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Test DV: Electronic Throttle Control Throttle Position Sensor, Throttle Control Motor: Testing

NOTE: Always service Accelerator Pedal Position (APP) sensor DTCs first, then proceed to Throttle Position (TP) sensor and TACM motor DTCs that may be present. This is necessary because the ETC system DTCs effect each other. It should also be noted, that a KOER DTC P0121 can be set by the operator resting a foot on the accelerator pedal during the test.
    NOTE: For additional testing information, see DIAGNOSTIC AIDS .

  1. 1) For KOEO, KOER & Continuous Memory DTCs P0121, P0221, P2104, P2105, P2106 , P2111 & P2112: Check For Throttle Plate Binding Or Obstruction
    For DTC P0121, P2111 and P2112, fault exhibits a symptom of limited power. A TP V PID reading less than 13 percent (.65 volt), or greater than 93 percent (4.65 volts) in KOEO, continuous memory or KOER indicates a hard fault. Possible causes for this fault are:
    • Binding throttle linkage.
    • Damaged throttle body.
    • TP circuit open to PCM.
    • Damaged TP sensor.
    • SIG RTN circuit open to TP sensor.
    • Operator placing.
    • PCM damaged.

    For DTCs P2104, P2105 and P2106, throttle actuator control system is in FMEM mode. Possible causes for this fault are:

    • Unplugged motor, circuits shorted to power.
    • TACM motor open.
    • TACM motor stuck open or closed.
    • PCM damaged.

    The following steps should be taken in order due to the nature of the Electronic Throttle Control system:

    1. These DTCs effect system operation and must be repaired first: P0102, P0103, P0122, P0123, P0222, P0223, P0320, P0715, P0720, P0500 and P2135. See DIAGNOSTIC TROUBLE CODE DEFINITIONS .
    2. These DTCs must be repaired next due to the nature of the system: P2121, P2122, P2123, P2126, P2127, P2128, P2131, P2132 and P2133. Go to TEST DK, step 2) .
    3. If DTCs P2111 or P2112 are present, continue with this step.
    4. If DTC U0300 is present, see appropriate BODY CONTROL MODULES article.

    If should also be noted that a KOER DTC P0121 can be set by the operator resting a foot on the accelerator pedal during the test.

    Turn ignition switch to OFF position. Visually inspect the throttle plate for binding or sticking. Remove air inlet from the throttle body. Slowly push the throttle plate open and release, then push closed completely. Does the throttle plate open and close fully, without sticking? If yes, go to next step. If DTC P2100 is present, go to step  22). If DTC P2101 is present, go to step  25). If DTC P2107 is present, go to step  23). If no, repair or replace throttle body as necessary.

    2. NOTE: For additional testing information, see DIAGNOSTIC AIDS .

  2. 2) For KOEO, KOER & Continuous Memory DTC P0122: Check TP1 & TP2 Closed & Open Voltage Ranges
    Fault exhibits a symptom of limited power. A TP1 PID (TP V PID) reading less than 3.42 percent (0.17 volt) in KOEO, continuous memory or KOER, indicates a hard fault. Possible causes of this fault are:
    • Open ETC TP sensor harness.
    • Short to ground in ETC TP sensor harness.
    • Damaged TP sensor.
    • SIG RTN circuit open to TP sensor.

    Turn ignition switch to ON position, with engine off. Access TP 1 and TP 2 PIDS. Depress accelerator pedal slowly to the floor and release. Are the TP sensor signals within the following chart ranges? See ETC TP SENSOR VOLTAGE RANGES  table. If yes, go to step  9). If no, for DTCs P0121, P0122, P0221, P0222 and P2106 together, go to next step. For P0121, P2106 and 2135, and/or P0221, P0222, P2106 and P2135, go to step  4). For DTCs P0121, P0122, P2106 and P2135, and/or P0221, P0223, P2106 and P2135, go to step  5). For DTCs P0121, P0123, P2106 and P2135, or P0221, P0223, P2106 and P2135, go to step  6).

