INSPECTION PROCEDURE 7: When the TCL Switch is Pushed On, TCL System is not Cancelled.: Diagnosis

Required Special Tools: 

• MB991223: Harness Set
• MB991997: ASC Check Harness

1. STEP 1. Measure the terminal voltage at ABS/TCL-ECU connector A-03. 
   1. Connect special tool MB991997 between the ABS/TCL-ECU and the body-side harness connector A-03.
   2. Turn the ignition switch to the "ON" position.
   3. Measure the terminal voltage between special tool MB991997 connector terminal 38 (ABS/TCL-ECU connector A-03 terminal 38) and ground.
      • When the TCL switch is not pressed, the voltage should measure battery positive voltage (approximately 12 volts).
      • When the TCL switch is pressed, the voltage should measure 1 volt or less.
   4. Turn the ignition switch to the "LOCK" (OFF) position.

   Q: Is the terminal voltage battery positive voltage when the TCL switch is not pressed, and is the terminal voltage 1 volt or less when the TCL switch is pressed? 

   YES :  Go to  Step 6.

   NO :  Go to Step 2.

   Fig 1: Measuring Terminal Voltage Between Special Tool Connector Terminal 38 And Ground

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2. STEP 2. Check the TCL switch. 
   1. Remove the TCL switch. (Refer to TCL SWITCH WHEEL SPEED SENSOR  ).
   2. Connect an ohmmeter to the TCL switch between terminals 1 and 2.
   3. Check for continuity between terminals 1 and 2 when the TCL switch is operated.
      • There is no continuity between terminals 1 and 2 when the TCL switch is not pressed.
      • There is continuity between terminals 1 and 2 when the TCL switch is pressed.
      Fig 2: Checking Continuity Between Terminals 1 And 2 Of TLC Switch

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   Q: Is there no continuity between terminals 1 and 2 when the TCL switch is not pressed, and is there continuity when the TCL switch is pressed? 

   YES :  Install the TCL switch. (Refer to TCL SWITCH ). Then go to  Step 6.

   NO :  Replace the TCL switch. (Refer to TCL SWITCH ). Then go to  Step 7.

3. STEP 3. Check ABS/TCL-ECU connector A-03, intermediate connector C-24 and TCL switch connector C-126 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Q: Are there connectors and terminals in good condition? 

   YES :  Go to Step 4.

   NO :  Repair or replace the faulty connector. (Refer to, HARNESS CONNECTOR INSPECTION ). Then go to  Step 7.

   Fig 3: Identifying Connector A-03 Terminals

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   Fig 4: Checking Intermediate Connector C-24 And TCL Switch Connector C-126

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4. STEP 4. Check the harness wire between ABS/TCL-ECU connector A-03 terminal 38 and TCL switch connector C-126 terminal 1 for damage. 

   Q: Are there harness wires in good condition? 

   YES :  Go to Step 5.

   NO :  Repair the damaged harness wire. Then go to  Step 7.

   Fig 5: Identifying Connector A-03 Terminals

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   Fig 6: Checking TCL Switch Connector C-126

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5. STEP 5. Check the harness wire between TCL switch connector C-126 terminal 2 and ground for damage. 

   Q: Is the harness wire in good condition? 

   YES :  Go to Step 6.

   NO :  Repair the damaged harness wire. Then go to  Step 7.

   Fig 7: Checking TCL Switch Connector C-126

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6. STEP 6. Retest the system 

   Q: Is TCL cancelled when the TCL switch is pushed on? 

   YES :  It can be assumed that this malfunction is intermittent. (Refer to, How to Use Troubleshooting/Inspection Service Points - HOW TO COPE WITH INTERMITTENT MALFUNCTION ).

   NO :  Replace the hydraulic unit (integrated with ABS/TCL-ECU). Then go to Step 7.

7. STEP 7. Retest the system 

   Q: Is TCL cancelled when the TCL switch is pushed on? 

   YES :  The procedure is complete.

   NO :  Return to  Step 1.