valve body SUZUKI SX4 2006 1.G Service User Guide

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Component Location
Electronic Control System Components LocationS6RW0D1103001
NOTE
The figure shows left-hand steering vehicle. For right-hand steering vehicle, parts with (*) are installed
at the opposite side.

H*E*
10
D
G* C
6A
B*
e
3*
12*
a8 13
b
1
5-1
d
2
11
g
4
7
9
i
j
Fh k f
n
c J
5
K*
14
I6RW0D110016-03
Information sensors Control devices Others
1. MAF and IAT sensor a: Fuel injector A: ECM
2. Electric throttle body assembly
(built-in throttle position sensor and throttle
actuator)b: EVAP canister purge valve B: Combination meter
3. Brake light switch c: Fuel pump relay C: EVAP canister
4. ECT sensor d: EGR valve (if equipped) D: A/C evaporator outlet air temp. sensor
(if equipped with A/C)
5. Heated oxygen sensor-1 e: Malfunction indicator lamp E: Data link connector
5-1. Heated oxygen sensor-2 (if equipped) f: Radiator cooling fan relay F: A/C compressor relay (if equipped with A/C)
6. Battery g: Ignition coil assembly (with ignitor) G: BCM (included in junction block assembly)
7. CMP sensor (for engine with VVT system) h: Main relay H: Immobilizer coil antenna
8. MAP sensor (if equipped) i: Oil control valve (for engine with VVT system) J: A/C refrigerant pressure sensor
(if equipped with A/C)
9. CKP sensor j: A/C condenser cooling fan relay K: TCM (for A/T model)
10. Fuel level sensor k: Starting motor control relay
11. Knock sensor m: Immobilizer indicator lamp
12. APP sensor n: Throttle actuator control relay
13. Front wheel speed sensor (RH, LH) (VSS)
14. CMP sensor (for engine without VVT system)

Downloaded from www.Manualslib.com manuals search engine 1A-34 Engine General Information and Diagnosis:
)
U*P0420Catalyst system efficiency below
thresholdOutput waveforms of HO2S-1 and HO2S-2 are similar.2 driving
cycles
)
U*P0443Evaporative emission system purge
control valve circuitMonitor signal of EVAP canister purge valve is different
from command signal. (circuit open or shorted to ground)2 driving
cycles
) P0462 Fuel level sensor circuit lowCircuit voltage of fuel level sensor is less than
specification.—
) P0463 Fuel level sensor circuit highCircuit voltage of fuel level sensor is more than
specification.—
)
U*P0480Fan 1 control circuitMonitor signal of radiator cooling fan relay is different from
command signal.1 driving
cycle
)
UP0481Fan 2 control circuitMonitor signal of A/C condenser cooling fan relay is
different from command signal.—
) *P0500 Vehicle speed sensor No VSS signal during fuel cut for specified time or longer.2 driving
cycles
) P0532A/C refrigerant pressure sensor
circuit lowOutput voltage of A/C refrigerant pressure sensor is less
than specification.—
) P0533A/C refrigerant pressure sensor
circuit highOutput voltage of A/C refrigerant pressure sensor is more
than specification.—
) *P0601Internal control module memory
check sum errorData write error or check sum error.1 driving
cycle
) P0602 Control module programming error Data programming error.1 driving
cycle
) *P0607 Control module performance Data programming error.1 driving
cycle
)
U*P0616Starter relay circuit lowStarter signal is low voltage even though engine is started
with vehicle at stop.2 driving
cycles
)
U*P0617Starter relay circuit highStarter signal is high voltage for specified time while
engine is running.2 driving
cycles
) *P1510
ECM backup power supply
malfunctionBackup power voltage is out of specification after starting
engine.1 driving
cycle
) *P2101Throttle actuator control motor
circuit range/performanceMonitor signal of throttle actuator output (duty output) is
inconsistent with throttle actuator control command.1 driving
cycle
) *P2102Throttle actuator control motor
circuit lowPower supply voltage of throttle actuator control circuit is
