Engine Electrical Devices: 1C-7
Installation
Reverse removal procedure noting the following.
• Clean mating surfaces of ECT sensor and thermostat
case.
• Check O-ring for damage and replace, if necessary.
• Tighten ECT sensor (1) to specified torque.
Tightening torque
ECT sensor (a): 15 N·m (1.5 kgf-m, 11.0 lb-ft)
• Connect connector to ECT sensor securely.
• Refill coolant referring to “Cooling System Flush and
Refill in Section 1F”.
ECT Sensor Inspection
S7RS0B1306009
Immerse temperature sensing part of ECT sensor (1) 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.
HO2S-1 and HO2S-2 Heater On-Vehicle
Inspection
S7RS0B1306010
1) Disconnect sensor connector.
2) Using ohmmeter, measure resistance between
terminals “V
B
” and “GND” of sensor connector.
If found faulty, replace oxygen sensor.
NOTE
Temperature of sensor affects resistance
value largely. Make sure that sensor heater is
at correct temperature.
Resistance of oxygen sensor heater
HO2S-1: 5.0 – 6.4 Ω at 20 °C (68 °F)
HO2S-2: 11.7 – 14.5 Ω at 20 °C (68 °F)
Viewed from terminal side
3) Connect sensor connector securely.
HO2S-1 and HO2S-2 Removal and Installation
S7RS0B1306011
Removal
WARNING
!
To avoid danger of being burned, do not
touch exhaust system when system is hot.
Oxygen sensor removal should be performed
when system is cool.
1) Disconnect negative (–) cable at battery.
2) Disconnect connector of heated oxygen sensor and
release its wire harness from clamps.
3) Perform following items before removing heated
oxygen sensor.
a) For HO2S-1, remove exhaust manifold referring
to “Exhaust Manifold Removal and Installation in
Section 1K”, if necessary.
b) For HO2S-2, hoist vehicle.
4) Remove heated oxygen sensor from exhaust pipe or
exhaust manifold.
[A]: Lower limit [D]: Resistance
[B]: Normal [E]: Temperature
[C]: Upper limit
1,(a)
I2RH0B130009-01
200
6832 104 140 176
40 60 80
[E]
2.29 - 2.62
0.309 - 0.331
[A]
[B]
[C]
[D]
I5JB0A130037-01
[A]: HO2S-1 [B]: HO2S-2
I4RS0A130006-01
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