    ETC TP SENSOR VOLTAGE RANGES

    Accelerator Pedal Position TP 1 (Volts) TP 2 (Volts)
    Closed Throttle 4.0-4.4 0.9-1.5
    Wide Open Throttle 0.9-1.5 3.5-5.5

  3. 3) Check For Proper ETCREF Voltage

    Disconnect ETC TP harness connector. Turn ignition switch to ON position. Measure voltage between ETCREF and ETCRTN pins at the ETC TP sensor harness connector. See Figure . Is the voltage between 4.0 and 6.0 volts? If yes, go to next step. For P0122, go to step  4). If no, go to TEST C, step 1) .
    4. NOTE: For additional testing information, see DIAGNOSTIC AIDS .

  4. 4) For KOEO, KOER & Continuous Memory DTC P0223 & P2135: Check TP Sensor Harness For Open Circuit
    PCM flagged a fault indicating that TP1 and TP2 disagree, or that TP1 should not be in it's present position given the position of TP2 unless a problem is present. Possible causes for this fault are:
    • ETC TP is defective.
    • TP sensor shorted internally to VREF.
    • TP sensor harness is shorted to power.
    • TP sensor signal wire are shorted together.
    • Damaged PCM.

    For DTCs P0122, P2106 and P2135, check TP1 circuit only, for DTCs P0221, P0222, P2106 and P2135, check TP2 circuit only. Turn ignition switch to OFF position, remove PCM harness connector. Measure resistance between the PCM and TP sensor harness connectors for the TP1 circuit. Measure resistance between the PCM and TP sensor harness connectors for the TP2 circuit. Are both resistances less than 5 ohms? If yes, go to next step. If no, repair open circuit.

  5. 5) For KOEO, KOER & Continuous Memory DTC P0222: Check TP Sensor Harness For Short To GND

    For DTCs P0121, P0122, P2106 and P2135, check TP1 circuit only, for DTCs P0221, P0222, P2106 and P2135, check TP2 circuit only. Measure resistance between the TP1 circuit, and battery ground from the TP sensor harness connector. Measure resistance between the TP2 circuit, and battery ground from the TP sensor harness connector. Are both resistances greater than 10 k/ohms? If yes, go to next step. If no, repair short circuit.

  6. 6) Check TP Sensor Circuits For Shorts To ETCRTN

    For DTCs P0121, P0122, P2106 and P2135, check TP1 circuit only, for DTCs P0221, P0222, P2106 and P2135, check TP2 circuit only. Measure resistance between the TP1 signal and ETCRTN at PCM harness connector. Measure resistance between the TP2 signal and ETCTRN at PCM harness connector. Are both resistances greater than 10 k/ohms? If yes, go to next step. If no, isolate and repair short circuit.
    7. NOTE: For additional testing information, see DIAGNOSTIC AIDS .

  7. 7) For KOEO, KOER & Continuous Memory DTC P0123: Check TP Sensor Harness For Short To PWR
    A TP PID (TP V PID) reading greater than 93 percent (4.65 volts) in KOEO, continuous memory or KOER indicates a hard fault. Possible causes for this fault are:
    • TP sensor not seated properly.
    • TP circuit short to PWR.
    • TP circuit short to ETCREF.
    • SIG RTN circuit open to TP sensor.
    • Damaged TP sensor.
    • Damaged PCM.

    For DTCs P0121, P0123, P2106 and P2135, check TP1 circuit only, for DTCs P0221, P0223, P2106 and P2135 check TP2 circuit only. Measure resistance between the TP1 circuit, and battery power from the TP sensor harness connector. See Figure . Measure resistance between the TP2 circuit, and battery power from the TP sensor harness connector. Are both resistances greater than 10 k/ohms? If yes, go to next step. If no, repair short circuit.

  8. 8) Check TP Sensor Circuits For Shorts To ETCREFS

    For DTCs P0121, P0123, P2106 and P2135, check TP1 circuit only, for DTCs P0221, P0223, P2106 and P2135 check TP2 circuit only. Measure resistance between TP1 signal and ETCREF at PCM harness connector. Measure resistance between TP2 signal and ETCREF at PCM harness connector. Are both resistances greater than 10 k/ohms? If yes, go to next step. If no, isolate and repair short circuit.

