P1511

Schematic:

The throttle control module contains a throttle control motor, two Throttle Position (TP) sensors, and two independent signal circuits that vary resistance according to changes in throttle plate position. The ECM will go through a throttle position learn in procedure to determine acceptable values for the throttle plate position operating range. This is based on the inputs from TP sensor 1 and TP sensor 2 and feedback from the throttle control motor. DTC P1511 sets if the ECM is in REDUCED PERFORMANCE mode and the throttle position falls outside a calibrated range.

DTC PARAMETERS
DTC P1511 sets if the ECM is in REDUCED PERFORMANCE mode and the throttle position falls outside a 3.7 - 9.8% range when:
^ Vehicle speed is not present
^ Engine speed less than 2500 rpm
^ ECT between 5°c - 100°C (41°F - 212°)
^ IAT greater than 5°C (41°F)
^ Battery voltage greater than 10 volts
^ Pedal position less than 15%

DTC P1511 diagnostic runs continuously when the above conditions are met.

P1511 is a (type A) DTC

DIAGNOSTIC AIDS
This DTC P1510 may set due to either mechanical faults or electrical circuit faults. Possible causes:
^ Weakened springs in throttle assembly
^ Throttle plate forced to extreme position due to a surge of air or carbon deposits
^ Circuit failure to throttle control motor
^ TP sensor not functioning properly (diagnose TP sensor DTCs first)
^ Throttle body assembly

If DTC P1511 is set, the ECM detected a fault with the backup throttle control system in REDUCED PERFORMANCE mode. If the condition is a hard fault, the engine will not restart once the ignition is cycled Off.