Inspection Procedure 2: Defective Power Supply System Of The Ignition Switch: Diagnosis

WARNING: This page is about a different car, the 2012 Mitsubishi Lancer. However, it is still accessible from the selected car via links, so may be relevant.

Required Special Tools:

MB992006: Extra fine probe
MB991223: Harness set

STEP 1. Check ignition switch connector C-210 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Q: Is ignition switch connector C-210 in good condition?
- YES: Go to Step 2.
- NO: Repair the defective connector.
STEP 2. Check the battery power supply circuit to the ignition switch. Measure the voltage at ignition switch connector C-210.
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 6.
    - NO: Go to Step 3.
      
      Fig 1: Measuring Voltage Between Terminal 1 & Ground
      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
STEP 3. Check the fuse No. 14.
Q: Is the check result normal?
- YES: Go to Step 4.
- NO: Replace the fuse No. 14. (Check that there is not a short to ground in the circuit of lower reaches before replacing. If there are any problems, replace the fuse after the circuit of lower reaches is repaired.)
STEP 4. Check ETACS-ECU connector C-317 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Q: Is ETACS-ECU connector C-317 in good condition?
- YES: Go to Step 5.
- NO: Repair the damaged parts.
STEP 5. Check the Wiring harness between ignition switch connector C-210 (terminal No. 1) and ETACS-ECU connector C-317 (terminal No. 3).
- Check the battery power supply line for open circuit.
  Q: Is the check result normal?
  - YES: Go to Step 7.
  - NO: Repair the wiring harness.

STEP 6. Check the ignition switch.

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

CONTINUITY SPECIFICATION

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

Q: Is the ignition switch in good condition?

YES: Go to Step 7.
NO: Replace the ignition switch.

STEP 7. 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: Replace the ETACS-ECU.