Malfunction of the ignition switch power supply system: Diagnosis

Required Special Tools: 

• MB992006: Extra fine probe
• MB991223: Harness set

1. STEP 1. Check ignition switch connector C-308 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Q: Is ignition switch connector C-308 in good condition? 

   • YES:  Go to Step 2.
   • NO:  Repair the defective connector.
     Fig 1: Identifying Connector C-308

     Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
2. STEP 2. Check the battery power supply circuit to the ignition switch. Measure the voltage at ignition switch connector C-308. 
   1. Disconnect the connector, and measure at the wiring harness side.
   2. Measure the voltage between terminal 1 and ground.
      • The voltage should measure approximately 12 volts (battery positive voltage).

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

      • YES:  Go to Step  4.
      • NO:  Go to Step 3.
        Fig 2: Identifying Connector C-308

        Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
        Fig 3: Measuring Voltage Between Terminal 1 And Ground

        Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
3. STEP 3. Check the Wiring harness between ignition switch connector C-308 (terminal No. 1) and fusible link (4). 
   NOTE: Prior to the wiring harness inspection, check intermediate connector C-24, and repair if necessary.
   • Check the battery power supply line for open circuit.

     Q: Is the check result normal? 

     • YES:  Go to Step  5.
     • NO:  Repair the wiring harness.
       Fig 4: Identifying Connector C-24

       Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
4. STEP 4. Check the ignition switch. 

   Remove the ignition switch. Then check continuity between the switch terminal.

   IGNITION KEY POSITION CHART
   
   

   Ignition key position	Terminal number	Normal condition
   LOCK	1-2, 1-4, 1-5, 1-6	No continuity
   ACC	1-6	Continuity exists (2 ohms or less)
   ON	1-2, 1-4, 1-6	Continuity exists (2 ohms or less)
   START	1-2, 1-5	Continuity exists (2 ohms or less)

   Q: Is the ignition switch in good condition? 

   • YES:  Go to Step 5.
   • NO:  Replace the ignition switch.
5. STEP 5. Retest the system. 

   Q: When the ignition switch is operated, do the equipment and system work normally? 

   • YES:  The trouble can be an intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
   • NO:  Return to Step  1.