INSPECTION PROCEDURE 4: When the Selector Lever is Moved to "N" Range, Auto-cruise Control is not Cancelled. < A/T >: Diagnosis

Required Special Tool: 

• MB991223: Harness Set

1. STEP 1. Measure the signal voltage at auto-cruise control-ECU connector C-21 by backprobing. 
   1. Do not disconnect auto-cruise control-ECU connector C-21.
   2. Turn the ignition switch to the "ON" position.
      Fig 1: Disconnecting Auto-Cruise Control-ECU Connector C-21

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   3. Measure the voltage between auto-cruise control-ECU connector C-21 terminal 13 and ground by backprobing.
      • The voltage should measure battery positive voltage. (When select lever is in a position other than "N" range).
      • The voltage should measure 0.5 volt or less. (When select lever is in "N" range).
   4. Turn the ignition switch to the "LOCK" (OFF) position.

   Q: Are all of the measured voltages satisfied? 

   YES  : Check that the malfunction is eliminated. If the malfunction is eliminated, it can be assumed that this malfunction is intermittent. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTIONS ). If the malfunction is not eliminated, replace the auto-cruise control-ECU (Refer to AUTO-CRUISE CONTROL  ), and then go to  Step 5.

   NO:  Go to Step 2.

   Fig 2: Measuring Voltage Between Auto-Cruise Control-ECU Connector C-21 Terminal 13 And Ground

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2. STEP 2. Check transmission range switch connector B-111, auto-cruise control-ECU connector C-21 and intermediate connector C-25 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Q: Are the connectors and terminals in good condition? 

   YES  : Go to Step 3.

   NO:  Repair or replace the faulty connector. (Refer to , HARNESS CONNECTOR INSPECTION ). Go to  Step 5.

   Fig 3: Checking Transmission Range Switch Connector B-111

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   Fig 4: Checking Auto-Cruise Control-ECU Connector C-21

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   Fig 5: Checking Intermediate Connector C-25

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3. STEP 3. Check the circuit at the park/neutral position switch. 
   1. Disconnect the transmission range switch connector B-111.
      Fig 6: Disconnecting Transmission Range Switch Connector B-111

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   2. Measure the continuity between transmission range switch connector terminals.
      TERMINAL CONNECTOR SPECIFIED CONDITION CHART
      
      

      ITEMS	TERMINAL CONNECTOR OF TESTER	SPECIFIED CONDITION
      P	3 - 8, 9 - 10	Less than 2 ohms.
      N	4 - 8, 9 - 10

   Q: Is the continuity meet the table above? 

   YES  : Go to Step 4.

   NO:  Replace the transmission range switch. (Refer to TRANSMISSION ). Go to  Step 5.

   Fig 7: Measuring Continuity Between Transmission Range Switch Connector Terminals

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4. STEP 4. Check the harness wire between transmission range switch connector B-11 terminal 10 and auto-cruise control-ECU connector C-21 terminal 13 for damage. 

   Q: Is the harness wire in good condition? 

   YES  : Check that the malfunction is eliminated. If the malfunction is eliminated, it can be assumed that this malfunction is intermittent. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTIONS ). If the malfunction is not eliminated, replace the auto-cruise control-ECU (Refer to AUTO-CRUISE CONTROL  ), and then go to Step 5.

   NO:  Repair the damaged harness wire. Go to Step 5.

   Fig 8: Checking Harness Wire Between Transmission Range Switch Connector B-11

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   Fig 9: Checking Auto-Cruise Control-ECU Connector C-21

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5. STEP 5. Check that the malfunction is eliminated. 

   Q: Is the malfunction eliminated? 

   YES  : This procedure is complete.

   NO:  Go to  Step 1.