2UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2444,P2445; Secondary Air Injection System Pump Stuck On Bank1; 2006 MY LX470 [05/2005

Last Modified: 4-30-2014	6.6 C	Doc ID: RM000001BIU002X
Model Year: 2006	Model: LX470	Prod Date Range: [05/2005 - ]
Title: 2UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2444,P2445; Secondary Air Injection System Pump Stuck On Bank1; 2006 MY LX470 [05/2005 - ]

DTC

P2444

Secondary Air Injection System Pump Stuck On Bank1

DTC

P2445

Secondary Air Injection System Pump Stuck Off Bank1

DESCRIPTION

Refer to DTC P0412 .

DTC No.

DTC Detection Condition

Trouble Area

P2444

Air pump stuck ON.

The secondary air pressure is more than 5 kPa (38 mmHg) despite the ECM ordering the air pump to turn off.

(2 trip detection logic)

Short in air pump circuit
Air injection control driver (AID)
Pressure sensor
Open or short in pressure sensor circuit
ECM

P2445

Air pump stuck OFF or air injection volume is insufficient.

The amount of air flow is below the criteria.

(The secondary air pressure is less than specified value despite the ECM ordering the air pump turn ON.)

(2 trip detection logic)

Air pump fuse
Vacuum hose
Air pump assembly
Air injection control driver (AID)
Open in air pump circuit
Air injection system piping
Pressure sensor
Open or short in pressure sensor circuit
ECM

MONITOR DESCRIPTION

P2444:

The ECM observes the pressure in the secondary air passage using the pressure sensor located on the air switching valve in the secondary air injection system. The sensor measures the pressure in the secondary air passage and sends a signal to the ECM.

If the pressure level from the sensor exceeds a certain level despite the ECM turning off the air pump, the ECM interprets this as a fault in the secondary air injection system and sets a DTC.

P2445:

The ECM calculates the amount of air flow within the secondary air system based on the output values of the pressure sensor and mass air flow meter.

The ECM determines whether the amount of air flow is normal or not according to the calculated value. When the amount of air flow is below the criteria, the ECM stores the DTC and illuminates the MIL.

MONITOR STRATEGY

Related DTCs	(Case 1) P2444 Air pump stuck ON (Case 2) P2445 Air pump stuck OFF (Case 3) P2445 Air insufficient (Case 4) P2445 Air pressure sensor stuck
Required sensors/Components	AIR pressure sensor, AIR valve, AIR VSV bank 1, AIR VSV bank 2
Frequency of operation	Once per driving cycle
Duration	Within 60 seconds
MIL operation	2 driving cycles
Sequence operation	None

TYPICAL ENABLING CONDITIONS

Common conditions

This monitor runs whenever these DTCs are not present	P0010 - P0022: VVT system P0031 - P0052: Front A/F sensor heater P0100 - P0103: MAF sensor P0110 - P0113: IAT sensor P0115 - P0118: ECT sensor P0120 - P2125: TP sensor P0125: Closed loop P0171 - P0175: Fuel trim P0300 - P0308: Misfire P0325 - P0333: Knock sensor P0335: CKP sensor P0340 - P0346: VVT sensor P0351 - P0358: Igniter P0441 - P2420: EVAP system P0500: VSS P1340: CMP sensor P2195 - P2A03: A/F sensor P2430 - P2433: AIR pressure sensor
Atmospheric pressure	45 kPa or higher
Battery voltage	11.5 V or higher

