Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 268
EN(H4DOTC)(diag)-296
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK FOR ANY OTHER DTC ON DISPLAY. Is any other DTC displayed?
2
CHECK HARNESS BETWEEN ECM AND
STARTER RELAY CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM and
starter motor.
3) Remove the starter relay.
4) Measure the resistance of harness between
ECM connector and starter relay connector.
Connector & terminal
(B136) No. 16 — (B225) No. 10:
Is the resistance less than 1 Ω? Go to step
Repair the open
circuit of harness
between ECM con-
nector and starter
relay connector.
3
CHECK HARNESS BETWEEN ECM AND
STARTER RELAY CONNECTOR.
Measure the resistance between ECM connec-
tor and chassis ground.
Connector & terminal
(B136) No. 16 — Chassis ground:
Is the resistance 1 MΩ or
more?
Repair the poor
contact of ECM
connector.
Repair the short
circuit to ground in
harness between
ECM connector
and starter relay
connector.
EN(H4DOTC)(diag)-297
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
DG:DTC P0617 STARTER RELAY CIRCUIT HIGH
DTC DETECTING CONDITION:
• Detected when 2 consecutive driving cycles with fault occur.
• GENERAL DESCRIPTION <Ref. to GD(H4DOTC)-200, DTC P0617 STARTER RELAY CIRCUIT HIGH,
Diagnostic Trouble Code (DTC) Detecting Criteria.>
TROUBLE SYMPTOM:
Failure of engine to start
CAUTION:
After servicing or replacing faulty parts, perform Clear Memory Mode <Ref. to EN(H4DOTC)(diag)-63,
OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H4DOTC)(diag)-49, PROCE-
WIRING DIAGRAM:
• Engine electrical system, without SI-DRIVE <Ref. to WI-32, WITHOUT SI-DRIVE, WIRING DIAGRAM,
• Engine electrical system, with SI-DRIVE <Ref. to WI-48, WITH SI-DRIVE, WIRING DIAGRAM, Engine
ECM
13
14
15 16
17
27
24
25
26
20
21
22
23
29
30
31
28
32 35
33
34
37
38
39
36
40
8
9
10
11 12
1
2
5
3
4
7
6
19
18
B225
1
2
B106
B106
1
2
5
6
7
2
1
3
4
29
10 11 12 13 14 15
25
24
16
30
9
8
17 18 19
20
28
21 22 23
32
31
26 27
33
34 35
EN-09249
16
10 11 12 13 14 15
25
24
30
9
8
7
17 18 19 20
28
21 22 23
29
32
31
1
2
3
4
5
6
27
26
33 34 35
B72
1
3
4 5 6
2
6
2
3
B14
B72
C: B136
C: B136
B: B135
B: B135
0
1
2
1
9
1
1
B225
C16
B26
SBF-6
E
M
F/B No. 21
MAIN SBF
BATTERY
IGNITION
SWITCH
STARTER
RELAY
STARTER MOTOR
CLUTCH
START
SWITCH
EN(H4DOTC)(diag)-298
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
DH:DTC P062F INTERNAL CONTROL MODULE EEPROM ERROR
NOTE:
For the diagnostic procedure, refer to DTC P0606. <Ref. to EN(H4DOTC)(diag)-293, DTC P0606 CONTROL
MODULE PROCESSOR, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
Step
Check
Yes
No
1
CHECK FOR ANY OTHER DTC ON DISPLAY. Is any other DTC displayed?
2
CHECK HARNESS BETWEEN ECM AND IG-
NITION SWITCH CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM.
3) Turn the ignition switch to ON.
4) Measure the voltage between ECM connec-
tor and chassis ground.
Connector & terminal
(B136) No. 16 (+) — Chassis ground (–):
Is the voltage 10 V or more?
Repair the short
circuit to power
supply in harness
between ECM con-
nector and ignition
switch connector.
Repair the poor
contact of ECM
connector.
EN(H4DOTC)(diag)-299
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
DI: DTC P0851 NEUTRAL SWITCH INPUT CIRCUIT LOW (MT MODEL)
DTC DETECTING CONDITION:
• Detected when 2 consecutive driving cycles with fault occur.
• GENERAL DESCRIPTION <Ref. to GD(H4DOTC)-203, DTC P0851 NEUTRAL SWITCH INPUT CIRCUIT
LOW (MT MODEL), Diagnostic Trouble Code (DTC) Detecting Criteria.>
TROUBLE SYMPTOM:
Improper idling
CAUTION:
After servicing or replacing faulty parts, perform Clear Memory Mode <Ref. to EN(H4DOTC)(diag)-63,
OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H4DOTC)(diag)-49, PROCE-
WIRING DIAGRAM:
• Engine electrical system, without SI-DRIVE <Ref. to WI-32, WITHOUT SI-DRIVE, WIRING DIAGRAM,
• Engine electrical system, with SI-DRIVE <Ref. to WI-48, WITH SI-DRIVE, WIRING DIAGRAM, Engine
EN-08739
35
B128
B128
T9
*
3
B136
B122
4
T12
B122
*
3
*
2
*
1
5M
6M
*
1
*
1
T12
1
2
B136
*
2
B128
3 4
1 2
6M
5M
2
6
5
4
3
1
2
1
35
31
30
32
29
34
33
21
20
19
18
17
16
28
27
26
15
14
13
12
11
25
23
22
24
10
3
4
9
1
2
8
7
6
5
8
7
6
5
4
3
2
1
:
:
ECM
: 5MT MODEL
: 6MT MODEL
: TERMINAL No.
OPTIONAL ARRANGEMENT
: 5MT MODEL : 1
6MT MODEL : 2
: 5MT MODEL : 3
6MT MODEL : 5
NEUTRAL
POSITION
SWITCH
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