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EC-850
[QR (WITHOUT EURO-OBD)]
HO2S1 HEATER
Specification data are reference values and are measured between each terminal and ground.
Pulse signal is measured by CONSULT-II.
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.
: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
Diagnostic Procedure BBS001TC
1. CHECK OVERALL FUNCTION
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Turn ignition switch ON.
4. Set tester prove between ECM terminal 24 (HO2S1 heater signal) and ground.
5. Start engine and let it idle.
6. Check the voltage under the following conditions.
Verify that the oscilloscope screen shows the signal waves as
shown below.
: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
OK or NG
OK >> INSPECTION END
NG >> GO TO 2.
TER-
MINAL
NO.
WIRE
COLOR
ITEM CONDITION DATA (DC Voltage)
24 G/W
Heated oxygen sen-
sor 1 heater
[Engine is running]
● Warm-up condition.
● Engine speed is below 3,600 rpm
Approximately 7.0V
[Engine is running]
● Engine speed is above 3,600 rpm
BATTERY VOLTAGE
(11 - 14V)
PBIB0519E
Conditions Voltage
At idle
Approximately 7.0V
Engine speed is above 3,600 rpm.
BATTERY VOLTAGE
(11 - 14V)
MBIB0038E
PBIB0519E
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