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Diagnosis & Repair

WARNING: This page is about a different car, the 2002 Lexus ES 300. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Toyota hand-held tester can be used to confirm PNP switch signal from CURRENT DATA.
  1. Warm up engine. Turn ignition off. Connect scan tool to DLC No. 3. See Figure. Turn ignition on and push scan tool main switch on. Move shift lever to R, D, 4, 3, 2 and L positions. Select REVERSE, 5TH/DRIVE, 4TH, 3RD, 2ND and LOW in DATALIST and read its value displayed on scan tool. See Fig 1. If diagnosis indicates park/neutral position switch is okay, replace ECM. If diagnosis indicates park/neutral switch is not okay, go to next step.
  2. Disconnect PNP switch harness connector. See Fig 2. Check continuity between appropriate PNP switch terminals (component side) with shift lever in appropriate position. See PARK/NEUTRAL POSITION SWITCH CONTINUITY  table. If problem exists, replace PNP switch. If problem does not exist, go to next step.
    Fig 1: Scan Tool Diagnosis
    G00131760Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 2: Identifying Park/Neutral Position Switch Terminals
    G00131758Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    PARK/NEUTRAL POSITION SWITCH CONTINUITY

    Shift Lever Position Continuity Between Terminals No.
    Park 1 & 3; 6 & 9
    Reverse 2 & 3
    Neutral 3 & 5; 6 & 9
    Drive & 4 3 & 7
    3 3 & 4
    2 & Low 3 & 8
  3. Connect park/neutral position switch connector. Disconnect transmission control switch connector. See Fig 3. Check continuity between each terminal in SHIFT LOCK CONTROL CONTINUITY  table when shift lever is moved to each position. If continuity is present, replace shift lock control unit assembly. If continuity is not present, go to next step.
    Fig 3: Identifying Transmission Control Switch Connector
    G00131759Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    SHIFT LOCK CONTROL CONTINUITY

    Shift Position Continuity Between Terminals No.
    P 4-6, 1-3
    R 4-6, 1-3
    N 4-6, 1-3
    D 4-6, 1-3
    4 4-6, 1-2
    3 4-6, 1-2
    2 4-6, 1-3
    L 5-6, 1-3
  4. Access ECM behind glove box. Turn ignition on. Using DVOM, backprobe ECM harness connector and measure voltage between ground and specified terminals at ECM harness connector E7 with shift lever in appropriate position. See PARK/NEUTRAL POSITION SWITCH VOLTAGE  table. See Figure. If voltage is as specified, no problem is indicated at this time. If voltage is not as specified, go to next step.
    PARK/NEUTRAL POSITION SWITCH VOLTAGE

    Shift Lever Position (1) ECM Terminal No. (Wire Color) Volts
    Reverse 11 (Red/Black) 10-14
    Drive 10 (White/Blue) 10-14
    2 9 (Yellow) 10-14
    3 20 (Blue/White) 10-14
    4 23 (Yellow/Black) 10-14
    Low 8 (Blue/Black) 10-14
    (1) Measure voltage between ECM connector E8 terminal No. 1 (E1-Brown wire) and appropriate ECM connector E7 terminal.
  5. Check wiring between battery and PNP switch, and between PNP switch and ECM. See WIRING DIAGRAMS article. If problem exists, repair wiring as necessary. If problem does not exist, replace ECM.
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