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Home >> Lexus >> 2002 >> SC 430 >> Repair and Diagnosis (Single Page) >> Brakes >> Anti-Lock Brakes >> Abs With EBD & BA & TRAC & VSC System - Diagnosis >> DTC C1224/44: Ne Signal Circuit >> Inspection Procedure

Inspection Procedure

  1. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - ECM) 
    1. Check for open and short circuit in harness and connector between terminal NEO of skid control ECU and ECM.
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK: Go to next step. 
  2. INSPECT SKID CONTROL ECU TERMINAL VOLTAGE (NEO TERMINAL) 
    1. Remove the skid control ECU with connector still connected.
    2. Turn the ignition switch ON.
    3. Measure voltage between terminal NEO (S5 - 19) of skid control ECU and body ground for the engine conditions below.

      OK: 

      ENGINE CONDITIONS AND ECU TERMINAL VOLTAGE SPECIFICATIONS

      Engine condition Voltage
      OFF (IG ON) 3 - 6 V or below 1 V
      ON (Idling) 3 - 6 V <=> below 1 V (Pulse)
      Fig 1: Measuring Voltage Between Skid Control ECU NEO Terminal & Body Ground
      G03386359Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 2: ECU Terminal Voltage Reference Graph
      G03386360Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: CHECK AND REPLACE SKID CONTROL ECU ASSY 
    2. OK: CHECK EACH CONNECTION IF SAME CODE IS STILL OUTPUT AFTER DTC DELETION (IF NORMAL, THE ECU MAY BE DEFECTIVE.) 
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