lower than specification even if throttle actuator control
relay turned on.1 driving
cycle
) *P2103Throttle actuator control motor
circuit highPower supply voltage of throttle actuator control circuit is
higher than specification even if throttle actuator control
relay turned off.1 driving
cycle
) *P2111Throttle actuator control system –
stuck openThrottle valve default opening is greater than 8° from
complementary closed position when diagnosing throttle
valve at ignition switch turned OFF.1 driving
cycle
) *P2119Throttle actuator control throttle
body range/performanceDifference between actual throttle valve opening angle
and opening angle calculated by ECM is more than
specification.1 driving
cycle
) *P2122Pedal position sensor (main) circuit
low inputOutput voltage of pedal position sensor (main) is lower
than specification.1 driving
cycle
) *P2123Pedal position sensor (main) circuit
high inputOutput voltage of pedal position sensor (main) is higher
than specification.1 driving
cycle
) *P2127Pedal position sensor (sub) circuit
low inputOutput voltage of pedal position sensor (sub) is lower
than specification.1 driving
cycle
) *P2128Pedal position sensor (sub) circuit
high inputOutput voltage of pedal position sensor (sub) is higher
than specification.1 driving
cycle
) *P2135Throttle position sensor (main / sub)
voltage correlationDifference between the opening angle based on throttle
position sensor (main) and the opening angle based on
throttle position sensor (sub) is more than specification.1 driving
cycle DTC No. Detecting itemDetecting condition
(DTC will set when detecting:)MIL

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) P0122 Throttle position sensor (main) circuit low• ECM turns off throttle actuator control relay and
throttle valve is fixed at the opening of about 7°
from its completely closed position (default
opening).
• ECM controls fuel cut at specified engine speed.
• ECM stops air/fuel ratio control.
) P0123 Throttle position sensor (main) circuit high• ECM turns off throttle actuator control relay and
throttle valve is fixed at the opening of about 7°
from its completely closed position (default
opening).
• ECM controls fuel cut at specified engine speed.
• ECM stops air/fuel ratio control. ) P0222 Throttle position sensor (sub) circuit low
) P0223 Throttle position sensor (sub) circuit high
) P0335 Crankshaft position sensor circuit • Ignition timing is fixed.
) P0340 Camshaft position sensor circuitECM changes injection control system from
sequential injection to simultaneous one.
) P0500 Vehicle speed sensor• ECM controls actuators assuming that vehicle
speed is 0 km/h (0 mile/h).
• ECM stops IAC feedback control.
) P2101Throttle actuator control motor circuit range
/ performance)• ECM turns off throttle actuator control relay and
throttle valve is fixed at the opening of about 7°
from its completely closed position (default
opening).
• ECM controls fuel cut at specified engine speed. ) P2102 Throttle actuator control motor circuit low
) P2103 Throttle actuator control motor circuit highECM controls fuel cut at specified engine speed.
) P 2 111Throttle actuator control system – stuck
open)• ECM turns off throttle actuator control relay and
throttle valve is fixed at the opening of about 7°
from its completely closed position (default
opening).
• ECM controls fuel cut at specified engine speed.
) P2119Throttle actuator control throttle body range
/ performance)• ECM turns off throttle actuator control relay and
throttle valve is fixed at the opening of about 7°
from its completely closed position (default
opening).
• ECM controls fuel cut at specified engine speed.
) P2122Pedal position sensor (main) circuit low
input)
• ECM turns off throttle actuator control relay and
throttle valve is fixed at the opening of about 7°
from its completely closed position (default
opening).
