throttle position sensor SUZUKI SX4 2006 1.G Service User Guide

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

Downloaded from www.Manualslib.com manuals search engine 1A-36 Engine General Information and Diagnosis:
For Vehicle Equipped with A/TS6RW0D1104081
NOTE
There are two types of OBD system depending on the vehicle specification.
For identification, refer to “Precaution on On-Board Diagnostic (OBD) System”.

When using CAN communication OBD generic scan tool, not only the previous star (*) marked ECM DTC(s) but also
the following DTC(s) is displayed on CAN communication OBD generic scan tool simultaneously.
Fail-Safe TableS6RW0D1104006
When any of the following DTCs is detected, ECM enters fail-safe mode as long as malfunction continues to exist but
that mode is cancelled when ECM detects normal condition after that. DTC No. Detecting itemDetecting condition
(DTC will set when detecting)
P0705 Transmission range sensor circuit malfunction (PRNDL input)
Refer to “DTC Table in Section 5A”. P0707 Transmission range sensor circuit low
P0711Transmission fluid temperature sensor “A” circuit range/
performance
P0712 Transmission fluid temperature sensor circuit low
P0713 Transmission fluid temperature sensor circuit high
P0717 Input/Turbine speed sensor circuit no signal
P0722 Output speed sensor (VSS) circuit no signal
P0741 Torque converter clutch circuit performance or stuck off
P0742 Torque converter clutch circuit stuck on
P0751 Shift solenoid-A (No.1) performance or stuck off
P0752 Shift solenoid-A (No.1) stuck on
P0756 Shift solenoid-B (No.2) performance or stuck off
P0757 Shift solenoid-B (No.2) stuck on
P0787 Shift/Timing solenoid control circuit low
P0788 Shift/Timing solenoid control circuit high
P0961 Pressure control solenoid “A” control circuit range/performance
P0962 Pressure control solenoid control circuit low
P0963 Pressure control solenoid control circuit high
P0973 Shift solenoid-A (No.1) control circuit low
P0974 Shift solenoid-A (No.1) control circuit high
P0976 Shift solenoid-B (No.2) control circuit low
P0977 Shift solenoid-B (No.2) control circuit high
P1702 Internal control module memory check sum error
P1723 Range select switch malfunction
P1878 Torque converter clutch shudder
P2762Torque converter clutch (TCC) pressure control solenoid control
circuit range/performance
P2763Torque converter clutch pressure control solenoid control circuit
high
P2764Torque converter clutch pressure control solenoid control circuit
low
U0100 Lost communication with ECM/PCM “A”
DTC No. Detected item Fail-safe operation
) P0102 Mass air flow circuit low input • ECM controls injector drive time (fuel injection
volume) according to throttle valve opening
(closed throttle position or not).
• ECM stops EGR control. ) P0103 Mass air flow circuit high input
) P0112 Intake air temperature sensor circuit low ECM controls actuators assuming that intake air
temperature is 20 °C (68 °F). ) P0113 Intake air temperature sensor circuit high
) P0117 Engine coolant temperature circuit low • ECM controls actuators assuming that engine
coolant temperature is 80 °C (176 °F).
• ECM operates radiator cooling fan. ) P0118 Engine coolant temperature circuit high

Downloaded from www.Manualslib.com manuals search engine Engine General Information and Diagnosis: 1A-37
) 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

Downloaded from www.Manualslib.com manuals search engine 1A-38 Engine General Information and Diagnosis:
Scan Tool DataS6RW0D1104007
As the data values are standard values estimated on the basis of values obtained from the normally operating vehicles
by using a scan tool, use them as reference values. Even when the vehicle is in good condition, there may be cases
where the checked value does not fall within each specified data range. Therefore, judgment as abnormal should not
be made by checking with these data alone.
Also, conditions that can be checked by the scan tool are those detected by ECM and output from ECM as commands
and there may be cases where the engine or actuator is not operating (in the condition) as indicated by the scan tool.
Be sure to use the timing light to check the ignition timing.
NOTE
• There are two types of OBD system depending on the vehicle specification.
For identification, refer to “Precaution on On-Board Diagnostic (OBD) System”.
• With the CAN communication generic scan tool, only star (*) marked data in the following table can
be read.
• When checking the data with the engine running at idle or racing, be sure to shift M/T gear to the
neutral position and A/T gear to the “Park” position and pull the parking brake fully. Also, if nothing
or “no load” is indicated, turn OFF A/C (if equipped with A/C), all electric loads, P/S and all the other
necessary switches.

