PINPOINT TEST G258127P7

Pinpoint Tests

PINPOINT TEST G258127p7 : DTC P0031, P0032; RIGHT-HAND H02S HEATER CONTROL CIRCUIT HIGH/LOW CURRENT

G258127t23 : CHECK H02S HEATER POWER SUPPLY CIRCUIT
1. Disconnect the H02S electrical connector, PI10.
2. Turn the ignition switch to the ON position.
3. Make sure the O2S heater relay is engaged.
4. Measure the voltage between PI10, pin 01 (WG) and GROUND.

- Is the voltage greater than 10 volts?

->YES
GO to Pinpoint Test G258127t24.

->NO
REPAIR the power supply circuit to the H02S heater. This circuit includes the HO2S heater relay, fuse 34 of the front power distribution box, and the high power protection module. CLEAR the DTC. TEST the system for normal operation.

G258127t24 : CHECK H02S HEATER CONTROL CIRCUIT FROM ECM FOR HIGH RESISTANCE
1. Disconnect the battery negative terminal.
2. Disconnect the ECM electrical connector, PI01.
3. Measure the resistance between PI01, pin 01 (RU) and PI10, pin 02 (RU).
4. Measure the resistance between PI01, pin 02 (RU) and EM21, pin 02 (RU).

- Is either 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 G258127t25.

G258127t25 : CHECK H02S HEATER CONTROL CIRCUIT FROM ECM FOR SHORT TO HIGH VOLTAGE
1. Reconnect the battery negative terminal.
2. Turn the ignition switch to the ON position.
3. Measure the voltage between PI10, pin 02 (RU) and GROUND.

- Is the voltage greater than 3 volts?

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

->NO
GO to Pinpoint Test G258127t26.

G258127t26 : CHECK H02S HEATER CONTROL CIRCUIT FROM ECM FOR SHORT TO GROUND
1. Turn the ignition switch to the OFF position.
2. Measure the resistance between PI10, pin 02 (RU) and GROUND.

- Is the resistance less than 10,000 Ohms?

->YES
REPAIR the short circuit to GROUND. 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, contact dealer technical support for advice on possible ECM failure.