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Accelerator Pedal Position (App) Sensor

ACCELERATOR PEDAL POSITION (APP) SENSOR REFERENCE CHART

DTC P1575, P2104, P2121, P2122, P2123, P2126, P2127, P2128, P2131, P2132, P2133, P2138 ACCELERATOR PEDAL POSITION (APP) SENSOR
DETECTION CONDITION
  • P1575 indicates the PCM has detrmined that APP1 or APP2 is greater than the expected value.
  • P2104 indicates the TAC system is in the failure mode effects management (FMEM) mode of forced idle.
  • P2121 indicates the PCM, is indicating the signal is out of the normal self-test operating range.
  • P2122 indicates the accelerator pedal position (APP) sensor 1 is out of self-test range low.
  • P2123 indicates the APP sensor 1 is out of self-test range high.
  • P2126 indicates the APP sensor fault flag is set for sensor 2 by the PCM, indicating the signal is out of the normal self-test operating range.
  • P2127 indicates the APP sensor 2 is out of self-test range low.
  • P2128 indicates the APP sensor 2 is out of self-test range high.
  • P2131 indicates the APP sensor fault flag is set for sensor 3 by the PCM, indicating the signal is out of the normal self-test operating range.
  • P2132 indicates the APP sensor 3 is out of self-test range low.
  • P2133 indicates the APP sensor is out of self-test range high.
  • P2138 indicates the APP sensor inputs, APP1 and APP2 disagree on the position of the accelerator pedal by more than an expected value.
POSSIBLE CAUSES
NOTE:
  • After clearing an APP sensor DTC to verify a repair or an intermittent concern, apply the accelerator pedal before carrying out the self-test. Take 10 seconds to carry out a full sweep of the accelerator pedal from fully released to fully applied and back to fully released.
  • Accelerator pedal position (APP) sensor
  • Harness circuits: ETCRTN, ETCRTN2, ETCRTN3, ETCREF, ETCREF2, ETCREF3, APP1, APP2, and APP3
  • Damaged PCM
HINT Accelerator Pedal Position (APP) Sensor 
  • The APP sensor is an input to the PCM and is used to determine the amount of torque requested by the operator. Depending on the application either a 2-track or 3-track APP sensor is used.

    2-Track APP Sensor 

  • There are 2 pedal position signals in the sensor. Both signals, APP1 and APP2, have a positive slope (increasing angle, increasing voltage), but are offset and increase at different rates. The 2 pedal position signals make sure the PCM receives a correct input even if one signal has a concern. The PCM determines if a signal is incorrect by calculating where it should be, inferred from the other signals. If a concern is present with one of the circuits the other input is used. There are 2 reference voltage circuits, 2 signal return circuits, and 2 signal circuits (a total of 6 circuits and pins) between the PCM and the APP sensor assembly. The reference voltage circuits and the signal return circuits are shared with the reference voltage circuit and signal return circuit used by the electronic throttle body (ETB) throttle position (TP) sensor. The pedal position signal is converted to pedal travel degrees (rotary angle) by the PCM. The software then converts these degrees to counts, which is the input to the torque based strategy.
G06159223Courtesy of MAZDA MOTORS CORP.
DTC DETECTION CONDITION POSSIBLE COUSES CHART

STEP INSPECTION ACTION
1 PCM QUICK TEST
  • Is DTC P1575, P2104, P2121, P2122, P2123, P2126, P2127, P2128, P2131, P2132, P2133, or P2138 present? 
 Yes For DTC P1575, GO to the next step.
For all others, GO to step 4.
No For a lack/loss of power, GO to step 3. For all others, see DTC INDEX - PCM  .
2 DTC P1575: REPEAT THE KOEO SELF-TEST
NOTE:
  • Make sure the accelerator pedal is not applied during the KOEO self-test.
  • Key ON, engine OFF (KOEO).
  • Carry out the self-test.
  • Are any DTCs present other than P1575? 
 Yes DISREGARD the current DTC at this time. DIAGNOSE the next DTC.
See DTC INDEX - PCM  .
No GO to the next step.
3 CHECK THE ACCELERATOR PEDAL FOR OBSTRUCTION
  • Key ON, engine OFF (KOEO).
  • Press the accelerator pedal fully to the floor and release.
  • Does the pedal move freely to the floor and back? 
 Yes GO to the next step.
No ISOLATE and REPAIR the obstruction. CLEAR the DTCs. REPEAT the self-test.
