With TBI

Fig. 080 Chart - Code 21 Throttle Position Sensor:

Fig. 081 - Wiring Diagram for Code 21 Throttle Position Sensor. VIN 0, VIN 2, VIN E, VIN R, VIN U:

CODE 21

THROTTLE POSITION SENSOR

(SIGNAL VOLTAGE HIGH)

1.8L "J" AND 2.5L "A & N" SERIES

FUEL INJECTION (TBI)

The Throttle Position Sensor (TPS) provides a voltage signal that changes relative to the throttle valve. Signal voltage will vary from less than 1.25 volts at idle to 4.5 volts at wide open throttle and is non-adjustable.
The TPS signal is one of the most important inputs used by the ECM for fuel control and for most of the ECM controlled outputs.
Code 21 will set if:
a. TPS signal voltage is greater than 2.5 volts for 2 seconds.
b. MAP is less than 60 kPa (9 psi) or equal to a no load condition.
1. Confirms CODE 21, and that fault is present.
2. Simulates Code 22: If the ECM recognizes the low signal voltage and sets Code 22 the ECM and wiring are OK.