• ECM controls fuel cut at specified engine speed. ) P2123Pedal position sensor (main) circuit high
input)
) P2127 Pedal position sensor (sub) circuit low input)
) P2128Pedal position sensor (sub) circuit high
input)
) P2135Throttle position sensor (main) / (sub)
voltage correlation)
) P2138Pedal position sensor (main) / (sub) voltage
correlation)
) P2228 Barometric pressure circuit low ECM controls actuators assuming that barometric
pressure is 101.33 kPa (762 mmHg). ) P2229 Barometric pressure circuit high DTC No. Detected item Fail-safe operation

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THROTTLE MOTOR RELAY (ON/OFF)
ON: Throttle actuator (motor) control activated by ECM.
OF: Throttle actuator (motor) control stopped by ECM.
VEHICLE SPEED (km/h, mph)
It is computed based on pulse signals from front wheel
speed sensor (RH, LH) (for M/T model) or output shaft
speed sensor (VSS) (for A/T model).INJ PULSE WIDTH (FUEL INJECTION PULSE WIDTH,
msec.)
This parameter indicates time of the injector drive (valve
opening) pulse which is output from ECM (but injector
drive time of NO.1 cylinder for multiport fuel injection).
Visual InspectionS6RW0D1104008
Visually check the following parts and systems.
Engine Basic InspectionS6RW0D1104009
This check is very important for troubleshooting when ECM has detected no DTC and no abnormality has been found
in “Visual Inspection”.
Follow the flow carefully.Inspection item Reference section
• Engine oil – level, leakage “Engine Oil and Filter Change in Section 0B”
• Engine coolant – level, leakage “Coolant Level Check in Section 1F”
• Fuel – level, leakage“Fuel Lines and Connections Inspection in
Section 0B”
• Air cleaner element – dirt, clogging “Air Cleaner Filter Inspection in Section 0B”
• Battery – fluid level, corrosion of terminal“Battery Dismounting and Remounting in
Section 1J”
• Water pump belt – tension damage“Accessory Drive Belt Inspection in Section
0B”
• Throttle valve – operating sound“Electric Throttle Body Assembly On-Vehicle
Inspection in Section 1C”
• Vacuum hoses of air intake system – disconnection, looseness,
deterioration, bend“Vacuum Hose Inspection in Section 1B”
• Connectors of electric wire harness – disconnection, friction
• Fuses – burning
• Parts – installation, bolt – looseness
• Parts – deformation
• Other parts that can be checked visually
Also check the following items at engine start, if possible
• Malfunction indicator lamp – Operation “Malfunction Indicator Lamp (MIL) Check”
• Charge warning lamp – Operation “Generator Symptom Diagnosis in Section 1J”
• Engine oil pressure warning lamp – Operation “Oil Pressure Switch Inspection in Section 9C”
• Engine coolant temp. meter – Operation“Engine Coolant Temperature (ECT) Sensor
Inspection in Section 1C”
• Fuel level meter – Operation “Fuel Level Sensor Inspection in Section 9C”
• Tachometer – Operation
• Abnormal air being inhaled from air intake system
• Exhaust system – leakage of exhaust gas, noise
• Other parts that can be checked visually
Step Action Yes No
1Was “Engine and Emission Control System Check”
performed?Go to Step 2. Go to “Engine and
Emission Control
System Check”.
2Check battery voltage
Is it 11 V or more?Go to Step 3. Charge or replace
battery.
3Is vehicle equipped with keyless start control system?Go to Step 4. Go to Step 5.

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Engine Symptom DiagnosisS6RW0D1104010
Perform troubleshooting referring to the followings when ECM has detected no DTC and no abnormality has been
found in “Visual Inspection” and “Engine Basic Inspection”.
