Mitsubishi FUEL Manual page 222

13I-28
Code No. P0136 Oxygen sensor (rear) system
<sensor 2>
Range of Check
D Three minutes have been passed since the engine has been started.
D The engine coolant temperature is approx. 80_C or more.
D Intake air temperature is 20 - 50_C
D Engine speed is 1,200 r/min or more
D Driving on a level surface at constant speed.
Set Conditions
D The oxygen sensor (rear) output voltage is 4.5 V or more when the sensor
output voltage is 0.2 V or less and a voltage of 5 V is applied to the oxygen
sensor (rear) inside the engine-ECU <M/T> or engine-A/T-ECU <A/T>.
Range of Check
D Two seconds have passed after the engine-ECU <M/T> or engine-A/T-ECU
<A/T> detected an open circuit.
D When the oxygen sensor (front) is in good condition.
Set Conditions
D When the air/fuel ratio is rich, the oxygen sensor (front) output voltage is 0.5
V or more, the oxygen sensor (rear) output voltage is less than 0.1 V, and
the oxygen sensor (rear) output voltage fluctuates within 0.078 V.
GDI -
Troubleshooting
Probable cause
D Malfunction of oxygen sensor (rear)
D Open or short circuit in the oxygen sensor (rear)
circuit or loose connector contact
D Malfunction of engine-ECU <M/T>
D Malfunction of engine-A/T-ECU <A/T>