What is the MAF sensor on a Lexus LS400?
They are designed to diagnose a hard fault with the sensor. MAF Sensor on the 1990-1994 Lexus LS400 is two sensors in one. This is because the intake air temperature (IAT) sensor is part of the MAF sensor assembly. Here’s a brief description of the circuits (wires) of the MAF sensor:
How to turn off the air bag light in Lexus LS400?
Let the ground wire lay on the floor then you can easily touch the Tc and AB wires against it. Start by touching the end of the Tc wire to the ground wire for one second. After a second, instantly remove the Tc wire and replace it with the AB wire touching the ground wire for one second.
How do you clear fault code on Lexus airbag?
Go back to the airbag menu and select clear fault codes. This procedure can be used to turn off the Lexus airbag light. Fault codes should only be cleared after the system has been repaired. Do not clear Lexus airbag codes if the fault code status is CURRENT or PRESENT.
What does code 41 mean on Lexus LS400?
After several seconds the air bag light will blink fast in a 64msec cycle, this means code 41 has been cleared. Tc + ground, AB + ground, Tc + ground, AB + ground, Tc + ground and hold. -This is all about timing.
Let the ground wire lay on the floor then you can easily touch the Tc and AB wires against it. Start by touching the end of the Tc wire to the ground wire for one second. After a second, instantly remove the Tc wire and replace it with the AB wire touching the ground wire for one second.
Go back to the airbag menu and select clear fault codes. This procedure can be used to turn off the Lexus airbag light. Fault codes should only be cleared after the system has been repaired. Do not clear Lexus airbag codes if the fault code status is CURRENT or PRESENT.
How to clear code 41 on Lexus LS400?
Finally, instantly replace the AB wire with the Tc wire and hold the Tc wire on the ground wire for several seconds. After several seconds the air bag light will blink fast in a 64msec cycle, this means code 41 has been cleared. Tc + ground, AB + ground, Tc + ground, AB + ground, Tc + ground and hold.
Where is the airbag scanner on a Toyota?
The scanner must be able to diagnose the Toyota airbag system (SRS). Connect your OBD-II diagnostic tool to the diagnostic port located under the dashboard, driver’s side. Turn on ignition to position II. All dash lights should be on. Do not start the engine.
They are designed to diagnose a hard fault with the sensor. MAF Sensor on the 1990-1994 Lexus LS400 is two sensors in one. This is because the intake air temperature (IAT) sensor is part of the MAF sensor assembly. Here’s a brief description of the circuits (wires) of the MAF sensor:
How do you remove ignition wire from Lexus LS400?
Remove the two 10mm bolts at the edges. Mark the clamp position and loosen, then remove the air intake connector pipe. 11) Remove these 10mm bolts to remove the upper ignition cable cover. 12) Remove this 10mm bolt to remove the RH engine wire cover.
What kind of spark plug does a Lexus LS400 use?
The old plug was a Denso (ND) PK20R11. 20) Place the new spark plug (with anti-seize compound, step 2) in the socket and carefully lower it into the chamber. Tighten the spark plug by hand and be careful that it is properly threaded.
What’s the idle speed of a Lexus LS400?
Once the car has warmed up inspect idle speed. Normal idle speed is 650 RPMs, + or – 50 RPMs. After replacing the spark plugs and wires my idle was 650 RPMs, dead on. C=? C=? It’s amazing how low the Vitek wire resistances are!
Can a multimeter diagnose a Lexus air flow sensor?
Whether you use a multimeter or an oscilloscope, you’ll be able to successfully diagnose this Lexus Mass Air Flow Sensor. Lastly, these tests are not designed to diagnose an intermittent problem with the MAF sensor. They are designed to diagnose a hard fault with the sensor.
How does the output signal of the MAF sensor work?
The output signal of the MAF sensor is a low frequency Hertz signal to the ECM. The MAF sensor works this way: the frequency of the signal increases as the engine accelerates away from idle. This increase in Hz frequency is tied to the amount of air going into the engine.
Whether you use a multimeter or an oscilloscope, you’ll be able to successfully diagnose this Lexus Mass Air Flow Sensor. Lastly, these tests are not designed to diagnose an intermittent problem with the MAF sensor. They are designed to diagnose a hard fault with the sensor.
The output signal of the MAF sensor is a low frequency Hertz signal to the ECM. The MAF sensor works this way: the frequency of the signal increases as the engine accelerates away from idle. This increase in Hz frequency is tied to the amount of air going into the engine.
What is the idle signal on a Lexus LS400?
45 – When idle switch is ON, main throttle position sensor signal is 1.5V or higher 46 – Main throttle position sensor signal is 4.3V or higher, or main throttle position sensor signal is 0.2V or lower when idle switch is OFF 47 – When idle switch is ON, sub-throttle position sensor signal is 1.45V or higher
Where do you put the jumper wire on a Lexus LS400?
For engine and transmission codes you place the jumper wire in Te1 and E1. For air bag codes, ABS and TRAC codes, you place the jumper wire in Tc and E1.
What should I do if my ECT sensor doesn’t change?
Remove corrosion from the sensor’s electrical terminal using electrical contact cleaner and repeat your test, if necessary. If the ECT sensor’s resistance didn’t change as the engine temperature rose, replace the sensor. If your sensor only registers infinite resistance, the sensor has a broken internal contact and you need to replace it.
How big is the oxygen sensor on a Lexus LS400?
New universal oxygen sensor vs. OEM oxygen sensor. The Walker sensor comes with the sensor, butt-connectors, heat shrink tubing, high-temp antiseize, and instructions. The OEM sensor is about 10.5″ inches end to end. 5) Cut the wiring harness off of the old sensor a few inches from the base of the old sensor.
Can a universal oxygen sensor be installed on a Lexus?
This tutorial will show you how to install universal oxygen sensors. A universal oxygen sensor requires you to cut off the wiring harness from the old OEM sensor and splice it to the new universal sensor. It does take a little extra time to do this but you will save a LOT of money if you go the universal route.
Where do you find the engine code on a Lexus LS400?
For engine codes, you count the blinks on the check engine light. For transmission codes, you count the blinks on the “O/D OFF” light. For airbag codes, you count the blinks on the “airbag” light.
Where are the diagnostic terminals on a Lexus LS400?
Connect terminals Te1 and E1 by placing a short piece of wire in the TDCL diagnostic port under the steering wheel. You can also connect these terminals using the check connector located in the engine bay. For engine and transmission codes you place the jumper wire in Te1 and E1.
When is the idle switch off on a Lexus LS400?
27 – When power supply to step motor is stopped, sub-throttle valve does not reach its fully-open position 45 – When idle switch is ON, main throttle position sensor signal is 1.5V or higher 46 – Main throttle position sensor signal is 4.3V or higher, or main throttle position sensor signal is 0.2V or lower when idle switch is OFF