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Home >> Mitsubishi >> 2006 >> Lancer Evolution L4-2.0L DOHC Turbo >> Repair and Diagnosis >> Body and Frame >> Body Control Systems >> Testing and Inspection >> Symptom Related Diagnostic Procedures >> Symptom Diagnostic Procedures >> Inspection Procedure H-1

Inspection Procedure H-1

INSPECTION PROCEDURE H-1:Rear Wiper and Washer: Rear wiper does not work at all.

NOTE: This troubleshooting procedure requires the use of scan tool MB991958 and SWS monitor kit MB991813. For details on how to use the SWS monitor, refer to "How to use SWS monitor."

Rear Wiper Motor Power Supply Circuit Part 1:




Rear Wiper Motor Power Supply Circuit Part 2:






CIRCUIT OPERATION
- The rear wiper switch sends a signal through the column-ECU (incorporated in the column switch) to the ETACS-ECU. If the column-ECU sends a rear wiper switch "ON" signal to the ETACS-ECU, the ETACS-ECU turns on the relay (incorporated in the ETACS-ECU), thus causing the rear wiper motor to be turned on.
- The ETACS-ECU operates the rear wiper according to the following switches:
- Ignition switch (ACC)
- Rear wiper switch

TECHNICAL DESCRIPTION (COMMENT)
If the rear wiper does not work normally, the input circuit system from the switches, the rear wiper motor, the column switch (windshield wiper and windshield washer switch) or the ETACS-ECU may be defective (refer to "CIRCUIT OPERATION").

TROUBLESHOOTING HINTS
- Trouble in input signal system
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector
- The rear wiper motor may be defective
- The ETACS-ECU may be defective

DIAGNOSIS

Required Special Tools:
- MB991223: Harness Set
- MB992006: Extra Fine Probe
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: M.U.T.-III USB Cable
- MB991911: M.U.T.-III Main Harness B
- MB991813: SWS monitor kit
- MB991806: SWS monitor cartridge
- MB991812: SWS monitor harness (for column-ECU)
- MB991922: Probe harness

STEP 1. Use scan tool MB991958 to select "ECU COMM Check" on the SWS monitor display.
Check the following ECUs:
- Column-ECU
- Front-ECU

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. Connect special tool MB991911 before connecting special tool MB991812. Be sure to connect special tool MB991806 after turning on special tool MB991824.




1. Connect the special tool. Refer to "How to connect SWS monitor."
2. Turn the ignition switch to the "ON" position.
3. Operate scan tool MB991958 according to the procedure below to display "ECU COMM Check."
a. Select "Interactive Diagnosis."
b. Select "System select."
c. Select "SWS."
d. Select "SWS MONITOR."
e. Select "ECU COMM Check."

4. Scan tool MB991958 should show "OK" on the "ECU COMM Check" menus for both the "COLUMN ECU" and the "FRONT ECU" menus.

Q: Is "OK" displayed on both the "COLUMN ECU" and "FRONT ECU" menu?

YES <"OK" are displayed for all the items> : Go to Step 2.

NO <"NG" is displayed on the "COLUMN ECU" menu> : Refer to Inspection Procedure A-2 "Communication with the column switch (column-ECU) is not possible."

NO <"NG" is displayed on the "FRONT ECU" menu> : Refer to Inspection Procedure A-4 "Communication with the front-ECU is not possible."

STEP 2. Check the input signal by using "FUNCTION DIAG." menu of the SWS monitor.
Check the input signals from the following switches:
- ignition switch: ACC
- rear wiper switch: INT




1. Operate scan tool MB991958 according to the procedure below to display "REAR WIPER."
a. Select "Interactive Diagnosis."
b. Select "System select."
c. Select "SWS."
d. Select "SWS MONITOR."
e. Select "Function Diag."
f. Select "REAR WIPER."




2. Check that normal conditions are displayed on the items described in the table.

Q: Does scan tool MB991958 display the items "REAR WIPER SW" and "IG SW (ACC)" as normal condition?

YES : Go to Step 3.

NO : Refer to Inspection Procedure N-7 "The ETACS-ECU does not receive any signal from the rear wiper switch."

NO : Refer to Inspection Procedure N-1 "The ETACS-ECU does not receive any signal from the ignition switch (ACC)."




STEP 3. Check rear wiper motor connector F-05 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is rear wiper motor connector F-05 in good condition?

YES: Go to Step 4.

NO: Repair or replace the damaged components). Refer to Harness Connector Inspection. Verify that the rear wiper now works normally.

STEP 4. Check the rear wiper motor.




1. Disconnect rear wiper motor connector F-05.
2. Connect a battery to the rear wiper motor as shown, and check the rear wiper motor.

Q: Does the rear wiper motor operate normally?

YES: Go to Step 5.

NO: Replace the rear wiper motor (Refer to Rear wiper and washer). Verify that the rear wiper should now work normally.

STEP 5. Check the ground circuit to the rear wiper motor. Measure the resistance at rear wiper motor connector F-05.




1. Disconnect rear wiper motor connector F-05 and measure the resistance available at the wiring harness side of the connector.




2. Measure the resistance value between terminal 1 and ground.
- The resistance should equal 2 ohms or less.

Q: Is the measured resistance 2 ohms or less?

YES: Go to Step 7.

NO: Go to Step 6.




STEP 6. Check the wiring harness between rear wiper motor connector F-05 (terminal 1) and ground.

Q: Is the wiring harness between rear wiper motor connector F-05 (terminal 1) and ground in good condition?

YES: No action is necessary and testing is complete.

NO: The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. Verify that the rear wiper now works normally.




STEP 7. Check ETACS-ECU connector C-226 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is ETACS-ECU connector C-226 in good condition?

YES: Go to Step 8.

NO: Repair or replace the damaged components). Refer to Harness Connector Inspection. Verify that the rear wiper now works normally.










STEP 8. Check the wiring harness between rear wiper motor connector F-05 (terminal 2) and ETACS-ECU connector C-226 (terminal 16).

NOTE: Also check junction block connector C-217 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If junction block connector C-217 is damaged, repair or replace the damaged components) as described in Harness Connector Inspection.

Q: Is the wiring harness between rear wiper motor connector F-05 (terminal 2) and ETACS-ECU connector C-226 (terminal 16) in good condition?

YES: Replace the ETACS-ECU. Verify that the rear wiper should now work normally.

NO: The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. Verify that the rear wiper now works normally.
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