Subaru 2002 IMPREZA Service Manual page 528

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
C: DTC P0037 — REAR OXYGEN SENSOR HEATER CIRCUIT MALFUNCTION
—
• DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN-49, OPERATION,
Clear Memory Mode.> and Inspection Mode <Ref. to EN-42, OPERATION, Inspection Mode.> .
• WIRING DIAGRAM:
MAIN RELAY
6
4
5
3
2
1
B47
5
1
B122
Step
1 CHECK GROUND CIRCUIT OF ECM.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from ECM.
3)Measure the resistance of harness between
ECM connector and chassis ground.
Connector & terminal
(B134) No. 35 — Chassis ground:
LHD 2 LHD
B61 F44
REAR OXYGEN
SENSOR
B19
LHD RHD
LHD RHD
B83
A: B134
ECM
C: B136
B22
E3
Is the resistance less than 5
Ω?
EN-96
BATTERY
4
1
Check
B47
1 2
3 4
5 6
B83
1 2 3 4
B122
1 2 3
4 5 6
F44
1 2 3 4
5 6 7 8
B22
1 2 3 4
5 6 7 8
9 10 11 12
13 14 15 16
C: B136
1 2 3 4
8 9 10 11 12 13 14 15 16 17 18
21 22 23 24 25 26 27
A: B134
1 2 3 4
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
24 25 26 27 28 29 30 31 32 33
Yes
Go to step 3. Go to step 2.
B19
1 2
3 4
(LHD)
2 1
4 3
(RHD)
5 6 7
19 20
28 29 30
5 6 7 8
34 35
EN1401
No