Scan tool data Vehicle conditionNormal condition /
reference values
*) COOLANT TEMP
(ENGINE COOLANT TEMP.)At specified idle speed after warming up 80 – 100 °C, 176 – 212 °F
*) INTAKE AIR TEMP. At specified idle speed after warming up–5 °C (23 °F) + environmental
temp. to 40 °C (104 °F) +
environmental temp.
*) ENGINE SPEED It idling with no load after warming up Desired idle speed ± 50 rpm
) DESIRED IDLE
(DESIRED IDLE SPEED)It idling with radiator cooling fan stopped and all
electrical parts turned OFF after warming up, M/T at
neutral700 rpm
*) MAF
(MASS AIR FLOW RATE)At specified idle speed with no load after warming up1.0 – 4.0 g/s 0.14 – 0.52 lb/
min.
At 2500 r/min. with no load after warming up4.0 – 9.0 g/s 0.53 – 1.58 lb/
min.
*) CALC LOAD
(CALCULATED LOAD
VA L U E )At specified idle speed with no load after warming up 16 – 36%
At 2500 r/min. with no load after warming up 10 – 30%
*) MAP
(INTAKE MANIFOLD
ABSOLUTE PRESSURE) (if
equipped)At specified idle speed with no load after warming up 24 – 38 kPa, 7.1 – 11.2 in.Hg
*) THROTTLE POSITION
(RELATIVE THROTTLE
POSITION)Ignition switch ON /
warmed up engine
stoppedAccelerator pedal released 0 – 12%
Accelerator pedal depressed
fully90 – 100%
*) BAROMETRIC PRES —Barometric pressure is
displayed
) FUEL TANK LEVEL Ignition switch ON 0 – 100%
*) BATTERY VOLTAGE Ignition switch ON / engine at stop 10 – 14 V
) BRAKE SWITCH Ignition switch ONBrake pedal is released OFF
Brake pedal is depressed ON
*) FUEL SYSTEM B1
(FUEL SYSTEM STATUS)At specified idle speed after warming up CLSD (closed loop)
*) O2S B1 S1
(HEATED OXYGEN
SENSOR-1)At specified idle speed after warming up 0.1 – 0.95 V
*)
O2S B1 S2
(HEATED OXYGEN
SENSOR-2) (if equipped)At 2000 r/min. for 3 min. or longer after warming up 0.1 – 0.95 V

Downloaded from www.Manualslib.com manuals search engine 1A-40 Engine General Information and Diagnosis:
) RADIATOR FAN
(RADIATOR COOLING FAN
CONTROL RELAY)Ignition switch ONEngine coolant temp.: lower
than 97.5 °C (207.5 °F)OFF
Engine coolant temp.: 100
°C (212 °F)ON
) A/C COND FAN
(A/C CONDENSER
COOLING FAN CONTROL
RELAY)Engine runningBlower motor switch and A/C
switch turned ON/ECT over
102.5 °C (216.5 °F)ON
Blower motor switch and/or
A/C switch turned OFFOFF
) TP SENSOR 1 VOLT
(THROTTLE POSITION
SENSOR (MAIN) OUTPUT
VOLTAGE)Ignition switch ON
after warmed up
engineAccelerator pedal released 0.48 – 0.90 V
Accelerator pedal depressed
fully3.37 – 4.55 V
) TP SENSOR 2 VOLT
(THROTTLE POSITION
SENSOR (SUB) OUTPUT
VOLTAGE)Ignition switch ON
after warmed up
engineAccelerator pedal released 1.36 – 1.75 V
Accelerator pedal depressed
fully3.58 – 4.76 V
) APP SENSOR 1 VOLT
(ACCELERATOR PEDAL
POSITION (APP) SENSOR
(MAIN) OUTPUT VOLTAGE)Ignition switch ON
after warmed up
engineAccelerator pedal released 0.69 – 0.81 V
Accelerator pedal depressed
fully3.43 – 4.56 V
) APP SENSOR 2 VOLT
(ACCELERATOR PEDAL
POSITION (APP) SENSOR
(SUB) OUTPUT VOLTAGE)Ignition switch ON
after warmed up
engineAccelerator pedal released 0.31 – 0.44 V
Accelerator pedal depressed
fully1.71 – 2.29 V
*) ACCEL POSITION
(RELATIVE ACCELERATOR
PEDAL POSITION)Ignition switch ON
after warmed up
engineAccelerator pedal released 0 – 3%
Accelerator pedal depressed
fully90 – 100%
*) TARGET THROTTLE
POSI
(TARGET THROTTLE
VALVE POSITION)Ignition switch ON
after warmed up
engineAccelerator pedal released 0 – 3%
Accelerator pedal depressed
fully90 – 100%
) IAC THROTTLE
OPENING
(IDLE AIR CONTROL
THROTTLE VALVE
OPENNING)It idling with no load after warming up 5 – 25%
) THROTTLE MOTOR
VOLTIgnition switch ON / engine at stop 10.0 – 14.0 V
) CLOSED THROTTLE
POS
(CLOSED THROTTLE
POSITION)Throttle valve at idle position ON
Throttle valve opens larger than idle position OFF
) THROTTLE MOTOR
RELAYAt specified idle speed after warming up ON
*) VEHICLE SPEED At stop 0 km/h (0 mph)
) INJ PULSE WIDTH
(FUEL INJECTION PULSE
WIDTH)At specified idle speed with no load after warming up 1.5 – 3.5 msec.
At 2500 r/min. no load after warming up 1.5 – 3.0 msec. Scan tool data Vehicle conditionNormal condition /
reference values

