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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 P0120, DTC P0122, DTC P0123, DTC P0220, DTC P0222, DTC P0223 &/Or DTC P2135 >> 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  4.
  2. Connect 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.
  3. Using hand-held tester or OBD II (enhanced) scan tool, monitor throttle valve opening in the DATA LIST for VTA1 and VTA2 circuits with accelerator pedal released and with accelerator pedal depressed. VTA1 circuit is displayed as a percentage and VTA2 circuit is displayed as a voltage. With accelerator pedal released, VTA1 circuit should be 10-24 percent and VTA2 circuit should be 2.1-3.1 volts. With accelerator pedal depressed, VTA circuit should be 64-96 percent and VTA2 circuit should be 4.5-5.5 volts. If throttle valve opening readings are not within specification, go to next step. If throttle valve opening readings are within specification, replace ECM. ECM is located behind glove box. See Figure.
  4. Remove glove box for access to ECM with electrical connectors still installed on ECM. See Figure.
  5. Turn ignition off. Disconnect TP sensor 6-pin connector and ECM 34-pin connector E4. See Fig 1. Check continuity between TP sensor and ECM connectors terminals. See CONTINUITY CHECK BETWEEN TP SENSOR & ECM CONNECTORS  for terminal selections. If continuity is as specified, go to next step. If continuity is not as specified, repair or replace harness and connectors as necessary.
    CONTINUITY CHECK BETWEEN TP SENSOR & ECM CONNECTORS

    TP Sensor & ECM Terminals No.
    (Wire Color)    		 Specified Condition Of Wire
    No. 5 & No. 18
    (Blue/Red)    		 Continuity
    No. 6 & No. 21
    (Yellow)    		 Continuity
    No. 4 & No. 31
    (Red/Black)    		 Continuity
    No. 3 & No. 28
    (Brown)    		 Continuity
    No. 5 & Body Ground
    (Blue/Red)    		 No Continuity
    No. 6 & Body Ground
    (Yellow)    		 No Continuity
    No. 4 & Body Ground
    (Red/Black)    		 No Continuity
  6. Reconnect ECM 34-pin connector E4. Turn ignition on. Measure voltage between ECM terminals No. 18 (Blue/Red wire) and No. 28 (Brown wire). See Figure. This is the E2 and VC terminals on ECM. Voltage should be 4.5-5.5 volts. If voltage is within specification, replace throttle body with motor assembly, then, go to next step. See THROTTLE BODY under FUEL SYSTEMS in REMOVAL, OVERHAUL & INSTALLATION - V6 & V8 article. If voltage is not within specification, replace ECM.
  7. Using hand-held tester or OBD II scan tool, clear DTC(s). See CLEARING DIAGNOSTIC TROUBLE CODES . Start engine and allow engine to idle for 15 seconds or more. Check for DTCs. If DTCs are set, replace ECM. If no DTCs are set, troubleshooting is complete.
Fig 1: Identifying TP Sensor Circuit, Connector & Terminals
G00228904Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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