INSPECTION PROCEDURE 1: Communication between the Scan Tool and the Whole System is not possible.: Diagnosis

Required Special Tool: 

• MB991223: Harness Set

1. STEP 1. Check the power supply circuit. Measure the voltage at data link connector C-14. 

   Measure the voltage between terminal 16 and ground. It should measure approximately 12 volts (battery positive voltage).

   Q: Is battery positive voltage (approximately 12 volts) present? 

   YES:  Go to step  4.

   NO:  Go to step 2.

   Fig 1: Measuring Voltage At Data Link Connector C-14

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2. STEP 2. Check the following connectors. 
   • Data link connector C-14
     Fig 2: Checking Data Link Connector C-14

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   • Junction block connectors C-212, C-214
     Fig 3: Checking Junction Block Connectors C-212, C-214

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   • Intermediate connector C-126

   Check the connectors, 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 it and then Go to step  7.

   Fig 4: Checking Intermediate Connector C-126

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3. STEP 3. Check the following harness wire. 
   • The wire between data link connector C-14 (terminal 16) and junction block connector C-212 (terminal 1)

   Q: Is the harness wire damaged? 

   YES:  Repair or replace it and then Go to step  7.

   NO:  Go to step  7.

   Fig 5: Checking Data Link Connector C-14 (Terminal 16)

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   Fig 6: Checking Junction Block Connector C-212 (Terminal 1)

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4. STEP 4. Check the ground circuit. Measure the resistance at data link connector C-14. 

   Measure the resistance between terminal 4 and ground, and terminal 5 and ground. It should measure less than 2 ohms.

   Q: Is the resistance 2 ohms or less? 

   YES:  Replace the scan tool and then Go to step  7.

   NO:  Go to step 5.

   Fig 7: Measuring Resistance At Data Link Connector C-14

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5. STEP 5. Check the following connector. 
   • Data link connector C-14

   Check the connector, for loose, corroded or damaged terminals, or terminals pushed back in the connector.

   Q: Are the connector and terminals in good condition? 

   YES:  Go to step 6.

   NO:  Repair it and then Go to step  7.

   Fig 8: Checking Data Link Connector C-14

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6. STEP 6. Check the following harness wires. 
   • The wire between data link connector C-14 (terminal 4) and ground (No.7)
   • The wire between data link connector C-14 (terminal 5) and ground (No.7)

   Q: Is any harness wire damaged? 

   YES:  Repair or replace it and then Go to step 7.

   NO:  Go to step 7.

   Fig 9: Checking Data Link Connector C-14 (Terminal 4 And 5)

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   Fig 10: Checking Ground (No.7)

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7. STEP 7. Retest the system. 

   Q: Does the scan tool communicate with the whole system? 

   YES:  The procedure is complete.

   NO:  Return to Step  1.