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Home >> Mitsubishi >> 2009 >> Lancer L4-2.0L (4B11) >> 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

Stoplight Switch System Circuit (Part 1):




Stoplight Switch System Circuit (Part 2):






CIRCUIT OPERATION
- As for the stoplight switch, when the brake pedal is depressed, the stoplight switch ON signal is transmitted from the ETACS-ECU to the ECM via CAN bus line.
- As for the brake switch, when the brake pedal is depressed, battery positive voltage is supplied to the stoplight switch (terminal number 3), and when the brake pedal is not depressed, the voltage of ECM (terminal number 108) will indicate 0 volt.

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 terminal number 108 and 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

DIAGNOSIS

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 may be set. Prior to this diagnosis, diagnose the CAN bus lines. (Refer to Trouble code diagnosis) Diagnostic Trouble Code Descriptions

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






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. Scan Tool Connecting
2. Turn the ignition switch to the "ON" position.
3. Diagnose the CAN bus line. How to Diagnose the CAN Bus Line
4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.

Q: Is the check result satisfactory?

YES : Go to Step 2.

NO : Repair the CAN bus lines. Then go to Step 15.

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

1. Connect scan tool MB991958 to the data link connector. Scan Tool Connecting
2. Turn the ignition switch to the "ON" position.
3. Set scan tool MB991958 to data reading mode for cruise control system. Reading Diagnostic Trouble Codes
- 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."

4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.

Q: Is the switch operating properly?

YES : Go to Step 9.

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. Scan Tool Connecting
2. Turn the ignition switch to the "ON" position.
3. Set scan tool MB991958 to data reading mode for ETACS system. (Refer to Troubleshooting -Data List Reference Table 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."

4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.

Q: Is the switch operating properly?

YES : Replace the ECM. Then go to Step 15.

NO : Go to Step 4.

STEP 4. Check stoplight switch connector C-32 and ETACS-ECU connector C-304 and C-312 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Refer to Harness Connector Inspection. Connector Continuity and Voltage Test

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 15.

STEP 5. Check the harness wire between ETACS-ECU connector C-304 terminal number 1 and stoplight switch connector C-32 terminal number 2, and check the harness wire between stoplight switch connector C-32 terminal number 1 and ETACS-ECU connector C-312 terminal number 16, for damage.

Q: Is the harness wire in good condition?

YES : Go to Step 6.

NO : Repair the damaged harness wire. Then go to Step 15.

STEP 6. Check the stoplight switch.

1. Remove the stoplight switch.




2. Connect an ohmmeter to the stoplight switch between terminals number 1 and number 2.
3. Check for continuity between the terminals when the plunger of the stoplight switch is pushed in and when it is released.
4. The stoplight switch is operating properly if the circuit is open between terminals number 1 and number 2 when the plunger is pushed in to a depth of within 4.0 mm (0.16 inch) from the outer case edge surface, and if the resistance value is less than 2 ohms between terminals number 1 and number 2 when it is released.

Q: Is the stoplight switch operating properly?

YES : Install the stoplight switch. Then go to Step 7.

NO : Replace the stoplight switch. Then go to Step 15.

STEP 7. Check fuse number 2 at the ETACS-ECU.






Q: Is the fuse in good condition?

YES : Go to Step 8.

NO : Check the stoplight system harness and replace the fuse. Then go to Step 15.

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. Scan Tool Connecting
2. Turn the ignition switch to the "ON" position.
3. Set scan tool MB991958 to data reading mode for ETACS system. (Refer to Troubleshooting -Data List Reference Table 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."

4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.

Q: Is the switch operating properly?

YES : Go to Step 9.

NO : Replace the ETACS-ECU. Then go to Step 15.

STEP 9. Using scan tool MB991958, check data list item 89: Normally closed brake switch.

1. Connect scan tool MB991958 to the data link connector. Scan Tool Connecting
2. Turn the ignition switch to the "ON" position.
3. Set scan tool MB991958 to data reading mode for cruise control system. Reading Diagnostic Trouble Codes
- 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."

4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.

Q: Is the switch operating properly?

YES : Go to Step 14.

NO : Go to Step 10.

STEP 10. Check ECM connector B-109 and stoplight switch connector C-32 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Refer to Harness Connector Inspection. Connector Continuity and Voltage Test

Q: Is the connector and terminal in good condition?

YES : Go to Step 11.

NO : Repair or replace the damaged connector. Then go to Step 15.

STEP 11. Check the harness wire between ECM connector B-109 terminal number 108 and stoplight switch connector C-32 terminal number 3, and check the harness wire between stoplight switch connector C-32 terminal number 4 and ground, for damage.






Q: Is the harness wire in good condition?

YES : Go to Step 12.

NO : Repair the damaged harness wire. Then go to Step 15.

STEP 12. Check the stoplight switch.

1. Remove the stoplight switch.




2. Connect an ohmmeter to the stoplight switch between terminals number 3 and number 4.
3. Check for continuity between the terminals when the plunger of the stoplight switch is pushed in and when it is released.
4. The stoplight switch is operating properly if the circuit is open between terminals number 3 and number 4 when the plunger is released, and if resistance value is less than 2 ohms between terminals number 3 and number 4 when the plunger is pushed in to a depth of within 4.5 mm (0.18 inch) from the outer case edge surface.

Q: Is the stoplight switch operating properly?

YES : Install the stoplight switch. Then go to Step 13.

NO : Replace the stoplight switch. Then go to Step 15.

STEP 13. Using scan tool MB991958, check data list item 89: Normally closed brake switch.

1. Connect scan tool MB991958 to the data link connector. Scan Tool Connecting
2. Turn the ignition switch to the "ON" position.
3. Set scan tool MB991958 to data reading mode for cruise control system. Reading Diagnostic Trouble Codes
- 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."

4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.

Q: Is the switch operating properly?

YES : Go to Step 14

NO : Replace the ECM. When the ECM is replaced, register the encrypted code. Then go to Step 15.

STEP 14. 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.

Q: Is DTC 22 set?

YES : Replace the ECM. When the ECM is replaced, register the encrypted code. Then go to Step 15.

NO : It can be assumed that this malfunction is intermittent.

STEP 15. 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. Scan Tool Connecting
2. Turn the ignition switch to the "ON" position.
3. Set scan tool MB991958 to data reading mode for cruise control system. Reading Diagnostic Trouble Codes
- 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."

4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.

Q: Is the switch operating properly?

YES : Go to Step 16

NO : Return to Step 2.

STEP 16. 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.

Q: Is DTC 22 set?

YES : Return to Step 1.

NO : The procedure is complete.
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