Downloaded from www.Manualslib.com manuals search engine Engine General Information and Diagnosis: 1A-41
Scan Tool Data Definitions
COOLANT TEMP (ENGINE COOLANT
TEMPERATURE, °C, °F)
It is detected by engine coolant temp. sensor.
INTAKE AIR TEMP. (°C, °F)
It is detected by intake air temp. sensor.
ENGINE SPEED (rpm)
It is computed by reference pulses from the camshaft
position sensor.
DESIRED IDLE (DESIRED IDLE SPEED, rpm)
The Desired Idle Speed is an ECM internal parameter
which indicates the ECM requested idle. If the engine is
not running, this number is not valid.
MAF (MASS AIR FLOW RATE, g/s, lb/min.)
It represents total mass of air entering intake manifold
which is measured by mass air flow sensor.
CALC LOAD (CALCULATED LOAD VALUE, %)
Engine load displayed as a percentage of maximum
possible load. Value is calculated mathematically using
the formula: actual (current) intake air volume ÷
maximum possible intake air volume × 100%
MAP (MANIFOLD ABSOLUTE PRESSURE, in.Hg,
kPa)
This value indicates how much correction is necessary
to keep the air/fuel mixture stoichiometrical.
It is detected by manifold absolute pressure sensor.
THROTTLE POS (RELATIVE THROTTLE POSITION,
%)
When throttle position sensor is at fully closed position,
throttle opening is indicated as 0 – 12% and 90 – 100%
full open position.
BAROMETRIC PRESS (kPa, in.Hg)
This parameter represents a measurement of barometric
air pressure and is used for altitude correction of the fuel
injection quantity.
FUEL TANK LEVEL (%)
This parameter indicates approximate fuel level in fuel
tank. As detectable range of fuel level sensor is set as 0
to 100%, however, with some models whose fuel tank
capacity is smaller, indicated fuel level may be only 70%
even when fuel tank is full.
BATTERY VOLTAGE (V)
This parameter indicates battery positive voltage
inputted from main relay to ECM.
BRAKE SW (ON/OFF)
This parameter indicates the state of the brake switch.FUEL SYSTEM B1 (FUEL SYSTEM STATUS)
Air/fuel ratio feedback loop status displayed as one of
the followings.
OPEN: Open-loop has not yet satisfied conditions to go
closed loop.
CLOSED: Closed-loop using oxygen sensor(s) as
feedback for fuel control.
OPEN-DRIVE COND: Open-loop due to driving
conditions (Power enrichment, etc.).
OPEN SYS FAULT: Open-loop due to detected system
fault.
O2S SENSOR B1 S1 (HEATED OXYGEN SENSOR-1,
V)
It indicates output voltage of HO2S-1 installed on
exhaust manifold (pre-catalyst.)
O2S SENSOR B1 S2 (HEATED OXYGEN SENSOR-2,
V)
It indicates output voltage of HO2S-2 installed on
exhaust pipe (post-catalyst). It is used to detect catalyst
deterioration.
SHORT FT B1 (SHORT TERM FUEL TRIM, %)
Short term fuel trim value represents short term
corrections to the air/fuel mixture computation. A value
of 0 indicates no correction, a value greater than 0
means an enrichment correction, and a value less than 0
implies an enleanment correction.
LONG FT B1 (LONG TERM FUEL TRIM, %)
Long term fuel trim value represents long term
corrections to the air/fuel mixture computation. A value
of 0 indicates no correction, a value greater than 0
means an enrichment correction, and a value less than 0
implies an enleanment correction.
TOTAL FUEL TRIM B1 (%)
The value of Total Fuel Trim is obtained by calculating
based on values of Short Term Fuel Trim and Long Term
Fuel Trim. This value indicates how much correction is
necessary to keep the air/fuel mixture stoichiometrical.
FUEL CUT (ON/OFF)
ON: Fuel being cut (output signal to injector is stopped)
OFF: Fuel not being cut
O2S B1 S2 ACT (HEATED OXYGEN SENSOR-2,
ACTIVE / INACTIVE)
This parameter indicates activation condition of HO2S-2
ACTIVE: Activating
INACTIVE: warming up or at stop
O2S B1 S1 ACT (HEATED OXYGEN SENSOR-1,
ACTIVE / INACTIVE)
This parameter indicates activation condition of HO2S-1
ACTIVE: Activating
INACTIVE: warming up or at stop

