Subaru IMPREZA 2004 Service Manual page 785

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
N: DTC 46 CO RESISTOR (GENERAL SPEC. VEHICLES)
• DIAGNOSIS:
• The CO resistor signal is abnormal.
• The harness connector between ECM and CO resistor is open or shorted.
• The CO value is not adjusted to specifications.
• TROUBLE SYMPTOM:
• Erroneous idling
• Mixture ratio is too rich or too lean.
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory and inspection modes. <Ref. to
EN(H4SOw/oOBD)(diag)-28, OPERATION, Clear Memory Mode.> and <Ref. to EN(H4SOw/oOBD)(di-
ag)-26, OPERATION, Inspection Mode.>
• WIRING DIAGRAM:
CO RESISTOR
B28
1
2
B83
B136 ECM
EN(H4SOw/oOBD)(diag)-89
1 LHD : 8
RHD : 1
2 LHD : 3
RHD : 2
ENGINE (DIAGNOSTICS)
B28
1 2 3
LHD: B83
1 2 3 4
5 6 7 8
RHD: B83
1 2 3 4 5 6
B136
1 2 3 4 5 6 7
8 9 10 11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30
EN-02586