DTC P2122, P2123, P2127, P2128, or P2138 (With Turbocharger)
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DTC P2122, P2123, P2127, P2128, or P2138 (With Turbocharger)
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DTC P2122
Accelerator Pedal Position (APP) Sensor 1 Circuit Low Voltage
DTC P2123
Accelerator Pedal Position (APP) Sensor 1 Circuit High Voltage
DTC P2127
Accelerator Pedal Position (APP) Sensor 2 Circuit Low Voltage
DTC P2128
Accelerator Pedal Position (APP) Sensor 2 Circuit High Voltage
DTC P2138
Accelerator Pedal Position (APP) 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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Accelerator Pedal Position (APP) Sensor 1 5 V Reference Circuit
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P06A3
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P2138
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P2122
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P06A3
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P2138
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Accelerator Pedal Position (APP) Sensor 2 5 V Reference Circuit
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P0108, P0107, P0697
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P2138
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P2127
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P0106, P0108, P0697
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P2138
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Accelerator Pedal Position (APP) Sensor 1 Signal
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P2122
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P2138
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P2122
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P2123, P2138
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P2138
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Accelerator Pedal Position (APP) Sensor 2 Signal
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P2127
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P2138
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P2127
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P2128,P2138
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P2138
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Accelerator Pedal Position (APP) Sensor 1 Low Reference
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-
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P2138
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P2123
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-
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P2138
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Accelerator Pedal Position (APP) Sensor 2 Low Reference
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-
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P2138
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P2128
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-
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P2138
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APP 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 operating at idle.
Parameter Normal Range:
APP Sensor 1 0.88-1.08 V
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APP Sensor 1 5 V Reference
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0.00 V
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0.00 V
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2-3 V
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APP Sensor 1 Signal
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0.00 V
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0.00 V
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4.98 V
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APP Sensor 1 Low Reference
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-
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4.94 V
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-
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APP 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 operating at idle.
Parameter Normal Range:
APP Sensor 2 0.39-0.59 V
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APP Sensor 2 5 V Reference
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0.00 V
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0.00 V
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1.35 V
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APP Sensor 2 Signal
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0.00 V
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0.00 V
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2-5 V
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APP Sensor 2 Low Reference
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-
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4.92 V
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-
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Circuit/System Description
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The accelerator pedal assembly contains 2 accelerator pedal position (APP) sensors. The APP sensors are mounted on the accelerator pedal assembly and are not serviceable. The APP sensors send a signal voltage that changes relative to the pedal position. The engine control module (ECM) supplies each APP sensor with a 5 V reference circuit, a low reference circuit, and a signal circuit.
Both the percentages for APP sensor signals 1 and 2 increase when the pedal is pressed. From about 0 percent in rest position to over 95 percent fully pressed.
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Conditions for Running the DTC
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P2122, P2123, P2127, or P2128
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DTC P06A3 or P0697 are not set.
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The ignition is ON or engine is running.
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The ignition voltage is greater than 6 V.
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The ECM is not commanding reduced power.
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The DTCs run continuously when the above conditions are met.
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P2138
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DTCs P06A3, P0697, P2122, P2123, P2127, or P2128 are not set.
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The ignition is ON or engine is running.
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The ignition voltage is greater than 6 V.
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The ECM is not commanding reduced power.
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The DTC runs continuously when the above conditions are met.
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Conditions for Setting the DTC
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P2122
The ECM detects that the APP sensor 1 voltage is less than 0.46 V for less than 1 s.
P2123
The ECM detects that the APP sensor 1 voltage is greater than 4.7 V for less than 1 s.
P2127
The ECM detects that the APP sensor 2 voltage is less than 0.32 V for less than 1 s.
P2128
The ECM detects that the APP sensor 2 voltage is greater than 2.6 V for less than 1 s.
P2138
The ECM detects that APP sensor 1 and APP sensor 2 disagree greater than 10 percent for less than 1 s.
OR
The ECM detects that both APP sensor 1 and APP sensor 2 are 5 percent greater than the learned minimum position for less than 1 s.
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Action Taken When the DTC Sets
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DTCs P2122, P2123, P2127, P2128, and P2138 are type A DTCs.
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The ECM commands the TAC system to operate in a reduced engine power mode.
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Conditions for Clearing the DTC
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DTCs P2122, P2123, P2127, P2128, and P2138 are type A DTCs.
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A high resistance condition on the accelerator pedal position circuits could cause a DTC to set.
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Ensure that the in-line harness connector seals are installed correctly. Improper installation could result in water intrusion into the connector and cause a DTC to set.
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Schematic Reference
Engine Controls Schematics
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 DTCs P0697 or P06A3 are not set.
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3.
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Ignition ON, observe the scan tool Accelerator Pedal Position percentage parameter. The scan tool should display 0 percent.
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4.
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Observe the scan tool APP Sensor 1 and 2 Agree/Disagree parameter while performing the following tests:
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Rapidly depress the accelerator pedal from the rest position to the wide open throttle position (WOT) and release pedal. Repeat the procedure several times.
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Slowly depress the accelerator pedal to WOT and then slowly return the pedal to closed throttle. Repeat the procedure several times.
The APP Sensor 1 and 2 Agree/Disagree parameter should display Agree.
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5.
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Use a scan tool to read the DTC Info. DTC P2122, P2123, P2127, P2128, or P2138 should not be set.
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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 B107 accelerator pedal 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 terminals listed below and ground.
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Low reference circuit terminal 4 or A
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Low reference circuit terminal 5 or D
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3.
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If greater than the specified range, disconnect the ECM and test the appropriate 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 both 5 V reference circuit terminals listed below and ground.
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5 V reference circuit terminal 1 or C
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5 V reference circuit terminal 2 or F
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5.
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If less than the specified range, test the appropriate 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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Verify the appropriate APP sensor voltage parameter is at 0 V.
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8.
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If greater than the specified range, disconnect the ECM and test the appropriate signal circuit terminal listed below for a short to voltage. If the circuit tests normal, replace the K20 ECM.
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APP sensor 1 signal circuit terminal 3 or E
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APP sensor 2 signal circuit terminal 6 or B
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9.
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Install a 3 A fused jumper wire between the appropriate signal circuit listed below and the 5 V reference circuit terminal 1. Verify the appropriate APP sensor voltage parameter is greater than 4.8 V.
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APP sensor 1 signal circuit terminal 3 or E
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APP sensor 2 signal circuit terminal 6 or B
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10.
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If less than the specified range, test the appropriate 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 all circuits test normal, replace the B107 accelerator pedal assembly.
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Perform the
Diagnostic Repair Verification
after completing the repair.
