Home/Lexus/SC/Lexus SC I (1991-2001)/Repair manual/Testing & Diagnostics/DTC P1401 - SUB-THROTTLE POSITION (SUB-TP) SENSOR CIRCUIT
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DTC P1401 - SUB-THROTTLE POSITION (SUB-TP) SENSOR CIRCUIT Lexus SC I

RANGE/PERFORMANCE PROBLEM

CAUTIONIf ECM replacement is instructed in following testing, always ensure ECM harness connector and ground circuit are okay. If either are suspect, repair and repeat testing to confirm ECM malfunction.

Circuit Description

The SUB-TP sensor is similar to the main TP sensor. SUB-TP sensor is used for Traction Control System (TRAC). DTC is set when ECM consistently detects more than 2 volts from VTA2 circuit and closed SUB-TP switch is on. Possible cause is

  1. SUB-TP sensor.