PINPOINT TEST G542831P14

PINPOINT TEST G542831p14 : LEFT-HAND CATALYST MONITOR SENSOR HEATER CONTROL CIRCUIT LOW/HIGH RESISTANCE

G542831t50 : CHECK THE POWER SUPPLY TO THE CATALYST MONITOR SENSOR HEATER
1. Disconnect the catalyst monitor sensor electrical connector, PI13.
2. Key on, engine off.
3. Make sure the O2S heater relay is energized.
4. Measure the voltage between:

Catalyst monitor sensor Battery
connector PI13, harness side
Pin 01 Negative terminal

- Is the voltage greater than 10 volts?

-> YES
GO to Pinpoint Test G542831t51.

-> NO
REPAIR the power supply circuit to the catalyst monitor sensor heater. This circuit includes the heater relay and fuse 35 of the front power distribution box. CLEAR the DTC. TEST the system for normal operation.

G542831t51 : CHECK THE CATALYST MONITOR SENSOR HEATER CONTROL CIRCUIT FOR HIGH RESISTANCE
1. Key off.
2. Disconnect the ECM electrical connector, PI300.
3. Measure the resistance between:

Catalyst monitor sensor ECM connector PI300,
connector PI13, harness side harness side
Pin 02 Pin 89

- 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, refer to the warranty policy and procedures if an ECM is suspect.