Condition Possible cause Correction / Reference Item
Hard starting (Engine
cranks OK)Faulty spark plug“Spark Plug Inspection in Section 1H”
Leaky high-tension cord“High-Tension Cord Inspection in Section 1H”
Loose connection or disconnection of
high-tension cord(s) or lead wire(s)“High-Tension Cord Removal and Installation
in Section 1H”
Faulty ignition coil“Ignition Coil Assembly (Including Ignitor)
Inspection in Section 1H”
Dirty or clogged fuel hose or pipe“Fuel Pressure Check”
Malfunctioning fuel pump“Fuel Pressure Check”
Air drawn in through intake manifold
gasket or throttle body gasket
Faulty electric throttle body assembly“Electric Throttle Body Assembly On-Vehicle
Inspection in Section 1C”
Faulty APP sensor assembly“Accelerator Pedal Position (APP) Sensor
Assembly Inspection in Section 1C”
Faulty ECT sensor or MAF sensor“Engine Coolant Temperature (ECT) Sensor
Inspection in Section 1C” or “Intake Air
Temperature (IAT) Sensor Inspection in
Section 1C”
Faulty ECM
Low compression“Compression Check in Section 1D”
Poor spark plug tightening or faulty
gasket“Spark Plug Removal and Installation in
Section 1H”
Compression leak from valve seat“Valves and Valve Guides Inspection in
Section 1D”
Sticky valve stem“Valves and Valve Guides Inspection in
Section 1D”
Weak or damaged valve springs“Valve Spring Inspection in Section 1D”
Compression leak at cylinder head
gasket“Cylinder Head Inspection in Section 1D”
Sticking or damaged piston ring“Cylinders, Pistons and Piston Rings
Inspection in Section 1D”
Worn piston, ring or cylinder“Cylinders, Pistons and Piston Rings
Inspection in Section 1D”
Malfunctioning PCV valve“PCV Valve Inspection in Section 1B”
Camshaft position control (VVT) system
out of order (for engine with VVT
system)“Oil Control Valve Inspection (For Engine with
VVT) in Section 1D”
Faulty EGR system“EGR System Inspection (If Equipped) in
Section 1B”
Low oil pressureImproper oil viscosity“Engine Oil and Filter Change in Section 0B”
Malfunctioning oil pressure switch“Oil Pressure Switch Inspection in Section 9C”
Clogged oil strainer“Oil Pan and Oil Pump Strainer Cleaning in
Section 1E”
Functional deterioration of oil pump“Oil Pump Inspection in Section 1E”
Worn oil pump relief valve“Oil Pump Inspection in Section 1E”
Excessive clearance in various sliding
parts

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Engine overheatingInoperative thermostat“Thermostat Inspection in Section 1F”
Poor water pump performance“Water Pump Inspection in Section 1F”
Clogged or leaky radiator“Radiator On-Vehicle Inspection and Cleaning
in Section 1F”
Improper engine oil grade“Engine Oil and Filter Change in Section 0B”
Clogged oil filter or oil strainer“Oil Pressure Check in Section 1E”
Poor oil pump performance“Oil Pressure Check in Section 1E”
Faulty radiator cooling fan control
system“Radiator Cooling Fan Control System Check”
Dragging brakesCondition “Dragging brakes” in “Brakes
Symptom Diagnosis in Section 4A”
Slipping clutch (for M/T model)Condition “Slipping clutch” in “Clutch System
Symptom Diagnosis in Section 5C” for M/T
model
Blown cylinder head gasket“Cylinder Head Inspection in Section 1D”
Air mixed in cooling system
Poor gasoline mileageLeaks or loose connection of high-
tension cord“High-Tension Cord Removal and Installation
in Section 1H”
Faulty spark plug (improper gap, heavy
deposits and burned electrodes, etc.)“Spark Plug Inspection in Section 1H”
Malfunctioning EGR valve“EGR Valve Inspection (If Equipped) in Section
1B”
High idle speedCondition “Improper engine idling or engine
fails to idle”
Poor performance of ECT sensor, MAF