  9. 9) Check TP Sensor Signal Shorts To Each Other In Harness

    Measure resistance between TP1 and TP2 circuits at the PCM harness connector. Is the resistance greater than 10 k/ohms? If yes, go to next step. If no, isolate and repair short circuit.

  10. 10) Check ETC TP Sensor Resistances

    Ensure PCM and TP sensor harness connectors are still unplugged. Measure resistance between ETCRTN and ETCREF through the TP sensor at closed throttle. Is the resistance between 2500 and 3600 ohms? If yes, replace PCM for On Demand faults, clear DTCs, drive vehicle, and self-test to verify repair. If DTCs output, or faults are only Continuous, go to next step. If no, replace ETC TP sensor.

  11. 11) For KOEO, KOER & Continuous Memory DTC P0068: Check TP Sensor Signal High Versus The Engine Load While Driving Vehicle

    The PCM monitors a vehicle operation rationality check by comparing sensed throttle position to mass air flow readings. If during key ON engine running self-test the comparison of the TP sensor and MAF sensor readings are not consistent with calibrated load values, the test fails and a diagnostic trouble code is stored in continuous memory. Possible causes are:
    • Air leak between MAF sensor and throttle body.
    • TP sensor not seated properly.
    • Damaged TP sensor.
    • Damaged MAF sensor.

    Connect PCM and TP sensor connectors. Turn ignition switch to ON position, start engine. Drive vehicle, exercising the throttle and TP sensor while accessing PIDS. Access TP2 PID and LOAD PID and record readings. Is TP2 PID greater than 2.44 volts and the LOAD PID reading less than 30 percent? If yes, listen for air noise around MAF sensor and throttle body while engine is running. Repair if necessary. Otherwise, go to TEST HU, step  1) for air restriction. If okay, replace the throttle body. If no, go to next step.

  12. 12) Check TP Sensor Signal Low Versus The Engine Load While Driving Vehicle

    Drive vehicle exercising the throttle and TP sensor near higher gears (preferably overdrive) while accessing PIDS. Access TPPS PID and LOAD PID. Is TP2 PID reading less than 0.64 volts and the LOAD PID reading greater than 55%? If yes, tighten TP sensor to throttle body if necessary. Clear Continuous Memory DTCs. Drive vehicle exercising the throttle. If Continuous Memory DTC P0124 or P0224 reset, replace MAF sensor. If no, unable to identify the fault at this time. Go to next step.

  13. 13) Check For Intermittent TP Sensor Signal

    Start engine and bring to idle. Run throttle up to 1500 RPM for 5 seconds. Access TP1 PID for a fault indication while lightly taping on TP sensor and wiggling harness connector to simulate road shock. Access TP2 PID for a fault indication while lightly taping on TP sensor and wiggling harness connector to simulate road shock. Are the TP1 and TP2 PIDS changing below the minimum (0.49 volt) or above the maximum (4.65 volts)? If yes, inspect the TP sensor connector. If connector is okay, replace the throttle body. If no, go to next step.

  14. 14) Check TP Sensor For Intermittent Shorts Or Opens

    Again access the TP2 PID. Turn ignition switch to ON position, with engine off. Grasp the vehicle harness closest to the TP sensor connector. Shake and bend a small section of the harness all the way to the dash panel. Wiggle, shake and bend the harness from the dash panel to the PCM. Access the TP1 PID, and repeat the above procedure. Are the TP2 PID and TP1 PID readings changing below the minimum 9.85 percent (0.49 volt) or above the maximum 93 percent (4.65 volts)? If yes, isolate and repair as necessary. If DTCS P2100 and or P2101 are present, go to next step. If not clear other DTCs, road test vehicle, and run self-test to verify repair. If no, unable to duplicate or identify fault at this time. Go to TEST Z, step 1) . If Z1 does not identify fault, replace PCM.
    NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 14) to step 20). No test procedures have been omitted.
    15. NOTE: For additional testing information, see DIAGNOSTIC AIDS .

