My Toyota Sienna 2001 check engine light went.

Tiny
ANONYMOUS
  • MEMBER
  • 2001 TOYOTA SIENNA
  • 80,000 MILES
My Toyota Sienna 2001 check engine light went off on code p1135, I changed the o2 oxygen sensor (upstream and downstream) and cleared the code but it came back in 1 minute.
Any advise?
Thanks
Friday, April 5th, 2013 AT 1:33 AM

2 Replies

Tiny
ASEMASTER6371
  • EXPERT
Here is the flow chart. Codes never identify bad parts, just failed systems

Roy
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Friday, April 5th, 2013 AT 1:37 AM
Tiny
ASEMASTER6371
  • EXPERT
To obtain a high purification rate for the CO, HC and NOx components of the exhaust gas, a three-way catalytic converter is used, but for the most efficient use of the three-way catalytic converter, the air-fuel ratio must be precisely controlled so that it is always close to the stoichiometric air-fuel ratio.

The A/F sensor has the characteristic that provides output voltages approximately proportional to the existing air-fuel ratio. The A/F sensor output Voltage* is used to provide feedback for the ECM to control the air-fuel ratio.

By the A/F sensor output, the ECM can determine the deviation amount from the stoichiometric air-fuel ratio and control the proper injection time immediately. If the A/F sensor is malfunctioning, ECM is unable to perform accurate air-fuel ratio control.

The A/F sensor is equipped with a heater which heats the zirconia element. The heater is controlled by the ECM. When the intake air volume is low (the temperature. Of the exhaust gas is low), current flows to the heater to heat the sensor for accurate oxygen concentration detection.

*: The voltage value changes at the inside of the ECM only.

Wiring Diagram

Step 1

Step 2

INSPECTION PROCEDURE

HINT: Read freeze frame data using TOYOTA hand-held tester or OBD II scan tool. Because freeze frame records the engine conditions when the malfunction is detected, when troubleshooting it is useful for determining whether the vehicle was running or stopped, the engine warmed up or not, the air-fuel ratio lean or rich, etc. At the time of the malfunction.
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Friday, April 5th, 2013 AT 1:37 AM

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