Subaru Legacy III (2000-2003 year). Service manual — part 370
EN(H6DO)-282
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
Value
Yes
No
1
CHECK OUTPUT SIGNAL FROM ECM.
1) Turn ignition switch to OFF.
2) Connect test mode connector.
3) Turn ignition switch to ON.
4) While operating radiator fan relay, measure
voltage between ECM terminal and ground.
NOTE:
Radiator fan relay operation can be executed
using Subaru Select Monitor. For procedure,
refer to “Compulsory Valve Operation Check
Mode”.<Ref. to EN(H6DO)-34, Subaru Select
Monitor.>
Connector & terminal
(B137) No. 28 (+) — Chassis ground (
−−−−
):
(B137) No. 17 (+) — Chassis ground (
−−−−
):
Does the measured value change within
the specified range?
0 — 10 V
Repair poor con-
tact in ECM con-
nector.
2
CHECK GROUND SHORT CIRCUIT IN RADI-
ATOR FAN RELAY 1 CONTROL CIRCUIT.
1) Turn ignition switch to OFF.
2) Disconnect connectors from ECM and
remove main fan relays from A/C relay
holder.
3) Measure resistance of harness between
ECM connector and chassis ground.
Connector & terminal
(B137) No. 28 — Chassis ground:
(B137) No. 17 — Chassis ground:
Does the measured value exceed the spec-
ified value?
1 M
Ω
Repair ground
short circuit in radi-
ator fan relay 1
control circuit.
3
CHECK POWER SUPPLY FOR RELAY.
1) Turn ignition switch to ON.
2) Measure voltage between fuse and relay
box (F/B) connector and chassis ground.
Connector & terminal
(F66) No. 5 (+) — Chassis ground (
−−−−
):
(F30) No. 24 (+) — Chassis ground (
−−−−
):
Does the measured value exceed the spec-
ified value?
10 V
Repair open circuit
in harness
between ignition
switch and fuse
and relay box (F/
B) connector.
4
CHECK MAIN FAN RELAYS.
1) Turn ignition switch to OFF.
2) Measure resistance between main fan relay
terminals.
Terminal
(F66) No. 5 — No. 7:
(F30) No. 22 — No. 24:
Is the measured value within the specified
range?
87 — 107
Ω
Replace main fan
relay.
5
CHECK OPEN CIRCUIT IN MAIN FAN RE-
LAY CONTROL CIRCUIT.
Measure resistance of harness between ECM
and main fan relay connector.
Connector & terminal
(B137) No. 28 — (F66) No. 7:
(B137) No. 17 — (F30) No. 22:
Is the measured value less than the specified
value?
1
Ω
Repair harness
and connector.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
ECM and main fan
relay connector
• Poor contact in
coupling connector
EN(H6DO)-283
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
6
CHECK POOR CONTACT.
Check poor contact in ECM or main fan relay
connector.
Is there poor contact in ECM or main fan relay
connector?
There is poor contact.
Repair poor con-
tact in ECM or
main fan relay
connector.
Contact SUBARU
distributor service.
Step
Value
Yes
No
EN(H6DO)-284
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
BU:DTC P0692 — COOLING FAN 1 CONTROL CIRCUIT HIGH —
• DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
• TROUBLE SYMPTOM:
• Radiator fan does not operate properly.
• Overheating
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H6DO)-54, OP-
ERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H6DO)-47, OPERATION, Inspec-
tion Mode.>.
EN(H6DO)-285
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
• WIRING DIAGRAM:
CO-00167
2
1
4
3
28
27
25
29
8
7
5
9
31
32
34
30
21
22
24
20
30A
30A
SUB FAN
RELAY-1
AIR CONDITIONING RELAY HOLDER
SUB FAN
MOTOR
MAIN FAN
MOTOR
MAIN FAN
RELAY-1
F28
F16
F66
SUB FAN
RELAY-2
MAIN FAN
RELAY-2
F29
F30
F27
F17
B100
F2
B72
NO. 18
NO. 17
SBF-4
SBF-1
IGNITION
SWITCH
RELAY HOLDER (BLACK)
B72
F16
B253
F17
F46
3 4
1 2
B137
BATTERY
17
24
28
B137
ENG
IN
E C
O
NTR
O
L
M
O
DULE
B253
FAN RELAY
5
1
3
4
3
3
4
4
1
1
2
2
1
2
7
8
9
5
6
3
4
10 11 12
19 20 21
29 30 31
13 14 15 16 17
27 28
18
22 23 24 25 26
3 4
1 2
1
3
4
5
2
1
F46
B108
1
F44
B61
LHD
LHD
RHD
RHD
1
*
2
*
1
*
2
*
LHD : 7
LHD : 6
RHD : 5
RHD : 6
1 2 3 4
5 6 7 8
F44
F2
3 4
1 2
8 9 10 11
12 13 14 15 16 17 18 19 20 21 22 23 24
5 6
7
1
2
5 6
8
9
7
3
4
25 26 27
28
29
30
31
32 33 34
10
11
12 13 14
15 16 17
18
19
20
21
22 23 24
35
36
F30
F28
F29
F66
F27
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