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Home >> Mitsubishi >> 2009 >> Galant L4-2.4L (4G69) >> Repair and Diagnosis >> Body and Frame >> Body Control Systems >> Testing and Inspection >> Symptom Related Diagnostic Procedures >> Symptom Diagnostic Procedures >> Inspection Procedure N-4

Inspection Procedure N-4

INSPECTION PROCEDURE N-4: ETACS-ECU does not receive any signal from the front door lock actuator.


Door Lock Actuator Input Circuit (Part 1):




Door Lock Actuator Input Circuit (Part 2):






CIRCUIT OPERATION
The ETACS-ECU operates the following functions or systems according to signal from the front door lock actuator:
- Central door locking system
- Ignition key reminder tone alarm
- Keyless entry system
- Dome light [front door lock actuator (LH)]

TECHNICAL DESCRIPTION (COMMENT)
If the signal is not normal, the functions or systems described in "CIRCUIT OPERATION" do not work normally.

TROUBLESHOOTING HINTS
- The front door lock actuator may be defective
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector
- 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
- MB991910: M.U.T.-III Main Harness A

STEP 1. Check the input signal (by using the pulse check mode of the monitor).

Check the input signals from the front door lock actuators.

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 the scan tool MB991958. Refer to "How to connect SWS monitor." How to Connect SWS Monitor
2. Operate scan tool MB991958 according to the procedure below to display "Pulse check."
a. Select "Interactive Diagnosis."
b. Select "System select."
c. Select "SWS."
d. Select "Pulse Checking."

3. Check that scan tool MB991958 sounds.

Q: When the front door lock actuators are operated, does the scan tool MB991958 sound?

When the front door lock actuator (LH) is operated, the scan tool MB991958 does not sound. : Go to Step 2.
When the front door lock actuator (RH) is operated, the scan tool MB991958 does not sound. : Go to Step 8.

STEP 2. Check front door lock actuator (LH) connector E-15 for loose, corroded or damaged terminals, or terminals pushed back in the connector.







Q: Is front door lock actuator (LH) connector E-15 in good condition?

YES : Go to Step 3.

NO : Repair or replace the damaged component(s). If the functions described in "CIRCUIT OPERATION" work normally, the input signal from the front door lock actuator (LH) should be normal.

STEP 3. Check the front door lock actuator (LH).







Disconnect front door lock actuator (LH) connector E-15. Then check continuity between the terminals.







Q: Is the front door lock actuator (LH) in good condition?

YES : Go to Step 4.

NO : Replace the front door lock actuator (LH). If the functions described in "CIRCUIT OPERATION" work normally, the input signal from the front door lock actuator (LH) should be normal.

STEP 4. Check the ground circuit to the front door lock actuator (LH). Measure the resistance at front door lock actuator (LH) connector E-15.







1. Disconnect front door lock actuator (LH) connector E-15 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 be 2 ohms or less.

Q: Is the measured resistance 2 ohms or less?

YES : Go to Step 6.

NO : Go to Step 5.

STEP 5. Check the wiring harness between front door lock actuator (LH) connector E-15 (terminal 1) and ground.

- Check the ground wire for open circuit.







NOTE: Also check intermediate connector C-26 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-26 is damaged, repair or replace the connector as described.

Q: Is the wiring harness between front door lock actuator (LH) connector E-15 (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. If the functions described in "CIRCUIT OPERATION" work normally, the input signal from the front door lock actuator (LH) should be normal.

STEP 6. Check ETACS-ECU connector C-217 for loose, corroded or damaged terminals, or terminals pushed back in the connector.







Q: Is ETACS-ECU connector C-217 in good condition?

YES : Go to Step 7.

NO : Repair or replace the damaged component(s). If the functions described in "CIRCUIT OPERATION" work normally, the input signal from the front door lock actuator (LH) should be normal.

STEP 7. Check the wiring harness between front door lock actuator (LH) connector E-15 (terminal 2) and ETACS-ECU connector C-217 (terminal 36).

- Check the communication lines for open circuit and short circuit.







NOTE: Also check intermediate connector C-26 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-26 is damaged, repair or replace the connector as described.

Q: Is the wiring harness between front door lock actuator (LH) connector E-15 (terminal 2) and ETACS-ECU connector C-217 (terminal 36) in good condition?

YES : Replace the ETACS-ECU. When the ETACS-ECU is replaced, register the encrypted code. If the functions described in "CIRCUIT OPERATION" work normally, the input signal from the front door lock actuator (LH) should be normal.

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. If the functions described in "CIRCUIT OPERATION" work normally, the input signal from the front door lock actuator (LH) should be normal.

STEP 8. Check front door lock actuator (RH) connector E-05 for loose, corroded or damaged terminals, or terminals pushed back in the connector.







Q: Is front door lock actuator (RH) connector E-05 in good condition?

YES : Go to Step 9.

NO : Repair or replace the damaged component(s). If the functions described in "CIRCUIT OPERATION" work normally, the input signal from the front door lock actuator (RH) should be normal.

STEP 9. Check the front door lock actuator (RH).







Disconnect front door lock actuator (RH) connector E-05. Then check continuity between the terminals.







Q: Is the front door lock actuator (RH) in good condition?

YES : Go to Step 10.

NO : Replace the front door lock actuator (RH). If the functions described in "CIRCUIT OPERATION" work normally, the input signal from the front door lock actuator (RH) should be normal.

STEP 10. Check the ground circuit to the front door lock actuator (RH). Measure the resistance at front door lock actuator (RH) connector E-05.







1. Disconnect front door lock actuator (RH) connector E-05 and measure the resistance available at the wiring harness side of the connector.







2. Measure the resistance value between terminal 3 and ground.
- The resistance should be 2 ohms or less.

Q: Is the measured resistance 2 ohms or less?

YES : Go to Step 12.

NO : Go to Step 11.

STEP 11. Check the wiring harness between front door lock actuator (RH) connector E-05 (terminal 3) and ground.

- Check the ground wire for open circuit.












NOTE: Also check intermediate connector C-12 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-12 is damaged, repair or replace the connector as described.

Q: Is the wiring harness between front door lock actuator (RH) connector E-05 (terminal 3) 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. If the functions described in "CIRCUIT OPERATION" work normally, the input signal from the front door lock actuator (RH) should be normal.

STEP 12. Check ETACS-ECU connector C-217 for loose, corroded or damaged terminals, or terminals pushed back in the connector.







Q: Is ETACS-ECU connector C-217 in good condition?

YES : Go to Step 13.

NO : Repair or replace the damaged component(s). If the functions described in "CIRCUIT OPERATION" work normally, the input signal from the front door lock actuator (RH) should be normal.

STEP 13. Check the wiring harness between front door lock actuator (RH) connector E-05 (terminal 2) and ETACS-ECU connector C-217 (terminal 43).

- Check the communication lines for open circuit and short circuit.







NOTE: Also check intermediate connector C-12 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-12 is damaged, repair or replace the connector as described.

Q: Is the wiring harness between front door lock actuator (RH) connector E-05 (terminal 2) and ETACS-ECU connector C-217 (terminal 43) in good condition?

YES : Replace the ETACS-ECU. When the ETACS-ECU is replaced, register the encrypted code. If the functions described in "CIRCUIT OPERATION" work normally, the input signal from the front door lock actuator (RH) should be normal.

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. If the functions described in "CIRCUIT OPERATION" work normally, the input signal from the front door lock actuator (RH) should be normal.
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