SFI SYSTEM(w/o Canister Pump Module), Diagnostic DTC:P23AA72, P2C2972

DTC Code	DTC Name
P23AA72	Turbocharger/Supercharger Bypass Valve "A" Actuator Stuck Open
P2C2972	Turbocharger/Supercharger Bypass Valve "B" Actuator Stuck Open

DESCRIPTION

Refer to DTC P003312.

Click here

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory	Note
P23AA72	Turbocharger/Supercharger Bypass Valve "A" Actuator Stuck Open	Either of the following conditions is met (1 trip detection logic). Both of the following conditions are met: Accelerator pedal is fully released while the vehicle is stopped after engine warm-up Counter-electromotive force is not generated in the operation current when the air by-pass valve assembly (bank 1) is opened Both of the following conditions are met: Boost pressure is at or above a specified value The difference between intake air flow of bank 1 and bank 2 is equal to or higher than the threshold	Open or short in air by-pass valve assembly (bank 1) circuit Air by-pass valve assembly (bank 1) EFI-MAIN NO. 3 relay ECM	-	DTC stored	SAE: P23AA
P2C2972	Turbocharger/Supercharger Bypass Valve "B" Actuator Stuck Open	Either of the following conditions is met (1 trip detection logic). Both of the following conditions are met: Accelerator pedal is fully released while the vehicle is stopped after engine warm-up Counter-electromotive force is not generated in the operation current when the air by-pass valve assembly (bank 2) is opened Both of the following conditions are met: Boost pressure is at or above a specified value The difference between intake air flow of bank 1 and bank 2 is equal to or higher than the threshold	Open or short in air by-pass valve assembly (bank 2) circuit Air by-pass valve assembly (bank 2) EFI-MAIN NO. 3 relay ECM	-	DTC stored	SAE: P2C29

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P23AA72

Turbocharger/Supercharger Bypass Valve "A" Actuator Stuck Open

Either of the following conditions is met (1 trip detection logic).

Both of the following conditions are met:

Accelerator pedal is fully released while the vehicle is stopped after engine warm-up
Counter-electromotive force is not generated in the operation current when the air by-pass valve assembly (bank 1) is opened

Both of the following conditions are met:

Boost pressure is at or above a specified value
The difference between intake air flow of bank 1 and bank 2 is equal to or higher than the threshold

Open or short in air by-pass valve assembly (bank 1) circuit
Air by-pass valve assembly (bank 1)
EFI-MAIN NO. 3 relay
ECM

DTC stored

SAE: P23AA

P2C2972

Turbocharger/Supercharger Bypass Valve "B" Actuator Stuck Open

Either of the following conditions is met (1 trip detection logic).

Both of the following conditions are met:

Accelerator pedal is fully released while the vehicle is stopped after engine warm-up
Counter-electromotive force is not generated in the operation current when the air by-pass valve assembly (bank 2) is opened

Both of the following conditions are met:

Boost pressure is at or above a specified value
The difference between intake air flow of bank 1 and bank 2 is equal to or higher than the threshold

Open or short in air by-pass valve assembly (bank 2) circuit
Air by-pass valve assembly (bank 2)
EFI-MAIN NO. 3 relay
ECM

DTC stored

SAE: P2C29

MONITOR DESCRIPTION

Air By-pass Valve Assembly Stuck Open
When the accelerator pedal is fully released while the vehicle is stopped after engine warm-up, the ECM opens and closes the air by-pass valve assembly and checks the operation.

At that time, if the operating current value when the air by-pass valve assembly is opened differs from the normal state, the ECM judges that the air by-pass valve assembly is stuck open and stores a DTC.

Dual Intake Air Flow Difference Malfunction
When the difference between the intake air flow between bank 1 and bank 2 is the threshold value or more when boosting, the ECM determines that there is a malfunction in the intake and exhaust system and outputs a DTC.

CONFIRMATION DRIVING PATTERN

Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.
Turn the engine switch off and wait for at least 30 seconds.
Turn the engine switch on (IG).
Turn the GTS on.
Start the engine.
Idle the engine for 1 minute or more.
Enter the following menus: Powertrain / Engine / Trouble Codes.
Read the pending DTCs.
Tech Tips
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P23AA72 or P2C2972.

Check the DTC judgment result.

GTS Display	Description
NORMAL	DTC judgment completed System normal
ABNORMAL	DTC judgment completed System abnormal
INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions

Tech Tips

If the judgment result is NORMAL, the system is normal.
If the judgment result is ABNORMAL, the system is malfunctioning.

WIRING DIAGRAM

Refer to DTC P003312.

Click here

CAUTION / NOTICE / HINT

Note

Inspect the fuses for circuits related to this system before performing the following procedure.

Tech Tips

Read Freeze Frame Data using the GTS. The ECM records vehicle and driving condition information as Freeze Frame Data the moment a DTC is stored. When troubleshooting, Freeze Frame Data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.
Bank 1 refers to the bank that includes the No. 1 cylinder*.

