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