Toyota Sequoia (2005). Manual - part 138

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–347

541

DI–348

–

DIAGNOSTICS

ENGINE

542

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 any other DTCs output (In addition to air injection system DTCs).

PREPARATION:
(a)

Connect a hand–held tester to the DLC3.

(b)

Turn the ignition switch to ON and turn the tester ON.

(c)

Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.

CHECK:
(a)

Read DTCs.

RESULT:

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 page 

DI–58

).

A

B17411

E4

AIDI

–

DIAGNOSTICS

ENGINE

DI–349

543

2

Check voltage between AIDI terminal of ECM and body ground.

PREPARATION:
(a)

Start the engine and warm it up.

(b)

Turn the ignition switch to OFF.

(c)

Connect a hand–held tester to the DLC3.

(d)

Turn the ignition switch ON and turn the tester ON.

(e)

Start the engine.

(f)

Select the following menu items: DIAGNOSIS/EN-
HANCED OBD II/SYSTEM CHECK/AIR INJ CHECK/AU-
TOMATIC OPERATION

CHECK:
Measure the voltage between terminal E4–13 (AIDI) of the
ECM connector and body ground when the air injection system
is both ON and OFF.
RESULT:

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 (be-
tween 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

B17411

E4

AIRV

AIRP

B17444

Wire Harness Side:

Air Injection Driver Connector

A41

SIP

SIV

DI

E

B17417

E4

AIRP

AIRV

DI–350

–

DIAGNOSTICS

ENGINE

544

3

Check voltage between AIRP, AIRV terminals of ECM and body ground.

PREPARATION:
Turn the ignition switch ON.
CHECK:
Measure the voltage between terminals E4–25 (AIRP), E4–4
(AIRV) of the ECM connector, and body ground.
OK:

Tester Connection

Specified Condition

E4–25 (AIRP) – Body ground

10 V or more

E4–4 (AIRV) – Body ground

10 V or more

NG

Replace ECM (See page 

SF–80

).

OK

4

Check for short in harness and connector between SIP terminal of air injection
driver and SIRP of ECM.

PREPARATION:
(a)

Disconnect the A41 air injection driver connector.

(b)

Disconnect the E4 ECM connector.

CHECK:
Measure the resistance between the wire harness side connec-
tors.
OK:

Standard:

Tester Connection

Specified Condition

SIP (A41–4) or AIRP (E4–25)  – 

Body ground

10 k

Ω

 or higher

SIV (A41–3) or AIRV (E4–4)  – 

Body ground

10 k

Ω

 or higher

E (A41–1) – Body ground

Below 1 

Ω

CHECK:
Measure the voltage between terminals DI (A41–2) and E
(A41–1) of the air injection driver wire harness side connectors.
OK:

Standard:

Tester Connection

Specified Condition

DI (A41–2) – E (A41–1)

9 V or more