U040B Lexus Auto Trouble Code
U040B Lexus OBD2 may also be triggered by faults earlier down the line. For example, a dirty MAF sensor might be causing the car to overcompensate in its fuel-trim adjustments. As a result, oxygen sensors are likely to report fuel mixture problems.
The computer notices the canister is empty when it detects a leaner condition (all the vapors are used up) and it resumes normal fuel delivery. Some car manufacturers then close the vent solenoid but leave the purge solenoid open. That creates a vacuum throughout the entire fuel storage system. Once the correct vacuum is reached, it closed the purge solenoid and waits to see if the vacuum holds.
U040B Lexus Possible Solution:
Power Steering Pressure (PSP) Switch Malfunction In Key On, Engine Off Self-Test, this DTC indicates the PSP input to the PCM is high. In Key On, Engine Running Self-Test, this DTC indicates that the PSP input did not change state. Steering wheel must be turned during Key On, Engine Running Self-Test PSP switch/shorting bar damaged SIG RTN circuit open PSP circuit open or shorted to SIGRTN PCM damaged.
U040B Lexus Description For All Models :
- Lexus Daytona
- Lexus Es
- Lexus Flv
- Lexus Gs
- Lexus Gx
- Lexus Is
- Lexus Is200
- Lexus Is220
- Lexus Is250
- Lexus Is300
- Lexus Lf
- Lexus Ls
- Lexus Ls 300
- Lexus Ls 350
- Lexus Lx
- Lexus Minority Report
- Lexus Rx
- Lexus Rx 300
- Lexus Rx400h
- Lexus Rx450h
- Lexus Sc
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U040B Lexus Trouble Repair :
If your vehicle failed a U040B Lexus test and the U040B Lexus Check Engine Light is NOT on, chances are you have a problem with the OBDII system, a burned out MIL lamp, or a faulty catalytic converter. The converter is essentially an afterburner that cleans up the exhaust after it exits the engine. The OBDII system uses a ownstream oxygen sensor to monitor the efficiency of the converter, and it should detect a drop in converter efficiency if the converter has been contaminated or is failing (ignition misfiring, leaky exhaust valves, and oil burning can all damage the converter). What you want to look any conditions that might cause ignition misfire, an overly rich or lean fuel condition, or loss of compression. Use your OBD Express DIY to look at the oxygen sensor outputs, coolant temperature, airflow, calculated engine load, and inlet air temperature. |
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