Subaru Legacy 2004 Service Manual page 3166

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AQ:DTC C0057 EGI COMMUNICATION
DTC DETECTING CONDITION:
No CAN signal from ECM.
TROUBLE SYMPTOM:
• ABS does not operate.
• VDC does not operate.
Step
1 CHECK LAN SYSTEM.
Perform the diagnosis for LAN system. <Ref. to
LAN(diag)-24, OPERATION, Read Diagnostic
Trouble Code (DTC).>
2 CHECK POOR CONTACT IN CONNECTORS. Is the poor contact in ECM
3 CHECK ECM.
4 CHECK VDCCM&H/U.
1) Connect all the connectors.
2) Erase the memory.
3) Perform the inspection mode.
4) Read the DTC.
5 CHECK OTHER DTC DETECTION.
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Check
Is there any fault in LAN sys-
tem?
connector?
Is ECM normal?
Is the same DTC displayed?
Is any other DTC displayed?
VDC(diag)-93
Yes
Perform the diag- Go to step 2.
nosis according to
DTC for LAN sys-
tem.
Repair the con- Go to step 3.
nector.
Go to step 4. Replace the ECM.
Replace the It results from a
VDCCM&H/U. temporary noise
<Ref. to VDC-7, interference.
VDC Control Mod-
ule & Hydraulic
Control Unit
(VDCCM&H/U).>
Perform the diag- Temporary poor
nosis according to contact occurs.
DTC.
No