FREE REPAIR MANUALS & LABOR GUIDES 1982-2013 Vehicles
Courtesy of Operation CHARM: Car repair manuals for everyone.
Home >> Mitsubishi >> 2008 >> 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

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 DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines.
- Whenever the ECM is replaced, ensure that the CAN bus lines are normal.

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 (Refer to Controller Area Network, Diagnosis - Can Bus Diagnostic 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 Engine and Emission Control. 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 Engine and Emission Control. 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 Chassis Electrical, ETACS-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 [Refer to MFI, Engine Control Module (ECM)]. When the ECM is replaced, register the encrypted code (Refer to Wireless Control Module, Diagnosis-ID Code Registration Judgment Table). 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.

Refer to General (Electrical), Harness Connector Inspection.

Q: Is the connectors and terminals in good condition?

YES : Go to Step 5.

NO : Repair or replace the faulty 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, between stoplight switch connector C-48 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 16.

STEP 6. Check the stoplight switch.

1. Remove the stoplight switch (Refer to Basic Brake System, Brake Pedal).




2. Connect an ohmmeter to the stoplight switch between terminals number 1 and 2.
3. Check for continuity between the terminal 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 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 2 when it is released.






Q: Is the stoplight switch operating properly?

YES : Install the stoplight switch (Refer to Basic Brake System, Brake Pedal). Then go to Step 7.

NO : Replace the stoplight switch (Refer to Basic Brake System, Brake Pedal). Then go to Step 16.

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






Q: Is the fuse in good condition?

YES : Go to Step 8.

NO : Replace the fuse. 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. 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 Chassis Electrical, ETACS-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 (Refer to Chassis Electrical, ETACS-ECU). Then go to Step 16.

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 15.

NO : Go to Step 10.

STEP 10. Check ECM connector B-10 and stoplight switch connector C-48 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Refer to General (electrical), Harness Connector Inspection.

Q: Are the connectors and terminals in good condition?

YES : Go to Step 11.

NO : Repair or replace the faulty connector. Then go to Step 16.

STEP 11. Check the harness wire between ECM connector B-10 terminal number 108 and stoplight switch connector C-48 terminal number 3, between stoplight switch connector C-48 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 16.

STEP 12. Check the stoplight switch.

1. Remove the stoplight switch (Refer to Basic Brake System, Brake Pedal).




2. Connect an ohmmeter to the stoplight switch between terminals number 3 and 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 4 when the plunger is released, and if resistance value is less than 2 ohms between terminals number 3 and 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 (Refer to Basic Brake System, Brake Pedal). Then go to Step 13.

NO : Replace the stoplight switch (Refer to Basic Brake System, Brake Pedal). Then go to Step 16.

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 [Refer to MFI, Engine Control Module (ECM)]. When the ECM is replaced, register the encrypted code (Refer to Wireless Control Module, Diagnosis-ID Code Registration Judgment Table). Then go to Step 16.

STEP 14. 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 : It can be assumed that this malfunction is intermittent (Refer to General (Body and Chassis), How to Use Troubleshooting/Inspection Service Points-How to Cope with Intermittent Malfunction).

NO : Return to Step 2.

STEP 15. Read the 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 Engine and Emission Control).

Q: Is DTC 22 set?

YES : Replace the ECM [Refer to MFI, Engine Control Module (ECM)]. When the ECM is replaced, register the encrypted code (Refer to Wireless Control Module, Diagnosis-ID Code Registration Judgment Table). Then go to Step 16.

NO : It can be assumed that this malfunction is intermittent (Refer to General (Body and Chassis), How to Use Troubleshooting/Inspection Service Points-How to Cope with Intermittent Malfunction).

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. 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 17

NO : Return to Step 2.

STEP 17. Read the 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.
pro multis Credits:Operation CHARM About Operation CHARM