Test Description

The numbers below refer to the step numbers on the diagnostic procedures.

1. 1
   
   The Diagnostic System Check - Engine Controls prompts the technician to complete some basic checks and store the Freeze Frame data on the scan tool, if applicable. This creates an electronic copy of the data taken when the fault occurred. The information is then stored in the scan tool for later reference.
2. 2
   
   The throttle angle percentage should steadily increase without binding or a large percentage jump.
3. 3
   
   This step determines if DTC P0121 is the result of a hard failure or an intermittent condition.
4. 4
   
   This step inspects for an open or a short in the FTP sensor 5-volt reference.
5. 5
   
   This step inspects for excessive resistance in the reference voltage circuit. If the test light does not illuminate at all, there is resistance in the circuit.
6. 7
   
   When the 5-volt reference circuit is jumpered to the TP sensor input circuit, the scan tool parameter should read near 100 percent.