P2445
2UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2444: Secondary Air Injection System Pump Stuck On Bank1
DTC P2444 - Secondary Air Injection System Pump Stuck On Bank1
DTC P2445 - Secondary Air Injection System Pump Stuck Off Bank1
DESCRIPTION
The Secondary Air Injection (AIR) system pumps air to the exhaust port to accelerate the activation of the catalyst. The secondary air injection system consists of the ECM, air pump, Air Switching Valve (ASV) (EASV), No. 2 Air Switching Valve (No. 2 ASV) (ASV1, 2), pressure sensor and Air Injection Control Driver (AID). The Air Switching Valve (ASV) (EASV) is an electromagnetic type and No. 2 Air Switching Valve (No. 2 ASV) (ASV1, 2) is a vacuum type.
The secondary air injection system pumps pressurized air to the exhaust port by the air pump through the ASV and No. 2 ASV. The ASV assists the No. 2 ASV. The No. 2 ASV also controls air supply.
The ECM sends signals to the AID, and then the AID operates the air pump and ASV. The pressure sensor detects pressure and exhaust pulsation in the system when the system operates and when it does not operate, and sends the data to the 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
TYPICAL ENABLING CONDITIONS
All:
Air pressure sensor stuck
Other:
TYPICAL MALFUNCTION THRESHOLDS
P2444 AIR pump ON stuck
P2445 AIR pump OFF stuck
P2445 AIR insufficient
P2445 AIR pressure sensor stuck
MONITOR RESULT
Refer to CHECKING MONITOR STATUS Mode 6 Data.
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT: Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air/fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.
PROCEDURE
1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2444 AND P2445)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch ON and turn the tester ON.
(c) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
(d) Read the DTCs.
Result:
HINT: If any other codes besides P2444 or P2445 is output, perform the troubleshooting for those DTCs first.
C -- GO TO DTC CHART
B -- INSPECT AIR INJECTION CONTROL DRIVER (POWER SOURCE CIRCUIT)
A -- Continue to next step.
2. CHECK AIR INJECTION SYSTEM PRESSURE
(a) Start the engine and warm it up.
(b) Turn the ignition switch OFF.
(c) Connect the Techstream to the DLC3.
(d) Turn the ignition switch ON and turn the tester ON.
(e) Start the engine.
(f) Enter the following menus: Powertrain / Engine and ECT / Utility / Air Injection Check / Manual Mode / 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 tester.
NOTE:
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 Techstream 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.
Standard pressure:
NG -- CHECK VACUUM HOSES
OK -- Continue to next step.
3. CHECK WHETHER DTC OUTPUT RECURS
(a) Start the engine and warm it up.
(b) Turn the ignition switch OFF.
(c) Connect the Techstream to the DLC3.
(d) Turn the ignition switch ON and turn the tester ON.
(e) Clear the DTCs DTC Check / Clear.
(f) Start the engine.
(g) Perform Active Test to operate the air injection system.
Enter the following menus: Powertrain / Engine and ECT / Utility / Air Injection Check / Automatic Mode.
(h) Perform the System Check operation by pressing Next.
(i) After operating the AIR system, perform the following to confirm the AIR system pending codes: Press the Exit button.
(j) Check pending DTCs.
(k) Turn the ignition switch OFF.
OK:
DTC P2444 or P2445 for the secondary air injection system is not output.
NG -- CHECK VACUUM HOSES
OK -- CHECK FOR INTERMITTENT PROBLEMS
4. CHECK VACUUM HOSES
(a) Remove the intake manifold Removal.
(b) Check the vacuum hose connection between the pressure sensor and air switching valve.
OK:
The vacuum hose is securely connected.
(c) Inspect the vacuum hose for blockage and damage.
OK:
The vacuum hose has no blockage and damage.
NG -- REPAIR OR REPLACE VACUUM HOSES
OK -- Continue to next step.
5. READ VALUE USING TECHSTREAM (AIR PRESSURE)
(a) Remove the intake manifold Removal.
(b) Connect the pressure gauge to the pressure sensor as shown in the illustration.
(c) Connect the Techstream to the DLC3.
(d) Turn the ignition switch ON and turn the tester ON (Do not start engine).
(e) Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Air pump pressure (absolute).
(f) Check that the pressure displayed on the 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.
NG -- REPLACE PRESSURE SENSOR
OK -- Continue to next step.
6. CHECK PIPING AND HOSES (CONNECTION OF ALL AIR INJECTION SYSTEM)
(a) Remove the intake manifold Removal.
(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.
(c) Check all pipes and hoses for blockages and damage.
OK:
All air injection pipes and hoses have no blockages and damage.
NG -- REPAIR OR REPLACE AIR INJECTION SYSTEM PIPING AND HOSES
OK -- Continue to next step.
7. INSPECT AIR INJECTION CONTROL DRIVER (POWER SOURCE CIRCUIT)
(a) Remove the intake manifold Removal.
(b) Disconnect the A43 and A44 Air Injection Control Driver (AID) connectors.
(c) Turn the ignition switch ON.
(d) Measure the voltage between terminals A44-5 (+B) and A43-1 (BATT) of the AID and body ground.
Standard voltage:
(e) Measure the resistance between terminal A44-1 (E) of the AID and body ground.
Standard resistance:
(f) Reconnect the AID connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
8. INSPECT ECM (AIRP AND AIRV VOLTAGE)
(a) Connect the Techstream 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 Techstream, measure voltage between terminal E8-25 (AIRP) and E8-4 (AIRV) of the AID connector and body ground.
Standard voltage:
Standard voltage:
(d) Enter the following menus: Powertrain / Engine and ECT / Utility / Air injection check / Manual Mode / 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
NOTE:
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 Techstream 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.
HINT: *: 35 to 55% of the +B voltage.
NG -- REPLACE ECM
OK -- Continue to next step.
9. CHECK HARNESS AND CONNECTOR (AIR INJECTION CONTROL DRIVER - BODY GROUND)
(a) Disconnect the A44 air injection driver connector.
(b) Disconnect the E8 ECM connector.
(c) Measure the resistance between the wire harness side connectors.
Standard resistance:
(d) Reconnect the air injection driver connector.
(e) Reconnect the ECM connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
10. INSPECT AIR PUMP (OPERATION)
(a) Remove the hose between EASV and ASV.
(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch ON and turn the tester ON.
(d) Enter the following menus: Powertrain / Engine and ECT / Utility / Air injection check / Manual Mode / Operation 3.
(e) When the air pump is operated, check that air comes out from the air pump.
HINT: Operation 3: AP: ON, EASV: CLOSE, ASV1: CLOSE, ASV2: CLOSE
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 Techstream 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 injection 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 injection check operation finishes.
OK:
Air comes out from the air pump
NG -- REPLACE AIR PUMP
OK -- CHECK WHETHER DTC OUTPUT NOT RECURS