DTC 31: Transfer Shift Lever Switch System: Diagnosis

Required Special Tool: 

• MB991502: Scan Tool (MUT-II)

1. STEP 1. Using scan tool MB991502, check data list item 06: Transfer Shift Lever Position. 
   CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.
   1. Connect scan tool MB991502 to the data link connector.
      Fig 1: Connecting Scan Tool MB991502 To Data Link Connector

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   2. Turn the ignition switch to the "ON" position.
   3. Set scan tool MB991502 to data reading mode for item 06, Transfer Shift Lever Position.
      • Display should be the same as the actual transfer shift lever position.
   4. Turn the ignition switch to the "LOCK" (OFF) position.

   Q: Is switch operating properly? 

   1. YES :  If can be assumed that this malfunction is intermittent. Refer to HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE POINTS - How to Cope with Intermittent Malfunction.
   2. NO :  Go to Step 2.
2. STEP 2. Check the transfer shift lever switch. 

   Check for resistance between terminals for each transfer shift lever position.

   Fig 2: Transfer Shift Lever Switch Resistance Reference Chart

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   Fig 3: Checking Transfer Shift Lever Switch

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   Q: Is switch operating properly? 

   1. YES :  Go to Step 3.
   2. NO :  Replace the transfer shift lever switch. Refer to TRANSMISSION CONTROL .
3. STEP 3. Measure the power supply voltage at transfer shift lever switch connector E-116. 
   1. Disconnect connector E-116 and measure at harness side.
      Fig 4: Identifying Transfer Shift Lever Switch Connector E-116 Location And Terminal View

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   2. Turn the ignition switch to the "ON" position.
   3. Measure the voltage between terminal 1 and ground.
      • The voltage should measure battery positive voltage.
      Fig 5: Measuring Voltage Between Terminal 1 And Ground

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   4. Turn the ignition switch to the "LOCK" (OFF) position.

   Q: Is the measured voltage battery positive voltage? 

   1. YES :  Go to Step  6 .
   2. NO :  Go to Step 4.
4. STEP 4. Check joint connector D-01, junction block connector D-208, D-212, intermediate connector E-11 and transfer shift lever switch connector E-116 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 
   Fig 6: Identifying Joint Connector D-01 Location And Terminal View

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   Fig 7: Identifying Junction Block Connectors D-208 And D-212 Location And Terminals View

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   Fig 8: Identifying Intermediate Connector E-11 Location And Terminal View

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   Fig 9: Identifying Transfer Shift Lever Switch Connector E-116 Location And Terminal View

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   Q: Are the connectors and terminals in good condition? 

   1. YES :  Go to Step 5.
   2. NO :  Repair or replace the damaged components. Refer to HARNESS CONNECTOR INSPECTION .
5. STEP 5. Check harness for open circuit or short circuit to ground between junction block connector D-208 terminal 2 and transfer shift lever switch connector E-116 terminal 1. 
   Fig 10: Identifying Junction Block Connector D-208 Location And Terminal View

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   Fig 11: Identifying Transfer Shift Lever Switch Connector E-116 Location And Terminal View

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   Q: Is the harness wire in good condition? 

1. YES :  Go to Step  10 .
2. NO :  Repair or replace the harness wire.
3. STEP 6. Measure the switch output voltage at transfer-ECU connector E-109 by backprobing. 
   1. Disconnect connector E-109 and measure at the harness side.
      Fig 12: Identifying Transfer-ECU Connector E-109 Location And Terminal View

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   2. Turn the ignition switch to the "ON" position.
   3. Measure the voltage between terminal 20 (Transfer shift lever position: 2H) and ground by backprobing. [terminal 21 (Transfer shift lever position: 4H), terminal 22 (Transfer shift lever position: 4HLc), terminal 23 (Transfer shift lever position: 4LLc) and ground by backprobing.]
      • The voltage should measure battery positive voltage.
      Fig 13: Measuring Switch Output Voltage At Transfer-ECU Connector E-109 By Backprobing

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   4. Turn the ignition switch to the "LOCK" (OFF) position.

   Q: Is the measured voltage battery positive voltage? 

   1. YES :  Go to Step  9 .
   2. NO :  Go to Step 7.
4. STEP 7. Check transfer-ECU connector E-109 and transfer shift lever switch connector E-116 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 
   Fig 14: Identifying Transfer-ECU Connector E-109 Location And Terminal View

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   Fig 15: Identifying Transfer Shift Lever Switch Connector E-116 Location And Terminal View

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   Q: Are the connectors and terminals in good condition? 

   1. YES :  Go to Step 8.
   2. NO :  Repair or replace the damaged components. Refer to HARNESS CONNECTOR INSPECTION .
5. STEP 8. Check harness for open circuit or short circuit to ground between transfer-ECU connector E-109 terminal 20 (21, 22 and 23) and transfer shift lever switch connector E-116 terminal 3 (5, 6 and 2). 
   Fig 16: Identifying Transfer-ECU Connector E-109 Location And Terminal View

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   Fig 17: Identifying Transfer Shift Lever Switch Connector E-116 Location And Terminal View

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   Q: Is the harness wire in good condition? 

   1. YES :  Go to Step  10 .
   2. NO :  Repair or replace the harness wire.
6. STEP 9. Check transfer-ECU connector E-109 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 
   Fig 18: Identifying Transfer-ECU Connector E-109 Location And Terminal View

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   Q: Are the connector and terminals in good condition? 

   1. YES :  Go to Step 10.
   2. NO :  Repair or replace the damaged components. Refer to HARNESS CONNECTOR INSPECTION .
7. STEP 10. Using scan tool MB991502, check data list item 06: Transfer Shift Lever Position. 
   CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.
   1. Connect scan tool MB991502 to the data link connector.
      Fig 19: Connecting Scan Tool MB991502 To Data Link Connector

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   2. Turn the ignition switch to the "ON" position.
   3. Set scan tool MB991502 to data reading mode for item 06, Transfer Shift Lever Position.
      • Display should be the same as the actual transfer shift lever position.
   4. Turn the ignition switch to the "LOCK" (OFF) position.

   Q: Is switch operating properly? 

   1. YES :  If can be assumed that this malfunction is intermittent. Refer to HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE POINTS - How to Cope with Intermittent Malfunction.
   2. NO :  Replace the transfer-ECU.