IG1 (SO2), SO2HT Circuit Inspection

NOTICE: 

Before disconnecting the PCM connector, jump the SCS line with the HDS, and wait more than 1 minute.

Test Procedure 

• Preparation
• • -

    Secondary HO2S (Sensor 2) connector (4P) : disconnected

  • -

    PCM connector A (50P) : disconnected

• Procedure
• • -

    Perform the inspection according to the following table.

(Disconnected) Secondary HO2S (Sensor 2) connector (4P) male terminals

(Disconnected) PCM connector A (50P) - Refer to: PCM Connector for Inputs and Outputs (1.5L Engine) or PCM Connector for Inputs and Outputs (2.0L Engine) (2024 2025) female terminals

IG Mode

Courtesy of HONDA, U.S.A., INC.

Courtesy of HONDA, U.S.A., INC.

Normal Conditions

IG1 (SO2) circuit inspection 

ON

12 V battery voltage [circuit type 1] 

SO2HT open wire inspection 

OFF

There is less than 1 Ohm 

Refer to the Open/Shorted Wire Inspection Description for the method to inspect the shorted circuit below, then start to inspect according to circumstances.

SO2HT shorted to ground inspection 

OFF

There is more than 1 MOhm 

Results 

• If abnormal, there is a problem in the circuit.

  If the power supply inspection of the above table showed abnormally, do the additional Power Supply Inspection , to locate the failure.