Subaru Legacy III (2000-2003 year). Service manual — part 157
EN(H4SO)-240
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 at the lower
portion of instrument panel (on the driver's
side).
3) Turn ignition switch to ON.
4) While operating radiator fan relay, measure
voltage between ECM terminal and ground.
Does the measured value change within
specified range?
NOTE:
Radiator fan relay operation can be executed
using Subaru Select Monitor. For procedure,
refer to “Compulsory Valve Operation Check
Mode”.<Ref. to EN(H4SO)-32, Subaru Select
Monitor.>
Connector & terminal
(B134) No. 14 (+) — Chassis ground (
−−−−
):
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 relay from A/C relay
holder.
3) Measure resistance of harness between
ECM connector and chassis ground.
Connector & terminal
(B134) No. 14 — 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 (
−−−−
):
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 RELAY.
1) Turn ignition switch to OFF.
2) Measure resistance between main fan relay
terminals.
Terminal
No. 5 — No. 7:
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
(B134) No. 14 — (F66) No. 7:
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(H4SO)-241
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(H4SO)-242
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
BE: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(H4SO)-47, OPER-
ATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO)-40, OPERATION, Inspection
Mode.> .
EN(H4SO)-243
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
• WIRING DIAGRAM:
EN-00736
2
1
4
3
21
22
24
20
8
7
5
9
20A
20A
SUB FAN
RELAY
AIR CONDITIONING RELAY HOLDER
SUB FAN
MOTOR
MAIN FAN
MOTOR
MAIN FAN
RELAY
F28
F16
F66
F27
1
2
F17
B100
F2
B72
1
2
K9
J10
NO. 3
NO. 18
NO. 17
SBF-4
SBF-1
IGNITION
SWITCH
B72
(BLUE)
3 4
1 2
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
B134
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 31 32 33
34 35
F28
F66
F27
BATTERY
14
13
B134
ECM
F2
1
2 3 4
5 6 7
9 10 11 12 13 14 15 16
8
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