Suzuki Grand Vitara JB416 / JB420. Manual — part 79

1C-1 Engine Electrical Devices:

Engine

Engine Electrical Devices

Repair Instructions

Engine Control Module (ECM) Removal and
Installation

S5JB0A1306004

CAUTION

!

As ECM consists of precision parts, be
careful not to expose it to excessive shock.

Removal

1) Disconnect negative cable at battery.
2) Remove ECM cover.
3) Disconnect connectors from ECM as follows.

a) Push lock (1) to release locking of lock lever (2).
b) Turn lock lever to arrow direction until it stops.

4) Remove ECM (1) from its bracket by removing its

mounting bolts (2).

Installation
Reverse removal procedure noting the following:
• Connect connectors to ECM as follows.

a. Make sure that lock lever of ECM connector is

unlock position.

b. Insert ECM connectors to ECM until it stops with

unlocked lock lever.

c. Lock ECM connectors securely by pulling its lock

lever up.

Manifold Absolute Pressure (MAP) Sensor
Inspection

S5JB0A1306005

1) Disconnect connector from MAP sensor.
2) Remove MAP sensor from intake manifold.
3) Arrange 3 new 1.5 V batteries (2) in series (check

that total voltage is 4.5 – 5.0 V) and connect its
positive terminal to “Vin” terminal of sensor and
negative terminal to “Ground” terminal. Then check
voltage between “Vout” and “Ground”. Also, check if
voltage reduces when vacuum is applied up to 400
mmHg by using vacuum pump (3).
If check result is not satisfactory, replace MAP
sensor (1).

Output voltage (When input voltage is 4.5 – 5.5 V,
ambient temp. 20 – 30

°C, 68 – 86 °F)

1

2

I4RS0A130003-01

1

2

2

2

I5JB0A130012-03

I4RS0B130021-01

Altitude

(Reference)

Barometric pressure

Output

voltage

(ft)

(m)

(mmHg)

(kPa)

(V)

0 – 2000

0 – 610

760 – 707 100 – 94 3.3 – 4.3

2001 –

5000

611 –

1524

Under 707

over 634

94 – 85

3.0 – 4.1

5001 –

8000

1525 –

2438

Under 634

over 567

85 – 76

2.7 – 3.7

8001 –

10000

2439 –

3048

Under 567

over 526

76 – 70

2.5 – 3.3

I4RS0B130022-01

I4RS0A130004-01

Engine Electrical Devices: 1C-2

4) Install MAP sensor securely.
5) Connect MAP sensor connector securely.

Electric Throttle Body Assembly On-Vehicle
Inspection

S5JB0A1306022

WARNING

!

Never touch throttle valve with finger while
ignition switch is turned ON and accelerator
pedal is depressed. Otherwise, injury may
result by pinching the finger between throttle
valve and throttle body housing.

CAUTION

!

• Do not disassemble electric throttle body

assembly.

• Do not expose electric throttle body

assembly to excessive shock like a
dropping it. If electric throttle body
assembly has been exposed to excessive
shock, it should be replaced.

• Be careful not to accrete a foreign material

(like dust and/or metallic particle) to the
throttle body housing and/or throttle valve.
Otherwise, the throttle body assembly is
breaking down by throttle valve accretion.

• Do not apply excessive moving force to

throttle valve for throttle valve operation
check and/or TP sensor performance
check.
Otherwise, the throttle body assembly is
breaking down by damaging the internal
resinous gear of throttle valve actuator.

Throttle Valve Visual Check

1) Remove air cleaner outlet hose (for J20 engine) or

air intake pipe (for M16 engine).

2) Check that there isn’t any foreign matter caught

between throttle valve and throttle body housing. If
there is, take it out after removing throttle body
referring to “Electric Throttle Body Assembly
Removal and Installation: For J20 Engine in Section
1D” or “Electric Throttle Body Assembly Removal
and Installation: For M16A Engine with VVT in
Section 1D”and clean inside of throttle body
thoroughly.

Throttle Valve Operation Check

1) Remove air cleaner outlet hose (for J20 engine) or

air intake pipe (for M16 engine).

2) Turn OFF ignition switch.
3) Move throttle valve with finger to its full open position

and check that it moves smoothly.

4) Move throttle valve with finger to its completely

closed position and check that it moves smoothly.

5) Take off finger from throttle valve (1) which is at full

open position and check that it moves smoothly by
its return spring and open spring force back to
default position (position where throttle valve is open
by 7

° (2) from completely closed position).

6) Take off finger from throttle valve (1) which is at

completely closed position and check that it moves
smoothly by its return spring and open spring force
back to default position.

If check result is not satisfactory, replace electric
throttle body assembly.

