Toyota Sequoia (2005). Manual - part 139

B17444

Wire Harness Side:

Air Injection Driver Connector

A41

+B

E

B17444

Wire Harness Side:

Air Injection Driver Connector

A41

DI

–

DIAGNOSTICS

ENGINE

DI–351

545

NG

Repair or replace harness or connector.

OK

Replace air injection driver.

5

Inspect air injection driver power source circuit.

PREPARATION:
(a)

Disconnect the A41 air injection driver connector.

(b)

Turn the ignition switch to ON.

CHECK:
Measure the voltage between terminals +B (A41–5) and E
(A41–1) of the air injection driver connector.
OK:

Standard:

Tester Connection

Specified Condition

A41–5 (+B) – E (A41–1)

10 V or more

NG

Repair or replace harness or connector.

OK

6

Check voltage between DI terminals of air injection driver and body ground.

PREPARATION:
(a)

Disconnect the A41 air injection driver connector.

(b)

Turn the ignition switch to ON.

CHECK:
Measure the voltage between terminal A41–2 (DI) of the air in-
jection driver connector and body ground.
OK:

Standard:

Tester Connection

Specified Condition

A41–2 (DI) – Body ground

10 V or more

NG

Go to step 7.

OK

B17444

Wire Harness Side:

Air Injection Driver Connector

A41

DI

+B

B17417

E4

AIDI

B17444

Wire Harness Side:

Air Injection Driver Connector

A41

E

DI–352

–

DIAGNOSTICS

ENGINE

546

7

Check for short in harness and connector between DI terminal of air injection
driver and AIDI terminal of ECM.

PREPARATION:
(a)

Disconnect the A41 air injection driver connector.

(b)

Disconnect the E4 ECM connector.

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

Standard:

Tester Connection

Specified Condition

DI (A41–2) – AIDI (E4–13)

Below 1 

Ω

DI (A41–2) or AIDI (E4–13)  – 

+B (A41–5)

10 k

Ω

 or higher

NG

Repair or replace harness or connector.

OK

Replace ECM (See page 

SF–80

).

8

Inspect air injection driver ground circuit.

PREPARATION:
Disconnect the A41 air injection driver connector.
CHECK:
Measure the resistance between terminal E (A41–1) of the air
injection driver connector and body ground.
OK:

Standard:

Tester Connection

Specified Condition

E (A41–1) – Body ground

10 V or more

NG

Repair or replace harness or connector.

OK

–

DIAGNOSTICS

ENGINE

DI–353

547

9

Replace air injection driver.

NEXT

10

Check whether DTC output recurs.

PREPARATION:
(a)

Connect a hand–held tester to the DLC3.

(b)

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

(c)

Clear the DTCs (see page 

DI–43

).

(d)

Start the engine.

CHECK:
(a)

Perform SYSTEM CHECK to operate the air injection system.
Select the following menu items: DIAGNOSIS/ENHANCED OBD II/SYSTEM CHECK/AIR INJ
CHECK/AUTOMATIC OPERATION

(b)

After operating the secondary air injection system, confirm the pending codes of the secondary air in-
jection system by selecting the following menu items: DIAGNOSIS/ENHANCED OBD II/DTC INFO/
PENDING CODES.

OK:

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

NG

Go to DTC chart (See page 

DI–58

).

OK

END

DI–354

–

DIAGNOSTICS

ENGINE

548

DTC

P2102

Throttle Actuator Control Motor Circuit Low

DTC

P2103

Throttle Actuator Control Motor Circuit High

CIRCUIT DESCRIPTION

The throttle motor is operated by the ECM. It opens and closes the throttle valve.
The opening angle of the throttle valve is detected by the throttle position sensor which is mounted on the
throttle body. The throttle position sensor provides feedback to the ECM. This feedback allows the ECM to
control the throttle motor and monitor the throttle opening angle as the ECM responds to driver inputs.
HINT:
This Electrical Throttle Control System (ETCS) does not use a throttle cable.

DTC No.

DTC Detection Condition

Trouble Area

P2102

Conditions (a) and (b) continue for 2.0 seconds:

(1 trip detection logic)

(a) Throttle control motor output duty 80 % or more

(b) Throttle control motor current less than 0.5 A or less

Open in throttle control motor and sensor circuit

Throttle control motor and sensor

ECM

P2103

Either of the following condition is met.

(1 trip detection logic)

(a) Throttle control motor current 10 A or more (0.1 sec)

(b) Throttle control motor current 7 A or more (0.6 sec.)

Short in throttle control motor and sensor circuit

Throttle control motor and sensor

Throttle valve

Throttle body

ECM

MONITOR DESCRIPTION

The ECM monitors the current through the electronic throttle motor and detects malfunctions or open circuit
in the throttle motor based on the voltage of the current. When the current deviates from the standard, the
ECM concludes that there is a fault in the throttle motor.
Or, if the throttle valve is not functioning properly (for example, stuck ON), the ECM concludes that there is
a fault, turns on the MIL and sets a DTC is set.
Example:
When the current is more than 10 A. Or the current is less than 0.5 A when the motor driving duty ratio is
exceeding 80%. The ECM concludes that the current is out of range, turns on the MIL and a DTC is set.

FAIL SAFE

If the ETCS (Electronic Throttle Control System) has a malfunction, the ECM cuts off current to the throttle
control motor. The throttle control valve returns to a predetermined opening angle (approximately 16

°

) by

the force of the return spring. The ECM then adjusts the engine output by controlling the fuel infection (inter-
mittent fuel–cut) and ignition timing in accordance with the accelerator pedal opening angle to enable the
vehicle to continue at a minimum speed.
If the accelerator pedal is depressed firmly and slowly, the vehicle can be driven slowly.
If a ”pass” condition is detected and then the ignition switch is turned OFF, the fail–safe operation will stop
and the system will return to normal condition.

DICF9–02