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Home >> Mitsubishi >> 2012 >> Lancer Evolution L4-2.0L Turbo (4B11T/C) >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> Manufacturer Code Charts >> DTC 22

DTC 22




DTC 22: Stoplight Switch System





















CIRCUIT OPERATION

- For the stoplight switch, two switches, a stoplight switch for the stoplight illumination and a brake switch exclusively for the cruise control system, are incorporated to improve the reliability.
- As for the stoplight switch, when the brake pedal is depressed/released, the stoplight switch ON/OFF signal is transmitted from the ETACS-ECU to the ECM via CAN bus line.
- As for the brake switch, the ECM connector B-10 terminal number 108 monitor the state of the brake switch. The brake switch turn ON/OFF when the brake pedal is depressed/released, and the input signal to the ECM connector B-10 terminal number 108 changes. According to this change, the ECM judges the state of the brake switch.

DTC SET CONDITIONS

Check Condition

- The "CRUISE" indicator light illuminates.
Judgment Criteria

- Open/short in stoplight switch circuit.
- Open circuit in the brake switch circuit (between ECM connector B-10 terminal number 108 and body ground.)
- Malfunction of CAN bus line.

TROUBLESHOOTING HINTS (THE MOST LIKELY CAUSES FOR THIS CASE:)

- Malfunction of CAN bus system.
- Damaged harness or connector.
- Malfunction of the stoplight switch.
- Malfunction of the ETACS-ECU
- Malfunction of the ECM

DIAGNOSTIC PROCEDURE

Required Special Tools:

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

CAUTION:
If there is any problem in the CAN bus lines, an incorrect diagnostic trouble code (DTC) may be set. Prior to this diagnosis, diagnose the CAN bus lines Initial Inspection and Diagnostic Overview.)

STEP 1. Using scan tool MB991958, diagnose the CAN bus line.





(1)
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 scan tool MB991958 to the data link connector (Refer to Reading and Clearing Diagnostic Trouble Codes.)
(2)Turn the ignition switch to the "ON" position.
(3)Diagnose the CAN bus line (Refer to Scan Tool Testing and Procedures.)

Q. Is the check result satisfactory?

YES Go to Step 2

NO Repair the CAN bus lines CAN Bus Diagnostics Chart.) Then go to Step 16.

STEP 2. Using scan tool MB991958, check data list item 74: Brake light switch.

(1)Connect scan tool MB991958 to the data link connector (Refer to Reading and Clearing Diagnostic Trouble Codes.)

(2)Turn the ignition switch to the "ON" position.

(3)Set scan tool MB991958 to data reading mode for cruise control system (Refer to Scan Tool Testing and Procedures.)

- Item 74: Brake light switch.
- When the brake pedal is depressed, the display on scan tool MB991958 should be "ON".
- When the brake pedal is released, the display on scan tool MB991958 should be "OFF".

Q. Is the switch operating properly?

YES Go to Step 10.
NO Go to Step 3.
STEP 3. Using scan tool MB991958, check ETACS system data list item 290: Brake light switch.

(1)Connect scan tool MB991958 to the data link connector (Refer to Reading and Clearing Diagnostic Trouble Codes.)

(2)Turn the ignition switch to the "ON" position.

(3)Set scan tool MB991958 to data reading mode for ETACS system Data List Reference Table.)

- Item 290: Brake light switch.
- When the brake pedal is depressed, the display on scan tool MB991958 should be "ON".
- When the brake pedal is released, the display on scan tool MB991958 should be "OFF".

Q. Is the switch operating properly?

YES Replace the ECM [ Removal and Replacement.] Then go to Step 16.
NO Go to Step 4.
STEP 4. Check stoplight switch connector C-48, and ETACS-ECU connector C-304 and C-312, for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Harness Connector Inspection.

Q. Is the connector and terminal in good condition?

YES Go to Step 5.
NO Repair or replace the damaged connector. Then go to Step 16.
STEP 5. Check the harness wire between ETACS-ECU connector C-304 terminal number 1 and stoplight switch connector C-48 terminal number 2, and between stoplight switch connector C-48 terminal number 1 and ETACS-ECU connector C-312 terminal number 16, for damage.

- Check harness wire for open/short circuit and damage.

Q. Is the harness wire in good condition?

YES Go to Step 6.
NO Repair or replace the damaged harness wire. Then go to Step 16.
STEP 6. Check fuse number 2 at the ETACS-ECU.





Q. Is the fuse in good condition?

YES Go to Step 7.

NO Check the stoplight system harness and replace the fuse. Then go to Step 16.

STEP 7. Check the stoplight switch.

Testing and Inspection.

Q. Is the stoplight switch operating properly?

YES Go to Step 8.
NO Replace the stoplight switch Service and Repair.) Then go to Step 16.
STEP 8. Using scan tool MB991958, check ETACS system data list item 290: Brake light switch.

(1)Connect scan tool MB991958 to the data link connector (Refer to Reading and Clearing Diagnostic Trouble Codes).

(2)Turn the ignition switch to the "ON" position.

(3)Set scan tool MB991958 to data reading mode for ETACS system Data List Reference Table.)

- Item 290: Brake light switch.
- When the brake pedal is depressed, the display on scan tool MB991958 should be "ON".
- When the brake pedal is released, the display on scan tool MB991958 should be "OFF".

