CEL and DTC Codes Point to Secondary Air Pump?

IANK

MEMBER
2006 SUBARU WRX
92,000 MILES

I just recently threw a CEL, luckily my roommate bought a OBDII tester and it came back with the following codes: 2444, 2443, 2432, and 1410. All the research I've done on the internet points to problems with the secondary air pump or related systems, however I'm not sure where to start. Some have suggested taking it to a mechanic, but being a do-it-yourself kind of guy I'd rather pinpoint the problem and fix it myself. Having worked with only a N/A 94 and 02 Honda Civic in the past, this turbo'd Subaru is new to me. Thanks for your time.

2 Replies

RIVERMIKERAT

MECHANIC
6,110 POSTS

P1410-Secondary Air Injection System Secondary Switching Valve Stuck Open.
P2432-Secondary Air Injection System Air Flow/Pressure Sensor Circuit Voltage High.
P2443-Secondary Air Injection System Secondary Switching Valve Stuck Closed (Bank 2)
P2444-Secondary Air Injection System Pump Stuck On
ENGINE (DIAGNOSTICS) (H4DOTC) -2006 Subaru Impreza WRX
Page 1 of 1
DTC P1410: SECONDARY AIR INJECTION SYSTEM SWITCHING VALVE STUCK OPEN

DTC DETECTING CONDITION:
? Immediately at fault recognition
? GENERAL DESCRIPTION < Ref. To DTC P1410 SECONDARY AIR INJECTION SYSTEM SWITCHING VALVE STUCK OPEN, Diagnostic Trouble Code (DTC) Detecting Criteria.>
CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode < Ref. To OPERATION, Clear Memory Mode.> And Inspection
Mode < Ref. To PROCEDURE, Inspection Mode.>
WIRING DIAGRAM:
Fig. 144: Secondary Air Injection System Switching Valve - Wiring Diagram
DTC P1410 DIAGNOSIS PROCEDURE
Step
1 CHECK SECONDARY AIR COMBI VALVE.
Check
Yes
No
Replace the secondary air combi valve which has air
leakage. < Ref. To SECONDARY AIR
COMBI VALVE. >
A temporary poor contact occurs.
Check for poor contact of
connector.
1.
Remove the secondary air combi valve.
Blow air through inlet port of secondary air
combi valve and check the pipe connection for air leakage.
Is there air leakage from
pipe connection?
2.

ENGINE (DIAGNOSTICS) (H4DOTC) -2006 Subaru Impreza WRX
Page 1 of 2
DTC P2432: SECONDARY AIR INJECTION SYSTEM AIR FLOW / PRESSURE SENSOR
CIRCUIT LOW

DTC DETECTING CONDITION:
? Immediately at fault recognition
? GENERAL DESCRIPTION < Ref. To DTC P2432 SECONDARY AIR INJECTION SYSTEM AIR FLOW/PRESSURE SENSOR CIRCUIT LOW, Diagnostic Trouble Code (DTC)
Detecting Criteria.>
CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode < Ref. To OPERATION, Clear Memory Mode.> And Inspection
Mode < Ref. To PROCEDURE, Inspection Mode.>
WIRING DIAGRAM:
Fig. 177: Secondary Air Injection System Switching Valve - Wiring Diagram
DTC P2432 DIAGNOSIS PROCEDURE
Step
1 CHECK HARNESS BETWEEN ECM AND
SECONDARY AIR COMBI VALVE LH CONNECTOR.
Check
Yes
No
1.
Turn the ignition switch to OFF.
Disconnect the connector from ECM and secondary
air combi valve LH. Measure the resistance of
harness between ECM and secondary air combi valve
LH connector terminal.
2.
3.
Is the resistance
less than 1?
Repair the open circuit in harness between ECM and
secondary air combi valve LH connector terminal.
Go to step 2.
Connector & terminal
(B134) No. 27 - (E116) No. 2:
(B134) No. 19 - (E116) No. 1:
(B134) No. 29 - (E116) No. 3:
2 CHECK HARNESS BETWEEN ECM AND
SECONDARY AIR COMBI
Repair the ground short

12/23/2011
ENGINE (DIAGNOSTICS) (H4DOTC) -2006 Subaru Impreza WRX
Page 2 of 2
VALVE LH CONNECTOR.
Measure the resistance of harness Is the
between ECM and chassis ground.
Connector & terminal
(B134) No. 27 - Chassis ground:
circuit in harness between ECM and secondary air
combi valve LH connector
Check poor contact terminal. In connector.
A temporary poor contact occurs.
Resistance more than 1
M?

ENGINE (DIAGNOSTICS) (H4DOTC) -2006 Subaru Impreza WRX
Page 1 of 2
DTC P2444: SECONDARY AIR INJECTION SYSTEM PUMP STUCK ON DTC DETECTING
CONDITION

? Immediately at fault recognition
? GENERAL DESCRIPTION < Ref. To DTC P2444 SECONDARY AIR INJECTION SYSTEM PUMP STUCK ON, Diagnostic Trouble Code (DTC) Detecting Criteria.>
CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode < Ref. To OPERATION, Clear Memory Mode.> And Inspection
Mode < Ref. To PROCEDURE, Inspection Mode.>
WIRING DIAGRAM:
Fig. 181: Secondary Air Injection System Switching Valve - Wiring Diagram
DTC DIAGNOSIS PROCEDURE Step
1 CHECK SECONDARY AIR PIPE PRESSURE.
Check
Yes
No
1.
Turn the ignition switch to ON (engine
OFF).
Using Subaru Select Monitor, read the data
of secondary air pipe
pressure, and compare and actual atmospheric
Replace the secondary air combi valve (LH). < Ref.
To SECONDARY AIR COMBI VALVE. >
2.
Is the difference between its pressure
Go to step 2.
NOTE:
The secondary air pressure sensor is
it with atmospheric pressure.
Pressure more than 6.7 kPa (50 mmHg, 2.0
inHg or 0.97 psig)?
Integrated with secondary air combi
NOTE:
Subaru Select Monitor
valve (LH).
For detailed operation procedures, refer to the
"READ CURRENT DATA FOR ENGINE". < Ref. To
SUBARU SELECT MONITOR. >
2 CHECK POWER SUPPLY TO
SECONDARY AIR PUMP.

A temporary poor contact
occurs. Check for poor contact
of connector.
Is the voltage more than 10 V?
1.
Turn the ignition switch to ON (engine
OFF).
Measure the voltage between secondary air
pump and chassis
Go to step 3.
2.

12/23/2011
ENGINE (DIAGNOSTICS) (H4DOTC) -2006 Subaru Impreza WRX
Page 2 of 2
ground.
Connector & terminal
(F127) No. 2 (+) - Chassis ground (-):
3 CHECK SECONDARY AIR PUMP RELAY.
1.
Turn the ignition switch to OFF.
Remove the secondary air pump relay from
relay box.
Measure the resistance between secondary air
pump relay terminals.
Repair the battery short
circuit in harness between Replace the secondary air pump relay secondary air
and secondary air pump connector terminal.
2.
Is the resistance more than 1 M?
Pump relay.
3.
Terminals No. 4 - No. 5: