INSPECTION PROCEDURE 1: Communication between the Scan Tool and all the Systems is Not Possible.: Diagnosis

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 Between Terminal 16 And Ground
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
STEP 2. Check the following connectors.
- Data link connector C-14
  
  Fig 2: Identifying Data Link Connector C-14 Terminal
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
- Junction block connectors C-212, C-214
  
  Fig 3: Identifying Junction Block Connectors C-212, C-214 Terminal
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
- 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: Identifying Intermediate Connector C-126 Terminal
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
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: Identifying Data Link Connector C-14 Terminal
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Fig 6: Identifying Junction Block Connector C-212 Terminal
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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 Between Terminal 4, 5 And Ground
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
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: Identifying Data Link Connector C-14 Terminal
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
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: Identifying Data Link Connector C-14 Terminal
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Fig 10: Identifying Grounding Wire No.7
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
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.