Suzuki Grand Vitara JB416 / JB420 / JB419. Manual - part 114

1C-16 Engine Electrical Devices: For Petrol Engine Model

6) Turn ON ignition switch and check MAF signal 

voltage between “C37-26” terminal circuit and “C37-
27” terminal circuit of special tool.

MAF signal voltage between “C37-26” terminal 
circuit and “C37-27” terminal circuit of special 
tool
MAF signal voltage of MAF and IAT sensor with 
ignition switch turned ON: 0.5 – 1.0 V

7) Start engine and check that voltage is lower than 5 V 

and it rises as engine speed increases.

MAF signal voltage between “C37-26” terminal 
circuit and “C37-27” terminal circuit of special 
tool
MAF signal reference voltage of MAF and IAT 
sensor at specified Idle speed: 1.3 – 1.8 V

8) If check result is not as specified above, cause may 

lie in wire harness, connector connection, MAF and 
IAT sensor or ECM.

Mass Air Flow (MAF) and Intake Air 
Temperature (IAT) Sensor Removal and 
Installation

S6JB0A1316020

CAUTION

!

 

• Do not disassemble MAF and IAT sensor.
• Do not expose MAF and IAT sensor to any 

shock.

• Do not clean MAF and IAT sensor.
• If MAF and IAT sensor has been dropped, it 

should be replaced.

• Do not blow compressed air by using air 

gun or the like.

• Do not put finger or any other object into 

MAF and IAT sensor. Malfunction may 
occur.

 

Removal

1) Disconnect negative cable at battery.
2) Disconnect MAF and IAT sensor connector.
3) Remove MAF and IAT sensor (1) from air cleaner 

case.

Installation
Reverse removal procedure noting the followings.
• Tighten MAF and IAT sensor screws to specified 

torque.

Tightening torque
MAF and IAT sensor screw (a):  1.5 N·m (0.15 kgf-
m, 1.1 lb-ft)

• Connect MAF and IAT sensor connector securely.

1. ECM

“C37-27”

“C37-26”

1

I4RS0A130009-01

1

I5JB0A130033-02

(a)

I5JB0A130034-02

Engine Electrical Devices: For Petrol Engine Model 1C-17

Mass Air Flow (MAF) and Intake Air 
Temperature (IAT) Sensor Inspection

S6JB0A1316021

CAUTION

!

 

Do not heat up MAF and IAT sensor more 
than 100 

°C (212 °F). Otherwise, MAF and IAT 

sensor will be damaged.

 

• Check sensor O-ring (1) for damage and 

deterioration. Replace as necessary.

• Blow hot air to temperature sensing part (2) of MAF 

and IAT sensor (3) using hot air drier (4) and measure 
resistance between sensor terminals while heating air 
gradually.
If measured resistance does not show such 
characteristic as shown, replace MAF and IAT sensor.

Intake air temperature sensor resistance
–20 

°C (–4 °F): 13.6 – 18.4 kΩ

20 

°C (68 °F): 2.21 – 2.69 kΩ

60 

°C (140 °F): 0.493 – 0.667 kΩ

Vacuum Tank Assembly Inspection (For J20 
Engine)

S6JB0A1316022

CAUTION

!

 

Do not apply vacuum more than –86 kPa (– 
12.47 psi); otherwise intake manifold tuning 
vacuum solenoid valve and vacuum tank 
could be damaged.

 

Intake manifold tuning vacuum solenoid valve

1) With ignition switch OFF, disconnect connector from 

vacuum solenoid valve.

2) Check resistance of intake manifold tuning vacuum 

solenoid valve.
If resistance is as specified, proceed to next 
operation check. If not, replace intake manifold 
tuning vacuum solenoid valve.

Resistance of intake manifold tuning vacuum 
solenoid valve
Between two terminals: 33 – 39 

Ω at 20 °C (68 °F)

3) Disconnect vacuum hoses (1 and 2) from intake 

manifold tuning valve and vacuum tank.

4) With connector disconnected, apply vacuum (–53 

kPa (– 7.69 psi) to –67 kPa (–9.72 psi)) to hose (2).
Vacuum is maintained.