*: The No. 1 cylinder is the cylinder which is farthest from the transmission.

Bank 2 refers to the bank that does not include the No. 1 cylinder.

DTC	Suspected Area
P23AA72	Bank 1
P2C2972	Bank 2

PROCEDURE

CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P23AA72 OR P2C2972)

Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Enter the following menus: Powertrain / Engine / Trouble Codes.

Read the DTCs.

Powertrain > Engine > Trouble Codes

Result

Result	Proceed to
DTC P23AA72 or P2C2972 is output	A
Both DTC P23AA72 and P2C2972 are output	B
DTC P23AA72 or P2C2972 and other DTCs are output	C

Tech Tips

If any DTCs other than P23AA72 or P2C2972 are output, troubleshoot those DTCs first.

CLEAR DTC Click here

GO TO DTC CHART Click here

PERFORM ACTIVE TEST USING GTS (ACTIVATE THE AIR BYPASS VALVE OR ACTIVATE THE AIR BYPASS VALVE BANK2)

Remove the air by-pass valve assembly.

Tech Tips

Do not disconnect the connector.
Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Enter the following menus: Powertrain / Engine / Active Test / Activate the Air Bypass Valve.

Powertrain > Engine > Active Test

Tester Display

Activate the Air Bypass Valve
Enter the following menus: Powertrain / Engine / Active Test / Activate the Air Bypass Valve Bank2.

Powertrain > Engine > Active Test

Tester Display

Activate the Air Bypass Valve Bank2

Tester Display
Activate the Air Bypass Valve

Tester Display
Activate the Air Bypass Valve Bank2

Check that the air by-pass valve assembly moves according to the Active Test.

OK
Air by-pass valve assembly moves according to the Active Test

Result

Proceed to
OK
NG

INSPECT AIR BY-PASS VALVE ASSEMBLY Click here

CLEAR DTC

Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Clear the DTCs.

Powertrain > Engine > Clear DTCs

Turn the engine switch off and wait for at least 30 seconds.

Result

Proceed to
NEXT

CHECK WHETHER DTC OUTPUT RECURS (P23AA72 OR P2C2972)

Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.

Powertrain > Engine > Utility

Tester Display

All Readiness
Input the DTC: P23AA72 or P2C2972.

Tester Display
All Readiness

Check the DTC judgment result.

Result

Proceed to

NORMAL

(DTCs are not output)

ABNORMAL

(DTC P23AA72 or P2C2972 is output)

END

INSPECT AIR BY-PASS VALVE ASSEMBLY

Inspect the air by-pass valve assembly, referring to the On-vehicle Inspection for Air by-pass Valve Assembly.

Click here

Inspect the air by-pass valve assembly, referring to the Inspection for Air by-pass Valve Assembly.

Result

Proceed to
OK
NG

REPLACE AIR BY-PASS VALVE ASSEMBLY Click here

CHECK TERMINAL VOLTAGE (POWER SOURCE OF AIR BY-PASS VALVE ASSEMBLY)

Disconnect the air by-pass valve assembly connector.
Turn the engine switch on (IG).

Measure the voltage according to the value(s) in the table below.

Standard Voltage

Tester Connection	Switch Condition	Specified Condition
D36-1 (+B) - Body ground	Engine switch on (IG)	11 to 14 V
D38-1 (+B) - Body ground	Engine switch on (IG)	11 to 14 V

Result

Proceed to
OK
NG

INSPECT EFI-MAIN NO. 3 RELAY Click here

CHECK HARNESS AND CONNECTOR (AIR BY-PASS VALVE ASSEMBLY - ECM)

Disconnect the air by-pass valve assembly connector.
Disconnect the ECM connector.

Measure the resistance according to the value(s) in the table below.

Standard Resistance

Tester Connection	Condition	Specified Condition
D36-2 (ABV) - D1-30 (ABV)	Always	Below 1 Ω
D38-2 (ABV2) - D1-29 (ABV2)	Always	Below 1 Ω
D36-2 (ABV) or D1-30 (ABV) - Body ground and other terminals	Always	10 kΩ or higher
D38-2 (ABV2) or D1-29 (ABV2) - Body ground and other terminals	Always	10 kΩ or higher

Result

Proceed to
OK
NG

REPLACE ECM Click here

REPAIR OR REPLACE HARNESS OR CONNECTOR

INSPECT EFI-MAIN NO. 3 RELAY

Inspect the EFI-MAIN NO. 3 relay.

Click here

Result

Proceed to
OK
NG

REPLACE EFI-MAIN NO. 3 RELAY

CHECK HARNESS AND CONNECTOR (POWER SOURCE OF EFI-MAIN NO. 3 RELAY)

Remove the EFI-MAIN NO. 3 relay from the No. 1 engine room relay block and junction block assembly.

*A	for LHD	*B	for RHD
*1	No. 1 Engine Room Relay Block and Junction Block Assembly	*2	EFI-MAIN NO. 3 Relay

Measure the voltage according to the value(s) in the table below.