4 CHECK THE APP SENSOR SIGNAL VOLTAGE RANGES FOR THE ACCELERATOR PEDAL FULLY APPLIED AND RELEASED POSITIONS
  • Access the PCM and monitor the APP1, APP2 and APP3 PIDs.
  • Press the accelerator pedal fully to the floor and release.
  • Accelerator Pedal Fully Applied Voltage Values
    • APP1 3.59 - 4.60 volts
    • APP2 1.72 - 2.40 volts
  • Accelerator Pedal Fully Released Voltage Values
    • APP1 0.64 - 0.96 volts
    • APP2 0.27 - 0.53 volts
  • Are all APP signals out of range for the pedal fully applied and released positions? 
 Yes GO to the next step.
No For continuous memory DTCs P2121 and P2126 with P2131, GO to step 23.
For all others, GO to the next step.
5 CHECK THE VREF VOLTAGE TO APP SENSOR
  • Key in OFF position.
  • APP sensor connector disconnected.
  • Key ON, engine OFF (KOEO).
  • Measure the voltage between:
    • (+) APP Sensor Connector ETCREF, Harness Side and (-) APP Sensor Connector ETCRTN, Harness Side
    • (+) APP Sensor Connector ETCREF2, Harness Side and (-) APP Sensor Connector ETCRTN2, Harness Side
    • (+) APP Sensor Connector ETCREF3, Harness Side and (-) APP Sensor Connector ETCRTN3, Harness Side
  • Is the voltage between 4 - 6 V? 
 Yes For DTC P2122, P2123 or P2138, GO to the next step 10.
For DTC P2127 or P2128, GO to step 10.
No See TEST 1: VEHICLE REFERENCE VOLTAGE (VREF)  .
6 CHECK THE APP1 CIRCUIT FOR AN OPEN IN THE HARNESS
NOTE:
  • Do not move the throttle plate during the resistance measurement. Measure the sensor resistance with the throttle plate at the default position.
  • Key OFF.
  • APP sensor connector disconnected.
  • Measure the resistance between:
    • (+) APP Sensor Connector APP1, Harness Side, and (-) PCM Connector APP1, Harness Side
  • Is the resistance less than 5 ohms? 
 Yes GO to the next step.
No REPAIR the open circuit. CLEAR the DTCs. REPEAT the self-test.
7 CHECK THE APP1 CIRCUIT FOR A SHORT TO GROUND IN THE HARNESS
  • Measure resistance between:
    • (+) APP Sensor Connector APP1, Harness Side and (-) Vehicle Battery, Negative terminal
  • Is the resistance greater than 10 K ohms? 
 Yes GO to the next step.
No REPAIR the open circuit. CLEAR the DTCs. REPEAT the self-test.
8 CHECK THE APP1 CIRCUIT FOR A SHORT IN THE HARNESS
  • Measure resistance between:
    • (+) APP Sensor Connector APP1, Harness Side and (-) APP Sensor Connector ETCRTN, Harness Side
    • (+) APP Sensor Connector APP1, Harness Side and (-) APP Sensor Connector ETCRTN2, Harness Side
    • (+) APP Sensor Connector APP1, Harness Side and (-) APP Sensor Connector ETCREF, Harness Side
    • (+) APP Sensor Connector APP1, Harness Side and (-) APP Sensor Connector ETCREF2, Harness Side
  • Is the resistance greater than 10 K ohms? 
 Yes GO to the next step.
No REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test.
9 CHECK THE APP1 CIRCUIT FOR A SHORT TO POWER IN THE HARNESS
  • Key ON, engine OFF (KOEO).
  • Measure the voltage between:
    • (+) APP Sensor Connector APP1, Harness Side and (-) Vehicle Battery Negative terminal, Harness Side
  • Is any voltage present? 
 Yes REPAIR the open circuit. CLEAR the DTCs. REPEAT the self-test.
No GO to step 18.
10 CHECK THE APP2 CIRCUIT FOR AN OPEN IN THE HARNESS
  • Key OFF.
  • APP Sensor connector disconnected.
  • PCM connector disconnected.
  • Measure the resistance between:
    • (+) APP Sensor Connector APP2, Harness Side and (-) PCM Connector APP2, Harness Side
  • Is the resistance less than 5 ohms? 
 Yes GO to the next step.
No REPAIR the open circuit. CLEAR the DTCs. REPEAT the self-test.
