Circuit Description

The TP sensor is variable resistor that monitors throttle opening. The ECM determines vehicle driving condition and adjusts air/fuel mixture accordingly. The CTP switch is located inside of TP sensor. If CTP switch is defective, TP sensor must be replaced. Code is set if CTP switch does not turn on when vehicle is driven. Possible causes are:

• Open in CTP switch circuit.
• CTP switch malfunction.
• ECM malfunction.