PINPOINT TEST G531332p10 : LEFT-HAND H02S SENSING CIRCUIT LOW/HIGH CURRENT, SLOW RESPONSE, ECM CONTROL MALFUNCTION

Pinpoint Tests

PINPOINT TEST G531332p10 : LEFT-HAND H02S SENSING CIRCUIT LOW/HIGH CURRENT, SLOW RESPONSE, ECM CONTROL MALFUNCTION

G531332t33 : CHECK THE H02S VARIABLE CIRCUIT FOR HIGH RESISTANCE
1. Key off.
2. Disconnect the H02S electrical connector, PI12.
3. Disconnect the ECM electrical connector, PI300.
4. Measure the resistance between:

HO2S connector PI12, ECM connector PI300,
harness side harness side
Pin 04 Pin 26

- Is the resistance greater than 5 ohms?

-> YES
REPAIR the high resistance circuit. CLEAR the DTC. TEST the system for normal operation.

-> NO
GO to Pinpoint Test G531332t34.

G531332t34 : CHECK THE H02S VARIABLE CIRCUIT FOR SHORT CIRCUIT TO POWER
1. Key on, engine off.
2. Measure the voltage between:

HO2S connector PI12, Battery
harness side
Pin 04 Negative terminal

- Is the voltage greater than 3 volts?

-> YES
REPAIR the short circuit. CLEAR the DTC. TEST the system for normal operation.

-> NO
GO to Pinpoint Test G531332t35.

G531332t35 : CHECK THE H02S VARIABLE CIRCUIT FOR SHORT CIRCUIT TO GROUND
1. Key off.
2. Measure the resistance between:

HO2S connector PI12, Battery
harness side
Pin 04 Negative terminal

- Is the resistance less than 10,000 ohms?

-> YES
REPAIR the short circuit. CLEAR the DTC. TEST the system for normal operation.

-> NO
GO to Pinpoint Test G531332t36.

G531332t36 : CHECK THE H02S CONSTANT CIRCUIT FOR HIGH RESISTANCE
1. Measure the resistance between:

HO2S connector PI12, ECM connector PI300,
harness side harness side
Pin 03 Pin 27

- Is the resistance greater than 5 ohms?

-> YES
REPAIR the high resistance circuit. CLEAR the DTC. TEST the system for normal operation.

-> NO
GO to Pinpoint Test G531332t37.

G531332t37 : CHECK THE H02S CONSTANT CIRCUIT FOR SHORT CIRCUIT TO POWER
1. Measure the voltage between:

HO2S connector PI12, Battery
harness side
Pin 03 Negative terminal

- Is the voltage greater than 3 volts?

-> YES
REPAIR the short circuit. CLEAR the DTC. TEST the system for normal operation.

-> NO
GO to Pinpoint Test G531332t38.

G531332t38 : CHECK THE H02S CONSTANT CIRCUIT FOR SHORT CIRCUIT TO GROUND
1. Measure the resistance between:

HO2S connector PI12, Battery
harness side
Pin 03 Negative terminal

- Is the resistance less than 10,000 ohms?

-> YES
REPAIR the short circuit. CLEAR the DTC. TEST the system for normal operation.

-> NO
INSTALL a new H02S. CLEAR the DTC. TEST the system for normal operation. If the DTC is repeated, refer to the warranty policy and procedures manual if an ECM is suspect.