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 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 to OFF.
Connect a hand-held tester to the DLC3.
Connect an oscilloscope probe to the AIDI terminal of the ECM.

Fig 1: Connecting Oscilloscope Probe To AIDI Terminal
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Start the engine and turn the tester ON.
On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / SYSTEM CHECK / AIR INJ SYSTEM.

On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / SYSTEM CHECK / AIR INJ CHECK / MANUAL OPERATION / 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

Fig 2: AIR INJ Check Display Screen

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Oscilloscope range:

OSCILLOSCOPE RANGE

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

Fig 3: Example Of Duty Ratio Signal Blinking Pattern

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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 hand-held tester is prohibited, the tester displays the prohibition (WAIT or ERROR). If the ERROR (AI 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 the damage in the secondary air injection system. If necessary, put an interval of 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 to ON or the engine running.
Turn the ignition switch to OFF when the AIR INJ 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 Air Injection (AI) 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
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002	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
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002	AI 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 & 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 & 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 & 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 and +B Harness & connector (AID-ASV) AID ASV ECM
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002	AI System: OFF (Air pump OFF, ASV OFF)	P1613	AID ECM
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002	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

HINT:

Using the AIR INJ CHECK operation of the SYSTEM CHECK provided in the hand-held 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 a hand-held 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.

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

Connect a hand-held tester to the DLC3.
Turn the ignition switch to ON and turn the tester ON.
Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.

Read DTCs.

Result:

ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P1613)

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 (See DIAGNOSTIC TROUBLE CODE CHART )

A: Go to next step.

PERFORM ACTIVE TEST USING HAND-HELD TESTER (AIDI VOLTAGE)

Start the engine and warm it up.
Turn the ignition switch to OFF.
Connect a hand-held tester to the DLC3.
Turn the ignition switch ON and turn the tester ON.
Start the engine.
Select the following menu items: DIAGNOSIS/ENHANCED OBD II/SYSTEM CHECK/AIR INJ CHECK/AUTOMATIC OPERATION
NOTE:
- When performing the AIR INJ CHECK operation after the battery cable has been reconnected, wait for 7 minutes with the ignition switch turned to ON or the engine running.
- Turn the ignition switch to OFF when the AIR INJ CHECK operation finishes.
Measure voltage between terminal E9-13 (AIDI) of the ECM connector and body ground when the air injection system is ON and OFF.

Fig 4: Performing Active Test Using Hand-Held Tester (AIDI Voltage)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Result:

AIDI VOLTAGE

Results	Suspected Trouble Areas	Proceed To
Fixed at Low (1.6 V or less) even when AI 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 AI 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 voltage between terminal E9-25 (AIRP), E9-4 (AIRV) of the ECM connector and body ground.

Standard:

ECM (AIRP AND AIRV VOLTAGE)

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

Fig 5: Inspecting ECM (AIRP And AIRV Voltage)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE ECM (See REPLACEMENT )

OK: Go to next step.

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

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

Measure the resistance between the wire harness side connectors.

Fig 6: Identifying Air Injection Driver Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard:

ECM - AIR INJECTION DRIVER, AIR INJECTION DRIVER - BODY GROUND (1 OF 2)

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

Standard:

ECM - AIR INJECTION DRIVER, AIR INJECTION DRIVER - BODY GROUND (2 OF 2)

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

Fig 7: Checking Harness And Connector (ECM - Air Injection Driver, Air Injection 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 DRIVER

CHECK POWER SOURCE OF AIR INJECTION DRIVER

Disconnect the A44 air injection driver connector.
Turn the ignition switch to ON.

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

Standard:

POWER SOURCE OF AIR INJECTION DRIVER

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

Fig 8: Checking Power Source Of Air Injection Driver

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step.

INSPECT AIR INJECTION DRIVER (DI TERMINAL VOLTAGE)

Disconnect the A44 air injection driver connector.
Turn the ignition switch to ON.

Measure the voltage between the terminal A44-2 (DI) of the air injection driver connector and body ground.

Standard:

AIR INJECTION DRIVER (DI TERMINAL VOLTAGE)

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

Fig 9: Inspecting Air Injection Driver (DI Terminal Voltage)

Reconnect the air injection driver.

NG: Go to step 7

OK: Go to next step.

CHECK HARNESS AND CONNECTOR (ECM - AIR INJECTION DRIVER)

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

Measure the resistance between the wire harness side connectors.

Fig 10: Identifying Air Injection Driver Connector

Standard:

ECM - AIR INJECTION DRIVER

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

Fig 11: Checking Harness And Connector (ECM - Air Injection Driver)

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

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE ECM (See REPLACEMENT )

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

Disconnect the A44 air injection driver connector.

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

Standard:

AIR INJECTION DRIVER - BODY GROUND

Tester Connection	Specified Condition
E (A44-1) - Body ground	10 V or more

Fig 12: Checking Harness Or Connector (Air Injection Driver - Body Ground)

Reconnect the air injection driver connector.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step.

REPLACE AIR INJECTION DRIVER
CHECK WHETHER DTC OUTPUT RECURS (DTC P1613)
1. Connect a hand-held tester to the DLC3.
2. Turn the ignition switch to 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.
  Select the following menu items: DIAGNOSIS/ENHANCED OBD II/SYSTEM CHECK/AIR INJ CHECK/AUTOMATIC OPERATION
6. After operating the secondary air injection system, confirm the pending codes of the secondary air injection system by selecting the following menu items: DIAGNOSIS/ENHANCED OBD II/DTC INFO/PENDING CODES.
  NOTE:
  - When performing the AIR INJ CHECK operation after the battery cable has been reconnected, wait for 7 minutes with the ignition switch turned to ON or the engine running.
  - Turn the ignition switch to OFF when the AIR INJ CHECK operation finishes.
OK:

DTC P1613 for the secondary air injection system is not output.

NG: GO TO DTC CHART (See DIAGNOSTIC TROUBLE CODE CHART )

OK: END