P2135

Schematic:

The throttle actuator control (TAC) module contains two throttle position sensors with a common 5 volt supply, a common ground, and two independent signal circuits that vary resistance according to changes in throttle plate position. The ECM measures the signal voltage from each TP sensor, which is a reduced value of the ECM 5 volt reference. As the throttle plate opens from 0% throttle to wide open throttle, the voltage on TP sensor 1 signal increases from 0.50 volts to 4.25 (+/-0.1) volts, while the voltage on the TP sensor 2 signal decreases from 4.45 volts to 0.70 (+/-0.1 volts). DTC P2135 will set if TP sensor 1 and TP sensor 2 signals are out of correlation with each other.

DTC PARAMETERS
DTC P2135 will set if TP sensor 1 and TP sensor 2 signal voltages are out of correlation by greater than 6.5% when:
^ Main relay voltage is greater than 7.0 volts
^ Ignition is On

DTC P2135 diagnostic runs continuously once the above conditions have been met.

P2135 is a type D DTC.

DIAGNOSTIC AIDS

IMPORTANT:
^ If a low or high voltage TP sensor 1 or 2 DTC is also set, diagnose that DTC first.
^ If DTC P0121 is also set, without P0221, TP sensor 1 circuit is most likely out of range. If DTC P0221 is also set without P0121, TP sensor 2 circuit is most likely out of range. If both P0121 and P0221 are also set, corrosion or high resistance may exist in the 5 volt Ref-B circuit 2701 or reference return circuit 2752. Check for corrosion and loose or spread terminals.

CAUTION: THE TAC MOTOR IS EXTREMELY STRONG. NEVER USE YOUR FINGERS TO MOVE THE THROTTLE PLATE UNLESS THE TAC MODULE CONNECTOR IS DISCONNECTED.

A skewed TP sensor 1 or 2 can set this DTC. Remove the air induction tubing then wait at least 1 minute with the ignition On. Using Scan tool, monitor the voltage range of the sensor by slowly moving the throttle plate with a flat screwdriver from the full closed to the full open position. The approximate (+/-0.1) TP SENSOR 1 vs. TP SENSOR 2 voltages should be:

TP Sensor TP Sensor 2
0% / 0.50 volts = 4.45 volts
7% / 0.82 volts = 4.17 volts
25% / 1.45 volts = 3.55 volts
50% / 2.45 volts = 2.55 volts
75% / 3.35 volts = 1.65 volts
100% / 4.25 to 4.62 volts = 0.70 to 0.16 volts

NOTE: TP ANGLE on Scan tool is based off of TP sensor 1 only.