11 CHECK THE APP2 CIRCUIT FOR A SHORT TO GROUND IN THE HARNESS
  • Measure the resistance between:
    • (+) PCM Connector APP2, Harness Side and (-) Vehicle Battery, Negative terminal
  • Is the resistances greater than 10K ohms? 
 Yes GO to the next step.
No REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test.
12 CHECK THE APP2 CIRCUIT FOR A SHORT IN THE HARNESS
  • (+) PCM Connector APP2, Harness Side and (-) Vehicle Battery, Negative terminal
  • Measure the resistance between:
    • (+) APP Sensor Connector APP2, Harness Side and (-) APP Sensor Connector ETCRTN, Harness Side
    • (+) APP Sensor Connector APP2, Harness Side and (-) APP Sensor Connector ETCRTN3, Harness Side
    • (+) APP Sensor Connector APP2, Harness Side and (-) APP Sensor Connector ETCREF, Harness Side
    • (+) APP Sensor Connector APP2, Harness Side and (-) APP Sensor Connector ETCREF3, Harness Side
  • Are the resistances greater than 10 K ohms? 
 Yes GO to the next step
No REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test.
13 CHECK THE APP2 CIRCUIT FOR A SHORT TO POWER IN THE HARNESS
  • Key ON, engine OFF (KOEO).
  • Measure the resistance between:
    • (+) PCM Connector APP2, Harness Side and (-) Vehicle Battery, Negative terminal
  • Is any voltage present? 
 Yes REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test.
No GO to step 19.
14 CHECK THE APP3 CIRCUIT FOR AN OPEN IN THE HARNESS
  • PCM connector disconnected.
  • Measure the resistance between:
    • (+) APP Sensor Connector APP3, Harness Side and (-) APP Sensor Connector APP3, Harness Side
  • Is the resistance less than 5 Ohm? 
 Yes GO to the next step.
No REPAIR the open circuit. CLEAR the DTCs. REPEAT the self-test.
15 CHECK THE APP3 CIRCUIT FOR A SHORT TO GROUND IN THE HARNESS
  • Measure the resistance between:
    • (+) PCM Connector APP3, Harness Side and (-) Vehicle Battery, Negative terminal
  • Is the resistance greater than 10k ohms? 
 Yes GO to the next step.
No REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test.
16 CHECK THE APP3 CIRCUIT FOR A SHORT IN THE HARNESS
  • Measure the resistance between:
    • (+) APP Sensor Connector APP3, Harness Side and (-) APP Sensor Connector ETCRTN, Harness Side
    • (+) APP Sensor Connector APP3, Harness Side and (-) APP Sensor Connector ETCREF, Harness Side
  • Are the resistances greater than 10k ohms? 
 Yes GO to the next step.
No REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test.
17 CHECK THE APP3 CIRCUIT FOR A SHORT TO POWER IN THE HARNESS
  • Key ON, engine OFF. (KOEO)
  • Measure the resistance between:
    • (+) PCM Connector APP3, Harness Side and (-) Vehicle Battery, Negative terminal
  • Is any voltage present? 
 Yes REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test.
No GO to step 20.
18 CHECK FOR THE APP1 CIRCUIT SHORTED TO SIGNALS IN THE SAME HARNESS
  • Key OFF.
  • PCM connector disconnected.
  • APP sensor connector disconnected.
  • Measure the resistance between:
    • (+) APP Sensor Connector APP1, Harness Side and (-) APP Sensor Connector APP2, Harness Side
    • (+) APP Sensor Connector APP1, Harness Side and (-) APP Sensor Connector APP3, Harness Side
    • (+) APP Sensor Connector APP1, Harness Side and (-) APP Sensor Connector ETCREF, Harness Side
    • (+) APP Sensor Connector APP1, Harness Side and (-) APP Sensor Connector ETCREF2, Harness Side
    • (+) APP Sensor Connector APP1, Harness Side and (-) APP Sensor Connector ETCRTN, Harness Side
    • (+) APP Sensor Connector APP1, Harness Side and (-) APP Sensor Connector ETCRTN2, Harness Side
  • Are the resistances greater than 10 K ohms? 
 Yes GO to step 21.
No REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test.
19 CHECK FOR THE APP2 CIRCUIT SHORTED TO SIGNALS IN THE SAME HARNESS
  • Key OFF.
