Test Description

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

1. 1  - The Diagnostic System Check - Engine Controls prompts the technician to complete some basic checks and store freeze frame data, if applicable. This creates an electronic copy of data taken when fault occurred. Information is then stored in scan tool for later reference.
2. 2  - 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 determines if DTC P0121 is the result of a hard failure or an intermittent condition.
5. 5  - This step inspects for excessive resistance in reference voltage circuit. If test light does not illuminate at all, there is resistance in the circuit.
6. 7  - When 5-volt reference circuit is jumpered to TP sensor input circuit, scan tool parameter should read near 100 percent.