Circuit Description

Main Throttle Position (TP) sensor circuits indirectly affect TRAC control system when a malfunction occurs. TRAC system may be switched off as a fail safe function. DTC 45 is set when IDL switch of main TP sensor is on or input voltage to VTH circuit of TRAC ECU is 1.45 volts or greater. DTC 46 is set when VTH circuit of TRAC ECU is 4.9 volts or greater, or VTH circuit of TRAC ECU is .2 volts or greater when IDL1 circuit is off. Main TP sensor signal is transmitted to TRAC ECU from Engine Control Module (ECM). If a problem occurs at engine both ECM and TRAC ECU will detect it. Possible causes are:

• Main TP sensor.
• VTH open circuit.
• IDL1 short circuit.