PINPOINT TEST G258127P9

Pinpoint Tests

PINPOINT TEST G258127p9 : DTC P0037, P0038; RIGHT-HAND CATALYST MONITOR SENSOR HEATER CONTROL CIRCUIT LOW/HIGH RESISTANCE

G258127t31 : CHECK THE POWER SUPPLY TO THE CATALYST MONITOR HEATER
1. Disconnect the catalyst monitor sensor electrical connector, PI11.
2. Turn the ignition switch to the ON position.
3. Make sure the O2S heater relay is engaged.
4. Measure the voltage between PI11, pin 01 (WG) and GROUND.

- Is the voltage greater than 10 volts?

->YES
GO to Pinpoint Test G258127t32.

->NO
REPAIR the power supply circuit to the catalyst monitor sensor heater. This circuit includes the 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.

G258127t32 : CHECK THE CATALYST MONITOR HEATER CONTROL CIRCUIT FOR HIGH RESISTANCE
1. Disconnect the battery negative terminal.
2. Disconnect the ECM electrical connector, PI01.
3. Measure the resistance between PI11, pin 02 (UY) and PI01, pin 92 (UY).

- Is the resistance greater than 5 Ohms?

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

->NO
INSTALL a new catalyst monitor sensor. CLEAR the DTC. TEST the system for normal operation. If the DTC is repeated, contact dealer technical support for advice on possible ECM failure.