Engine will not idle after the actuator, throttle body was replaced?

Tiny
DICKSONRED2
  • MEMBER
  • 1998 LEXUS GS 300
  • AUTOMATIC
  • 200,000 MILES
Car won't run unless you have gad pedal depressed and stay on it when you let off it shuts off. Then at other times it will start and run until you push the gas pedal then it shuts off. Issues started with a code for actuator, throttle body was replaced. Now pulling codes:
P0100
P0110
P1120
P1121
P1125
P1126
P1300
Where should I start?
Tuesday, May 23rd, 2023 AT 11:21 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,822 POSTS
Here's a breakdown of the error codes you provided and their possible meanings:

P0100 - Mass or Volume Air Flow Circuit Malfunction: This code indicates a problem with the Mass Air Flow (MAF) sensor. It could be a faulty sensor, a problem with the wiring or connectors, or an issue with the air intake system.

P0110 - Intake Air Temperature Circuit Malfunction: This code suggests a problem with the Intake Air Temperature (IAT) sensor. It could be a faulty sensor, a wiring issue, or a problem with the sensor's connection to the engine control module (ECM).

P1120 - Throttle Position Sensor Circuit: This code typically points to a fault in the Throttle Position Sensor (TPS) circuit. It could be due to a faulty TPS, damaged wiring, or an issue with the TPS's connection to the ECM.

P1121 - Throttle Position Sensor Range/Performance Problem: This code indicates that the Throttle Position Sensor is experiencing a range or performance issue. It may require calibration, cleaning, or replacement.

P1125 - Throttle Control Motor Circuit: This code suggests a problem with the Throttle Control Motor or its circuit. It could be a faulty motor, damaged wiring, or an issue with the motor's connection to the ECM.

P1126 - Magnetic Clutch Circuit Malfunction: This code relates to the magnetic clutch of the Throttle Control Motor. It could indicate a malfunctioning clutch, wiring problems, or issues with the clutch's connection to the ECM.

P1300 - Igniter Circuit Malfunction (Bank 1): This code is related to the ignition system. It may indicate a problem with the ignition coil, ignition module, or wiring in Bank 1 of the engine.

So I would clear all codes and then just turn the key on without starting the engine to see which hard codes come back this is where we should start. Please let me know.
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Thursday, May 25th, 2023 AT 8:55 AM

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