Question about 2002 Toyota RAV4
171 Lean mixture
420 catalytic converter inefficient
1130 Air Fuel sensor range
1133 air fuel sensor
All those codes mean is theat the system is running lean and suspect the O2 sensor is bad.
I would like to know thw engine, miles and tranny type.
It means the Transmission which is attached to the engine that turns the driveline meaning the wheels.
P0171 Lean Mix can be caused by the following:
* Low fuel pressure due to a weak pump or leaky fuel pressure regulator. (use a fuel pressure gauge to check fuel pressure at idle)
* Dirty fuel injectors. (try cleaning the injectors)
* Vacuum leaks at the intake manifold , vacuum hose connections or throttle body. (Use a vacuum gauge to check for low intake vacuum)
* Leaky EGR valve. (Check operation of EGR valve)
* Leaky PCV Valve or hose. (Check valve and hose connections)
* Dirty or defective Mass Airflow Sensor (MAF). (Try cleaning the MAF sensor wires or filament with aerosol electronics cleaner. Do NOT use anything else to clean the sensor, and do not touch the sensor wires)
P1130 Heated oxygen sensor
Worrry about the F/pressure later. Test the throttle position and MAP sensor by following the book procedures.
RAV4 TPS checks
(1)Fully Closed VTA & E 2200-5700 ohms
Fully Open VTA & E 22000-10,200ohms
VC & E 22500-5900ohms
(1)Apply vacuum to throttle opener before checking TP sensor.
In the book find the illustration of the throttle opener and do below.
THROTTLE OPENER ADJUSTMENT
Start engine and warm engine to normal operating temperature. Ensure idle speed is within specification.
See 4-CYLINDER IDLE SPEED under IDLE SPEED & MIXTURE.
With engine idling, disconnect and plug vacuum hose at throttle opener. Increase engine speed to 2500 RPM. Release throttle and note engine speed.
Engine speed should be 1300-1500 RPM with electric cooling fan off.
If engine speed is not within specification, loosen lock nut (if equipped) and rotate throttle opener adjusting screw until correct engine speed is obtained. Tighten lock nut (if equipped). Reinstall vacuum hose on throttle opener.
You might have a dead spot on the TPS or a problem with the MAP sensor
Do you have any OBD2 code/s
I think Rav4 even though is an inline 4 banger ..but it has 2 upstream and 2 dn stream O2 sensor on most models.....bet u he put after market O2 sensor instead of a wide band air fuel ratio sensor .....thats where the bucking came from....
Could be it they operate differently in heat plus its got its own relay within the circuit that operates at the same time as the EFI relay.
wide band air fuel sensor use amp to detect rich & lean condition while voltage stay pretty much constant .....traditional O2 sensor use voltage to reflect the A/F ratio ..but not accurate just rich & lean.......but most of the wide band crapping out are becuz of the heating element went.....now that can be chk with a low amp probe
The Wide Ratio A/F sensor it operates @1200F deg compared to the narrow @ 600 it changes its 8 amps. output to the amount of O2. At stoichimetry there's no current flow and the voltage put out by the detection circuit is 3.3volts. At rich mix it produces a negative current flow then voltage goes below 3.3volts. At lean mix positive current flow,the detection circuit will produce above 3.3volts. With the narrow ones its at 0.45volts.
Give the throttle body a good cleanup with carb cleaner and it should be ok.
Posted on Jun 17, 2009
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Posted on Jan 02, 2017
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