P0031

E : DTC P0031, P0032. RIGHT-HAND BANK HO2S HEATER

E1 : CHECK THE POWER SUPPLY CIRCUIT TO THE RIGHT-HAND BANK HO2S HEATER

1. Disconnect HO2S sensor electrical connector, EN37.
2. Turn the ignition switch to the ON position.
3. Measure the voltage between the HO2S electrical connector EN37, pin 2 (WG) and GROUND.

Is the voltage less than 10 volts?
Yes
Goto E5

No
Goto E2

E2 : CHECK THE GROUND CIRCUIT TO THE RIGHT-HAND BANK HO2S HEATER FOR OPEN CIRCUIT

1. Turn the ignition switch to the OFF position.
2. Disconnect the PCM electrical connector EN16.
3. Measure the resistance between the HO2S electrical connector EN37, pin 1 (RU) and the PCM electrical connector EN16, pin 1 and pin 2 (RU).

Is the resistance of each wire less than 5 ohms?
Yes
Goto E3

No
REPAIR the circuit. For additional information, refer to the wiring diagrams. CLEAR the DTCs. TEST the system for normal operation.

E3 : CHECK THE RIGHT-HAND BANK HO2S GROUND CIRCUIT FOR SHORT TO GROUND

1. Measure the resistance between the bank 1 HO2S electrical connector EN37, pin 1 (RU) and GROUND.

Is the resistance less than 10,000 ohms?
Yes
REPAIR the short to GROUND. For additional information, refer to the wiring diagrams. CLEAR the DTCs. TEST the system for normal operation.

No
Goto E4

E4 : CHECK THE RIGHT-HAND BANK HO2S GROUND CIRCUIT FOR SHORT TO BATTERY

1. Check for a voltage between the HO2S electrical connector EN37, pin 1 (RU) and GROUND.

Is the voltage greater than 1 volt?
Yes
REPAIR the short to battery. For additional information, refer to the wiring diagrams. CLEAR the DTCs. TEST the system for normal operation.

No
INSTALL a new HO2S. CLEAR the DTCs. TEST the system for normal operation. If the DTC is repeated, INSTALL a new PCM. Before replacing a PCM, contact Dealer technical support.

E5 : CHECK FUSE 38 OF THE ENGINE COMPARTMENT FUSE BOX

1. Check the fuse.

Is the fuse OK?
Yes
Goto E7

No
Goto E6

E6 : CHECK FUSE 38 OF THE ENGINE COMPARTMENT FUSE BOX FOR A SHORT TO GROUND

1. Measure the resistance between electrical connector JB34 pin 97 of the engine compartment fuse box and GROUND.

Is the resistance less than 10,000 ohms?
Yes
REPAIR short to ground between the engine compartment fuse box and the right-hand bank HO2S. For additional information, refer to the wiring diagrams. CLEAR the DTC. TEST the system for normal operation.

No
INSTALL a new fuse. CLEAR the DTC. TEST the system for normal operation.

E7 : CHECK THE POWER SUPPLY TO FUSE 38 IN THE ENGINE COMPARTMENT FUSE BOX

1. Turn the ignition switch to the ON position.
2. Measure the voltage between electrical connector JB34 pin 131 and GROUND.

Is the voltage less than 10 volts?
Yes
REPAIR the circuit between the battery and the EMS relay. Test the relay, renew as necessary. CLEAR the DTC. TEST the system for normal operation.

No
REPAIR the circuit from the PCM control relay to the engine compartment fuse box. For additional information, refer to the wiring diagrams.
Goto P1
CLEAR the DTC. TEST the system for normal operation.