sensor“Engine Coolant Temperature (ECT) Sensor
Inspection in Section 1C”, or “Intake Air
Temperature (IAT) Sensor Inspection in
Section 1C”
Faulty electric throttle body assembly“Electric Throttle Body Assembly On-Vehicle
Inspection in Section 1C”
Faulty APP sensor assembly“Accelerator Pedal Position (APP) Sensor
Assembly Inspection in Section 1C”
Faulty fuel injector(s)“Fuel Injector Circuit Check”
Faulty ECM
Low compression“Compression Check in Section 1D”
Poor valve seating“Valves and Valve Guides Inspection in
Section 1D”
Dragging brakesCondition “Dragging brakes” in “Brakes
Symptom Diagnosis in Section 4A”
Slipping clutch (for M/T model)Condition “Slipping clutch” in “Clutch System
Symptom Diagnosis in Section 5C” for M/T
model
Thermostat out of order“Thermostat Inspection in Section 1F”
Improper tire pressure“Tires Description in Section 2D”
Camshaft position control (VVT) system
out of order (for engine with VVT
system)“Oil Control Valve Inspection (For Engine with
VVT) in Section 1D”
Excessive engine oil
consumption – Oil
leakageBlown cylinder head gasket“Cylinder Head Inspection in Section 1D”
Leaky camshaft oil seals“Camshaft, Tappet and Shim Inspection in
Section 1D” Condition Possible cause Correction / Reference Item

Downloaded from www.Manualslib.com manuals search engine 1A-48 Engine General Information and Diagnosis:
Excessive engine oil
consumption – Oil
entering combustion
chamberSticky piston ring“Cylinders, Pistons and Piston Rings
Inspection in Section 1D”
Worn piston and cylinder“Cylinders, Pistons and Piston Rings
Inspection in Section 1D”
Worn piston ring groove and ring“Cylinders, Pistons and Piston Rings
Inspection in Section 1D”
Improper location of piston ring gap“Pistons, Piston Rings, Connecting Rods and
Cylinders Disassembly and Assembly in
Section 1D”
Worn or damaged valve stem seal“Valves and Valve Guides Inspection in
Section 1D”
Worn valve stem“Valves and Valve Guides Inspection in
Section 1D”
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.Spark plug faulty or plug gap out of
adjustment“Spark Plug Inspection in Section 1H”
Leaky high-tension cord“High-Tension Cord Inspection in Section 1H”
Fuel pressure out of specification“Fuel Pressure Check”
Malfunctioning EGR valve“EGR Valve Inspection (If Equipped) in Section
1B”
Poor performance of ECT sensor or
MAF sensor, “Engine Coolant Temperature (ECT) Sensor
Inspection in Section 1C” or “Intake Air
Temperature (IAT) Sensor Inspection in
Section 1C”
Faulty electric throttle body assembly“Electric Throttle Body Assembly On-Vehicle
Inspection in Section 1C”
Faulty APP sensor assembly“Accelerator Pedal Position (APP) Sensor
Assembly Inspection in Section 1C”
Faulty fuel injector“Fuel Injector Circuit Check”
Faulty ECM
Engine overheatingCondition “Engine overheating”
Low compression“Compression Check in Section 1D”
Camshaft position control (VVT) system
out of order (for engine with VVT
system)“Oil Control Valve Inspection (For Engine with
VVT) in Section 1D”
Surge – Engine power
variation under steady
throttle or cruise. Feels
like vehicle speeds up
and down with no change
in accelerator pedal.Leaky or loosely connected high-tension
cord“High-Tension Cord Removal and Installation
in Section 1H”
Faulty spark plug (excess carbon
deposits, improper gap, burned
electrodes, etc.)“Spark Plug Inspection in Section 1H”
Variable fuel pressure“Fuel Pressure Check”
Kinky or damaged fuel hose and lines
Faulty fuel pump (clogged fuel filter)
Malfunctioning EGR valve“EGR Valve Inspection (If Equipped) in Section
1B”
Poor performance of MAF sensor“Intake Air Temperature (IAT) Sensor
Inspection in Section 1C”