Conditions for Case 1, Case 2 and Case 3

Sequence 1 - 5 are performed to monitor AIR	-
[Sequence 1]	-
Idle	ON
AIR	In operation
AIR pump	ON
AIR valve	ON
AIR VSV bank 1	ON (OFF)
AIR VSV bank 2	OFF (ON)
[Sequence 2]	-
Idle	ON
AIR	In operation
AIR valve	ON
AIR VSV bank 1	ON
AIR VSV bank 2	ON
[Sequence 3]	-
Engine RPM	Less than 3,750 rpm
AIR	In operation
AIR pump	ON
AIR valve	ON
AIR VSV bank 1	ON
AIR VSV bank 2	ON
[Sequence 4-a]	Performed when AIR pressure changes at sequence 2
Engine RPM	Less than 3,750 rpm
AIR	Not operating
AIR pump	OFF
AIR valve	OFF
AIR VSV bank 1	OFF
AIR VSV bank 2	OFF
[Sequence 4-b]	Performed when AIR pressure does not change at sequence 2
Engine RPM	Less than 3,750 rpm
AIR	Not operating
AIR pump	ON
AIR valve	ON
AIR VSV bank 1	ON (OFF)
AIR VSV bank 2	OFF (ON)
[Sequence 5]	-
Engine RPM	Less than 3,750 rpm
AIR	Not operating
AIR pump	OFF
AIR valve	ON
AIR VSV bank 1	OFF
AIR VSV bank 2	OFF

Conditions for Case 4

ECT at engine start	Lower than 5°C (41°F)
IAT at engine start	-15°C (5°F) or higher
Time that ECT is 80°C (176°F) or higher	10 to 60 minutes
Vehicle speed	80 km/h or more
Cumulative intake air amount	172 g/sec. or more
Sequence 3 of AIR monitor	Completed
AIR valve	OFF
AIR VSV bank 1	OFF
AIR VSV bank 2	OFF

TYPICAL MALFUNCTION THRESHOLDS

Thresholds for Case 1

Averaged AIR pressure at sequence 3	More than 1 kPa
Cumulative AIR pressure pulse at sequence 3	More than 15 kPa
Averaged AIR pressure at sequence 5	More than 5 kPa
Cumulative AIR pressure pulse at sequence 5	More than 30 kPa

Thresholds for Case 2

Averaged AIR pressure at sequence 3	Less than 1 kPa
Cumulative AIR pressure pulse at sequence 3	More than 15 kPa
Averaged AIR pressure at sequence 5	Less than 5 kPa
Cumulative AIR pressure pulse at sequence 5	Less than 30 kPa

Thresholds for Case 3

AIR amount

100 L/min. or less

Thresholds for Case 4

AIR pressure change

15 kPa or more

MONITOR RESULT

Refer to CHECKING MONITOR STATUS .

Monitor ID	Test ID	Scaling	Unit	Description
$71	$E1	Multiply by 0.01	g/sec.	AIR amount for AIR insufficient
$71	$E2	Multiply by 0.01	kPa	Averaged AIR pressure for AIR pump stuck ON
$71	$E3	Multiply by 0.01	kPa	Averaged AIR pressure for AIR pump stuck OFF
$71	$E4	Multiply by 0.01	kPa	AIR pressure pulse for AIR valve and AIR VSV stuck open
$71	$E5	Multiply by 0.01	kPa	AIR pressure pulse for AIR valve and AIR VSV stuck close
$71	$E6	Multiply by 0.01	kPa	AIR pressure difference for AIR valve
$71	$E7	Multiply by 0.01	kPa	AIR pressure difference for AIR VSV bank 1
$71	$E8	Multiply by 0.01	kPa	AIR pressure difference for AIR VSV bank 2
$71	$E9	Multiply by 0.01	kPa	AIR pressure pulse for AIR VSV stuck open bank 1 and bank 2

WIRING DIAGRAM

Refer to DTC P0412 .

INSPECTION PROCEDURE

HINT:

Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, 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.

PROCEDURE

1.	CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2444 AND P2445)

(a) Connect the intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.

(b) Turn the ignition switch ON and push the intelligent tester main switch ON.

(d) Read the DTCs.

Result

Display (DTC output)	Proceed to
P2445	A
P2444	B
P2444 and P2445	B
"P2444 and P2445" and other DTCs	C

HINT:

If any other codes besides P2444 or P2445 is output, perform the troubleshooting for those DTCs first.