  • Measure the resistance between:
    • (+) APP Sensor Connector APP2, Harness Side and (-) APP Sensor Connector APP1, Harness Side
    • (+) APP Sensor Connector APP2, Harness Side and (-) APP Sensor Connector APP3, Harness Side
    • (+) APP Sensor Connector APP2, Harness Side and (-) APP Sensor Connector ETCREF, Harness Side
    • (+) APP Sensor Connector APP2, Harness Side and (-) APP Sensor Connector ETCREF3, Harness Side
    • (+) APP Sensor Connector APP2, Harness Side and (-) APP Sensor Connector ETCRTN, Harness Side
    • (+) APP Sensor Connector APP2, Harness Side and (-) APP Sensor Connector ETCRTN3, Harness Side
  • Are the resistances greater than 10 K ohms? 
 Yes GO to step 21.
No REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test.
20 CHECK FOR THE APP3 CIRCUIT SHORTED TO SIGNALS IN THE SAME HARNESS
  • Key OFF.
  • Measure the resistance between:
    • (+) APP Sensor Connector APP3, Harness Side and (-) APP Sensor Connector APP1, Harness Side
    • (+) APP Sensor Connector APP3, Harness Side and (-) APP Sensor Connector APP2, Harness Side
    • (+) APP Sensor Connector APP3, Harness Side and (-) APP Sensor Connector ETCREF, Harness Side
    • (+) APP Sensor Connector APP3, Harness Side and (-) APP Sensor Connector ETCREF, Harness Side
    • (+) APP Sensor Connector APP3, Harness Side and (-) APP Sensor Connector ETCRTN, Harness Side
  • Are the resistances greater than 10k ohms? 
 Yes GO to the next step.
No REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test.
21 CHECK THE APP SENSOR CIRCUITS FOR AN INTERMITTENT CONCERN
  • Wiggle, shake, and bend small areas of the wiring harness while working from the sensor to the PCM.
  • Measure the resistance between:
    • (+) APP Sensor Connector APP1, Harness Side and (-) APP Sensor Connector APP1, Harness Side
    • (+) APP Sensor Connector APP2, Harness Side and (-) APP Sensor Connector APP2, Harness Side
    • (+) APP Sensor Connector APP3, Harness Side and (-) APP Sensor Connector APP3, Harness Side
  • Are the resistances less than 5 ohms? 
 Yes GO to the next step.
No ISOLATE the concern and REPAIR as necessary. CLEAR the DTCs. REPEAT the self-test.
22 CHECK FOR DTCs
  • PCM connector connected.
  • Key ON, engine OFF (KOEO).
  • Carry out the KOEO self-test.
  • Are DTCs P2122 and P2127 present? 
 Yes GO to the next step.
No GO to step 24.
23 SIMULATE THE OPPOSITE SIGNAL
  • Key OFF.
  • Connect a fused jumper wire between the following:
    • Point A APP Sensor Connector ECTREF2, Harness Side and Point B APP Sensor Connector APP1, Harness Side
    • Point A APP Sensor Connector ECTREF3, Harness Side and Point B APP Sensor Connector APP2, Harness Side
  • Key ON, engine OFF (KOEO).
  • Access the PCM and monitor the APP1 and APP2 PIDs.
  • Are the voltages greater than 4.5 V? 
 Yes INSTALL a new APP sensor. See ACCELERATOR PEDAL AND SHAFT REMOVAL/INSTALLATION - 2.5L or ACCELERATOR PEDAL REMOVAL/INSTALLATION - 3.0L 01-13B-13. CLEAR the DTCs. REPEAT the self-test.
No GO to the next step.
24 CHECK FOR CORRECT PCM OPERATION
  • Disconnect all the PCM connectors.
  • Check for:
    • corrosion
    • damaged pins
    • pushed-out pins
  • Connect all connectors and make sure they seat correctly.
  • Clear DTCs from PCM memory using IDS or equivalent tester generic OBD II tester.
  • Carry out the PCM Quick Test. See PCM QUICK TEST  .
  • Is the same DTC present? 
 Yes INSTALL a new PCM.
See POWERTRAIN CONTROL MODULE (PCM) REMOVAL/INSTALLATION - 2.5L or POWERTRAIN CONTROL MODULE (PCM) REMOVAL/INSTALLATION - 3.0L .
REPEAT the PCM Quick Test. See PCM QUICK TEST  .
No If any other DTC is present, go to applicable DTC inspection.
If no DTC is present, troubleshooting complete.
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