Inspection Procedure N-6: Column Switch: ETACS-Ecu Does Not Receive Any Signal From The Taillight Switch, The Headlight Switch, The Passing Light Switch, The Dimmer Switch, The Turn-Signal Light Switch Or Switch.: Diagnosis

NOTE:

For Special Tool identification, see SPECIAL TOOLS .

Required Special Tools:

MB991223: Harness Set
MB991958: Scan Tool (MUT-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: USB Cable
- MB991911: Main Harness B
MB991862: SWS monitor kit

STEP 1. Use scan tool MB991958 to select "ECU COMMCHK" on the SWS monitor display.
Check the column-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.
1. Connect scan tool MB991958 to the data link connector (16-pin).
2. Connect SWS monitor kit MB991862 to the data link connector (13-pin).
3. Turn the ignition switch to the "LOCK" (OFF) position.
4. Operate the scan tool MB991958 according to the procedure below to display "ECU COMM CHECK."
  1. Select "SYSTEM SELECT."
  2. Select "SWS."
  3. Select "SWS MONITOR."
  4. Select "ECU COMM CHK".
5. Scan tool MB991958 should show "OK" on the "ECU COMM CHK" menu for the "COLUMN ECU" menu.
Q: Is "OK" displayed on the "COLUMN ECU" menu?
1. YES : Go to Step 2.
2. NO : Refer to INSPECTION PROCEDURE A-2 "COMMUNICATION WITH COLUMN SWITCH (COLUMN-ECU) IS NOT POSSIBLE ."
Fig 1: Connecting Scan Tool MB991958 To Data Link Connector
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
STEP 2. Replace the ECU.
1. Replace the column switch (lighting and turn-signal light switch).
2. If the functions, which are described in "CIRCUIT OPERATION ", work normally, the input signal from the column switch (lighting and turn-signal light switch) should be normal.
Q: Does the column switch (lighting and turn-signal light switch) send normal signal to the ECU?
1. YES : No action is necessary and testing is complete.
2. NO : Replace the ETACS-ECU. If the functions, which are described in "CIRCUIT OPERATION ", work normally, the input signal from the column switch (lighting and turn-signal light switch) should be normal.