[A]: Lower limit
[B]: Nominal

[C]: Upper limit
[D]: Resistance

[E]: Temperature

5. Temperature gauge

20

0

68

32

104

140

176

40

60

80

(2.45)

(0.58)

1

2

3

4

5

[A]

[B]

[E]

[C]

[D]

I4RS0A130012-01

I5JB0A130005-01

1

2

I5JB0A130006-01

1C-18 Engine Electrical Devices: For Petrol Engine Model

5) With connector disconnected, apply vacuum to hose 

(1). Air goes into nozzle (2).

6) Connect 12 V-battery to intake manifold tuning 

vacuum solenoid valve terminals. In this state, apply 
vacuum to hose (2). Air goes into hose (1).
If check result is not as described, replace intake 
manifold tuning vacuum solenoid valve.

7) Connect vacuum hoses to intake manifold tuning 

valve and vacuum tank.

8) Connect intake manifold tuning vacuum solenoid 

valve connector securely.

Vacuum Tank

1) Check outside of vacuum tank for damage visually.
2) Disconnect vacuum hoses from intake manifold and 

intake manifold tuning vacuum solenoid valve.

3) Check vacuum passage of vacuum tank for clog and 

leakage as follows by using vacuum pump.
a) When applying vacuum (– 53 kPa (– 7.69 psi) to 

– 67 kPa (–9.72 psi)) to hose (1), vacuum is 
maintained (there is no leakage): [A]

b) When applying vacuum to hose (2), vacuum is 

not maintained: [B]
If check result is not described, replace vacuum 
tank assembly.

4) Connect vacuum hoses to intake manifold and intake 

manifold tuning vacuum solenoid valve.

2

1

I5JB0A130007-01

2

1

I5JB0A130008-01

[B]

2

[A]

1

I5JB0A130009-01

Engine Electrical Devices: For Petrol Engine Model 1C-19

Electric Load Current Sensor On-Vehicle 
Inspection (For J20 Engine)

S6JB0A1316023

Using SUZUKI Scan Tool

1) Connect scan tool to DLC with ignition switch turned 

OFF.

2) Check “Battery Current” displayed on scan tool at 

following condition.

Battery current
Ignition switch ON: 5.0 – 6.0 A
Run engine at 2000 rpm, headlight ON: 19.0 – 23.0 A
Run engine at 2000 rpm, headlight ON and blower 
motor switch is HI position: 37.0 – 42.0 A

If check result is satisfactory, electric load current sensor 
is in good condition.
If check result is not satisfactory, check the following 
parts and circuit.
• Electric load current sensor circuit (power, ground and 

output)

• Following charging system components

– Battery (refer to “Battery Inspection: For Petrol 

Engine Model in Section 1J”)

– Generator (refer to “Generator Inspection: For 

Petrol Engine Model in Section 1J”)

– Generator output control circuit (refer to “Generator 

Test (Undercharged Battery Check): For Petrol 
Engine Model in Section 1J”)

– Generator field coil monitor circuit (refer to 

“Generator Inspection: For Petrol Engine Model in 
Section 1J”)

If electric load current sensor circuit and charging 
system is in good condition, electric load current sensor 
is faulty.

Without Using SUZUKI Scan Tool

1) Measure sensor voltage between “C37-9” terminal of 

ECM connector and vehicle body ground referring to 
“Inspection of ECM and Its Circuits: For Petrol 
Engine Model in Section 1A”.
If check result is satisfactory, electric load current 
sensor is in good condition.
If check result is not satisfactory, check the following 
parts and circuit.
• Electric load current sensor circuit (power, ground 

and output)

• Following charging system components

– Battery (refer to “Battery Inspection: For Petrol 

Engine Model in Section 1J”)

– Generator (refer to “Generator Inspection: For 

Petrol Engine Model in Section 1J”)

– Generator output control circuit (refer to 

“Generator Test (Undercharged Battery Check): 
For Petrol Engine Model in Section 1J”)

– Generator field coil monitor circuit (refer to 

“Generator Inspection: For Petrol Engine Model 
in Section 1J”)

If electric load current sensor circuit and charging 
system is in good condition, electric load current 
sensor is faulty.

Electric Load Current Sensor Removal and 
Installation (For J20 Engine)

S6JB0A1316024

Removal

1) Remove battery from vehicle referring to “Battery 

Dismounting and Remounting: For Petrol Engine 
Model in Section 1J”.

2) Detach fuse box No.1 (1) from its bracket.

1

I5JB0A130010-02