Inspection Procedure

HINT:

The diagnostic information output from the AID can be confirmed by connecting an oscilloscope to the diagnostic information terminal of the AID. It narrows the 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 intelligent tester to the DLC3 with CAN VIM
Connect an oscilloscope probe to the AIDI terminal of the ECM.

Fig 1: Identifying ECM Connector Terminal
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Start the engine and turn the tester ON.
On the tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / SYSTEM CHECK / AIR INJ SYSTEM.
On the tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / SYSTEM CHECK / AIR INJ CHECK / MANUAL OPERATION / OPERATION 1 and 2.

Fig 2: Identifying Scan Tool Display - AIR INJ CHECK
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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 3: Identifying Voltage Output Signal Wave Form

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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 intelligent tester is prohibited, the tester displays the prohibition (Al STATUS NG) 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 INJ 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 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.

DTC TABLE

AID Diagnostic Signal Waveform	ECM Command	DTC (ECM Output)	Suspected Trouble Area
100% Duty Ratio See 1waveform 1	Any Air Injection (AIR) System operation	P1613	Open in diagnostic signal circuit Air Injection Control Driver (AID) Open in AID +B circuit (AID power source) Short between +B circuit and diagnostic signal circuit
0% Duty Ratio See 2waveform 2	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
0% Duty Ratio See 2waveform 2	AIR System: OFF (Air pump OFF, ASV OFF)	-	Normal
20% Duty Ratio See 3waveform 3	Air Pump: ON	P0418	Short between air pump drive circuit and body ground Harness & connector (AID - Pump) Air Pump AID ECM
20% Duty Ratio See 3waveform 3	Air Pump: OFF	P0418	Open in air pump drive circuit (AID - Pump), or short between air pump drive circuit and +B Harness & connector (AID - Pump) Air Pump AID ECM
40% Duty Ratio - See 4waveform 4	ASV: ON	P0412	Short between ASV drive circuit and body ground Harness & connector (AID - ASV) ASV AID ECM
40% Duty Ratio - See 4waveform 4	ASV: OFF	P0412	Open in ASV drive circuit (AID - ASV), or short between ASV drive circuit and +B Harness & connector (AID - ASV) AID ASV ECM
80% Duty Ratio See 5waveform 5	AIR System: OFF (Air pump OFF, ASV OFF)	P1613	AID ECM
80% Duty Ratio See 5waveform 5	AIR System: ON (Air pump ON, ASV ON)	-	Normal
Excluding Above (excluding 0, 20, 40, 80, 100% duty)	-	P1613	AID Open in AID ground circuit

Waveform 1
100% Duty Ratio

Fig 4: Identifying Battery Voltage Waveform 1
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Waveform 2
0% Duty Ratio

Fig 5: Identifying Duty Ratio Waveform 2
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Waveform 3
20% Duty Ratio

Fig 6: Identifying Duty Ratio Waveform 3
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Waveform 4
40% Duty Ratio

Fig 7: Identifying Duty Ratio Waveform 4
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Waveform 5
80% Duty Ratio

Fig 8: Identifying Duty Ratio Waveform 5
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

HINT:

Using the AIR INJ CHECK operation of the SYSTEM CHECK provided in the intelligent tester 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 intelligent tester. 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 PUMP ASSEMBLY

Remove the intake manifold (See REMOVAL ).

Fig 9: Identifying A46 Air Pump Connector Terminal (Front View)

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Disconnect the A46 air pump connector.

Measure the resistance of the air pump.

Standard resistance

RESISTANCE SPECIFICATION

Tester Connection	Specified Condition
ASV (A46-1) - ASV (A46-2)	0.4 to 1.0 Ω

Reconnect the air pump connector.

NG: REPLACE AIR PUMP ASSEMBLY

OK: Go to next step

CHECK HARNESS AND CONNECTOR (AIR PUMP - BODY GROUND)

Remove the intake manifold (See REMOVAL ).

Fig 10: Identifying A46 Air Pump Connector Terminal

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Disconnect the A46 air pump connector.

Measure the resistance of the wire harness side connectors and body ground.

Standard resistance

RESISTANCE SPECIFICATION

Tester Connection	Specified Condition
A46-1 - Body ground	Below 1 Ω

Reconnect the air pump connector.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

CHECK HARNESS AND CONNECTOR (AIR INJECTION CONTROL DRIVER - AIR PUMP)

Remove the intake manifold (See REMOVAL ).

Fig 11: Identifying A43 Air Injection Control Driver Connector Terminal

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Disconnect the A43 air injection control driver connector.
Disconnect the A46 air pump connector.

Measure the resistance between the wire harness side connectors.

Standard resistance

RESISTANCE SPECIFICATION

Tester Connection	Specified Condition
VP (A43-2) - A46-2	Below 1 Ω
VP (A43-2) or A46-2 - Body ground	10 kΩ or higher

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

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE AIR INJECTION CONTROL DRIVER