DTC P0121-P0123, P0222, P0223, or P2135 (LF1, LFW)
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DTC P0121-P0123, P0222, P0223, or P2135 (LF1, LFW)
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DTC P0121
Throttle Position Sensor Performance
DTC P0122
Throttle Position Sensor 1 Circuit Low Voltage
DTC P0123
Throttle Position Sensor 1 Circuit High Voltage
DTC P0222
Throttle Position Sensor 2 Circuit Low Voltage
DTC P0223
Throttle Position Sensor 2 Circuit High Voltage
DTC P2135
Throttle Position Sensors 1-2 Not Plausible
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Diagnostic Fault Information
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Circuit
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Short to Ground
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High Resistance
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Open
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Short to Voltage
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Signal Performance
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5 V Reference
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P06A3
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-
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P0122, P0222,
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P06A3
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P0121
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TP Sensor 1 Signal
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P0122
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P2119, P2135, P2176
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P0122
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P0123, P2135
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P0121, P2135
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TP Sensor 2 Signal
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P0222
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P2135
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P0223
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P0223, P2135
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P0121, P2135
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Low Reference
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-
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-
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P0123, P0223
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-
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-
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TP Sensor 1
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Circuit
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Short to Ground
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Open
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Short to Voltage
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Operating Conditions:
The engine is idling.
Parameter Normal Range:
TP Sensor 1 3.0-4.0 V
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5 V Reference
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0.00 V
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0.00 V
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4-5 V
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TP Sensor 1 Signal
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0.00 V
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0.00 V
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5.00 V
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Low Reference
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-
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4-5 V
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-
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TP Sensor 2
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Circuit
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Short to Ground
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Open
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Short to Voltage
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Operating Conditions:
The engine is idling.
Parameter Normal Range:
TP Sensor 2 1.4-2.4 V
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5 V Reference
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0-0.5 V
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0-0.5 V
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3-5 V
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TP Sensor 2 Signal
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0.00 V
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5.00 V
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5.00 V
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Low Reference
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-
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5.00 V
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-
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Circuit/System Description
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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 V 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).
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Conditions for Running the DTC
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P0121
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DTCs P0102, P0103, P0107, P0108, P0112, P0113, P0117, P0118, P0335, or P0336 is not set.
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•
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The engine speed is between 400-7,000 RPM.
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The engine coolant temperature (ECT) is between 69-127°C (156-260°F).
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The intake air temperature (IAT) is between -20 to +125°C (-4 to +257°F).
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The DTC runs continuously once the above conditions are met.
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P0122, P0123, P0222, P0223
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The ignition is ON, or the engine is running.
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The engine is not operating in reduced power mode.
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The ignition voltage is greater than 6 V.
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The DTCs runs continuously when the above condition are met.
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P2135
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DTCs P0121, P0122, P0123, P0222, P0223, or P06A3 are not set.
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The ignition is ON, or the engine is running.
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The engine is not operating in reduced power mode.
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The ignition voltage is greater than 6 V.
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The DTCs runs continuously when the above conditions are met.
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Conditions for Setting the DTC
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P0121
The ECM detects that the TP sensor 1 voltage is stuck in range for less than 1 s.
P0122
The ECM detects that the TP sensor 1 voltage is less than 0.3 V for less than 1 s.
P0123
The ECM detects that the TP sensor 1 voltage is greater than 4.8 V for less than 1 s.
P0222
The ECM detects that the TP sensor 2 voltage is less than 0.3 V for less than 1 s.
P0223
The ECM detects that the TP sensor 2 voltage is greater than 4.6 V for less than 1 s.
P2135
The ECM detects that TP sensor 1 and TP sensor 2 disagree greater than 7-10 percent for less than 1 s.
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Action Taken When the DTC Sets
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P0121
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•
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DTC P0121 is a type B DTC
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The ECM commands the throttle actuator control (TAC) system to operate in a Reduced Engine Power mode.
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P0122, P0123, P0222, P0223, or P2135
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DTC P0122, P0123, P0222, P0223, and P2135 are type A DTCs
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The ECM commands the throttle actuator control (TAC) system to operate in a Reduced Engine Power mode.
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Conditions for Clearing the DTC
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DTC P0121 is a type B DTC.
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DTCs P0122, P0123, P0222, P0223 and P2135 is a type A DTC.
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A high resistance condition on the throttle position and throttle actuator control circuits could cause a DTC to set.
Schematic Reference
Engine Controls Schematics (3.0L (LF1))
Engine Controls Schematics (2.8L (LAU))
Connector End View Reference
Component Connector End Views
Description and Operation
Throttle Actuator Control (TAC) System Description
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References
for scan tool information
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Circuit/System Verification
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1.
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Ignition ON, observe the DTC information with a scan tool. Verify DTC P06A3 is not set.
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3.
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Ignition ON, observe both Throttle Position Sensor voltage parameters with a scan tool. Verify the scan tool Throttle Position Sensor 1 and 2 parameters are between 1.0-4.0 V.
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4.
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Perform the scan tool Throttle Sweep Test while observing the Throttle Position Sensors 1 and 2 Agree/Disagree parameter. The parameter should display Agree.
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5.
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Check the DTC information with a diagnostic tool. DTCs P0121, P0122, P0123, P0222, P0223, and P2135 should not generated.
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6.
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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.
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1.
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Ignition OFF, disconnect the harness connector at the Q38 throttle body assembly.
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2.
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Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 5 Ω between the low reference circuit terminal C and ground.
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3.
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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 K20 ECM.
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4.
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Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal E and ground.
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5.
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If less than the specified range, test the 5 V reference circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the K20 ECM.
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6.
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If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
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7.
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Test for less than 1 V between the TP sensor 1 signal circuit terminal D and ground.
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8.
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If greater than specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
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9.
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Test for 4.8-5.2 V between the TP sensor 2 signal circuit terminal F and ground.
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10.
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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 K20 ECM.
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11.
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If greater than specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
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12.
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Install a 3 A fused jumper wire between TP sensor 1 signal circuit terminal D and the 5 V reference circuit terminal E. Verify the scan tool TP sensor 1 voltage parameter is greater than 4.8 V.
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13.
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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 K20 ECM.
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14.
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If all circuits test normal, test or replace the Q38 throttle body assembly.
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Perform the
Diagnostic Repair Verification
after completing the repair.
