Inspection Procedure

WARNING: This page is about a different car, the 2007 Toyota Land Cruiser. However, it is still accessible from the selected car via links, so may be relevant.

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 AI 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 CAN VIM. Then connect the CAN VIM to the DLC3.
Connect an oscilloscope probe to the AIDI terminal of the ECM.

Fig 1: Identifying ECM Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Start the engine and turn the tester ON.
On the tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / SYSTEM CHECK / AIR INJ CHECK / MANUAL / OPERATION 1 and 2.

Fig 2: Intelligent Tester Display - AIR INJ CHECK Menu
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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: Voltage Output Of AID (Duty Ratio Signal)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Oscilloscope range

ITEMS CHART

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 AI 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 AI system operation using the intelligent tester 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 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.

SUSPECTED TROUBLE AREA CHART

AID Diagnostic Signal Waveform	ECM Command	DTC (ECM Output)	Suspected Trouble Area
100% Duty Ratio See 1waveform 1	Any Air Injection (Al) 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	AI 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	AI System: OFF (Air pump OFF, ASV OFF)	-	Normal
20% Duty Ratio See 3 waveform 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 3 waveform 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	AI System: OFF (Air pump OFF, ASV OFF)	P1613	AID ECM
80% Duty Ratio See 5waveform 5	AI 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: Waveform Graph (Waveform 1)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Waveform 2
0% Duty Ratio

Fig 5: Waveform Graph (Waveform 2)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Waveform 3
20% Duty Ratio

Fig 6: Waveform Graph (Waveform 3)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Waveform 4
40% Duty Ratio

Fig 7: Waveform Graph (Waveform 4)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Waveform 5
80% Duty Ratio

Fig 8: Waveform Graph (Waveform 5)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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. Freeze frame data records the engine condition when malfunctions are detected. 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.

INSPECT AIR SWITCHING VALVE

Remove the intake manifold (see REMOVAL ).
Disconnect the A56 Air Switching Valve (ASV) connector.

Measure the resistance of the ASV.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Specified Condition
1 - 2	4.5 to 5.5 Ω

Reconnect the ASV connector.

NG: REPLACE AIR SWITCHING VALVE

Fig 9: Identifying Air Switching Valve Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: GO TO Next Step

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

Remove the intake manifold (see REMOVAL ).
Disconnect the A56 ASV connector.

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

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Specified Condition
A56-2 - Body ground	Below 1 Ω

Reconnect the ASV connector.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 10: Identifying A56 ASV Connector Terminals

OK: GO TO Next Step

CHECK HARNESS AND CONNECTOR (AIR SWITCHING VALVE - AIR INJECTION CONTROL DRIVER)
1. Check harness and connector (see ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE AIR INJECTION CONTROL DRIVER