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EC-778
[QR (WITHOUT EURO-OBD)]
HO2S2 HEATER
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
Diagnostic Procedure EBS0113D
1. CHECK OVERALL FUNCTION
1. Start engine and warm it up to the normal operating temperature.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
4. Let engine idle for 1 minute.
5. Set voltmeter proves between ECM terminal 2 (HO2S2 heater signal) and ground.
6. Check the voltage under the following conditions.
OK or NG
OK >> INSPECTION END
NG >> GO TO 2.
TER-
MINAL
NO.
WIRE
COLOR
ITEM CONDITION DATA (DC Voltage)
2PU/R
Heated oxygen sensor 2
heater
[Engine is running]
● Engine speed: Below 3,600 rpm after the follow-
ing conditions are met
– Warm-up condition
– Keeping the engine speed between 3,500 and
4,000 rpm for 1 minute and at idle for 1 minute
under no load
0 - 1.0V
[Ignition switch: ON]
● Engine stopped
[Engine is running]
● Engine speed is above 3,600 rpm
BATTERY VOLTAGE
(11 - 14V)
Conditions Voltage
At idle 0 - 1V
Engine speed is above 3,600 rpm Battery voltage
PBIB0673E
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