Faulty fuel injector“Fuel Injector Circuit Check”
Faulty ECM
Faulty electric throttle body assembly“Electric Throttle Body Assembly On-Vehicle
Inspection in Section 1C”
Faulty APP sensor assembly“Accelerator Pedal Position (APP) Sensor
Assembly Inspection in Section 1C” Condition Possible cause Correction / Reference Item

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Excessive detonation –
Engine makes
continuously sharp
metallic knocks that
change with throttle
opening. Sounds like pop
corn popping.Faulty spark plug“Spark Plug Inspection in Section 1H”
Loose connection of high-tension cord“High-Tension Cord Removal and Installation
in Section 1H”
Engine overheatingCondition “Engine overheating”
Clogged fuel filter (faulty fuel pump) or
fuel lines“Fuel Pressure Check” or “Fuel Pump and Its
Circuit Check”
Air drawn in through intake manifold or
throttle body gasket
Malfunctioning EGR valve“EGR Valve Inspection (If Equipped) in Section
1B”
Poor performance of knock sensor, ECT
sensor or MAF sensor“DTC P0327 / P0328: Knock Sensor Circuit
Low / High”, “Engine Coolant Temperature
(ECT) Sensor Inspection in Section 1C” or
“Intake Air Temperature (IAT) Sensor
Inspection in Section 1C”
Faulty fuel injector(s)“Fuel Injector Circuit Check”
Faulty ECM
Excessive combustion chamber
deposits“Cylinders, Pistons and Piston Rings
Inspection in Section 1D” and/or “Piston Pins
and Connecting Rods Inspection in Section
1D”
Camshaft position control (VVT) system
out of order (for engine with VVT
system)“Oil Control Valve Inspection (For Engine with
VVT) in Section 1D”
Engine has no powerFaulty spark plug“Spark Plug Inspection in Section 1H”
Faulty ignition coil with ignitor“Ignition Coil Assembly (Including Ignitor)
Inspection in Section 1H”
Leaks, loose connection or
disconnection of high-tension cord“High-Tension Cord Removal and Installation
in Section 1H”
Faulty knock sensor“DTC P0327 / P0328: Knock Sensor Circuit
Low / High”
Clogged fuel hose or pipe“Fuel Pressure Check”
Malfunctioning fuel pump“Fuel Pump and Its Circuit Check”
Air drawn in through intake manifold
gasket or throttle body gasket
Engine overheatingCondition “Engine overheating”
Malfunctioning EGR valve“EGR Valve Inspection (If Equipped) in Section
1B”
Poor performance of ECT sensor or
MAF sensor“Engine Coolant Temperature (ECT) Sensor
Inspection in Section 1C” or “Intake Air
Temperature (IAT) Sensor Inspection in
Section 1C”
Faulty electric throttle body assembly“Electric Throttle Body Assembly On-Vehicle
Inspection in Section 1C”
Faulty APP sensor assembly“Accelerator Pedal Position (APP) Sensor
Assembly Inspection in Section 1C”
Faulty fuel injector(s)“Fuel Injector Circuit Check”
Faulty ECM
Dragging brakesCondition “Dragging brakes” in “Brakes
Symptom Diagnosis in Section 4A”
Slipping clutch (for M/T model)Condition “Slipping clutch” in “Clutch System
Symptom Diagnosis in Section 5C” (for M/T
model)
Low compression“Compression Check in Section 1D”
Camshaft position control (VVT) system
out of order (for engine with VVT
system)“Oil Control Valve Inspection (For Engine with
VVT) in Section 1D” Condition Possible cause Correction / Reference Item

Downloaded from www.Manualslib.com manuals search engine 1A-50 Engine General Information and Diagnosis:
Improper engine idling or
engine fails to idleFaulty spark plug“Spark Plug Inspection in Section 1H”
Leaky or disconnected high-tension cord“High-Tension Cord Removal and Installation
in Section 1H”
Faulty ignition coil with ignitor“Ignition Coil Assembly (Including Ignitor)
Inspection in Section 1H”
Fuel pressure out of specification“Fuel Pressure Check”
