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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 125 (Engine Control System Self Diagnostics (2UZ-FE)) >> Diagnostic Tests >> DTC P2120, DTC P2122, DTC P2123, DTC P2125, DTC P2127, DTC P2128 &/Or DTC P2138 >> Diagnosis & Repair

Diagnosis & Repair

WARNING: This page is about a different car, the 2003 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.
  1. If Toyota hand-held tester is available, go to next step. If Toyota hand-held tester is not available, go to step  3.
  2. Connect Toyota hand-held tester to Data Link Connector (DLC3) at driver's side of instrument panel. See Figure. Turn ignition on and then turn hand-held tester on. Using hand-held tester, monitor accelerator pedal position sensor voltages for VPA1 and VPA2 circuits with accelerator pedal depressed and released. See ACCELERATOR PEDAL POSITION SENSOR VOLTAGE . If voltages are not within specification, go to next step. If voltages are within specification, replace ECM. ECM is located behind glove box. See Figure.
    ACCELERATOR PEDAL POSITION SENSOR VOLTAGE

    Accelerator Pedal Position & Circuit Identification Volts
    Accelerator Pedal Depressed
    VPA1 Circuit 2.6-4.5
    VPA2 Circuit 3.4-5.3
    Accelerator Pedal Released
    VPA1 Circuit 0.5-1.1
    VPA2 Circuit 1.2-2.0
  3. Remove glove box for access to ECM with electrical connectors still installed on ECM. See Figure. Turn ignition off. Disconnect ECM 31-pin connector E8 and accelerator pedal position sensor 6-pin connector. Check continuity between ground and accelerator pedal position sensor 6-pin connector terminals, individually. Continuity should not exist. Then, check continuity between specified accelerator pedal position sensor 6-pin connector terminals and specified ECM 31-pin connector E8 terminals. See ECM/APP SENSOR CONTINUITY . See Figure. If continuity is as specified, go to next step. If continuity is not as specified, repair or replace wires and/or connectors as necessary.
    ECM/APP SENSOR CONTINUITY

    APP Sensor Terminal No. Wire Color ECM 31-Pin Connector E8Terminal No.
    6 White/Red 22
    5 Light Green/Black 28
    4 Black/Yellow 26
    3 Red/Black 23
    2 Violet/White 29
    1 White/Blue 27
  4. Reconnect ECM 31-pin connector E8. Turn ignition is on. Using voltmeter, check voltage between ECM 31-pin connector E8 terminal No. 26 (Black/Yellow wire) No. 28 (Light Green/Black wire). See Figure. Also, check voltage between ECM 31-pin connector E8 terminal No. 27 (White/Blue wire) and No. 29 (Violet/White wire). Voltage should be 4.5-5.5 volts on both checks. If voltage readings are not within specification, replace ECM. If voltage readings are within specification, replace accelerator pedal rod assembly located at accelerator pedal.
  5. Using hand-held tester or scan tool, clear DTCs. Start engine and test drive, then allow to idle for 15 seconds or more. Check for DTCs P2120, P2122, P2123, P2125, P2127, P2128 and P2138. If DTCs exist, replace ECM. If DTCs do not exist, system is Ok at this time.
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