P0121

F : CHECK THROTTLE POSITION (TP) SENSOR: P0121, P0122, P0123, P0222, P0223

NOTE: Check sensor supply and ground circuits before commencing this test. Electronic Engine Controls

F1 : CHECK THROTTLE POSITION SENSOR RESISTANCE. SENSOR 1
1. Disconnect the throttle position sensor electrical connector, PI026.
2. Measure the resistance between pins 001 and 003 of the TP sensor.

Is the resistance 500 to 900 ohms?

Yes
Goto F2

No
INSTALL a new throttle body. CLEAR the DTC. TEST the system for normal operation.

F2 : CHECK THROTTLE POSITION SENSOR RESISTANCE. SENSOR 2
1. Measure the resistance between pins 001 and 002 of the TP sensor.

Is the resistance 1200 to 1600 ohms?

Yes
Goto G P1657

No
INSTALL a new throttle body. CLEAR the DTC. TEST the system for normal operation.