Suzuki Grand Vitara JB627. Manual — part 25

1A-49 Engine General Information and Diagnosis:

LONG FT B1 (LONG TERM FUEL TRIM BANK-1, %)
LONG FT B2 (LONG TERM FUEL TRIM BANK-2, %)
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 (TOTAL FUEL TRIM BANK-1,
%) TOTAL FUEL TRIM B2 (TOTAL FUEL TRIM BANK-
2, %)
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 BANK-1
SENSOR-1 OUTPUT CURRENT, mA) A/F B2 S1
CURRENT (A/F SENSOR BANK-2 SENSOR-1
OUTPUT CURRENT, mA)
This parameter indicates output current of A/F sensor
installed on exhaust manifold (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 BANK-
1 SENSOR-2, ACTIVE / INACTIVE) O2S B2 S2 ACT
(HEATED OXYGEN SENSOR BANK-2 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 BANK-1 SENSOR-1,
ACTIVE / INACTIVE) A/F B2 S1 ACT (A/F SENSOR
BANK-2 SENSOR-1, 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.

FUEL PUMP (ON / OFF)
ON is displayed when ECM activates the fuel pump via
the fuel pump relay switch.

STARTER SW (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, clearance light or rear defogger ON
signal inputted.
OFF: Above electric loads all turned OFF.

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)

Engine General Information and Diagnosis: 1A-50

PNP SIGNAL (TRANSMISSION RANGE SENSOR, P/N
or D range):
Whether the transmission range switch (P/N position
switch) at P or N range or at R, D, 4, 3 or L range is
displayed. If at P or N range, “P/N range” is displayed
and if at R, D, 4, 3 or L range, “D” range is displayed.

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 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 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 B1 (FUEL INJECTION PULSE
WIDTH BANK-1, msec.)
INJ PULSE WIDTH B2 (FUEL INJECTION PULSE
WIDTH BANK-2, msec.)
This parameter indicates time of the injector drive (valve
opening) pulse which is output from ECM.

1A-51 Engine General Information and Diagnosis:

Engine Symptom Diagnosis

S6JB0B1104011

Perform troubleshooting referring to the following table when ECM has detected no DTC and no abnormality has been
found “Visual Inspection” in a nd “Engine Basic Check”.

Condition

Possible cause

Correction / Reference Item

Hard starting (Engine
cranks OK)

Faulty ECT sensor or MAF sensor

Refer to “Engine Coolant Temperature (ECT)
Sensor Inspection in Section 1C” or “Mass Air
Flow (MAF) and Intake Air Temperature (IAT)
Sensor On-Vehicle Inspection in Section 1C”.

Faulty ECM

Refer to “Inspection of ECM and Its Circuits”.

Low compression

Refer to “Compression Check in Section 1D”.

Compression leak from valve seat

Refer to “Valves and Valve Guides Inspection
in Section 1D”.