Toyota Sequoia (2005). Manual - part 110

–

DIAGNOSTICS

ENGINE

DI–243

437

TYPICAL ENABLING CONDITIONS

It

Specification

Item

Minimum

Maximum

The monitor will run whenever this DTC is
not present

See page 

DI–18

Case 1:

Air pump

Operating

Air switching valve

Operating

Battery voltage

8 V

–

Ignition switch

ON

Starter

OFF

Case 2:

Air pump

Not operating

Air switching valve

Not operating

Battery voltage

8 V

–

Ignition switch

ON

Starter

OFF

TYPICAL MALFUNCTION THRESHOLDS

Detection Criteria

Threshold

Case 1, 2:

Diagnostic signal duty ratio from air injection driver

11 to 29 %

COMPONENT OPERATING RANGE

Parameter

Standard Value

Diagnostic signal duty ratio from air injection driver

70 to 90% when secondary air injection system operating

and

0% when secondary air injection system not operating

WIRING DIAGRAM

Refer to DTC P0412 on page 

DI–234

.

B17411

ECM Connector

E1

AIDI

A16555

AIR INJ CHECK

AIR PUMP............................ON
EASV   ............................OPEN
ASV1.   .............................OPEN
ASV2...............................OPEN
A/F BANK1.......................19.05
A/F BANK2.......................19.05
PRESSURE....................17 kPa
PULSATION..............25.39 kPa
AI STATUS...........................OK
Remaining Time 05 sec.

Press [EXIT] to quit

Example: 80% Duty Signal

5 V/DIV.

GND

20 ms/DIV.

DI–244

–

DIAGNOSTICS

ENGINE

438

INSPECTION PROCEDURE

HINT:
The diagnostic information output from the AID can be confirmed by connecting an oscilloscope to the diag-
nostic information terminal of the AID. It narrows the trouble area search to read the waveform on the oscillo-
scope when performing the AI system intrusive operation function provided in the SYSTEM CHECK.

(1)

Start the engine and warm it up.

(2)

Turn the ignition switch to OFF.

(3)

Connect a hand–held tester to the DLC3.

(4)

Connect an oscilloscope probe to the AIDI terminal
of the ECM.

(5)

Start the engine and turn the tester ON.

(6)

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

(7)

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:CLOSE
OPERATION 2: AP: ON, EASV:OPEN, ASV1:OPEN,
ASV2:OPEN

(8)

Monitor the voltage output of the AID (duty ratio sig-
nal).

Oscilloscope range:

Items

Contents

Terminals

CH1: AIDI – E1

Equipment Settings

5 V/Division, 20 to 40 ms/Division

Conditions

Idling

NOTICE:

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 (AI STATUS NG) or ERROR. At this time 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.

A23464

AID Diagnostic Signal Waveforms

ECM

Commands

DTCs

Suspected Trouble Areas

(ECM Output)

100 % Duty ratio

+B

Almost Battery Voltage

GND

0 % Duty ratio

+B

Fixed at Low Voltage

GND

20 % Duty ratio

20 %

+B

GND

40 % Duty ratio

40 %

+B

GND

80 % Duty ratio

80 %

+B

GND

Excluding above
(excluding 0, 20, 40, 80, 100 % duty)

Air Pump: ON

Air Pump: OFF

ASV: ON

ASV: OFF

AI System: OFF

(Air pump OFF, 

ASV OFF)

AI System: ON

(Air pump ON,

ASV ON)

P1613

P0418

P0418

P0412

P0412

P1613

P1613

Air Injection Control Driver (AID)

Open in AID+B circuit (AID power source)

Open or short in air pump or Air Switching Valve

AID
ECM

Open in air pump drive circuit (AID–Pump) ,

Harness & connector (AID–Pump)
Air Pump

AID

ECM

Short between air pump drive circuit and body ground

AID
ECM

Harness & connector (AID–Pump)
Air Pump

Open in ASV drive circuit (AID–ASV),

Harness & connector (AID–ASV)
ASV
AID

ECM

Short between ASV drive circuit and body ground

Harness & connector (AID–ASV)

AID

ECM

ECM

Normal

AID

AID

or short between air pump drive circuit and +B

or short between ASV drive circuit and +B





ASV

–

AI System: OFF

(Air pump OFF, 

ASV OFF)

AI System: ON

(Air pump ON,

ASV ON)

Normal

Any Air Injection

(AI) System op-

eration

P1613

Open in AID ground circuit

Short between +B circuit and diagnostic signal circuit

Short between diagnostic signal circuit and body

(ASV) command signal circuit (ECM–AID)

ground

Open in AID ground circuit

Open in diagnostic signal circuit

–

DIAGNOSTICS

ENGINE

DI–245

439

B17438

Wire Harness Side:

Air Pump Connector

A43

DI–246

–

DIAGNOSTICS

ENGINE

440

HINT:

Using the AIR INJ CHECK operation of the SYSTEM CHECK provided in the hand–held tester func-
tion, conditions for air–fuel ratio and pressure in the secondary air injection system passage can be
checked while the secondary air injection system operating. It helps technicians to troubleshoot the
system when it malfunctioning.

Read freeze frame data using a hand–held tester. Freeze frame data record 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.

1

Check voltage between terminal 2 of air pump and body ground.

PREPARATION:
(a)

Remove the intake manifold (see page 

EM–36

).

(b)

Disconnect the A43 air pump connector.

(c)

Connect the hand–held tester to the DLC3.

(d)

Turn the ignition switch ON and turn the tester ON.

CHECK:
(a)

When the air pump is operated using the hand–held tes-
ter, measure the voltage between terminal A43–2 of the
air injection driver connector and body ground.

(b)

Select the following menu items: DIAGNOSIS/EN-
HANCED OBD II/SYSTEM CHECK/ AIR INJ CHECK/
MANUAL OPERATION/OPERATION  1 and 3

HINT:
OPERATION 1: AP:OFF, EASV:CLOSE, ASV1:CLOSE,
ASV2:CLOSE
OPERATION 3: AP:ON, EASV:OPEN, ASV1:OPEN,
ASV2:OPEN
NOTICE:
This test only allows technicians to operate the AI system
for 5 seconds. Furthermore, the test can be performed 4
times a trip. If the test is repeated, intervals of at least 30
seconds are required between tests.
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..
OK:

Standard:

Tester operation

Tester Connection

Specified Condition

Operation 3

A43–2 – Body ground

10 V or more

Operation 1

A43–2 – Body ground

Below 1.0 V

NG

Go to step 4.

OK