The PCM provides a 5 volt reference voltage to the Throttle Position Sensor(TPS). The PCM monitors reference voltage deviation from the power supply circuit of the TPS.
PCM sets DTC P0653 if the PCM detects reference voltage higher than threshold value.
Item
Detecting Condition
Possible Cause
DTC Strategy
Electrical Check
Short to battery in Power circuit
Poor connection or damaged harness
Faulty ETC
Enable Conditions
IG "ON"
Threshold Value
Short to battery
TPS power supply voltage > 5.5V
Diagnostic Time
0.04 sec.
MIL On Condition
1 Drive Cycle
Limp-Home
Forced limited RPM mode : The PCM limits engine speed to 1500rpm
Electrical check of the ETC system is prohibited