GO TO STEP 7

GO TO DTC CHART

2.	CHECK AIR INJECTION SYSTEM PRESSURE

(a) Start the engine and warm it up.

(b) Turn the ignition switch OFF.

(d) Turn the ignition switch ON and push the intelligent tester main switch ON.

(e) Start the engine.

(f) Enter the following menus: DIAGNOSIS / ENHANCED OBD II / SYSTEM CHECK / AIR INJ CHECK / MANUAL / OPERATION 1 and 2.

HINT:

OPERATION 1: AP: OFF; EASV: CLOSE; ASV1: CLOSE; ASV2: CLOSE

OPERATION 2: AP: ON; EASV: OPEN; ASV1: OPEN; ASV2: OPEN

(g) Check that the PRESSURE on the intelligent tester.

NOTICE:

This test only allows technicians to operate the AI system for 5 seconds. Furthermore, the test can be performed 4 times a trip. If the test is repeated, intervals of at least 30 seconds are required between tests.
While the AI system operation using the intelligent tester is prohibited, the tester displays the prohibition (WAIT or ERROR). If ERROR (AI STATUS NG) is displayed on the tester, stop the engine for 10 minutes and then try again.
When performing the AIR INJ CHECK operation after the battery cable has been reconnected, wait for 7 minutes with the ignition switch turned ON or the engine running.
Turn the ignition switch OFF when the AIR INJ CHECK operation finishes.

Standard pressure:

Tester operation	Pressure
Operation 1	Less than 2.5 kPa
Operation 2	5 kPa or more

GO TO STEP 4

3.	CHECK WHETHER DTC OUTPUT RECURS

(a) Start the engine and warm it up.

(b) Turn the ignition switch OFF.

(d) Turn the ignition switch ON and turn the tester ON.

(e) Clear the DTCs .

(f) Start the engine.

(g) Perform ACTIVE TEST to operate the air injection system.

Enter the following menus: DIAGNOSIS / ENHANCED OBD II / SYSTEM CHECK / AIR INJ CHECK / AUTOMATIC

NOTICE:

When performing the AIR INJ CHECK operation after the battery cable has been reconnected, wait for 7 minutes with the ignition switch turned ON or the engine running.
Turn the ignition switch OFF when the AIR INJ CHECK operation finishes.

(h) After operating the secondary air injection system, confirm the pending codes for the secondary air injection system by entering the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO / PENDING CODES.

(i) Read DTC and check DTC.

OK:

DTC P2444 or P2445 for the secondary air injection system is not output.

GO TO STEP 4

CHECK FOR INTERMITTENT PROBLEMS

4.	CHECK VACUUM HOSE

(a) Remove the intake manifold .

(b) Check the vacuum hose connection between the pressure sensor and air switching valve.

OK:

The vacuum hose is securely connected.

OK:

The vacuum hose has no blockage and damage.

REPAIR OR REPLACE VACUUM HOSE

5.	READ VALUE USING INTELLIGENT TESTER (AIR VOLTAGE)

(a) Remove the intake manifold .

(b) Connect the pressure gauge to the pressure sensor as shown in the illustration.

(d) Turn the ignition switch ON and push the intelligent tester main switch ON (Do not start engine).

(e) Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / AIR PMP PRS (A).

HINT:

The value of AIR PMP PRS (A) in the DATA LIST shows absolute pressure.

(f) Check that the pressure displayed on the intelligent tester fluctuates when applying the pressure to the pressure sensor with the pressure gauge.

OK:

Pressure fluctuates in response to the pressure applied with pressure gauge.

REPLACE PRESSURE SENSOR

6.	CHECK PIPING AND HOSES (CONNECTION OF ALL AIR INJECTION SYSTEM)

(a) Remove the intake manifold .

(b) Check that all the pipes and hoses between the air pump and air switching valve are securely connected.

OK:

All air injection pipes and hoses are securely connected.

OK:

All air injection pipes and hoses have no blockages and damage.

