Inspection Procedure 1: Power supply circuit check: Diagnosis

Required Special Tools:

MB991223: Harness Set
MB992006: Extra Fine Probe
MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: Vehicles Communication Interface (V.C.I.)
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A (Vehicles with CAN communication system)

STEP 1. Using scan tool MB991958, read the combination meter diagnostic trouble code.
Check if DTC is set to the combination meter.

CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
1. Connect scan tool MB991958. Refer to "HOW TO CONNECT THE SCAN TOOL (M.U.T.-III) ."
2. Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
3. Check if DTC is set.
4. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
1. YES: Troubleshoot the combination meter (Refer to DIAGNOSTIC TROUBLE CODE CHART ).
2. NO: Go to Step 2.
  
  Fig 1: Scan Tool And Laptop Connection
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
STEP 2. Check combination meter connector C-04 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Q: Is combination meter connector C-04 in good condition?
1. YES: Go to Step 3.
2. NO: Repair the defective connector.
STEP 3. Check the battery power supply circuit to the combination meter. Measure the voltage at combination meter connector C-04.
1. Disconnect the connector, and measure at the wiring harness side.
2. Turn the ignition switch to the LOCK (OFF) position.
3. 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)?
1. YES: Go to Step 5.
2. NO: Go to Step 4.
  
  Fig 2: Measuring Voltage Between C-04 Terminal 1 And Ground
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
STEP 4. Check the wiring harness between combination meter connector C-04 (terminal 1) and the fusible link (36).
- Check the power supply line (battery supply) for open circuit and short circuit.
NOTE: Also check ETACS-ECU connectors C-307 and C-317 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If ETACS-ECU connector C-307 and C-317 is damaged, repair or replace the damaged component(s) as described in HARNESS CONNECTOR INSPECTION .

Q: Is the wiring harness between combination meter connector C-04 (terminal 1) and the fusible link (36) in good condition?
1. YES: The trouble can be an intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
2. NO: Repair the wiring harness.
STEP 5. Check the battery power supply circuit to the combination meter. Measure the voltage at combination meter connector C-04.
1. Disconnect the connector, and measure at the wiring harness side.
2. Turn the ignition switch to the ON position.
3. Measure the voltage between terminal 2 and ground.
  - The voltage should measure approximately 12 volts (battery positive voltage).
Q: Is the measured voltage approximately 12 volts (battery positive voltage)?
1. YES: Go to Step 8.
2. NO: Go to Step 6.
  
  Fig 3: Measuring Voltage Between C-04 Terminal 2 And Ground
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

STEP 6. Using scan tool MB991958, check data list.

Check the input signal from the ignition switch (IG1) in the ETACS-ECU.

Check the ETACS data list.

Turn the ignition switch to the "ON" position.

Item No.	Item name	Normal condition
Item 254	IG voltage	Approximately 12 volts (battery positive voltage)

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

Q: Do the scan tool MB991958 display the item "IG voltage" is normal condition?

YES: Go to Step 7.
NO: Troubleshoot the ETACS-ECU. Refer to INSPECTION PROCEDURE 2: MALFUNCTION OF THE IGNITION SWITCH (IG1) INPUT/OUTPUT SIGNAL ."

STEP 7. Check the wiring harness between combination meter connector C-04 (terminal 2) and the fusible link (34).
- Check the power supply line (battery supply) for open circuit and short circuit.
NOTE: Also check joint connector C-03, ETACS-ECU connectors C-309 and C-317 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If joint connector C-03, ETACS-ECU connector C-309 or C-317 is damaged, repair or replace the damaged component(s) as described in HARNESS CONNECTOR INSPECTION .

Q: Is the wiring harness between combination meter connector C-04 (terminal 2) and the fusible link (34) in good condition?
1. YES: The trouble can be an intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
2. NO: Repair the wiring harness.
STEP 8. Check the ground circuit to the combination meter. Test at combination meter connector C-04.
1. Disconnect combination meter connector C-04 and measure the resistance available at the wiring harness side of the connector.
2. Measure the resistance value between terminal 13 and ground.
  - The resistance should be 2 ohms or less.
Q: Is the measured resistance 2 ohms or less?
1. YES: Go to Step 10.
2. NO: Go to Step 9.
  
  Fig 4: Measuring Resistance Between C-04 Terminal 13 And Ground
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
STEP 9. Check the wiring harness between combination meter connector C-04 (terminal 13) and ground.
- Check the ground wire for open circuit.
Q: Is the wiring harness between combination meter connector C-04 (terminal 13) and ground in good condition?
1. YES: The trouble can be an intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
2. NO: Repair the wiring harness.
STEP 10. Retest the system.
Check that the combination meter works normally.

Q: Is the check result satisfactory?
1. YES: The trouble can be an intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
2. NO: Replace the combination meter.