Typical Malfunction Thresholds

Total OBD & ECU Auto Diagnostics

Total OBD & ECU Auto Diagnostics

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P0037:

Heated oxygen sensor heater current during intrusive heating

Less than 0.3 A

PGG3B Case 1:

Heated oxygen sensor heater current

More than 2 A

PGG3B Case 2:

Heated oxygen sensor heater current during intrusive heating

2 A or more

COMPONENT OPERATING RANGE

Heated Oxygen (HO2) sensor heater current

0.4 to 1 A (when engine idles, HO2 sensor warmed up and battery voltage 11 to 14 V)

WIRING DIAGRAM

Refer to DTC P0136 (See page ES-133).

HINT:

• If other DTCs relating to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit.

• Read freeze frame data using a intelligent tester. Freeze frame data record the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data, from the time the malfunction occurred.

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