PINPOINT TEST G531332p9 : RIGHT-HAND CATALYST MONITOR SENSOR HEATER CONTROL CIRCUIT LOW/HIGH RESISTANCE

Pinpoint Tests

PINPOINT TEST G531332p9 : RIGHT-HAND CATALYST MONITOR SENSOR HEATER CONTROL CIRCUIT LOW/HIGH RESISTANCE

G531332t31 : CHECK THE POWER SUPPLY TO THE CATALYST MONITOR HEATER
1. Key off.
2. Disconnect the catalyst monitor sensor electrical connector, PI11.
3. Key on, engine off.
4. Make sure the O2S heater relay is engaged.
5. Measure the voltage between

Catalyst monitor sensor Battery
connector PI11, harness side
Pin 02 Negative terminal

- Is the voltage greater than 10 volts?

-> YES
GO to Pinpoint Test G531332t32.

-> NO
REPAIR the power supply circuit to the catalyst monitor sensor heater. This circuit includes the heater relay and fuse 33 of the front power distribution box. CLEAR the DTC. TEST the system for normal operation.

G531332t32 : CHECK THE CATALYST MONITOR 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 PI11, harness side harness side
Pin 02 Pin 88

- 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 manual if an ECM is suspect.