Circuit Description
The throttle position (TP) sensor incorporates 2 ratiometric TP sensors into one housing. TP sensor 1 and TP sensor 2 each have a 5-volt reference circuit supplied by the throttle actuator control (TAC) module. The TAC module supplies each TP sensor with a low reference circuit. Each TP sensor supplies the TAC module with a signal voltage that is proportional to the throttle blade position. The TP signal voltages are opposite from one another. TP sensor 1 is pulled up to reference voltage as the throttle blade is opened. The TP sensor 2 is pulled down to low reference as the throttle blade is opened. The TP sensor 1 and the accelerator pedal position (APP) sensor 1 share a 5-volt reference circuit that is bussed within the TAC module. The TP sensor 2 and APP sensor 2 share a 5-volt reference circuit that is also bussed within the TAC module. The APP sensor 3 has a dedicated 5-volt reference circuit.
When this DTC sets, the Reduced Engine Power indicator will be displayed.
This DTC incorporates 3 different diagnostic tests:
| • | TP sensor 1 and TP sensor 2 correlation |
| • | Throttle blade minimum position correlation between the TP sensor 1 and TP sensor 2 |
| • | TP sensor 1 signal shorted to a 5-volt reference, ground, or the TP sensor 2 signal circuit |
If the PCM detects that one or more of the TP sensor 1 tests are out of range, DTC P2135 sets.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P2135 Throttle Position (TP) Sensor 1-2 Correlation
Conditions for Running the DTC
| • | DTCs P2108 or U0107 are not set. |
| • | The ignition switch is in the crank or run position. |
| • | The ignition voltage is greater than 5.23 volts. |
| • | The TP sensor 1 to TP sensor 2 correlation test runs continuously. |
| • | The throttle blade minimum position correlation test runs once after the ignition is turned ON. |
| • | The TP sensor 1 signal circuit short tests runs continuously. |
Conditions for Setting the DTC
| • | The TP sensor 1 to TP sensor 2 correlation error is more than 6 percent for less than 1 second. |
| OR |
| • | The PCM detects a short on the TP sensor 1 signal circuit for less than 1 second. |
Action Taken When the DTC Sets
| • | The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails. |
| • | The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame and/or the Failure Records. |
| • | The control module commands the TAC system to operate in the Reduced Engine Power mode. |
| • | A message center or an indicator displays Reduced Engine Power. |
| • | Under certain conditions the control module commands the engine OFF. |
Conditions for Clearing the MIL/DTC
| • | The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail. |
| • | A current DTC, Last Test Failed, clears when the diagnostic runs and passes. |
| • | A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic. |
| • | Clear the MIL and the DTC with a scan tool. |
Diagnostic Aids
| • | Inspect the TAC module connectors for signs of water intrusion. When water intrusion occurs, multiple DTCs could be set with no DTC circuit or component conditions found during diagnostic testing. |
| • | When the TAC module detects a condition within the TAC system, more than 1 TAC system related DTC may set. This is due to the many redundant tests that run continuously on this system. Locating and repairing 1 individual condition may correct more than 1 DTC. Disconnecting components during testing may set additional DTCs. Keep this in mind when reviewing the Capture Info. |
| • | If this DTC is determined to be intermittent, refer to Intermittent Conditions . |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Engine Controls Schematics Connector End View References: 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 in Vehicle DTC Information |
2 | Is DTC U0107 also set? | Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information | Go to Step 3 |
3 |
Does the scan tool TP sensor 1 and sensor 2 Agree/Disagree parameter indicate Disagree? | Go to Step 5 | Go to Step 4 |
4 |
Does the TP sensor Agree/Disagree parameter change from Agree to Disagree during the above test? | Go to Step 18 | Go to Step 5 |
5 |
Did you find and correct the condition? | Go to Step 20 | Go to Step 6 |
6 | Test for a short between the TP sensor 1 5-volt reference circuit and all other TAC module circuits, with a DMM. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 20 | Go to Step 7 |
7 | Test the TP sensor 1 signal circuit for resistance, with a DMM. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 20 | Go to Step 8 |
8 | Test for a short between the TP sensor 1 signal circuit and all other TAC module circuits, with a DMM. 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 | Test the TP sensor 1 low reference circuit for resistance, with a DMM. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 20 | Go to Step 10 |
10 | Test for a short between the TP sensor 1 low reference circuit and all other TAC module circuits, with a DMM. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 20 | Go to Step 11 |
11 | Test the TP sensor 2 5-volt reference circuit for resistance, with a DMM. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 20 | Go to Step 12 |
12 | Test for a short between the TP sensor 2 5-volt reference circuit and all other TAC module circuits, with a DMM. 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 |
13 | Test the TP sensor 2 signal circuit for resistance, with a DMM. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 20 | Go to Step 14 |
14 | Test for a short between the TP sensor 2 signal circuit and all other TAC module circuits, with a DMM. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 20 | Go to Step 15 |
15 | Test the TP sensor 2 low reference circuit for resistance, with a DMM. 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 |
16 | Test for a short between the TP sensor 2 low reference circuit and all other TAC module circuits, with a DMM. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 20 | Go to Step 17 |
17 | Inspect for poor connections at the harness connector of the TAC module. Refer to Testing for Intermittent Conditions and Poor Connections and Repairing Connector Terminals in Wiring Systems. Did you find and correct the condition? | Go to Step 20 | Go to Step 18 |
18 | Inspect for poor connections at the harness connector of the TP sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Repairing Connector Terminals in Wiring Systems. Did you find and correct the condition? | Go to Step 20 | Go to Step 19 |
19 |
Important: The TP sensor is not a serviceable part and should only be replaced with the throttle body assembly. Replace the throttle body assembly. Refer to Throttle Body Assembly Replacement . Did you complete the replacement? | Go to Step 20 | -- |
20 |
Does the DTC run and pass? | Go to Step 21 | Go to Step 2 |
Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed? | Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information | System OK | |
