IGPS(LAF) [IG(LAF_O2)], AFHT Circuit Inspection - For DTC P0155: IGPS(LAF) [IG(LAF_O2)], AFTHB2

NOTICE: 

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

Test Procedure 

• Preparation
• • -

    Front A/F sensor (Bank 2, Sensor 1) 6P connector: disconnected

  • -

    Power distribution module connector D (4P): disconnected

  • -

    PCM connector E (80P): disconnected

• Procedure
• • -

    Perform the inspection according to the following table.

(Disconnected) Front A/F sensor (Bank 2, Sensor 1) 6P connector female terminals

(Disconnected) Power distribution module connector D (4P) female terminals

IG Mode

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

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

Normal Conditions

IGPS(LAF) [IG(LAF_O2)] 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.

IGPS(LAF) [IG(LAF_O2)] shorted to ground inspection 

OFF

Not shorted 

(Disconnected) Front A/F sensor (Bank 2, Sensor 1) 6P connector female terminals

(Disconnected) PCM connector E (80P) - Refer to: PCM Connector for Inputs and Outputs (3.0L Engine) (2022 2023 2024) or PCM Connector for Inputs and Outputs (3.5L Engine) (2022 2023 2024) or PCM Connector for Inputs and Outputs (3.5L Engine) (2025) or PCM Connector for Inputs and Outputs (3.0L Engine) (2025) female terminals

IG Mode

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

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

Normal Conditions

AFTHB2 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.

AFTHB2 shorted to ground inspection 

OFF

Not shorted 

Results 

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