Standard Voltage

Tester Connection	Condition	Specified Condition
3 (EFI-MAIN NO. 3 relay) - Body ground	Always	11 to 14 V

Result

Proceed to
OK
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - EFI-MAIN NO. 3 RELAY)

CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 3 RELAY - BODY GROUND)

Remove the EFI-MAIN NO. 3 relay from the No. 1 engine room relay block and junction block assembly.

Measure the resistance according to the value(s) in the table below.

Standard Resistance

Tester Connection	Condition	Specified Condition
1 (EFI-MAIN NO. 3 relay) - Body ground	Always	Below 1 Ω

Result

Proceed to
OK
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 3 RELAY - AIR BY-PASS VALVE ASSEMBLY)

Remove the EFI-MAIN NO. 3 relay, A/F HTR relay, VVT NO. 1 relay and VVT NO. 2 relay from the No. 1 engine room relay block and junction block assembly.

Tech Tips

Remove the A/F HTR relay, VVT NO. 1 relay and VVT NO. 2 relay connected between the checked terminals as the coil inside the relay influences the measurement value.
Disconnect the air by-pass valve assembly connector.

Measure the resistance according to the value(s) in the table below.

Standard Resistance

Tester Connection	Condition	Specified Condition
5 (EFI-MAIN NO. 3 relay) - D36-1 (+B)	Always	Below 1 Ω
5 (EFI-MAIN NO. 3 relay) - D38-1 (+B)	Always	Below 1 Ω
5 (EFI-MAIN NO. 3 relay) or D36-1 (+B) - Body ground and other terminals	Always	10 kΩ or higher
5 (EFI-MAIN NO. 3 relay) or D38-1 (+B) - Body ground and other terminals	Always	10 kΩ or higher

Result

Proceed to
OK
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI-MAIN NO. 1 RELAY - EFI-MAIN NO. 3 RELAY)

REPAIR OR REPLACE HARNESS OR CONNECTOR

CLEAR DTC

Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Clear the DTCs.

Powertrain > Engine > Clear DTCs

Turn the engine switch off and wait for at least 30 seconds.

Result

Proceed to
NEXT

READ OUTPUT DTC

Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.
Turn the engine switch off and wait for at least 30 seconds.
Start the engine and wait 1 minute or more.

Tech Tips

At this time, waste gate valve and air by-pass valve active detection is performed to check for malfunctions in the waste gate valve and air by-pass valve system.
Turn the GTS on.
Enter the following menus: Powertrain / Engine / Trouble Codes.

Read the DTCs.

Powertrain > Engine > Trouble Codes

Result

Result	Proceed to
DTC is not output	A
DTCs are output	B

GO TO DTC CHART Click here

CHECK INTAKE SYSTEM (AIR SUCTION)

Check that there is no air suction from each part of the intake system while idling (disconnected vacuum hoses, vacuum suction from gaskets).

Click here

OK
No air suction.

Tech Tips

Perform "Inspection After Repair" after repairing or replacing the intake system.

Click here

Result

Proceed to
OK
NG

REPAIR OR REPLACE INTAKE SYSTEM

CHECK INTAKE SYSTEM

Check that there is no blockage in the intake system.

Click here
Tech Tips
- If there is a difference in the values for the Data List items "Boost Pressure Sensor" and "Boost Pressure Sensor2" only in the boost range, the turbocharger may be the cause of the malfunction.
- Comparing the output values for the Data List items "MAF Sensor Bank1", "MAF Sensor Bank2", "Boost Pressure Sensor" and "Boost Pressure Sensor2" can be useful when troubleshooting.
- If there is no foreign matter in the intake system components, check the mass air flow meter sub-assembly and remove any foreign matter. If the foreign matter cannot be removed, replace the mass air flow meter sub-assembly.
- Perform "Inspection After Repair" after repairing or replacing the intake system.
  
  Click here

Check the air cleaner filter element sub-assembly.

Tech Tips

If there is any dirt or clogging in the air cleaner filter element sub-assembly, clean or replace it.

Result

Proceed to
OK
NG

REPAIR OR REPLACE INTAKE SYSTEM

CHECK EXHAUST SYSTEM

Check for clogging in the exhaust system.

Tech Tips

Clogging in the exhaust system can cause a catalyst erosion or clogging. Therefore, remove the exhaust system by performing a visual check.
Perform "Inspection After Repair" after repairing or replacing the exhaust system.

Click here

Result

Proceed to
OK
NG

REPAIR OR REPLACE EXHAUST SYSTEM

CHECK WHETHER DTC OUTPUT RECURS (P23AA72 AND/OR P2C2972)

Connect the GTS to the DLC3.
Start the engine.
Turn the GTS on.
Accelerate up to 30 km/h, change the shift position to 2nd gear and then drive for 5 seconds or more with the accelerator pedal completely depressed [A].

CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.
Enter the following menus: Powertrain / Engine / Trouble Codes [B].

Read the DTCs.

Powertrain > Engine > Trouble Codes

Result

Proceed to
NEXT

END