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Home >> Mitsubishi >> 2006 >> Lancer Evolution L4-2.0L DOHC Turbo >> Repair and Diagnosis >> Restraints and Safety Systems >> Air Bag Systems >> Testing and Inspection >> Initial Inspection and Diagnostic Overview >> Post-Collision Diagnosis & Repair

Post-Collision Diagnosis & Repair

POST-COLLISION DIAGNOSIS

To inspect and service the SRS after a collision (whether or not the air bags have deployed), perform the following steps.

SRS-ECU MEMORY CHECK

Required Special Tools:
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: M.U.T.-III USB Cable
- MB991911: M.U.T.-III Main Harness B

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).

NOTE: If the battery power supply has been disconnected or disrupted by the collision, scan tool MB991958 cannot communicate with the SRS-ECU. Check the battery then check and, if necessary, repair the front wiring harness and the instrument panel wiring harness before proceeding.

2. Read (and write down) all displayed DTC.
3. Read the data list (fault duration and how many times memories are erased) using scan tool MB991958.

Data List:




4. Erase DTC's and after waiting 5 seconds or more read (and write down) all displayed DTC's.

REPAIR PROCEDURE

WHEN FRONT AIR BAGS DEPLOY IN A COLLISION.
1. Replace the following parts with new ones.
- Front impact sensor.
- SRS-ECU.
- Air bag module.
- Seat belt with pre-tensioner.
- Instrument panel.

2. Check the following parts and replace if there are any malfunctions.
- Clock spring.
- Steering wheel, steering column and shaft assembly

1. Check the wiring harness (built into the steering wheel) and connectors for damage, and terminals for deformation.
2. Install the air bag module to check fit or alignment with the steering wheel.
3. Check the steering wheel for noise, binding or difficult operation and excessive free play.
4. Check the steering column shaft shock absorbing mechanism (Refer to On-Vehicle Service - Steering Column Shaft Assembly Shock Absorbing Mechanism Check).

3. Check the wiring harnesses for binding, the connectors for damage, poor connections, and the terminals for deformation.

WHEN AIR BAGS DO NOT DEPLOY IN LOW-SPEED COLLISION.
Check the SRS components. If the SRS components are showing any visible damage such as dents, cracks, or deformation, replace them with new ones. Concerning parts removed for Inspection, replacement with new parts and cautionary points for working, refer to appropriate INDIVIDUAL COMPONENT SERVICE.

FRONT IMPACT SENSOR




1. Check the radiator support panel for distortion and rust.
2. Check the front impact sensor for dents, cracks, deformation or rust.
3. Check the front impact sensor wiring harness for binding, check the connector for damage, and check the terminals for deformation.

SRS-ECU




1. Check the SRS-ECU case and brackets for dents, cracks or deformation.
2. Check the connector for damage, and the terminals for deformation.
3. Check the fit of the SRS-ECU and its bracket.

AIR BAG MODULES




1. Check the pad cover for dents, cracks or deformation.
2. Check the connector for damage, terminals deformities, and the harness for binding.
3. Check the air bag inflator case for dents, cracks or deformities.
4. Install the air bag module (driver's side) to the steering wheel to check fit or alignment with the steering wheel.
5. Install the air bag module (front passenger's side) to the instrument panel and front deck crossmember to check fit or alignment.

CLOCK SPRING




1. Check the clock spring connectors and protective tube for damage, and the terminals for deformation.
2. Visually check the case for damage.

STEERING WHEEL, STEERING COLUMN AND SHAFT ASSEMBLY
1. Check the wiring harness (built into the steering wheel) and the connectors for damage, and the terminals for deformation.
2. Install the air bag module to check fit or alignment with the steering wheel.
3. Check the steering wheel for noise, binding or difficult operation and excessive free play.
4. Check the steering column shaft shock absorbing mechanism (Refer to On-Vehicle Service -Steering Column Shaft Assembly Shock Absorbing Mechanism Check).

SEAT BELT WITH PRE-TENSIONER
1. Check the seat belt for damage or deformation.
2. Check the seat belt with pre-tensioner for cracks or deformation.
3. Check that the unit is installed correctly to the vehicle body.

HARNESS CONNECTOR (FLOOR WIRING HARNESS)
Check the harnesses for binding, the connectors for damage, poor connection, and the terminals for deformation.
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