Circuit Description
The commanded throttle position, based on accelerator pedal position and possibly other limiting factors, is compared to the Actual throttle position. The PCM monitors the Commanded and Actual throttle position. This DTC sets if the PCM detects the problem.
Conditions for Running the DTC
| • | No other ETC DTCs are set. |
| • | No PCM processor DTCs are present. |
| • | The ignition switch is in the crank or run position. |
| • | The ignition voltage is greater than 8.5 volts with key ON engine off. |
| • | The ETC system is not in the battery saver mode. |
Conditions for Setting the DTC
| • | The PCM module detects that the commanded and actual throttle positions are not within a calibrated range of each other. |
| • | 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.
| • | If you do not find any trouble, check for mechanical problems or binding that may be temperature related. Components may not move freely in extreme heat or cold due to the presence of contaminants or ice formation. |
| • | The following may cause an intermittent: |
| - | Poor connections. Check for adequate terminal tension. Refer to Wiring Repairs i Body and Accessories for the proper procedure. |
| - | Corrosion |
| - | A mis-routed harness |
| - | A rubbed through wire insulation |
| - | Broken wire inside of the insulation |
| - | Inspect the connector for signs of water intrusion. When this occurs, multiple DTCs should be set and no circuit or component problems can be located. |
| • | For an intermittent condition, refer to Symptoms |
| • | If a repair is completed and the DTC was cleared by using a scan tool on the same ignition cycle, the default action will not clear until an ignition cycle has occurred. |
| • | When the PCM detects a problem within the ETC System other DTCs may set 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.
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If the TP Indicated Angle does not follow the movement of the throttle blade, and no TP sensor DTCs are set, there is a mechanical problem with the throttle shaft or the TP sensor. Replace the throttle body assembly. Re-install the air inlet duct after repairs are completed.
-
When the PCM detects a problem within the ETC System other DTCs may set 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? | -- | ||
2 |
Important: If you came from one of the following DTC tables continue with this table and go to step 3. Is DTC P1120, P1220 or P1221 set? | -- | Diagnose these DTCs first | |
Does the TP sensor 1 and 2 Angle increase to near the specified value as the pedal is depressed and decrease as the pedal is released? | 100% | Go to Diagnostic Aids | ||
4 |
Does the voltage measure specified range? | 7.5-8.5 V | ||
5 |
Is any voltage present? | -- | ||
6 | Test for an open in each Throttle Actuator circuit (Motor Hi and Motor Low) using a DMM. Did you find a problem? | -- | ||
7 | Test for a short to ground on each Throttle Actuator circuit (Motor Hi and Motor Low). Did you find a problem? | -- | ||
8 | Check for continuity between each Throttle Actuator circuit (Motor Hi and Motor Low) and all other circuits in the TAC module connector using a DMM. Does the DMM indicate continuity? | -- | ||
9 | Repair the short to voltage on the affected Throttle Actuator circuit. Refer to Wiring Repairs . Did you complete the repair? | -- | -- | |
10 | Repair the open or high resistance on the affected Throttle Actuator circuit. Refer to Wiring Repairs . Did you complete the repair? | -- | -- | |
11 | Repair the short to ground on the affected Throttle Actuator circuit. Refer to Wiring Repairs . Did you complete the repair? | -- | -- | |
12 | Repair the circuits that are shorted together. Refer to Wiring Repairs . Did you complete the repair? | -- | -- | |
13 | Inspect for faulty connections at the TAC Module. Refer to Intermittents and Poor Connections Diagnosis and Connector Repairs . Did you find and correct the condition? | -- | ||
14 | Replace the TAC Module. Refer to Accelerator Pedal Replacement . Did you complete the replacement? | -- | -- | |
15 | Inspect for faulty connections at the TAC. Refer to Intermittents and Poor Connections Diagnosis and Connector Repairs . Did you find and correct the condition? | -- | ||
16 | Replace the throttle body/TAC assembly. Refer to Throttle Body Assembly Replacement . Did you complete the replacement? | -- | -- | |
17 |
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 |
