Inspection Procedure

HINT:

The diagnostic information output from the Air Injection Control Driver (AID) can be confirmed by connecting an oscilloscope to the diagnostic information terminal of the AID. A trouble area search can be narrowed by reading 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
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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: OFF

Operation 2: AP: ON; EASV: OPEN; ASV1: OPEN; ASV2: OPEN
Monitor the voltage output of the AID (duty ratio signal).

Fig 2: AID Voltage Output Graph (Duty Ratio Signal)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Oscilloscope range:

ITEM CONTENT REFERENCE

Item	Content
Terminal	CH1 AIDI-E1
Equipment Setting	5 V/DIV, 20 to 40 msec/DIV
Condition	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.

CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P1613)

Connect the Techstream to the DLC3.
Turn the ignition switch ON and turn the tester ON.
Enter the following menus: Powertrain/Engine and ECT/Trouble Codes.

Read the DTCs

Result

RESULT REFERENCE

Display (DTC Output)	Proceed to
P1613	A
P1613 and other DTCs	B

HINT:

If any DTCs other than P1613 are output, troubleshoot those DTCs first.

B: GO TO DTC CHART

A: Go to Next Step

PERFORM ACTIVE TEST BY TECHSTREAM (AIDI VOLTAGE)

Start the engine and warm it up.
Turn the ignition switch OFF.
Connect the Techstream to the DLC3.
Turn the ignition switch ON and turn the tester ON.
Start the engine.
Enter the following menus: Powertrain/Engine and ECT/Utility/Air Injection Check/Automatic Mode

Fig 3: Identifying ECM AIDI Terminal
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NOTE:
- 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.

Measure the voltage between AIDI terminal of the ECM connector and body ground when the air injection system is ON and OFF.

Result

RESULT REFERENCE

Results	Suspected Trouble Areas	Proceed to
Fixed at Low (1.6 V or less) even when AIR system ON (Air pump ON, ASV ON)	Short between air pump or air switching valve command signal circuit and body ground Open in air pump command signal circuit (between ECM and AID) Open in ASV command signal circuit (between ECM and AID) Open in AID ground circuit (between AID and body ground) Diagnostic signal circuit ground short AID ECM	A
Fixed at High (12 V or more) even when AIR system OFF (Air pump OFF, ASV OFF)	Open in diagnostic signal circuit (ECM - AID) Short between +B circuit and diagnostic signal circuit (ECM - AID) Open in AID power source circuit AID ECM	B
Other than above: Fluctuating (duty signal excluding 20, 40, 80 %)	AID Open in AID ground circuit (between AID and body ground)	C

B: Go to step 5

C: Go to step 8

A: Go to Next Step

INSPECT ECM (AIRP AND AIRV VOLTAGE)

Turn the ignition switch ON.

Measure the voltage between terminal E9-25 (AIRP), E9-4 (AIRV) of the ECM connector and body ground.

Standard voltage

STANDARD VOLTAGE

Tester Connection	Specified Condition
AIRP (E9-25) - Body ground	10 V or more
AIRV (E9-4) - Body ground	10 V or more

NG: REPLACE ECM

Fig 4: Inspecting ECM (AIRP And AIRV Voltage)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to Next Step

CHECK HARNESS AND CONNECTOR (ECM - AIR INJECTION CONTROL DRIVER, AIR INJECTION CONTROL DRIVER - BODY GROUND)

Disconnect the A44 air injection driver connector.
Disconnect the E9 ECM connector.

Measure the resistance between the wire harness side connectors.

Standard resistance

STANDARD RESISTANCE

Tester Connection	Specified Condition
SIP (A44-4) or AIRP (E9-25) - Body ground	10 kΩ or higher
SIV (A44-3) or AIRV (E9-4) - Body ground	10 kΩ or higher
E (A44-1) - Body ground	Below 1 Ω

Measure the voltage between terminals DI (A44-2) and E (A44-1) of the air injection driver wire harness side connectors.

Standard voltage

STANDARD VOLTAGE

Tester Connection	Specified Condition
DI (A44-2) - E (A44-1)	9 V or more

Fig 5: Checking Harness And Connector (ECM - Air Injection Control Driver, Air Injection Control Driver - Body Ground)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Reconnect the air injection driver connector.
Reconnect the ECM connector.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE AIR INJECTION CONTROL DRIVER

CHECK POWER SOURCE OF AIR INJECTION CONTROL DRIVER

Disconnect the A44 Air Injection Control Driver (AID) connector.
Turn the ignition switch ON.

Measure the voltage between the terminal +B (A44-5) and E (A44-1) of the AID connector.

Standard voltage

STANDARD VOLTAGE

Tester Connection	Specified Condition
+B (A44-5) - E (A44-1)	10 V or more

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 6: Checking Power Source Of Air Injection Control Driver

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to Next Step

INSPECT AIR INJECTION CONTROL DRIVER (Dl TERMINAL VOLTAGE)

Disconnect the A44 AID connector.
Turn the ignition switch ON.

Measure the voltage between the terminal A44-2 (Dl) of the AID connector and body ground.

Standard voltage

STANDARD VOLTAGE

Tester Connection	Specified Condition
Dl (A44-2) - Body ground	10 V or more

Reconnect the AID connector.

OK: REPLACE AIR INJECTION CONTROL DRIVER

Fig 7: Inspecting Air Injection Control Driver (DI Terminal Voltage)

NG: Go to Next Step

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

Disconnect the A44 air injection driver connector.
Disconnect the E9 ECM connector.

Check the resistance between the wire harness side connectors.

Standard resistance

STANDARD RESISTANCE

Tester Connection	Specified Condition
DI (A44-2) - AIDI (E9-13)	Below 1 Ω
Dl (A44-2) or AIDI (E9-13) - +B (A44-5)	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 8: Checking Harness And Connector (ECM - Air Injection Control Driver)

OK: REPLACE ECM

CHECK HARNESS AND CONNECTOR (AIR INJECTION DRIVER - BODY GROUND)

Disconnect the A44 AID connector.

Measure the resistance between the terminal E (A44-1) of the AID connector and body ground.

Standard resistance

STANDARD RESISTANCE

Tester Connection	Specified Condition
E (A44-1) - Body ground	Below 1 Ω

Reconnect the AID connector. NG

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 9: Identifying A44 AID Connector Terminals

OK: Go to Next Step

REPLACE AIR INJECTION CONTROL DRIVER
1. Replace the AID.
CHECK WHETHER DTC OUTPUT RECURS (DTC P1613)
1. Connect the Techstream to the DLC3.
2. Turn the ignition switch ON and turn the tester ON.
3. Clear the DTCs (See DTC CHECK/CLEAR ).
4. Start the engine.
5. Perform Active Test to operate the air injection system. Enter the following menus: Powertrain/Engine and ECT/Utility/Air Injection Check/Automatic Mode.
6. Perform the System Check operation by pressing Next.
7. After operating the AIR system, perform the following to confirm the AIR system pending codes. Press the Exit button.
8. Check pending DTCs.
  NOTE:
  - 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: DTC P1613 for the secondary air injection system is not output.
NG: GO TO DTC CHART

OK: END