Suzuki Grand Vitara JB416 / JB420. Manual — part 23

1A-41 Engine General Information and Diagnosis:

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 (ABSOLUTE THROTTLE POSITION,
%)
When throttle position sensor is at fully closed position,
throttle opening is indicated as 0 – 5% 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.

BATTERY CURRENT (for J20 engine, A):
This parameter indicates electric load value (consumed
current) detected by electric load current sensor.

BRAKE SW (ON/OFF)
This parameter indicates the state of the brake switch.

INTAKE TUNING SOL (INTAKE MANIFOLD TUNING
VALVE, ON/OFF):
ON: Command for intake manifold tuning valve being
output.
OFF: Command for intake manifold tuning valve not
being output.

FUEL SYSTEM (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 S2 (HEATED OXYGEN SENSOR-2,
V)
It indicates output voltage of HO2S-2 installed on
exhaust No.1 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.

Engine General Information and Diagnosis: 1A-42

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.

A/F B1 S1 CURRENT (A/F SENSOR OUTPUT
CURRENT, mA):
This parameter indicates output current of A/F sensor
installed on exhaust No.1 pipe (pre-catalyst).

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.

A/F B1 S1 ACT (A/F SENSOR, ACTIVE / INACTIVE):
This parameter indicates activation condition of A/F
sensor
ACTIVE: Activating
INACTIVE: warming up or at stop

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,

°) (for M16

engine)
It is calculated using the formula: target valve timing
advance – actual valve timing advance.

GENERATOR CONT DUTY (GENERATOR CONTROL
DUTY, %):
This parameter indicates generator control duty which
ECM uses to control amount of generated electricity of
generator
100%: No restriction applied to generation
0%: Maximum restriction applied to generation

GENERATOR FIELD DUTY (GENERATOR FIELD
COIL DUTY, %):
This parameter indicates operation rate (generation
condition) of generator using operation duty of generator
field coil.
100%: Maximum operation
0%: Minimum operation

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, small light or rear defogger ON signal
inputted.
OFF: Above electric loads all turned OFF.

1A-43 Engine General Information and Diagnosis:

PSP SWITCH (POWER STEERING PUMP PRESSURE
SWITCH, ON / OFF):
ON: PSP SW is ON (P/S high pressure switch is ON)
OFF: PSP SW is OFF (P/S high pressure switch is OFF)

RADIATOR COOLING FAN LOW (RADIATOR
COOLING FAN CONTROL RELAY NO.1, ON/OFF)
ON: Command for radiator cooling fan control relay No.1
operation being output.
OFF: Command for relay operation not being output.

RDTR FAN NO.1 HIGH (RADIATOR COOLING FAN
CONTROL RELAY NO.2, ON / OFF):
ON: Command for radiator cooling fan control relay No.2
which changes radiator cooling fan No.1 to high speed
operation being output.
OFF: Command for relay operation not being output

RDTR FAN NO.2 HIGH (RADIATOR COOLING FAN
CONTROL RELAY NO.3, ON / OFF)
ON: Command for radiator cooling fan control relay No.3
which changes radiator cooling fan No.2 to high speed
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 (ABSOLUTE ACCELERATOR
PEDAL POSITION, %)
When accelerator pedal is at fully released position,
accelerator pedal is indicated as 0 – 5% 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.

THROTTLE MOTOR RELAY (ON / OFF):
ON: Throttle actuator (motor) control activated by ECM.
OFF: Throttle actuator (motor) control stopped by ECM.

VEHICLE SPEED (km/h, mph)
It is computed based on pulse signals from rear wheel
speed sensor (RH, LH).

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).

Engine General Information and Diagnosis: 1A-44

Visual Inspection

S5JB0A1104008

Visually check the following parts and systems.

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 Description in Section 1J”

• Water pump belt – tension damage

“Engine 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 and Purge Valve Chamber
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