Engine Coolant Temperature (Ect) Sensor Inspection; Air Fuel Ratio (A/F) Sensor On-Vehicle Inspection - Suzuki GRAND VITARA Owner's Manual

1C-7 Engine Electrical Devices:
Installation
Reverse removal procedure noting the following.
• Clean mating surfaces of ECT sensor and water outlet
cap.
• Check O-ring for damage and replace, if necessary.
• Tighten ECT sensor (1) to specified torque.
Tightening torque
ECT sensor (a): 12.5 N·m (1.25 kgf-m, 9.0 lb-ft)
[A]
1, (a)
[A]: For J20 engine
[B]: For M16 engine
• Connect connector to ECT sensor securely.
• Refill coolant referring to "Cooling System Flush and
Refill: in Section 1F".
Engine Coolant Temperature (ECT) Sensor
Inspection
Immerse temperature sensing part of ECT sensor in
water (or ice) and measure resistance between sensor
terminals while heating water gradually.
If measured resistance doesn't show such characteristic
as shown, replace ECT sensor.
[D]
[C]
2.29 - 2.62
[A]
0.309 - 0.331
0 20
32 68
[A]: Lower limit
[B]: Normal
[C]: Upper limit
[B]
1, (a)
I5JB0A130023-02
S5JB0A1306009
[B]
40 60 80
104 140 176
[E]
I5JB0A130037-01
[D]: Resistance
[E]: Temperature
Air Fuel Ratio (A/F) Sensor On-Vehicle
Inspection
Heater
1) Disconnect A/F sensor connector.
2) Using ohmmeter, measure resistance of Sensor
heater between terminals "V
connector. If found faulty, replace A/F sensor.
NOTE
Temperature of sensor affects resistance
value largely. Make sure that sensor heater is
at correct temperature.
A/F sensor heater resistance
2 – 3 Ω at 20 °C (68 °F)
Viewed from terminal side
"GND"
3) Connect A/F sensor connector securely.
Adjusting Resistor
1) Disconnect A/F sensor connector.
2) Using ohmmeter, measure resistance of adjusting
resistor between terminals "R+" and "R–" at A/F
sensor connector.
If found faulty, replace A/F sensor.
Adjusting resistor resistance
100 – 58000 Ω at 20 °C (68 °F)
Viewed from terminal side
3) Connect A/F sensor connector securely.
S5JB0A1306028
" and "GND" at sensor
B
"V "
B
I5JB0A130001-02
"R+" "R−"
I5JB0A130002-02