Inspection Procedure

HINT:

The diagnostic information output from Air Injection Control Driver (AID) can be confirmed by connecting an oscilloscope to the diagnostic information terminal of the AID. It narrows a trouble area search to read the waveform on the oscilloscope when performing the AIR system intrusive operation function provided in the System Check.

Start the engine and warm it up.
Turn the ignition switch OFF.
Connect the Techstream to the DLC3.
Connect an oscilloscope probe to the AIDI terminal of the ECM.

Fig 1: Identifying ECM AIDI Terminal
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Start the engine and turn the tester ON.
On the tester, 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

Monitor the voltage output of the AID (duty ratio signal).

Fig 2: AID Voltage Graph (Duty Ratio Signal)

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Oscilloscope range

OSCILLOSCOPE RANGE

Items	Contents
Terminals	CH1 AIDI-E1
Equipment Settings	5 V/DIV, 20 to 40 ms/DIV
Conditions	Idling

NOTE:

This Air Injection Check only allows technicians to operate the AIR system for 5 seconds. Furthermore, the check can be performed 4 times a trip. If the test is repeated, intervals of at least 30 seconds are required between checks.
While the AIR system operation using the Techstream is prohibited, the tester displays the prohibition (WAIT or ERROR). If ERROR (Al STATUS NG) is displayed on the tester, stop the engine for 10 minutes and then try again.
Performing the Air Injection Check over and over again may cause damage in the secondary air injection system. If necessary, wait several minutes between tests to prevent overheating the system.
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.

AID DIAGNOSTIC SIGNAL WAVEFORMS

AID Diagnostic Signal Waveforms	ECM Commands	DTCs (ECM Output)	Suspected Trouble Areas
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002	Any Secondary Air Injection (AIR) System operation	P1613	Open in diagnostic signal circuit Air Injection Control Driver (AID) Open in AID BATT circuit (AID power source) Short between +B and diagnostic signal circuits
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002	AIR System. ON (Air pump ON, ASV ON)	P1613	Open or short in air pump or Air Switching Valve (ASV) command signal circuit (ECM-AID) Open in AID ground circuit Short between diagnostic signal circuit and body ground AID ECM
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002	AIR System OFF (Air pump OFF, ASV OFF)	-	Normal
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002	Air Pump ON	P0418	Short between air pump drive circuit and body ground Harness and connector (AID-Pump) Air pump AID ECM
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002	Air Pump OFF	P0418	Open in air pump drive circuit (AID-Pump) or short between air pump drive circuit and +B Harness and connector (AID-Pump) Air pump AID ECM
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002	ASV ON	P0412	Short between ASV drive circuit and body ground Harness and connector (AID-ASV) ASV AID ECM
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002	ASV OFF	P0412	Open in ASV drive circuit (AID-ASV) or short between ASV drive circuit +B Harness and connector (AID-ASV) AID ASV ECM
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002	AIR System. OFF (Air pump OFF, ASV OFF)	P1613	AID ECM
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002	AIR System ON (Air pump ON, ASV ON)	-	Normal
Other than above (other than 0, 20, 40, 80 and 100% duty)	-	P1613	AID Open in AID ground circuit

HINT:

Using the Air Injection Check operation of the System Check provided in the Techstream function, conditions for air fuel ratio and pressure in the secondary air injection system passage can be checked while the secondary air injection system is operating It helps technicians to troubleshoot the system when it is malfunctioning.
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.

INSPECT AIR SWITCHING VALVE ASSEMBLY

Remove the intake manifold (See REMOVAL ).
Disconnect the A47 Air Switching Valve (ASV) connector.

Measure the resistance of the ASV.

Standard resistance

STANDARD RESISTANCE

Tester Connection	Specified Condition
ASV (A47-1) - ASV (A47-2)	4.5 to 5.5 Ω

Reconnect the ASV connector.

NG: REPLACE AIR SWITCHING VALVE ASSEMBLY

Fig 3: Inspecting Air Switching Valve Assembly

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OK: Go to next step

CHECK HARNESS AND CONNECTOR (AIR SWITCHING VALVE - BODY GROUND)

Remove the intake manifold (See REMOVAL ).
Disconnect the A47 ASV connector.

Check the resistance between the wire harness side connector and body ground.

Standard resistance

STANDARD RESISTANCE

Tester Connection	Specified Condition
A47-2 - Body ground	Below 1 Ω

Reconnect the ASV connector.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 4: Checking Harness And Connector (Air Switching Valve - Body Ground)

OK: Go to next step

CHECK HARNESS AND CONNECTOR (AIR SWITCHING VALVE - AIR INJECTION CONTROL DRIVER)

Remove the intake manifold (See REMOVAL ).
Disconnect the A44 air injection driver connector.
Disconnect the A47 air switching valve connector.

Measure the resistance between the wire harness side connectors.

Standard resistance

STANDARD RESISTANCE

Tester Connection	Specified Condition
VV (A44-6) - A47-1	Below 1 Ω
VV (A44-6) or A47-1 - Body ground	10 kΩ or higher

Reconnect the air injection control driver connector.
Reconnect the ASV connector.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 5: Checking Harness And Connector (Air Switching Valve - Air Injection Control Driver)

OK: REPLACE AIR INJECTION CONTROL DRIVER