Toyota Sequoia (2005). Manual - part 142

–

DIAGNOSTICS

ENGINE

DI–363

557

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.

MONITOR STRATEGY

Related DTCs

P2118

Throttle actuator motor power supply line range

check (Low voltage)

Required sensors/components

Throttle actuator motor

Frequency of operation

Continuous

Duration

0.8 sec.

MIL operation

Immediate

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

It

Specification

Item

Minimum

Maximum

The monitor will run whenever this DTC is
not present

See page 

DI–18

Actuator power

ON

Battery voltage

8 V

–

TYPICAL MALFUNCTION THRESHOLDS

Detection Criteria

Threshold

Throttle actuator motor power supply voltage

Less than 4 V

COMPONENT OPERATING RANGE

Parameter

Standard Value

Throttle actuator motor power supply voltage

9 to 14 V

A05652

A18100

ECM

+BM

E4

7

W–G

Battery

2H

3

ETCS

2D

1

Engine Room J/B

B

IA4

13

W–G

4

F10
Fusible Link
Block

5

B

DI–364

–

DIAGNOSTICS

ENGINE

558

WIRING DIAGRAM

A21380

Engine Room J/B

ETCS
Fuse

B17411

+BM (+)

E6

E4

E1 (–)

–

DIAGNOSTICS

ENGINE

DI–365

559

INSPECTION PROCEDURE

HINT:
Read freeze frame data using 

the hand−held tester.

 Freeze frame data records the engine conditions when

a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was
running or stopped, if the engine was warmed up or not, if the air–fuel ratio was lean or rich, as well as other
data from the time when a malfunction occurred.

1

Check ETCS fuse.

PREPARATION:
Remove the ETCS fuse from the engine room J/B.
CHECK:
Check the resistance of the ETCS fuse.
OK:

Below 1 

Ω

NG

Check for short in all harness and components
connected to ETCS fuse.

OK

2

Check voltage between terminal +BM and E1 of ECM connector.

CHECK:
Measure the voltage between the specified terminals of the E6
and E4 ECM connector.
OK:

Standard:

Tester Connection

Specified Condition

+BM (E4–7) – E6 (E6–1)

9 to 14 V

OK

Check for intermittent problems
(See page 

DI–11

).

NG

A21380

Engine Room J/B

ETCS
Fuse

B17417

E4

+BM

DI–366

–

DIAGNOSTICS

ENGINE

560

3

Check for open or short in harness or connector between battery and ETCS fuse,
ETCS fuse and ECM.

PREPARATION:
(a)

Remove the ETCS fuse from the engine room J/B.

(b)

Disconnect the E4 ECM connector.

CHECK:
Measure the resistance of the wire harness side connector be-
tween the ETCS fuse and ECM.
OK:

Standard:

Tester Connection

Specified Condition

Engine Room J/B (ETCS fuse 

terminal) – +BM (E4–7)

Below 1 

Ω

Engine Room J/B (ETCS fuse 

terminal) or +BM (E4–7) – 

Body ground

10 k

Ω

 or higher

PREPARATION:
(a)

Remove the ETCS fuse from the engine room J/B.

(b)

Disconnect the battery positive terminal.

CHECK:
Measure the resistance of the wire harness side connector be-
tween the ETCS fuse and battery.
OK:

Standard:

Tester Connection

Specified Condition

Engine Room J/B (ETCS fuse 

terminal) – Battery positive terminal

Below 1 

Ω

Engine Room J/B (ETCS fuse 

terminal) or 

Battery positive terminal – Body ground

10 k

Ω

 or higher

NG

Repair or replace harness or connector.

OK

Check engine room J/B.