INSPECTION PROCEDURE 4: Rear washer does not work normally: 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
  • MB991911: M.U.T.-III Main harness B

1. STEP 1. Verify the windshield washers. 

   Q: Does the windshield washers operate? 

   • YES:  Go to Step 2.
   • NO:  Refer to "INSPECTION PROCEDURE 10: THE WINDSHIELD WASHER DOES NOT WORK NORMALLY ."
2. STEP 2. Verify the rear wiper. 

   Q: Does the rear wiper operate? 

   • YES:  Go to Step 3.
   • NO:  Refer to INSPECTION PROCEDURE 1 "REAR WIPER DOES NOT WORK.  ."
3. STEP 3. Use the scan tool MB991958 to check if an ETACS-related diagnostic trouble code is set. 

   Connect the scan tool. Refer to "DIAGNOSTIC FUNCTION ."

   Q: Is the diagnostic trouble code set? 

   • YES:  Diagnose the ETACS-ECU. Refer to "DIAGNOSTIC TROUBLE CODE CHART ."
   • NO:  Go to Step 4.
     Fig 1: Connecting Scan Tool To Data Link Connector

     Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
4. STEP 4. Check the input signal related to the rear washer operation. 
   • Ignition switch: ACC
   • Rear washer switch: ON

     Item No.	Item name	Normal condition
     Item 357	Rear wiper (washer)	ON

     OK: Normal condition is displayed. 

   Q: Is the check result normal? 

   • NO:  Go to Step 5.
   • YES:  Refer to TROUBLE SYMPTOM CHART FOR INPUT SIGNAL .
5. STEP 5. Check the washer motor. 
   1. Disconnect the washer motor connector A-54.
   2. Fill the windshield washer tank with washer fluid.
   3. When battery voltage is applied between terminals 1 and 2, washer fluid should spray out.

   Q: Does the washer motor operate normally? 

   • YES:  Go to Step 6.
   • NO:  Replace the washer motor. Verify that the rear washer works normally.
     Fig 2: Inspecting Rear Washer Hose Operation

     Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
6. STEP 6. Replace the ETACS-ECU, and then check its operation. 

   Replace the ETACS-ECU, and then check that the rear washer works normally.

   1. Replace the ETACS-ECU.
   2. Ignition switch: ON
   3. The rear washer should now work normally.

   Q: Is the check result satisfactory? 

   • YES:  Intermittent malfunction. Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .
   • NO:  Replace the front-ECU.