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Terminals Of ECM

  1. CHECK ECM 
    Fig 1: ECM Connector Terminal Identification
    GTY313586Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the A35 and B30 ECM connectors.
    2. Measure the voltage and resistance according to the value(s) in the table below.
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A35-20 (BATT) - Body ground P - Body ground Power source circuit Always 11 to 14 V
      A35-28 (IGSW) - Body ground B - Body ground IG power source circuit Ignition switch ON 11 to 14 V
      Ignition switch off Below 1 V
      A35-29 (STP) - Body ground LG - Body ground Stop light switch signal circuit Brake pedal depressed 11 to 14 V
      Brake pedal released Below 1 V
      A35-39 (ST1-) - Body ground B - Body ground Stop light switch signal circuit Ignition switch ON, brake pedal released 11 to 14 V
      Ignition switch ON, brake pedal depressed Below 1 V
      A35-40 (CCS) - Body ground L - Body ground Cruise control main switch circuit Cruise control main switch on Below 2.5 Ω
      Cruise control main switch off 1 MΩ or higher
      +RES switch held on 235 to 245 Ω
      -SET switch held on 617 to 643 Ω
      CANCEL switch held on 1509 to 1571 Ω
      B30-104 (E1) - Body ground BR - Body ground Ground Always Below 1 Ω

      If the result is not as specified, there may be a malfunction on the wire harness side.

    3. Reconnect the A35 and B30 ECM connectors.
    4. Measure the voltage according to the value(s) in the table below.
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A35-14 (S) - Body ground*2 LG - Body ground Transmission control switch circuit Ignition switch ON, shift lever in S 11 to 14 V
      Ignition switch ON, shift lever not in S Below 1 V
      A35-16 (SFTU) - Body ground*2 Y - Body ground Transmission control switch circuit Ignition switch ON, shift lever in S 11 to 14 V
      Ignition switch ON, shift lever in "+" (up-shift) Below 1 V
      A35-16 (SFTU) - Body ground*3 Y - Body ground Shift paddle switch circuit Ignition switch ON, shift lever in D or S 11 to 14 V
      Ignition switch ON, "+" shift paddle operated (up-shift) Below 1 V
      A35-51 (SFTD) - Body ground*2 R - Body ground Transmission control switch circuit Ignition switch ON, shift lever in S 11 to 14 V
      Ignition switch ON, shift lever in "-" (down-shift) Below 1 V
      A35-51 (SFTD) - Body ground*3 R - Body ground Shift paddle switch circuit Ignition switch ON, shift lever in D or S 11 to 14 V
      Ignition switch ON, "-" shift paddle operated (down-shift) Below 1 V
      B30-30 (D) - Body ground*1 G - Body ground Clutch switch signal Ignition switch ON, clutch pedal depressed 11 to 14 V
      Ignition switch ON, clutch pedal released Below 1 V
      B30-30 (D) - Body ground*2 G - Body ground Park/neutral position switch signal Ignition switch ON, shift lever in D 11 to 14 V
      Ignition switch ON, shift lever not in D Below 1 V
      B30-32 (P) - Body ground*2 V - Body ground Park/neutral position switch signal Ignition switch ON, shift lever in P 11 to 14 V
      Ignition switch ON, shift lever not in P Below 1 V
      B30-33 (R) - Body ground*2 R - Body ground Park/neutral position switch signal Ignition switch ON, shift lever in R 11 to 14 V
      Ignition switch ON, shift lever not in R Below 1 V
      B30-34 (N) - Body ground*2 B - Body ground Park/neutral position switch signal Ignition switch ON, shift lever in N 11 to 14 V
      Ignition switch ON, shift lever not in N Below 1 V
      • *1: for Manual Transaxle
      • *2: for Automatic Transaxle
      • *3: w/ Shift Paddle Switch

      If the result is not as specified, the ECM may be malfunctioning.

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