P1646

I : DTC P0131, P0132, P0133, P1646. RIGHT-HAND BANK HO2S

I1 : CHECK THE CONSTANT CIRCUIT OF THE RIGHT-HAND BANK HO2S FOR OPEN CIRCUIT

1. Disconnect the HO2S electrical connector EN37.
2. Disconnect the PCM electrical connector, EN16.
3. Measure the resistance between EN16, pin 84 (P) and EN37, pin 4 (P).

Is the resistance less than 5 ohms?
Yes
Goto I2

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

I2 : CHECK THE CONSTANT CIRCUIT OF THE RIGHT-HAND BANK HO2S FOR SHORT TO GROUND

1. Measure the resistance between EN16, pin 84 (P) and GROUND.

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

No
Goto I3

I3 : CHECK THE CONSTANT CIRCUIT OF THE RIGHT-HAND BANK HO2S FOR SHORT TO BATTERY

1. Connect the PCM electrical connector EN16.
2. Turn the ignition switch to the ON position.
3. Measure the voltage between EN37, pin 4 (P) and GROUND.

Is the voltage greater than 5 volts?
Yes
REPAIR the short circuit. For additional information, refer to the wiring diagrams. CLEAR the DTCs. TEST the system for normal operation.

No
Goto I4

I4 : CHECK THE VARIABLE CIRCUIT OF THE RIGHT-HAND BANK HO2S FOR OPEN CIRCUIT

1. Disconnect the PCM electrical connector, EN16.
2. Measure the resistance between EN16, pin 83 (Y) and EN37, pin 3 (Y).

Is the resistance less than 5 ohms?
Yes
Goto I5

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

I5 : CHECK THE VARIABLE CIRCUIT OF THE RIGHT-HAND BANK HO2S FOR SHORT TO GROUND

1. Measure the resistance between EN16, pin 83 (Y) and GROUND.

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

No
Goto I6

I6 : CHECK THE VARIABLE CIRCUIT OF THE RIGHT-HAND BANK HO2S FOR SHORT TO BATTERY

1. Connect the PCM electrical connector EN16.
2. Turn the ignition switch to the ON position.
3. Measure the voltage between EN37, pin 3 (Y) and GROUND.

Is the voltage greater than 5 volts?
Yes
REPAIR the short circuit. 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.