Downloaded from www.Manualslib.com manuals search engine 1A-42 Engine General Information and Diagnosis:
CANIST PRG DUTY (EVAP CANISTER PURGE FLOW
DUTY, %)
This parameter indicates valve ON (valve open) time
rate within a certain set cycle of EVAP canister purge
valve which controls the amount of EVAP purge.
IGNITION ADVANCE (IGNITION TIMING ADVANCE
FOR NO.1 CYLINDER, °)
Ignition timing of No.1 cylinder is commanded by ECM.
The actual ignition timing should be checked by using
the timing light.
EGR VALVE OPENING (%)
This parameter indicates opening rate of EGR valve
which controls the amount of EGR flow.
VVT GAP (TARGET-ACTUAL POSITION, °) (VVT
model)
It is calculated using the formula: target valve timing
advance – actual valve timing advance.
FUEL PUMP (ON/OFF)
ON is displayed when ECM activates the fuel pump via
the fuel pump relay switch.
STARTER SW (STARTER SWITCH, ON/OFF)
This parameter indicates condition of starting motor relay
output.
ON: Starting motor relay is ON
OFF: Starting motor relay is OFF
A/C PRESSURE (A/C REFRIGERANT ABSOLUTE
PRESSURE, kPa)
This parameter indicates A/C refrigerant absolute
pressure calculated by ECM.
A/C SWITCH (ON/OFF)
ON: Command for A/C operation being output from ECM
to HVAC.
OFF: Command for A/C operation not being output.
A/C COMP RELAY (A/C COMPRESSOR RELAY, ON/
OFF)
This parameter indicates the state of the A/C switch.
BLOWER FAN (ON/OFF)
This parameter indicates the state of the blower fan
motor switch.
ELECTRIC LOAD (ON/OFF)
ON: Headlight or small light ON signal inputted.
OFF: Above electric loads all turned OFF.
RADIATOR COOLING FAN (RADIATOR COOLING
FAN CONTROL RELAY, ON/OFF)
ON: Command for radiator cooling fan control relay
operation being output.
OFF: Command for relay operation not being output.A/C COND FAN (A/C CONDENSER COOLING FAN
CONTROL RELAY, ON/OFF)
ON: Command for A/C condenser cooling fan control
relay operation being output.
OFF: Command for relay operation not being output.
TP SENSOR 1 VOLT (THROTTLE POSITION SENSOR
(MAIN) OUTPUT VOLTAGE, V)
The Throttle Position Sensor (Main) reading provides
throttle valve opening information in the form of voltage.
TP SENSOR 2 VOLT (THROTTLE POSITION SENSOR
(SUB) OUTPUT VOLTAGE, V)
The Throttle Position Sensor (Sub) reading provides
throttle valve opening information in the form of voltage.
APP SENSOR 1 VOLT (ACCELERATOR PEDAL
POSITION (APP) SENSOR (MAIN) OUTPUT
VOLTAGE, V)
The Accelerator Pedal Position (APP) Sensor (Main)
reading provides accelerator pedal opening information
in the form of voltage.
APP SENSOR 2 VOLT (ACCELERATOR PEDAL
POSITION (APP) SENSOR (SUB) OUTPUT VOLTAGE,
V)
The Accelerator Pedal Position (APP) Sensor (Sub)
reading provides accelerator pedal opening information
in the form of voltage.
ACCEL POSITION (RELATIVE ACCELERATOR
PEDAL POSITION, %)
When accelerator pedal is at fully released position,
accelerator pedal is indicated as 0 – 3% and 90 – 100%
fully depressed position.
TARGET THROTTLE POSI (TARGET THROTTLE
VALVE POSITION, %)
Target Throttle Valve Position is ECM internal parameter
which indicates the ECM requested throttle valve
position.
IAC THROTTLE OPENING (IDLE AIR (SPEED)
CONTROL THROTTLE VALVE OPENING, %)
This parameter indicates throttle valve opening of idle air
control in %.
(100% indicates the maximum idle air flow.)
THROTTLE MOTOR VOLT (V)
This parameter indicates power supply voltage of throttle
actuator (motor) control circuit (input voltage from
throttle actuator control relay).
CLOSED THROTTLE POS (CLOSED THROTTLE
POSITION, ON/OFF)
This parameter reads ON when throttle valve is fully
closed, or OFF when it is not fully closed.

Downloaded from www.Manualslib.com manuals search engine Engine General Information and Diagnosis: 1A-45
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

Downloaded from www.Manualslib.com manuals search engine Engine General Information and Diagnosis: 1A-47
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