Leaky manifold, throttle body, or cylinder
head gasket
Malfunctioning EGR valve“EGR Valve Inspection (If Equipped) in Section
1B”
Faulty evaporative emission control
system“EVAP Canister Purge Inspection in Section
1B”
Faulty EGR system“EGR System Inspection (If Equipped) in
Section 1B”
Faulty fuel injector(s)“Fuel Injector Circuit Check”
Poor performance of ECT sensor or
MAF sensor“Engine Coolant Temperature (ECT) Sensor
Inspection in Section 1C”, or “Intake Air
Temperature (IAT) Sensor Inspection in
Section 1C”
Faulty electric throttle body assembly“Electric Throttle Body Assembly On-Vehicle
Inspection in Section 1C”
Faulty APP sensor assembly“Accelerator Pedal Position (APP) Sensor
Assembly Inspection in Section 1C”
Faulty ECM
Loose connection or disconnection of
vacuum hoses
Malfunctioning PCV valve“PCV Valve Inspection in Section 1B”
Engine overheatingCondition “Engine overheating”
Low compression“Compression Check in Section 1D”
Camshaft position control (VVT) system
out of order (for engine with VVT
system)“Oil Control Valve Inspection (For Engine with
VVT) in Section 1D” Condition Possible cause Correction / Reference Item

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Excessive hydrocarbon
(HC) emission or carbon
monoxide (CO)Faulty spark plug“Spark Plug Inspection in Section 1H”
Leaky or disconnected high-tension cord“High-Tension Cord Removal and Installation
in Section 1H”
Faulty ignition coil with ignitor“Ignition Coil Assembly (Including Ignitor)
Inspection in Section 1H”
Low compression“Compression Check in Section 1D”
Lead contamination of three way
catalytic converterCheck for absence of filler neck restrictor.
Faulty evaporative emission control
system“EVAP Canister Purge Inspection in Section
1B”
Fuel pressure out of specification“Fuel Pressure Check”
Closed loop system (A/F feedback
compensation) fails (Poor performance
of ECT sensor or MAF sensor)“Engine Coolant Temperature (ECT) Sensor
Inspection in Section 1C” or “Intake Air
Temperature (IAT) Sensor Inspection in
Section 1C”
Faulty electric throttle body assembly“Electric Throttle Body Assembly On-Vehicle
Inspection in Section 1C”
Faulty APP sensor assembly“Accelerator Pedal Position (APP) Sensor
Assembly Inspection in Section 1C”
Faulty injector(s)“Fuel Injector Circuit Check”
Faulty ECM
Engine not at normal operating
temperature
Clogged air cleaner“Air Cleaner Filter Inspection and Cleaning in
Section 1D”
Vacuum leaks“Engine Vacuum Check in Section 1D”
Camshaft position control (VVT) system
out of order (for engine with VVT
system)“Oil Control Valve Inspection (For Engine with
VVT) in Section 1D”
Excessive nitrogen
oxides (NOx) emissionImproper ignition timing“Ignition Timing Inspection in Section 1H”
Lead contamination of catalytic
converterCheck for absence of filler neck restrictor.
Faulty EGR system“EGR System Inspection (If Equipped) in
Section 1B”
Fuel pressure out of specification“Fuel Pressure Check”
Closed loop system (A/F feedback
compensation) fails (Poor performance
of ECT sensor or MAF sensor)“Engine Coolant Temperature (ECT) Sensor
Inspection in Section 1C” or “Intake Air
Temperature (IAT) Sensor Inspection in
Section 1C”
Faulty electric throttle body assembly“Electric Throttle Body Assembly On-Vehicle
Inspection in Section 1C”
Faulty APP sensor assembly“Accelerator Pedal Position (APP) Sensor
Assembly Inspection in Section 1C”
Faulty injector(s)“Fuel Injector Circuit Check”
Faulty ECM
Camshaft position control (VVT) system
out of order (for engine with VVT
system)“Oil Control Valve Inspection (For Engine with
VVT) in Section 1D” Condition Possible cause Correction / Reference Item