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Circuit/System Description
The throttle body assembly contains 2 throttle position (TP) sensors. The TP sensors are mounted to the throttle body assembly and are not serviceable. The TP sensors provide a signal voltage that changes relative to throttle blade angle. The engine control module (ECM) supplies the TP sensors with a common 5-volt reference circuit, a common low reference circuit, and 2 independent signal circuits.
The TP sensors have opposite functionality. TP sensor 1 signal voltage decreases and TP sensor 2 signal voltage increases as the accelerator pedal increases to wide open throttle (WOT).
Conditions for Running the DTC
P0121
* DTCs P0102, P0103, P0107, P0108, P0112, P0113, P0117, P0118, P0335, or P0336 is not set.
* The engine speed is between 400-6,500 RPM.
* The engine coolant temperature (ECT) is between 70-125°C (158-257°F).
* The intake air temperature (IAT) is between -20 to +125°C (-4 to +257°F).
* The DTC runs continuously when the above conditions are met.
P0122, P0123, P0222, P0223
* DTCs P0641, or P06A3 are not set.
* The ignition is ON, or the engine is running.
* The engine is not operating in reduced power mode.
* The ignition voltage is greater than 6 volts.
* The DTCs runs continuously when the above condition is met.
P2135
* DTCs P0122, P0123, P0222, P0223, P0641, or P06A3 are not set.
* The ignition is ON, or the engine is running.
* The engine is not operating in reduced power mode.
* The ignition voltage is greater than 6 volts.
* The DTCs runs continuously when the above condition is met.
Conditions for Setting the DTC
P0121
The ECM detects that the TP sensor 1 voltage is stuck in range for less than 1 second.
P0122
The ECM detects that the TP sensor 1 voltage is less than 0.3 volt for less than 1 second.
P0123
The ECM detects that the TP sensor 1 voltage is greater than 4.8 volts for less than 1 second.
P0222
The ECM detects that the TP sensor 2 voltage is less than 0.3 volt for less than 1 second.
P0223
The ECM detects that the TP sensor 2 voltage is greater than 4.6 volts for less than 1 second.
P2135
The ECM detects that TP sensor 1 and TP sensor 2 disagree greater than 5 percent for less than 1 second.
Action Taken When the DTC Sets
P0121
* DTC P0121 is a type B DTC
* The ECM commands the throttle actuator control (TAC) system to operate in a Reduced Engine Power mode.
P0122, P0123, P0222, P0223, or P2135
* DTC P0122, P0123, P0222, P0223, and P2135 are type A DTCs
* The ECM commands the throttle actuator control (TAC) system to operate in a Reduced Engine Power mode.
Conditions for Clearing the DTC
* DTC P0121 is a type B DTC.
* DTCs P0122, P0123, P0222, P0223 and P2135 is a type A DTC.
Diagnostic Aids
* It may be necessary to disconnect the battery to clear DTC P2135.
* A high resistance condition on the throttle actuator control circuits could cause a DTC to set.
Reference Information
Schematic Reference
Engine Controls Schematics (
See: Powertrain Management > Electrical > Engine Controls Schematics)
Connector End View Reference
Component Connector End Views (
See: Vehicle > Connector Views > Connector End Views By Name)
Description and Operation
Throttle Actuator Control (TAC) System Description (
See: Computers and Control Systems > Components > Throttle Actuator Control (TAC) System Description)
Electrical Information Reference
* Circuit Testing (
See: Vehicle > Component Tests and General Diagnostics > Circuit Testing)
* Connector Repairs (
See: Vehicle > Component Tests and General Diagnostics > Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (
See: Vehicle > Component Tests and General Diagnostics > Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (
See: Vehicle > Component Tests and General Diagnostics > Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (
See: A L L Diagnostic Trouble Codes ( DTC ) > Diagnostic Trouble Code Descriptions > Powertrain Diagnostic Trouble Code (DTC) Type Definitions)
Scan Tool Reference
Control Module References (
See: Vehicle > Programming and Relearning) for scan tool information
Circuit/System Verification
1. Ignition ON, observe the DTC information with a scan tool. Verify DTC P06A3 is not set.
♦ If the DTC is set, refer to DTC P0641, P0651, P0697, or P06A3 (
See: A L L Diagnostic Trouble Codes ( DTC ) > P Code Charts > Powertrain Management).
2. Ignition ON, observe both TP Sensor voltage parameters with a scan tool. Verify the scan tool TP sensor parameters are between 0.50-4.5 V.
3. Observe the scan tool TP sensor 1 and 2 Agree/Disagree parameter while performing the following tests:
* Rapidly depress the accelerator pedal from the rest position to the wide open throttle position (WOT) and release pedal. Repeat the procedure several times.
