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Home >> Toyota >> 2004 >> Highlander Limited, FWD >> Repair and Diagnosis >> Brakes >> Anti-Lock Brakes >> Abs With EBD & BA & TRAC & VSC System - Diagnostics >> DTC C1224/44: Ne Signal Circuit >> Inspection Procedure

Inspection Procedure

  1. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - ECM) 
    1. Disconnect the skid control ECU connector and the ECM connector.
    2. Measure the resistance according to the value (s) in the table below.

      Standard: 

      SPECIFICATION TESTER CONNECTION

      Tester Connection Specified Condition
      S27-10 (NEO) - E5-17 (NEO) Below 1 Ω
    3. Measure the resistance according to the value (s) in the table below.

      Standard: 

      SPECIFICATION TESTER CONNECTION

      Tester Connection Specified Condition
      S27-10 (NEO) - Body ground 10 kΩ or higher
      Fig 1: Disconnecting Skid Control ECU Connector And ECM Connector
      G02908654Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK: GO TO NEXT STEP. 
  2. INSPECT ECM TERMINAL VOLTAGE (NEO TERMINAL) 
    1. Reconnect the ECM connector and the skid control ECU connector.
    2. Check the signal waveform between terminal NEO (E5-17) of the ECM and body ground for the engine conditions below.

      OK: 

      ENGINE CONDITION SPECIFICATION

      Tester Connection Engine Condition Specified condition
      E5-17 (NEO) Body ground OFF (Ignition switch ON) 4.5 to 14 V or below 1V
      E5-17 (NEO) Body ground ON (Idling) Pulse generation (4.5 to 14 V <-> below 1 V)
      Fig 2: Inspecting ECM Terminal Voltage (NEO Terminal)
      G02908655Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 3: Checking Signal Waveform Between Terminal
      G02908656Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPLACE ECM 
    2. OK: GO TO NEXT STEP. 
  3. CHECK IF SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED 
    1. NG: CONNECT CONNECTOR TO ECU 
    2. OK: GO TO NEXT STEP. 
  4. RECONFIRM DTC 
    1. Clear the DTCs (see PRE-CHECK ).
    2. Turn the ignition switch to the ON position.
    3. Are the same DTCs recorded?
    1. NO: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (See  PROBLEM SYMPTOMS TABLE  ) 
    2. YES: REPLACE ABS & TRACTION ACTUATOR ASSY (See  REPLACEMENT  ) 
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