Circuit Description
The throttle position (TP) sensor is used by the PCM to determine the throttle plate angle for various engine management systems. The TP sensor is a potentiometer type sensor with three circuits; 5 volt reference, low reference, and signal. The PCM provides the TP sensor with a 5 volt reference circuit and a low reference circuit. Rotation of the TP sensor rotor from the closed throttle position to the wide open throttle (WOT) position provides the PCM with a signal voltage from less than 1.0 volt to greater than 4.0 volts through the TP sensor signal circuit. When the conditions for running this DTC are met the PCM will use the MAP sensor to determine if the predicted operating range of the TP Sensor is correct. A skewed MAP Sensor may cause this DTC to set and should be tested for proper operation if the TP sensor is determined to be operating properly and this DTC continues to set.
Conditions for Running the DTC
| • | DTC's P0107, P0108, P0122, P0123, P1106, P1107, P1121 and P1122 are not set. |
| • | Engine running for greater than 2 minutes. |
| • | ECT is greater than 75°C (167°F). |
| • | MAP reading is less than 50 kPa for a TP sensor skewed high test. |
| • | MAP reading is greater than 70 kPa for a TP sensor skewed low test. |
| • | MAP is steady for 5 seconds or more. |
Conditions for Setting the DTC
| • | The TP sensor reading is greater than a predicted value when the MAP is below 50 kPa. |
| • | The TP sensor reading is less than a predicted value when the MAP is above 70 kPa. |
| • | The above conditions are present for 5 seconds. |
Action Taken When the DTC Sets
| • | The PCM will illuminate the malfunction indicator lamp (MIL) during the second consecutive trip in which the diagnostic test has been run and failed. |
| • | The PCM will store conditions which were present when the DTC set as Freeze Frame/Failure Records data. |
Conditions for Clearing the MIL/DTC
| • | The PCM will turn OFF the malfunction indicator lamp (MIL) during the third consecutive trip in which the diagnostic has run and passed. |
| • | The history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction. |
| • | The DTC can be cleared by using a scan tool. |
Diagnostic Aids
Inspect for the following conditions:
| • | Skewed MAP signal --A skewed MAP signal may cause the PCM to incorrectly determine the TP sensor is out of range. Inspect for an unusually low or high MAP reading. Refer to Manifold Absolute Pressure Sensor Diagnosis . |
| • | If the DTC is determined to be intermittent or the TP sensor system is still suspect, refer to DTC P1121 . |
Step | Action | Values | Yes | No | ||||
|---|---|---|---|---|---|---|---|---|
Schematic Reference: Engine Controls Schematics | ||||||||
1 | Did you perform the Diagnostic System Check-Engine Controls? | -- | Go to Step 2 | |||||
2 |
Important: : If any other DTCs are set, diagnose those DTCs first.
Does the TP angle increase steadily and evenly from the Closed Throttle value to above the wide open throttle value? | 0% 98% | Go to step 3 | Go to Step 4 | ||||
3 |
Does the DTC fail this ignition? | -- | Go to step 4 | Go to Diagnostic Aids | ||||
4 |
Does the scan tool indicate TP sensor voltage at the specified value? | 0 V | Go to Step 5 | Go to Step 6 | ||||
5 |
Does the scan tool indicate TP sensor voltage at the specified value? | 5 V | Go to Step 9 | Go to Step 7 | ||||
6 | With a DMM, test the TP sensor signal circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems . Did you find and correct the condition? | -- | Go to Step 14 | Go to Step 12 | ||||
7 | With a DMM, test the TP sensor 5 volt reference circuit 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 14 | Go to Step 8 | ||||
8 | Test the TP sensor signal circuit 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 14 | Go to Step 11 | ||||
9 | Test the TP sensor low reference circuit 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 14 | Go to Step 10 | ||||
10 | Inspect for a poor connection at the TP sensor harness connector. 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 14 | Go to Step 12 | ||||
11 | Inspect for a poor connection at the PCM harness connector. 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 14 | Go to step 13 | ||||
12 | Replace the TP sensor. Refer to Throttle Position Sensor Replacement . Did you complete the replacement? | -- | Go to Step 14 | -- | ||||
13 | Replace the PCM, refer to Powertrain Control Module Replacement . Did you complete the replacement? | -- | Go to Step 14 | -- | ||||
14 |
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? | -- | System OK | |||||
