Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual — part 310

EN(H4DOTC)(diag)-464

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

6

CHECK SECONDARY AIR PUMP.
Check the appearance of secondary air pump
and the condition of impeller.

Is the secondary air pump free
from deformation, cracks and
other damages? And does the
impeller rotate smoothly?

End.

Replace the sec-
ondary air pump.
<Ref. to EC(STI)-
27, Secondary Air
Pump.> <Ref. to
EC(w/o STI)-29,
Secondary Air
Pump.>

Step

Check

Yes

No

EN(H4DOTC)(diag)-465

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

FP:DTC P2610 ECM/PCM INTERNAL ENGINE OFF TIMER PERFORMANCE

DTC DETECTING CONDITION:

• Detected when two consecutive driving cycles with fault occur.

• GENERAL DESCRIPTION <Ref. to GD(H4DOTC)-289, DTC P2610 ECM/PCM INTERNAL ENGINE OFF

TIMER PERFORMANCE, Diagnostic Trouble Code (DTC) Detecting Criteria.>
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-

DURE, Inspection Mode.>.

FQ:DTC U0073 CAN FAILURE, BUS ‘OFF’ DETECTION

NOTE:

For the diagnostic procedure, refer to LAN section. <Ref. to LAN(diag)-2, Basic Diagnostic Procedure.>

FR:DTC U0122 CAN (VDC) DATA NOT LOADED

NOTE:

For the diagnostic procedure, refer to LAN section. <Ref. to LAN(diag)-2, Basic Diagnostic Procedure.>

FS:DTC U0140 CAN (BCU) DATA NOT LOADED

NOTE:

For the diagnostic procedure, refer to LAN section. <Ref. to LAN(diag)-2, Basic Diagnostic Procedure.>

FT:DTC U0416 CAN (VDC) DATA ABNORMAL

NOTE:

For the diagnostic procedure, refer to LAN section. <Ref. to LAN(diag)-2, Basic Diagnostic Procedure.>

FU:DTC U0422 CAN (BCU) DATA ABNORMAL

NOTE:

For the diagnostic procedure, refer to LAN section. <Ref. to LAN(diag)-2, Basic Diagnostic Procedure.>

Step

Check

Yes

No

1

CHECK FOR ANY OTHER DTC ON DISPLAY. Is any other DTC displayed?

Check DTC using
“List of Diagnostic
Trouble Code
(DTC)”. <Ref. to
EN(H4DOTC)(diag)
-87, List of Diagnos-
tic Trouble Code
(DTC).>

Replace the ECM.
<Ref. to FU(STI)-
59, Engine Control
Module (ECM).>
<Ref. to FU(w/o
STI)-57, Engine
Control Module
(ECM).>
NOTE:

The soak timer IC
is built into the
ECM.

EN(H4DOTC)(diag)-466

Diagnostic Procedure without Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

21.Diagnostic Procedure without Diagnostic Trouble Code (DTC)

A: CHECK SI-DRIVE (SUBARU INTELLIGENT DRIVE) SYSTEM

DIAGNOSIS:

SI-DRIVE mode does not switch.
CAUTION:

Note that SI-DRIVE system operates the following controls when it switches the modes.

1. Switches to S (SPORT) when turning the engine ON after turning the engine OFF in S# (SPORT

sharp) mode.

2. Returns to the mode last selected when turning the engine ON after turning the engine OFF in S

(SPORT) or I (Intelligent) mode.

3. Switches to S (SPORT) when the malfunction indicator light illuminates while the engine is run-

ning. In this case, Cannot switch to S# (SPORT sharp) or I (Intelligent) mode.

4. Cannot switch to S# (SPORT sharp), when engine coolant temperature tells that overheating may

occur. Switches to S (SPORT) while driving in S# (SPORT sharp) mode.

EN(H4DOTC)(diag)-467

Diagnostic Procedure without Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

1. SI-DRIVE MODE INDICATION DOES NOT CHANGE AND MODES DO NOT SWITCH AFTER

SWITCHING SI-DRIVE MODES

WIRING DIAGRAM:

• Engine electrical system, without SI-DRIVE <Ref. to WI-32, WITHOUT SI-DRIVE, WIRING DIAGRAM,

Engine Electrical System.>

• Engine electrical system, with SI-DRIVE <Ref. to WI-48, WITH SI-DRIVE, WIRING DIAGRAM, Engine

Electrical System.>

Step

Check

Yes

No

1

CHECK SI-DRIVE SELECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from the combi-
nation meter.
3) Measure the resistance between connec-
tors when the SI-DRIVE selector is operated.

Connector & terminal

(i10) No. 33 — (i10) No. 35:

Does the resistance change as
below?
S#: 3.48 — 3.85 kΩ
I: 0.95 — 1.05 kΩ
S: less than 1 Ω

Go to step

4.

Go to step

2.

EN-06527

*

i10

*

*

*

21

22

33

35

i53

R98

5

4

8

5

R33

I

S#

S

E

i97

i53

1 2 3

4 5 6 7

8 9 10 11 12 13 14 15 16

i97

2 3 4 5

1

6 7 8

i10

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 36 37 38 39 40

R33

1
5

2

3 4

6 7 8 9 10

COMBINATION METER

MULTI SELECT

SWITCH

(SI-DRIVE)

: TERMINAL No. OPTIONAL ARRANGEMENT