Circuit Description
The Throttle Position (TP) sensor is mounted on the throttle body/TAC assembly. The sensor is actually two individual Throttle Position sensors within one housing. Two separate signal, ground and reference circuits are used in order to connect the TP sensor assembly and the Throttle Actuator Control (TAC) Module. The TP sensor 1 signal voltage increases as the throttle opens. The signal circuit for TP Sensor is pulled up to reference voltage.
Conditions for Running the DTC
| • | DTCs P0606, P1517, P1518 are not set. |
| • | The ignition switch in the crank or run position. |
| • | The ETC serial data is operational. |
Conditions for Setting the DTC
| • | The TP sensor 2 voltage is less than 0.25 volts or greater than 4.49 volts. |
| • | All above conditions met for less than 1 second. |
Action Taken When the DTC Sets
| • | The PCM will illuminate the malfunction indicator lamp (MIL) during the first trip in which the diagnostic runs and fails. |
| • | If equipped with traction control, the PCM will command the EBTCM via the serial data circuit to turn OFF traction control and illuminate the TRACTION OFF lamp. |
| • | The PCM will store conditions which were present when the DTC set as Freeze Frame and Fail Records data. |
Conditions for Clearing the MIL/DTC
| • | The PCM will turn OFF the MIL during the third consecutive trip in which the diagnostic has been 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 the scan tool. |
Diagnostic Aids
Important: Remove any debris from the connector surfaces before servicing a component. Inspect the connector gaskets when diagnosing/replacing a component. Ensure that the gaskets are installed correctly. The gaskets prevent contaminate intrusion.
| • | The following may cause an intermittent: |
| - | Poor connections. Check for adequate terminal tension. Refer to Wiring Repairs for proper procedure. |
| - | Corrosion |
| - | Mis-routed harness. |
| - | Rubbed through wire insulation. |
| - | Broken wire inside the insulation. |
| • | For an intermittent, refer to Symptoms . |
| • | If a repair is completed and the DTC was cleared using a scan tool on the same ignition cycle, the default action will not clear until an ignition cycle has occurred. |
| • | When the TAC module detects a problem within the ETC System the PCM receives a message across serial data and more than one ETC System related DTC may set. This is due to the many redundant tests run continuously on this system. Locating and repairing one individual problem may correct more than one DTC. Keep this in mind when reviewing captured DTC info. |
Test Description
The numbers below refer to the step numbers on the Diagnostic Table.
-
If the scan tool indicates YES, the problem is within the TP sensor circuit. If the scan tool indicates NO the problem is within the throttle actuator circuits or the battery feed circuit.
-
This step determines if the problem is with the TAC or the circuit.
-
In this step the power has been removed from the signal circuit. The step determines if there is a short to voltage on the signal circuit.
-
In this step the power has been removed from the signal circuit. The step determines if there is a short to voltage on the reference circuit.
-
When the TAC module detects a problem within the ETC System the PCM receives a message across serial data and more than one ETC System related DTC may set. This is due to the many redundant tests run continuously on this system. Locating and repairing one individual problem may correct more than one DTC. Keep this in mind when reviewing captured DTC info.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Powertrain On-Board Diagnostic (OBD) System Check? | -- | ||
|
Important: If the scan tool indicates NO and P1515 or P1516 are not present continue with step 3 of this chart.
Does the scan tool indicate YES? | -- | Go to DTC P1515 Control Module Throttle Actuator Position Performance or DTC P1516 Throttle Actuator Control (TAC) Module Throttle Actuator Position Performance | ||
3 |
Does the TP Sensor 1 voltage remain at or near the specified voltage throughout throttle travel? | 1 V | ||
4 | Inspect the ELEC THROT CONT and the TCS BATT fuses. Is either fuse open? | -- | ||
5 |
Important: If this DTC sets on key up, continue with step 6.
Does the harness movement cause this DTC to fail this ignition? | -- | ||
Does the resistance measure within the specified range? | 4.5-5.5K ohms | |||
7 |
Does the voltage measure within the specified range? | 3.9-4.6 V | ||
8 | Measure the voltage on the reference circuit using a DMM that is connected to a good ground. Does the voltage measure within the specified range? | 3.9-4.6 V | ||
9 | Measure the resistance between the TP 1 and TP 2 sensor ground circuits in the TAC connector using a DMM. Does the resistance measure within the specified range? | 0-5 ohms | ||
Is any voltage present? | -- | |||
11 | Test the signal circuit for a short to ground. Did you find a problem? | -- | ||
Is any voltage present? | -- | |||
13 | Test the reference circuit for a short to ground. Did you find a problem? | -- | ||
14 |
Did you find a problem? | -- | ||
15 | Repair the short to ground in the TAC module battery feed or ignition feed circuits. Refer to Wiring Repairs . Did you complete the repair? | -- | -- | |
16 | Test the for continuity between the signal circuit and all other circuits at the TAC Module connector using a DMM. Do any of the circuits indicate continuity? | -- | ||
17 | Test the for continuity between the reference circuit and all other circuits at the TAC Module connector using a DMM. Do any of the circuits indicate continuity? | -- | ||
18 | Test the for continuity between the ground circuit and all other circuits at the TAC Module connector using a DMM. Do any of the circuits indicate continuity? | -- | ||
19 | Repair the open or high resistance in the TAC module battery feed or ignition feed circuits. Refer to Wiring Repairs . Did you complete the repair? | -- | -- | |
20 | Repair the harness/connections as necessary. Refer to Wiring Repairs or Intermittents and Poor Connections Diagnosis . Did you complete the repair? | -- | -- | |
21 | Repair the short to voltage in the signal circuit. Refer to Wiring Repairs . Did you complete the repair? | -- | -- | |
22 | Repair the short to a ground in the signal circuit. Refer to Wiring Repairs . Did you complete the repair? | -- | -- | |
23 | Repair the open or high resistance in the signal circuit. Refer to Wiring Repairs . Did you find and correct the condition? | -- | ||
24 | Repair the short to voltage in the reference circuit. Refer to Wiring Repairs . Did you complete the repair? | -- | -- | |
25 | Repair the short to a ground in the reference circuit. Refer to Wiring Repairs . Did you complete the repair? | -- | -- | |
26 | Repair the open or high resistance in the ground circuit. Refer to Wiring Repairs . Did you find and correct the condition? | -- | ||
27 | Repair the open or high resistance in the reference circuit. Refer to Wiring Repairs . Did you find and correct the condition? | -- | ||
28 | Inspect for a faulty connection at the TAC. Refer to Intermittents and Poor Connections Diagnosis and Connector Repairs . Did you find and correct the condition? | -- | ||
29 | Replace the throttle body/TAC assembly. Refer to Throttle Body Assembly Replacement . Did you complete the replacement? | -- | -- | |
30 | Inspect for a faulty connection at the TAC Module. Refer to Intermittents and Poor Connections Diagnosis and Connector Repairs . Did you find and correct the condition? | -- | ||
31 | Replace the TAC Module. Refer to Accelerator Pedal Replacement . Did you complete the replacement? | -- | -- | |
32 |
Does the DTC reset? | -- | ||
Does the scan tool indicate any DTCs set that you have not diagnosed? | -- | Go to the applicable DTC table | System OK |
