Subaru 2009 IMPREZA Service Manual page 2538

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
AL:DTC C0057 ECM COMMUNICATION CIRCUIT
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)-31, OPERATION, Read Diagnostic
Trouble Code (DTC).>
2 CHECK POOR CONTACT OF CONNEC-
TORS.
3 CHECK ECM.
4 CHECK VDCCM&H/U.
1) Connect all connectors.
2) Clear the memory. <Ref. to VDC(diag)-24,
Clear Memory Mode.>
3) Perform the Inspection Mode. <Ref. to
VDC(diag)-23, Inspection Mode.>
4) Read the DTC.
5 CHECK OTHER DTC DETECTION.
Check
Is there any fault in LAN sys-
tem?
Is there poor contact of ECM
connector?
Is ECM normal?
Is the same DTC displayed?
Is any other DTC displayed?
VDC(diag)-76
Yes No
Perform the diag- Go to step 2.
nosis according to
DTC for LAN sys-
tem.
Repair the connec- Go to step 3.
tor.
Go to step 4. Replace the ECM.
Replace the Go to step 5.
VDCCM only.
<Ref. to VDC-9,
REPLACEMENT,
VDC Control Mod-
ule and Hydraulic
Control Unit
(VDCCM&H/U).>
Perform the diag- It results from a
nosis according to temporary noise
DTC. <Ref. to interference.
VDC(diag)-33, List
of Diagnostic Trou-
ble Code (DTC).>