Q. Is the switch operating properly?

YES Go to Step 9.
NO Replace the ETACS-ECU Electronic Time and Alarm Control System (ETACS)-ECU Removal and Installation.) Then go to Step 16.
STEP 9. Using scan tool MB991958, check data list item 74: Brake light switch.

(1)Connect scan tool MB991958 to the data link connector (Refer to Reading and Clearing Diagnostic Trouble Codes.)

(2)Turn the ignition switch to the "ON" position.

(3)Set scan tool MB991958 to data reading mode for cruise control system (Refer to Scan Tool Testing and Procedures.)

- Item 74: Brake light switch.
- When the brake pedal is depressed, the display on scan tool MB991958 should be "ON."
- When the brake pedal is released, the display on scan tool MB991958 should be "OFF."

Q. Is the switch operating properly?

YES Go to Step 10.
NO Replace the ECM [ Removal and Replacement.] Then go to Step 16.
STEP 10. Using scan tool MB991958, check data list item 89: Normally closed brake switch.

(1)Connect scan tool MB991958 to the data link connector (Refer to Reading and Clearing Diagnostic Trouble Codes).

(2)Turn the ignition switch to the "ON" position.

(3)Set scan tool MB991958 to data reading mode for cruise control system (Refer to Scan Tool Testing and Procedures.)

- Item 89: Normally closed brake switch.
- When the brake pedal is depressed, the display on scan tool MB991958 should be "ON".
- When the brake pedal is released, the display on scan tool MB991958 should be "OFF".

Q. Is the switch operating properly?

YES Go to Step 15.
NO Go to Step 11.
STEP 11. Check ECM connector B-10 and stoplight switch connector C-48, for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Harness Connector Inspection.

Q. Is the connector and terminal in good condition?

YES Go to Step 12.
NO Repair or replace the damaged connector. Then go to Step 16.
STEP 12. Check the harness wire between ECM connector B-10 terminal number 108 and stoplight switch connector C-48 terminal number 3, and between stoplight switch connector C-48 terminal number 4 and body ground, for damage.

- Check harness wire for open/short circuit and damage.





Q. Is the harness wire in good condition?

YES Go to Step 13.

NO Repair or replace the damaged harness wire. Then go to Step 16.

STEP 13. Check the stoplight switch.

Testing and Inspection.

Q. Is the stoplight switch operating properly?

YES Go to Step 14.
NO Replace the stoplight switch Service and Repair.) Then go to Step 16.
STEP 14. Using scan tool MB991958, check data list item 89: Normally closed brake switch.

(1)Connect scan tool MB991958 to the data link connector (Refer to Reading and Clearing Diagnostic Trouble Codes.)

(2)Turn the ignition switch to the "ON" position.

(3)Set scan tool MB991958 to data reading mode for cruise control system (Refer to Scan Tool Testing and Procedures.)

- Item 89: Normally closed brake switch.
- When the brake pedal is depressed, the display on scan tool MB991958 should be "ON."
- When the brake pedal is released, the display on scan tool MB991958 should be "OFF."

Q. Is the switch operating properly?

YES Go to Step 15.
NO Replace the ECM [ Removal and Replacement.] Then go to Step 16.
STEP 15. Read the cruise control system DTC.

(1)Disconnect the negative (-) battery terminal, to erase the DTC of the cruise control system.

(2)Connect the negative (-) battery cable.

(3)Turn the ignition switch to the "ON" position, and press the "ON/OFF" switch to turn the cruise control system to ON (turn on the "CRUISE" indicator light.)

(4)With the cruise control switches not operated, depress the brake pedal for several seconds, and then read the DTC of the cruise control system (Refer to Reading and Clearing Diagnostic Trouble Codes.)

Q. Is DTC 22 set?

YES Replace the ECM [ Removal and Replacement.] Then go to Step 16.
NO It can be assumed that this malfunction is intermittent How to Cope With Intermittent Malfunctions.)
STEP 16. Using scan tool MB991958, check data list item 74: Brake light switch and item 89: Normally closed brake switch.

(1)Connect scan tool MB991958 to the data link connector (Refer to Reading and Clearing Diagnostic Trouble Codes.)

(2)Turn the ignition switch to the "ON" position.

(3)Set scan tool MB991958 to data reading mode for cruise control system (Refer to Scan Tool Testing and Procedures.)

- Item 74: Brake light switch.
- When the brake pedal is depressed, the display on scan tool MB991958 should be "ON."
- When the brake pedal is released, the display on scan tool MB991958 should be "OFF."
- Item 89: Normally closed brake switch.
- When the brake pedal is depressed, the display on scan tool MB991958 should be "ON."
- When the brake pedal is released, the display on scan tool MB991958 should be "OFF."

Q. Is the switch operating properly?

YES Go to Step 17.
NO Return to Step 2.
STEP 17. Read the cruise control system DTC.

(1)Disconnect the negative (-) battery terminal, to erase the DTC of the cruise control system.

(2)Connect the negative (-) battery cable.

(3)Turn the ignition switch to the "ON" position, and press the "ON/OFF" switch to turn the cruise control system to ON (turn on the "CRUISE" indicator light.)

(4)With the cruise control switches not operated, depress the brake pedal for several seconds, and then read the DTC of the cruise control system (Refer to Reading and Clearing Diagnostic Trouble Codes.)

Q. Is DTC 22 set?

YES Return to Step 1.
NO The procedure is complete.
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