
3) Check resistance between each pair of terminals of special tool connectors (1) as listed in the following table.
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 the following table represents that measured when parts temperature is 20 °C (68 °F).

1
(A)
2
3
I7RW01110032-02
Terminals Circuit Standard resistance Condition
C01-47 to E01-29 Heater of HO2S-2 4 – 15 Ω—
E01-46 to E01-1/16 Radiator cooling fan relay No.1 160 – 240 Ω—
E01-60 to E01-29 Main relay 160 – 240 ΩBattery disconnected and
ignition switch turned ON
E01-15 to E01-29 Fuel pump relay 160 – 240 Ω—
C01-16 to E01-1/16No.3 fuel injector
10.8 – 18.2 Ω—
C01-17 to E01-1/16No.4 fuel injector
C01-4 to E01-1/16EGR valve (stepping motor No.1 coil) (if
equipped)20 – 31 Ω—
C01-29 to E01-1/16 EVAP canister purge valve 28 – 35 Ω—
C01-2 to E01-1/16 No.2 fuel injector 10.8 – 18.2 Ω—
C01-3 to E01-1/16EGR valve (stepping motor No.2 coil) (if
equipped)
20 – 31 Ω— C01-18 to E01-1/16EGR valve (stepping motor No.4 coil) (if
equipped)
C01-19 to E01-1/16EGR valve (stepping motor No.3 coil) (if
equipped)
C01-46 to E01-29 Heater of HO2S-1 2 – 11 Ω—
C01-1 to E01-1/16 No.1 fuel injector 10.8 – 18.2 Ω—
E01-29 to E01-47 A/C compressor relay (if equipped with A/C) 160 – 240 Ω—
E01-58 to E01-1/16A/C condenser cooling fan relay
(if equipped with A/C)160 – 240 Ω—
C01-60 to C01-59 Oil control valve (for engine with VVT system) 6 – 15 Ω—
E01-45 to E01-1/16 Throttle actuator control relay 160 – 240 Ω—

Downloaded from www.Manualslib.com manuals search engine Engine General Information and Diagnosis: 1A-195
6ECM ground circuit check
1) Turn ignition switch to OFF position.
2) Disconnect connectors from ECM.
3) Measure resistance between each “E01-31”, “C01-58”,
“C01-15” and “C01-30” terminals of ECM connector and
body ground.
Is resistance 1
Ω or less?Substitute a known-
good ECM and recheck.“BLK/ORN” or “BLK”
wire is open or high
resistance circuit.
7Main relay circuit check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Using service wire, ground “E01-60” terminal of ECM
connector and measure voltage between each “E01-1”
and “E01-16” terminals of ECM connector and body
ground.
Is voltage 10 – 14 V?Go to Step 11. Go to Step 8.
8Main relay circuit check
1) Remove main relay (1) from individual circuit fuse box
No.1.
2) Check for proper connection to main relay connector at
“BLK/YEL” and “BLK/RED” wire terminals.
3) If OK, measure resistance between each “E01-1” and
“E01-16” wire terminals of ECM connector and “BLK/
RED” wire terminal of main relay connector.
Is resistance 1
Ω or less?Go to Step 9. “BLK/RED” wire is open
circuit or high resistance
circuit.
9Main relay circuit check
1) Remove main relay from individual circuit fuse box No.1
with ignition switch turned OFF.
2) Measure voltage between “BLK/YEL” wire terminal of
main relay connector and body ground.
Is voltage 10 – 14 V?Go to Step 10. “BLK/YEL” wire is open
circuit.
10Main relay check
1) Check main relay referring to “Main Relay, Fuel Pump
Relay, Starting Motor Control Relay, Throttle Actuator
Control Relay and Radiator Cooling Fan Relay
Inspection in Section 1C”.
Is main relay in good condition?“BRN/WHT” wire is
open or high resistance
circuit.Replace main relay. Step Action Yes No
1
I5RW0A110059-02