Question about 1994 Lexus GS 300

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94 gs300 i bought a used engine from a 93 sc300 and installed it in a 94 gs300.i only had to swap 1 sensor on the throttle body to fit my harness.engine starts up fine but it idles below 500 rpm.when i throttle to 100%,it still idles below 1000.i have strong spark but i also have an engine light that i have not checked

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  • Anonymous Mar 22, 2014

    Cleaned Throttle body and installed throttle position sensor, now 99' LX470 runs too fast.

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Check all of the battery terminals and cables and check the wires on the starter/selonoid, start from the battery and follow the cable out and check all conections , clean and tighten them and if it still does it the starter/selonoid is bad and needs replacement...

Posted on Sep 18, 2008

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Where is crank shaft sensor location on 95 lexus sc300 please help


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How do I adjust the throttle position sensor on my 93 cadillac seville sls 4.9l engine?


4.5 And 4.9L Engines
  1. Remove the air cleaner.
  2. Remove the TP sensor connector.
  3. Unscrew the 2 TP sensor attaching screws and retainers, and remove the TP sensor.

To install:
  1. With the throttle valve in the normal closed idle position, install the TP sensor on the throttle body assembly.
  2. Install 2 TP sensor attaching screws with retainers. Do not tighten the screw until the TP sensor is adjusted.
  3. Install the TP Sensor connector. Adjust the TP Sensor and perform the idle learn procedure.
  4. To Perform the TP sensor adjustment.
    1. Disable the generator by grounding the green harness connector plug adjacent to the generator.
    2. Start the engine, enter diagnostics, and select PCM override PS103 'ISC Actuator'
    3. Press the 'COOLER' button on the CCP to retract the ISC Actuator. This action will disengage the A/C compressor and command the EGR 'OFF'. The Climate control center display will change from '50 to 00'. The ISC Actuator will slowly retract (about 20 seconds) to a fully retracted position. Verify that the throttle lever is resting on the minimum idle speed screw. With the ISC Actuator plunger fully retracted, disconnect the ISC harness.
    4. Select the PCM data PD01, 'TP Sensor', while still in PCM override PS03. Note the throttle position (in degrees) displayed on PCM parameter PD01.
    5. (-0.5° TO + 0.5°)

      No TP sensor adjustment required. Reattach the ISC Actuator harness and disconnect the grounding wire at the generator.
    6. TP Sensor (-10.0° TO -0.6°) or TP Sensor (+ 0.6° TO + 90.0°) TP Sensor adjustment required.

  5. With the engine 'OFF' and the ignition 'ON', reenter diagnostics and select PCM override PS03 'ISC Actuator'. Press the 'COOLER' button to retract the ISC Actuator the minimum air setting.
    1. Loosen the TP sensor screws just enough to permit the sensor to be rotated. Open the throttle slightly and allow the throttle lever to snap shut against the minimum air screw. Adjust the TP sensor so the parameter display is 0°. Tighten the TP sensor mounting screws with the sensor in the adjusted position. Recheck the parameter to be sure the TP sensor parameter is (-0.5° to + 0.5).
    2. Install the air cleaner.

Dec 25, 2015 | Cadillac Cars & Trucks

1 Answer

How do I fix code 13 engine speed sensor Above 1000 rpm


Clearing the codes is simple that is done by removing the fuse of the EFI from junction box 2 for 10 seconds. Make sure to remove the jumper wire and switch the key off before clearing the codes.

Here are some common Lexus vehicles 1990-1995 codes:

Code 12 and Code 13 Rpm signal circuit fault
Code 14 Igniter signal circuit fault
Code 16 ECT control signal fault
Code 21 and Code 28 Main oxygen sensor fault (for ES300; SC300 & GS300 models)
Code 22 Coolant temperature circuit fault
Code 24 Intake temperature sensor circuit fault
Code 25 and Code 26 Air fuel ratio fault (for ES300 & SC300 models)
Code 27 Sub-oxygen sensor circuit fault (for ES300 CA & GS300 models)
Code 31 Low airflow meter voltage (for ES300 and GS300 models)
Code 32 High airflow meter voltage (for ES300 model)
Code 35 Barometric pressure sensor circuit fault (for GS300 & SC300 models)
Code 41 and Code 47 Throttle position sensor circuit fault
Code 42 Vehicle speed sensor circuit fault
Code 43 Starter signal
Code 51 Switch condition signal fault (for ES300; GS300 & SC300 models)
Code 52 Code 52 and Code 55 Knock sensor circuit fault
Code 71 EGR system circuit fault (for ES300; GS300 & SC300 models)
Code 78 Fuel pump control circuit fault (for GS300 & SC300 models)

Nov 18, 2014 | 1990 Lexus LS 400

1 Answer

I have a 93 lexus sc300 that bogs when i step on the throttle... what do i need to do?


It could be a few things. 1. Clogged fuel filter, or maybe a throttle position sensor with a bad spot. Or a fuel pressure problem

May 17, 2012 | Cars & Trucks

1 Answer

1994 cutlass Ciera... I just swapped engines 3.1 from a 96 to a 94...everything went great, except the temperature gage doesn't work. I see in the 94 there is a sending unit on the back head just...


Your 94 engine has separate coolant temp sensor and gauge sender. The 96 engine incorporates both in the engine coolant temp sensor. The coolant temp sensor is near the t-stat, below the throttle body. Check to see how many wires are in this plug. If it only has two, you may be able to use the plug from the 96 motor and wire it into the wire where the original sensor was. You should be able to just color match. Not sure if you can get away with this but the 96 plug should have a third wire, and it's woth a try.

Aug 22, 2011 | 1996 Oldsmobile Cutlass Ciera

4 Answers

I have a 96 jeep cherokee sport, It has not been started in 5 years due to me being gone and it needed the clutch replaced. had the clutch replaced and also replaced the plugs and wires and changed the...


