Test Description

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

1: The Diagnostic System Check - Vehicle 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: This step determines if DTC P0122 is the result of a hard failure or an intermittent condition.
6: When the 5-volt reference is jumpered to the TP sensor 1 input circuit, the scan tool parameter should read 99 percent.

DTC P0122

Step	Action	Values	Yes	No
Schematic Reference: Engine Controls Schematics Connector End View Reference: Powertrain Control Module Connector End Views or Engine Controls Connector End Views
1	Did you perform the Diagnostic System Check - Vehicle?	-	Go to Step 2	Go to Diagnostic System Check - Vehicle
2	With the throttle closed, select the TP sensor parameter on the scan tool. Is the TP sensor percentage within the specified value?	7-16%	Go to Step 3	Go to Step 4
3	Perform the scan tool Clear DTC Information function. Turn OFF the ignition for 30 seconds. Start the engine. Operate the vehicle within the Freeze Frame conditions as specified. Does DTC P0122 set?	-	Go to Step 4	Go to Diagnostic Aids
4	Is a DTC P0452 also set?	-	Go to Step 8	Go to Step 5
5	Disconnect the throttle actuator control (TAC) module electrical connector. Measure the voltage of the 5-volt reference circuit of the throttle position (TP) sensor at the harness connector with a DMM. Is the reference circuit voltage within the specified value?	4.9-5.1 V	Go to Step 6	Go to Step 7
6	Jump the 5-volt reference circuit and the TP sensor input circuit together at the TAC module harness connector. Observe the TP sensor on the scan tool. Is the TP sensor percentage more than the specified value?	90%	Go to Step 10	Go to Step 9
7	Repair the open in the 5-volt reference circuit between SP108 and the TAC module. Refer to Wiring Repairs . Did you find and correct a condition?	-	Go to Step 14	-
8	Test for an open in the 5-volt reference circuit between SP108 and the PCM. Repair as necessary. Refer to Wiring Repairs . Did you find and correct a condition?	-	Go to Step 14	Go to Step 12
9	Test the TP sensor 1 input circuit for a short to ground. Repair the circuit as necessary. Refer to Wiring Repairs . Did you find and correct a condition?	-	Go to Step 14	Go to Step 13
10	Test for an intermittent or a poor electrical connection at the TAC module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Repair as necessary. Did you find and repair a condition?	-	Go to Step 14	Go to Step 11
11	The TP sensor in the TAC module is faulty. Replace the throttle body assembly. Refer to Throttle Body Assembly Replacement . Did you complete the replacement?	-	Go to Step 14	-
12	Test for an intermittent or a poor electrical connection at the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Repair as necessary. Did you find and repair a condition?	-	Go to Step 14	Go to Step 13
13	Replace the powertrain control module (PCM). Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement?	-	Go to Step 14	-
14	Use the scan tool in order to clear the DTCs. Turn OFF the ignition for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text. Does the DTC run and pass?	-	Go to Step 15	Go to Step 2
15	With a scan tool, observe the stored information, Capture Info. Does the scan tool display any DTCs that you have not diagnosed?	-	Go to Diagnostic Trouble Code (DTC) List - Vehicle	System OK