  15. 20) For KOEO, KOER & Continuous Memory DTC P2100: Check ETC Motor Visually
    PCM fault flag is set indicating the motor circuit is open. May require cycling the key. Possible causes for this fault are:
    • TACM has an open winding.
    • TACM is damaged.
    • TACM harness is open.
    • TACM harness is shorted to power.
    • TACM harness circuits are shorted together.
    • TACM harness connector is unplugged.

    Ensure that the TACM harness connector is properly connected. Turn ignition switch to OFF position. Inspect throttle body motor for damaged housing, connector, and harness. Are there any obvious faults with the ETC motor system? If yes, repair or replace as necessary. If no, go to next step.

  16. 21) Check ETC Motor For Short Or Open

    Remove ETC motor harness connector. Measure the resistance between the TACM (+) and TACM (-) pins, through the motor. See Figure. Is the resistance less than 0.8 ohm, or greater than 1000 ohms? If yes, replace throttle body assembly. Clear DTCs and rerun self-test, if DTCs P2100, P2106 and P2112, or DTCs P2100, P2106, P2111 and P2112 are output, go to next step. For DTCs P2100, P2106 and P2107, go to step  23). For DTCs P2100, P2106, P2107, P2111 and P2112, go to step  24). For DTCs P2101, P2106, P2110, P2111 and P2112, go to step  25). If no, go to next step.

  17. 22) Check ETC Motor Harness For Open

    Turn ignition switch to OFF position. Disconnect PCM harness connector. Measure the resistance of the TACM(+) circuit between the PCM and TACM harness connectors. Measure the resistance of the TACM(-) circuit between the PCM and TACM harness connectors. Is the resistance less than 5 ohms? If yes, go to next step. If no, repair open circuit.
    18. NOTE: For additional testing information, see DIAGNOSTIC AIDS .

  18. 23) For KOEO, KOER & Continuous Memory DTC P2107: Check ETC Motor Harness For Short To GND, PWR, ETCREF, And ETCRTN
    The ETC control area of the PCM failed self-test. Fault could be the result of an incorrect TP command, or the TACM wires shorted together. Possible causes of this fault are:
    • TACM wire shorted together.
    • TACM circuit wires shorted to power.
    • PCM damaged.

    Measure the resistance between the TACM (+) pin and TACM (-) pin, and battery ground. See Figure. Measure the resistance between the TACM (+) pin and TACM (-) pin, and battery power. Measure the resistance between the TACM (+) pin and TACM (-) pin, and ETCRTN. Measure the resistance between the TACM (+) pin and TACM (-) pin, and ETCREF. Are all resistances greater than 10 k/ohms? If yes, go to next step. For DTC P2101, go to step  25). If no, isolate and repair short circuit.

  19. 24) Check ETC Motor Harness For Circuits Shorted Together

    Measure the resistance between the TACM (+) pin and TACM(-) pin. Is the resistance greater than 10 k/ohms? If yes, go to next step. If no, isolate and repair short circuit.
    20. NOTE: For additional testing information, see DIAGNOSTIC AIDS .

  20. 25) For KOEO, KOER & Continuous Memory DTCs P2101 & P2110: Check FOR Crosswired ETC Motor Harness
    Throttle actuator control system is in FMEM mode of forced limited RPM. Possible causes of this fault are:
    • PCM damaged.
    • Cross wired TACM motor.

    Measure the resistance between the TACM (+) pin and TACM(-) pin. See Figure. Is the resistance greater than 10 k/ohms? If yes, go to next step. If no, properly wire the TACM per TACM and PCM connector diagrams.

  21. 26) Self-Test Vehicle

    Turn ignition switch ON, with engine Off. Clear DTCs. Cycle accelerator pedal to the floor and back several times. Self-Test vehicle noting any DTCs. Were there any DTCs related to the ETC system? If yes, fault is intermittent. Go to TEST Z, step 1) . If no, replace PCM.
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