4. Voltmeter

I3RM0A130005-01

I5JB0A130013-01

1

2

I5JB0A130035-01

1C-3 Engine Electrical Devices:

Electric Throttle Body Assembly Operation Check

1) Remove air cleaner outlet hose (for J20 engine) or

air intake pipe (for M16 engine).

2) Turn ON ignition switch.
3) Depress accelerator pedal gradually and check that

throttle valve moves smoothly until it opens fully.

4) Release accelerator pedal depressed in Step 3) and

check that throttle valve (1) moves back to default
position (position where throttle valve is open by 7

°

(2) from its completely closed position).

If check result is satisfactory, electric throttle body
system is in good condition. If check result is not
satisfactory, proceed to next step.

5) Perform “Accelerator Pedal Position (APP) Sensor

Assembly On-Vehicle Inspection”, “Throttle Actuator
(Motor) Check” and “Throttle Position Sensor
Performance Check”.
If check results are not satisfactory, replace electric
throttle body assembly.
If check results are satisfactory, wire circuit and/or
ECM are faulty.

Throttle Actuator (Motor) Check

1) Turn OFF ignition switch.
2) Disconnect connector from electric throttle body

assembly.

3) Measure resistance between “M1” terminal (1) and

“M2” terminal (2) of electric throttle body assembly.
If measured resistance is out of specified value,
replace electric throttle body assembly.

Throttle actuator (motor) resistance
0.3 – 100

Ω at 20 °C, 68 °F

Throttle Position Sensor Performance Check

1) Remove air cleaner outlet hose (for J20 engine) or

air intake pipe (for M16 engine).

2) Turn OFF ignition switch.
3) Disconnect connector from electric throttle body

assembly.

4) Check throttle position sensor (main and sub) output

voltage as following steps.
a) For throttle position sensor (main), arrange 3

new 1.5 V batteries (1) in series (check that total
voltage is 4.5 – 5.0 V) and connect its positive
terminal to “Vin” terminal (2) and negative
terminal to “Ground” terminal (3) of sensor. Then
using voltmeter, connect positive terminal to
“Vout 1” terminal (4) of sensor and negative
terminal to battery.

[A]: For J20 engine
[B]: For M16 engine

1

2

I5JB0A130035-01

1

2

1

2

[B]

[A]

I5JB0A130014-01

[A]: For J20 engine
[B]: For M16 engine

1

4

2

3

1

4

2

3

[A]

[B]

I5JB0A130015-02

Engine Electrical Devices: 1C-4

b) For throttle position sensor (sub), arrange 3 new

1.5 V batteries (1) in series (check that total
voltage is 4.5 – 5.0 V) and connect its positive
terminal to “Vin” terminal (2) and negative
terminal to “Ground” terminal (3) of sensor. Then
using voltmeter, connect positive terminal to
“Vout 2” terminal (4) of sensor and negative
terminal to battery.

c) Measure output voltage variation while throttle

valve is opened and closed as following
specification.

If sensor voltage is out of specified value and linear
variation as the following graph, replace electric throttle
body assembly.

Throttle position sensor output voltage
Throttle position sensor (main) [A]: 0.45 – 4.88 V,
varying according to throttle valve opening by finger
(Voltage should vary by 0.04 V for each 1

° valve

opening)
Throttle position sensor (sub) [B]: 1.33 – 5.007 V,
varying according to throttle valve opening by finger
(Voltage should vary by about 0.032 V for each 1

°

valve opening)

Electric Throttle Body System Calibration

S5JB0A1306023

NOTE
If the service described under the
“Precautions of Electric Throttle Body
System Calibration in Section 1A” is
performed, calibrate electric throttle body
system as follows.

1) If electric throttle body assembly and/or accelerator

pedal position (APP) sensor assembly are replaced,
perform following steps.
a) Disconnect negative cable at battery for 20

seconds or more for the purpose of clearing
calibration data of closed throttle position from
memory in ECM.

b) Connect negative cable to battery.

2) Keep ignition switch at ON position for 5 seconds or

more without running engine.

[A]: For J20 engine
[B]: For M16 engine

1

3

2

4

1

3

2

4

[A]

[B]

I5JB0A130016-02

[C]: Throttle position sensor (main) output voltage
[D]: Throttle position sensor (sub) output voltage

[E]: Throttle valve opening

[F]: Position where throttle valve is open by 7

° from completely closed

position (default position)

[G]: Angle obtained when accelerator pedal is depressed fully (84

°)

[H]: Angle obtained when throttle valve is fully opened with finger (96

°)

[B]

[A]

[D]
(V)

[C]
(V)

[F]

[G]

[E]

0.45 - 0.75

0.724 - 1.036

3.675 - 4.245

4.000 - 4.880

1.33 - 1.63

1.604 - 1.916

3.883 - 4.453

4.097 - 5.007

[H]

[F]

[G]

[H]

I5JB0A130017-02