1999 ls400
#1
1999 ls400
today, with out warning, the CEL and VSC lights came on and the car went into the "safe" slow speed mode and had no power/ get up and go. I idled it home, power steering was moaning..
got home added fluid to PS tank. was going to autozone to get codes, but car fired up like always and ran perfect.... no lights no nothing..... has anyone ever had this happen to them??
got home added fluid to PS tank. was going to autozone to get codes, but car fired up like always and ran perfect.... no lights no nothing..... has anyone ever had this happen to them??
#4
I agree with PD. Could be a bad connection to your temp sensor, making the ecu think the engine was hot. Billy, with all your 400's, I'm surprised you don't own a scanner.
#6
P1120 Accelerator Pedal Position Sensor Circuit Malfunction
From other threads I've read I'm strarting to get the feeling this happens in cold weather. It happened to me when it was about 20 degrees outside. (from another thread)
Cut it off and restarted it and it cleared up. (from another thread)
fixed by shutting the car off and restarting (from another thread)
book reads: P1120 Toyota Description
Accelerator pedal position sensor is mounted on the throttle body and it has the 2 sensors to detects the accelerator position and a malfunction of the accelerator position.
The accelerator pedal position sensor is connected with the accelerator pedal by the accelerator wire and the voltage applied to the terminals VPA and VPA2 of the Engine Control Moduel (ECM) changes between 0 V and 5 V in proportion to the opening angle of the accelerator pedal.
The ECM judges the current opening angle of the accelerator pedal from these signals input from terminals VPA and VPA2 and the ECM controls the throttle motor based on these signals.
If the the P1120 code is stored, the ECM shuts down the power for the throttle motor and the magnetic clutch, and the throttle valve is fully closed by the return spring.
However, the opening angle of the throttle valve can be controlled by the accelerator pedal through the throttle cable
any comments as to what I should do? my wife drives this one....
Last edited by billydpowe; 01-29-14 at 08:36 AM.
#7
LOOKING FOR ANSWERS (from another thread)
MORE: There are several threads here that report about problems with a lack of acceleration when the weather is very cold.
I then found that when I heat the throttle body (on the side where the accelerator cable is attached to the accelerator pedal position sensor) with a hair dryer before starting the car, the problem does not occur.
However, there are two sensors on the throttle body: a throttle position sensor ($140 on Amazon) and an accelerator pedal position sensor ($299, only available at Toyota or Lexus).
Can I be sure that this is due to a defective accelerator pedal position sensor (PPS)?
MORE: There are several threads here that report about problems with a lack of acceleration when the weather is very cold.
I then found that when I heat the throttle body (on the side where the accelerator cable is attached to the accelerator pedal position sensor) with a hair dryer before starting the car, the problem does not occur.
However, there are two sensors on the throttle body: a throttle position sensor ($140 on Amazon) and an accelerator pedal position sensor ($299, only available at Toyota or Lexus).
Can I be sure that this is due to a defective accelerator pedal position sensor (PPS)?
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#11
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The accelerator pedal position sensor is connected with the accelerator pedal by the accelerator wire and the voltage applied to the terminals VPA and VPA2 of the Engine Control Moduel (ECM) changes between 0 V and 5 V in proportion to the opening angle of the accelerator pedal.
any comments as to what I should do? my wife drives this one....
any comments as to what I should do? my wife drives this one....
Check the continuity and the resistance. If you find any glitch, you'd better to replace it. At the initial stage of the failure, your type of problem occurs intermittently.
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