* Slowly depress the accelerator pedal to WOT and then slowly return the pedal to closed throttle. Repeat the procedure several times.
The TP sensor 1 and 2 Agree/Disagree parameter should display Agree.
4. Observe the DTC Information with a scan tool. DTCs P0121, P0122, P0123, P0221, P0222, and P0223 should not set.
5. Observe both TP Sensor percentage parameters while quickly pressing the accelerator pedal from a closed throttle to WOT. Both TP Sensor percentage parameters should change.
6. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the throttle body assembly.
2. Ignition OFF for 1 minute, test for less than 5 ohm between the low reference circuit terminal E and ground.
♦ If greater than the specified range, test the low reference circuit for a short to voltage, or an open/high resistance. If the circuit tests normal, replace the ECM.
3. Ignition ON, test for 4.8-5.2 V between the 5-volt reference circuit terminal C and ground.
♦ If less than the specified range, test the 5-volt reference circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the ECM.
♦ If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
4. Test for less than 1 volt between the TP sensor 1 signal circuit terminal F and ground.
♦ If greater than specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
5. Test for 4.8-5.2 V between the TP sensor 2 signal circuit terminal D and ground.
♦ If less than specified range, test the signal circuit for a short to ground, or an open/high resistance. If the circuit tests normal, replace the ECM.
♦ If greater than specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
6. Install a 3 A fused jumper wire between TP sensor 1 signal circuit terminal F and the 5-volt reference circuit terminal C. Verify the scan tool TP sensor 1 voltage parameter is greater than 4.8 V.
♦ If less than the specified range, test the signal circuit for a short to ground, or an open/high resistance. If the circuit tests normal, replace the ECM.
7. If all circuits test normal, test or replace the throttle body assembly.
Repair Instructions
Perform the Diagnostic Repair Verification (
See: A L L Diagnostic Trouble Codes ( DTC ) > Verification Tests > Diagnostic Repair Verification) after completing the diagnostic procedure.
* Throttle Body Assembly Replacement (
See: Throttle Body > Removal and Replacement)
* Control Module References (
See: Vehicle > Programming and Relearning) for ECM replacement, setup, and programming
Throttle/Idle Learn
Description
The
engine control module (
ECM) learns the airflow through the
throttle body to ensure the correct idle. The learned airflow values are stored within the ECM. These values are learned to adjust for production variation and will continuously learn during the life of the vehicle to compensate for reduced airflow due to throttle body coking. Anytime the throttle body airflow rate changes, for example due to cleaning or replacing, the values must be relearned.
An engine that had a heavily coked throttle body that has been cleaned or replaced may take several drive cycles to learn out the coking. To accelerate the process, the scan tool has the ability to reset all learned values back to zero. A new ECM will also have values set to zero.
The idle may be unstable or a DTC may set if the learned values do not match the actual airflow.
Conditions for Running the Idle Learn Procedure
With Scan Tool - Reset Procedure
* DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0116, P0117, P0118, P0119, P0121, P0122, P0123, P0128, P0171, P0172, P0201, P0202, P0203, P0204, P0222, P0223, P0300, P0351, P0352, P0353, P0354, P0496, P0601, P0604, P0606, P0641, P0651, P0697, P06A3, P1516, P2101, P2119, P2122, P2123, P2127, P2128, P2135, P2138, or P2176 are not set.
* Ignition ON, engine OFF.
* The
vehicle speed sensor (
VSS) is 0 km/h (0 MPH).
Idle Learn Procedure
With Scan Tool - Reset Procedure
1. Ignition ON, engine OFF, with a scan tool, perform the Idle Learn Reset in Module Setup.
2. Start the engine, monitor the Throttle Body Idle Airflow Compensation parameter. The Throttle Body Idle Airflow Compensation value should equal 0% and the engine should be idling at a normal
idle speed.
3. Clear the DTCs with a scan tool.
...
What are Permanent Diagnostic Trouble Codes?
Permanent Diagnostic Trouble Codes (PDTCs) are very similar to regular Diagnostic Trouble Codes (DTCs). However, unlike regular DTCs, they cannot be reset by disconnecting the vehicle’s battery or cleared using an On-Board Diagnostic (OBD) scan tool. The only way to clear a PDTC is to fix the underlying problem with the vehicle that originally caused the PDTC and its corresponding DTC to set, and then allow the vehicle sufficient drive time to re-run the monitor that identified the problem in the first place. When the monitor runs without identifying a problem, the PDTC will clear itself.
