FREE REPAIR MANUALS & LABOR GUIDES 1982-2013 Vehicles
Courtesy of Operation CHARM: Car repair manuals for everyone.
Home >> Mitsubishi >> 2010 >> Lancer Evolution L4-2.0L Turbo (4B11T/C) >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Information Bus >> Testing and Inspection >> Component Tests and General Diagnostics >> CAN Bus Diagnostics >> Diagnostic Item 17

Diagnostic Item 17

DIAGNOSTIC ITEM 17: Diagnose When The Scan Tool Cannot Receive The Data Sent By SRS-ECU.

CAUTION: When servicing a CAN bus line, ground yourself by touching a metal object such as an unpainted water pipe. If you fail to do so, a component connected to the CAN bus line may be damaged.


CAN-B Communication Circuit (Part 1):




CAN-B Communication Circuit (Part 2):






FUNCTION
If the scan tool MB991958 cannot communicate with the SRS-ECU, this diagnosis result will be set.

TROUBLE JUDGMENT CONDITIONS
If a communication flag is not set for the SRS-ECU, the ETACS-ECU determines that there is a failure.

TROUBLESHOOTING HINTS
- Malfunction of the connector [joint connector (CAN1), SRS-ECU connector improperly connected]
- Malfunction of the wiring harness [open circuit between the SRS-ECU connector and the joint connector (CAN1), power supply circuit to the SRS-ECU]
- Malfunction of the SRS-ECU

DIAGNOSIS

Required Special Tools:
- MB991223: Harness Set
- MB992006: Extra Fine Probe

STEP 1. Check joint connector (CAN1) C-105 and SRS-ECU connector C-37 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

CAUTION: The strand end of the twisted wire should be within 10 cm (4 inches) from the connector.

Q: Are joint connector (CAN1) C-105 and SRS-ECU connector C-37 in good condition?

YES : Go to Step 2.

NO : Repair the damaged parts.

STEP 2. Check the wiring harness between joint connector (CAN1) C-105 and SRS-ECU connector C-37 for open circuit.

CAUTION: Strictly observe the specified wiring harness repair procedure.

1. Disconnect joint connector (CAN1) C-105 and SRS-ECU connector C-37, and check the wiring harness.







2. Check the wiring harness between joint connector (CAN1) C-105 (terminal 8) and SRS-ECU connector C-37 (terminal 15)

OK: Continuity exists (2 ohms or less)







3. Check the wiring harness between joint connector (CAN1) C-105 (terminal 21) and SRS-ECU connector C-37 (terminal 16)

OK: Continuity exists (2 ohms or less)

Q: Is the wiring harness between joint connector (CAN1) C-105 and SRS-ECU connector C-37 in good condition?

YES : Check the power supply circuit of the SRS-ECU. Refer to SRS - Troubleshooting. Symptom Related Diagnostic Procedures

NO : Repair the wiring harness between joint connector (CAN1) C-105 and SRS-ECU connector C-37.
pro multis Credits:Operation CHARM About Operation CHARM