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Home >> Toyota >> 2004 >> Highlander Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 473 (Cruise Control System - Diagnostics) >> Cruise Control System (April, 2003) >> DTC 21, 23: Open Vehicle Speed Sensor Circuit & Vehicle Speed Signal Abnormal >> Circuit Description >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2004 Toyota Corolla and 2003 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.
  1. INPUT SIGNAL CHECK 
    1. See input signal check on page 05-745.
    2. Check indicator light operation when driving with vehicle speed above 40 km/h (25 mph), and with vehicle speed below 40 km/h (25 mph).

      OK: 

      Vehicle speed above 40 km/h (25 mph): 

      Indicator light blinks 

      Vehicle speed below 40 km/h (25 mph): 

      Indicator light stays ON 

      Fig 1: Checking Input Signal
      G02861213Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE (See  PROBLEM SYMPTOMS TABLE  ) 
    2. NG: GO TO NEXT STEP. 
  2. CHECK SPEEDOMETER CIRCUIT (See  TERMINALS OF ECU  ) 
    1. NG: REPAIR OR REPLACE HARNESS, CONNECTOR OR COMBINATION METER ASSEMBLY 
    2. OK: GO TO NEXT STEP. 
  3. CHECK HARNESS AND CONNECTOR (BETWEEN CRUISE CONTROL ECU ASSY AND COMBINATION METER ASSEMBLY) 
    1. Check for open and short circuit in harness and connector between cruise control ECU assy and combination meter assembly (See ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK: CHECK AND REPLACE CRUISE CONTROL ECU ASSY (See  ELECTRONIC CIRCUIT INSPECTION PROCEDURE  ) 
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