DTC 21

Fig. 078 Chart - Code 21 Throttle Position Sensor:

Fig. 079 - Wiring Diagram for Code 21 Throttle Position Sensor. VIN P:

CODE 21

THROTTLE POSITION SENSOR

(SIGNAL VOLTAGE HIGH)

2.0L "J" 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 about 4.5 volts at wide open throttle (WOT).
The TPS signal is one of the most important inputs used by the ECM for fuel control and for many of the ECM controlled outputs.
Code 21 will set if:
a. TPS signal voltage is greater than 3.5 volts for 5 seconds
b. Engine speed less than 1200 RPM. This is the purpose for placing shift lever in drive.
c. MAP is less than 30 kPa (4.5 psi) or equal to a no load condition.
1. Confirms Code 21, and that faults is present.
2. Simulates Code 22: If the ECM recognizes the low signal voltage and sets Code 22 the ECM and wiring are OK.