Hi, I recommend you test the MAP sensor. Procedure is listed below. If the Jeep cuts out when accelerating, this is the usual problem.
    2.5 liter engine MAP sensor:
    jturcotte_447.jpg
    4.0 liter engine MAP sensor:
    jturcotte_448.jpg

        TESTING
        See Figures 3 and 4

          jturcotte_449.jpg

                      Fig. Fig. 3: Wiring harness connector terminal identifications for the MAP sensor harness side. Terminal 1 (left), terminal 3 (right)

                      jturcotte_450.jpg

                      Fig. Fig. 4: Performing a voltage test with a digital voltmeter on the harness side of the MAP sensor

                      1. Backprobe with a high impedance voltmeter at MAP sensor terminal Nos. 1 and 3.
                      2. With the key ON and engine off, the voltmeter reading should be approximately 5.0 volts.
                      3. If the voltage is not as specified, either the wiring to the MAP sensor or the PCM may be faulty. Correct any wiring or PCM faults before continuing test.
                      4. Backprobe with the high impotence voltmeter at MAP sensor terminal Nos. 1 and 2.
                      5. Start the vehicle and verify that the sensor voltage is 0.5-1.8 volts with the engine at a normal idling speed.
                      6. Verify that the sensor voltage reaches 3.9-4.8. volts at Wide Open Throttle (WOT).
                      7. If the sensor voltage is not as specified, check the sensor and the sensor vacuum source for a leak or a restriction. If no leaks or restrictions are found, the sensor may be faulty.


                      Removal & Installation


                      1. If the MAP sensor is mounted on the front of the throttle body, the throttle body must first be removed from the engine.
                      2. If the sensor is mounted on the side of the throttle body, the intake air tube must first be removed.
                      3. Remove the two sensor mounting screws and carefully pull the sensor away from the throttle body. Be careful not to lose the rubber L-shaped fitting that attaches the sensor to the throttle body.

                      To install:
                      1. Install rubber L-shaped fitting to the sensor.
                      2. Place the sensor into position being careful to guide the fitting onto the throttle body nipple.
                      3. Install the sensor mounting screws. Tighten the screws to 25 inch. lbs. (3 Nm).
                      4. Install the intake air tube or the throttle body as necessary.

                  Apr 18, 2011 | 1996 Jeep Cherokee Sport

                  1 Answer

                  No spark


                  you may have to get the new engine harners wires and pcm form the 94 model, that will sove your problem

                  Apr 13, 2010 | 1994 Chevrolet Cavalier

                  2 Answers

                  93 Lexus GS300 knock sensor electrical wiring?


                  Knock sensors are small, metal objects that detect prignition be fore it happens and cut fuel to the motor for a split second the keep it from destroying itself. (very important on turbocharged cars=melted pistons can result)
                  The leads are attached to the engine harness. Unscrew your bad sensor, put some teflon tape or paste on your new sensor and install by hand, then tighten with the correct wrench. Plug in the harness plug.

                  Aug 31, 2009 | 1993 Lexus GS

                  3 Answers

                  98 lexus gs300 codes p1120 p1121


                  I wanted to start a thread specifically about failures within the throttle body concerning the GS300 (1998 in my case)

                  My symptons were:
                  VSC, VSC OFF, and ENGINE Lights would come on, followed by my car going into Limp Mode, where only that last 25% (if that) of the throttle would respond (basically have to floor the pedal to even move at all).

                  During the mornings, or when the engine was COLD, the throttle operated normal...then once the car warmed up, usually at about 10 mins, the problem would start...it happened intermitantly at first...1 or 2 days over the course of a week, then it became more consitent, until last week it became a daily problem.

                  The first part I tried was the Throttle Position sensor, which is on the front side of the throttle body, and the easiest thing to replace...this didnt help at all. $300 part from Lexus, $80 part from RockAuto.com (exacly same part toyota OEM)

                  THE PART THAT FIXED THE PROBLEM:
                  ===========================================
                  "Idle Valve Motor", which is the larger electrical object next to the TPS on my 98 GS300. Problem is solved.

                  The Codes I got were P1120 and P1121 - Accelerator Sensor problem. However it wasnt really the Accelerator Sensor, it was indeed to actual electrical Motor that controls the opening of the Butterfly valve inside the Throttle body.

                  I found the problem by good old trouble shooting, and using an ohm meter to see if the throttle electric motor was getting elev, I found that the elec motor just to the left of the TPS was basically freaking out and shutting down. The Accelerator Pedal Sensor is on the Back-side of the throttle body where the throttle cable connects to, and has a spring on it. It was fine.

                  GS300's are indeed "drive by wire" concerning the throttle...the cable triggers the Accel Pedal Sensor, which sends a signal to the ECU, the ECU then sends power to the Idel Valve Elec Motor (next to the TPS), which opens and closes the mechanical butterfly valve, then the TPS sensor detects how far the elec motor is actually opening the butterfly valve...its a closed-loop feed-back system, meaning any failure in any sensor will cause the entire systm to fail.

                  The throttle cable apparently is ONLY there to allow the fail-safe of having that last 10-25% throttle when the electronic system fails...there is a gearbox inside the throtle body which allows the tail end of the throttle to manually engage the butterfly valve...the rest of the time, the butterfly valve is 100% opened and closed via the idle control motor.

                  Nov 23, 2008 | 1998 Lexus Gs 300

                  2 Answers

                  93 Geo Metro


                  As long as they are the same type of engine ( I believe they should both be 1.0L 3 cyl engines). Most parts for the Geo Metro from 1992 to 1994 interchange with out a problem.

                  Nov 10, 2008 | 1993 Geo Metro

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