REPAIR OR REPLACE AIR INJECTION SYSTEM PIPING AND HOSES

7.	INSPECT AIR INJECTION CONTROL DRIVER (POWER SOURCE CIRCUIT)

(a) Disconnect the A55 and A56 Air Injection Control Driver (AID)connectors.

(b) Turn the ignition switch ON.

Standard voltage:

Tester Connection	Specified Condition
A56-5 (+B) - Body ground	10 V or more
A55-1 (BATT) - Body ground	10 V or more

(d) Measure the resistance between the terminal A56-1 (GND) of the AID and body ground.

Standard resistance:

Tester Connection	Specified Condition
A56-1 (GND) - Body ground	Below 1 Ω

(e) Reconnect the AID connector.

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.	INSPECT ECM (AIRP AND AIRV VOLTAGE)

(a) Connect the intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.

(b) Turn the ignition switch ON and turn the tester ON.

(c) When the air pump and air switching valve are operated using the intelligent tester, measure voltage between terminal E10-25 (AIRP) and E10-4 (AIRV) of the AID connector and body ground.

(d) Enter the following menus: DIAGNOSIS / ENHANCED OBD II / SYSTEM CHECK / AIR INJ CHECK / MANUAL / OPERATION 1 and 2.

HINT:

OPERATION 1: AP: OFF; EASV: CLOSE; ASV1: CLOSE; ASV2: CLOSE

OPERATION 2: AP: ON; EASV: OPEN; ASV1: OPEN; ASV2: OPEN

NOTICE:

This test only allows technicians to operate the AI system for 5 seconds. Furthermore, the test can be performed 4 times a trip. If the test is repeated, intervals of at least 30 seconds are required between tests.
While the AI system operation using the intelligent tester is prohibited, the tester displays the prohibition (WAIT or ERROR). If ERROR (AI STATUS NG) is displayed on the tester, stop the engine for 10 minutes and then try again.
When performing the AIR INJ CHECK operation after the battery cable has been reconnected, wait for 7 minutes with the ignition switch turned ON or the engine running.
Turn the ignition switch OFF when the AIR INJ CHECK operation finishes.

Standard voltage:

Tester Connection	Air pump operation	Specified Condition
AIRP (E10-25) - Body ground	ON	10 V or more
AIRP (E10-25) - Body ground	OFF	3.5 to 7.7 V*

Standard voltage:

Tester Connection	Air switching valve (ASV) operation (EASV)	Specified Condition
AIRV (E10-4) - Body ground	OPEN	10 V or more
AIRV (E10-4) - Body ground	CLOSE	3.5 to 7.7 V*

HINT:

*: 35 to 55% of the +B voltage.

REPLACE ECM

9.	CHECK HARNESS AND CONNECTOR (AIR INJECTION CONTROL DRIVER - ECM)

(a) Check harness and connector .

REPAIR OR REPLACE HARNESS OR CONNECTOR

10.	INSPECT AIR PUMP (OPERATION)

(a) Remove the hose between EASV and ASV.

(b) Connect the intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.

(d) Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / AIR INJ CHECK / MANUAL / OPERATION 2.

(e) When the air pump is operated, check that air comes out from the air pump.

HINT:

OPERATION 2: AP: ON; EASV: OPEN; ASV1: OPEN; ASV2: OPEN

NOTICE:

This test only allows technicians to operate the AI system for 5 seconds. Furthermore, the test can be performed 4 times a trip. If the test is repeated, intervals of at least 30 seconds are required between tests.
While the AI system operation using the intelligent tester is prohibited, the tester displays the prohibition (WAIT or ERROR). If ERROR (AI STATUS NG) is displayed on the tester, stop the engine for 10 minutes and then try again.
When performing the AIR INJ CHECK operation after the battery cable has been reconnected, wait for 7 minutes with the ignition switch turned ON or the engine running.
Turn the ignition switch OFF when the AIR INJ CHECK operation finishes.

OK:

Air comes out from the air pump

REPLACE AIR PUMP

CHECK WHETHER DTC OUTPUT NOT RECURS