Diagnostic Aids

WARNING: This page is about a different variant/trim than selected.

Use the J 35616 Connector Test Adapter Kit for any test that requires probing the ECM harness connector or a component harness connector. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems for intermittent conditions.

DTC P2122

Step	Action	Values	Yes	No
Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Control Module (ECM) Connector End Views or Engine Controls Connector End Views
1	Did you perform the Diagnostic System Check-Engine Controls?	-	Go to Step 2	Go to Diagnostic System Check - Engine Controls
2	Turn ON the ignition, with the engine OFF. Observe the accelerator pedal position (APP) sensor 1 voltage with a scan tool. Is the APP sensor 1 voltage less than the specified value?	0.8 V	Go to Step 5	Go to Step 3
3	Observe the Freeze Frame/Failure Records for this DTC. 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, or as close to the Freeze Frame/Failure Records that you observed. Does the DTC fail this ignition?	-	Go to Step 5	Go to Step 4
4	Clear the DTCs with a scan tool. Slowly depress the accelerator pedal to wide open throttle (WOT), then slowly return the accelerator pedal to the closed position. Repeat this action several times. Did the DTC fail this ignition?	-	Go to Step 18	Go to Diagnostic Aids
5	Turn OFF the ignition. Disconnect the APP sensor harness connector. Refer to Accelerator Pedal Position (APP) Sensor Replacement . Turn ON the ignition, with the engine OFF. Measure the voltage from the 5-volt reference circuit of the APP sensor 1 to a good ground with a DMM. Is the voltage within the specified range?	4.8-5.2 V	Go to Step 6	Go to Step 10
6	Turn OFF the ignition. Connect a 3-amp fused jumper wire between the 5-volt reference circuit of the APP sensor 1 and the signal circuit of the APP sensor 1. Turn ON the ignition, with the engine OFF. Observe the APP sensor 1 voltage with a scan tool. Is the APP sensor 1 voltage within the specified value?	4.8-5.2 V	Go to Step 7	Go to Step 12
7	Turn OFF the ignition for 30 seconds. IMPORTANT: It may be necessary to remove the ECM/TCM fuse to allow the ECM to power down. Allow the engine control module (ECM) to completely power down. This can be verified by the loss of communication on the scan tool. Measure the resistance from the low reference circuit of the APP sensor 1 to a good ground with a DMM. Is the resistance less than the specified value?	5 ohm	Go to Step 15	Go to Step 8
8	Disconnect the ECM. Refer to Engine Control Module (ECM) Replacement . Test the low reference circuit of the APP sensor 1 for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 20	Go to Step 9
9	Measure the resistance from the case of the ECM to the battery ground. Is the resistance less than the specified value?	5 ohm	Go to Step 16	Go to Step 14
10	Disconnect all components that share the 5-volt reference voltage source one at a time. Measure the voltage from the 5-volt reference circuit of the throttle position (TP) sensor 1 to a good ground with a DMM. Is the voltage within the specified range after disconnecting any component?	4.8-5.2 V	Go to Step 17	Go to Step 11
11	Test the 5-volt reference circuit of the APP sensors for the following conditions: A short to ground High resistance An open circuit Repair as necessary. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 20	Go to Step 13
12	Test the signal circuit of the APP sensor 1 for the following conditions: A short to ground A short to the low reference circuit High resistance An open circuit Repair as necessary. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 20	Go to Step 16
13	Test the 5-volt reference circuits of the following components for a short to ground: The mass air flow (MAF) sensor The fuel tank pressure (FTP) sensor Repair as necessary. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 20	Go to Step 16
14	Repair the open or high resistance in the ECM ground circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair?	-	Go to Step 20	-
15	Test for an intermittent and for a poor connection at the APP sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 20	Go to Step 18
16	Test for an intermittent and for a poor connection at the ECM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 20	Go to Step 19
17	Replace the component. Refer to the appropriate replacement procedure. Did you complete the replacement?	-	Go to Step 20	-
18	Replace the accelerator pedal assembly. Refer to Accelerator Pedal Position (APP) Sensor Replacement . Did you complete the replacement?	-	Go to Step 20	-
19	Replace the ECM. Refer to Engine Control Module (ECM) Replacement . Did you complete the replacement?	-	Go to Step 20	-
20	Clear the DTCs with a scan tool. Turn OFF the ignition for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records. Did the DTC fail this ignition?	-	Go to Step 2	Go to Step 21
21	Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed?	-	Go to Diagnostic Trouble Code (DTC) List	System OK