P0135

System Description
The ECM performs ON/OFF control of the heated oxygen sensor 1 heaters (front) corresponding to the engine speed.

Operation:

Consult-II Reference Value In Data Monitor Mode:

ECM Terminals And Reference Value:

On Board Diagnosis Logic
Malfunction is detected when the current amperage in the heated oxygen sensor 1 heater (front) circuit is out of the normal range. [An improper voltage drop signal is sent to ECM through the heated oxygen sensor 1 heater (front).]

POSSIBLE CAUSE
- Harness or connectors
[The heated oxygen sensor 1 heater (front) circuit is open or shorted.]
- Heated oxygen sensor 1 heater (front)

DTC Confirmation Procedure

NOTE: If "DTC Confirmation Procedure" has been previously conducted, always turn ignition switch OFF and wait at least 5 seconds before conducting the next test.

TESTING CONDITION: Before performing the following procedure, confirm that battery voltage is between 10.5 V and 16 V at idle.

With CONSULT-II
1. Turn ignition switch ON and select "DATA MONITOR" mode with CONSULT-II.




2. Start engine and run it for at least 6 seconds at idle speed.
3. If 1st trip DTC is detected, go to "Diagnostic Procedure" below.

With GST
1. Start engine and run it for at least 6 seconds at idle speed.
2. Turn ignition switch OFF, wait at least 5 seconds and then turn ON.
3. Start engine and run it for at 6 seconds at idle speed.
4. Select "MODE 3" with GST.
5. If 1st trip DTC is detected, go to "Diagnostic Procedure" below.
- When using GST, "DTC Confirmation Procedure" should be performed twice as much as when using CONSULT-II because GST cannot display MODE 7 (1st trip DTC) concerning this diagnosis. Therefore, using CONSULT-II is recommended.

EC-O2H1B1-01:

EC-O2H1B1-01 Connector View:

Wiring Diagram

Diagnostic Procedure

Steps 1 - 2:

Steps 3 - 4:

Steps 5 - 6: