Toyota Sequoia (2005). Manual - part 161

A23475

Pressure Gauge

Pressure Sensor

–

DIAGNOSTICS

ENGINE

DI–439

633

12

Check air pump operation.

PREPARATION:
(a)

Connect the pressure gauge to the air switching valve as
shown in the illustration.

(b)

Connect the hand–held tester to the DLC3.

(c)

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 secondary air injection system pressure.

(b)

Select the following menu items: DIAGNOSIS/EN-
HANCED OBD II/ACTIVE TEST/AIR INJ CHECK/MANU-
AL OPERATION/OPERATION 3

HINT:
OPERATION  2: AP:ON,  EASV:CLOSE, ASV1:CLOSE,
ASV2:CLOSE
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:
25 to 30 kPa or more

NG

Replace air pump.

OK

DI–440

–

DIAGNOSTICS

ENGINE

634

13

Check whether DTC output recurs.

PREPARATION:
(a)

Start the engine and warm it up.

(b)

Turn the ignition switch OFF.

(c)

Connect a hand–held tester to the DLC3.

(d)

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

(e)

Clear the DTCs (see page 

DI–43

).

(f)

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

(c)

Read DTC and check no DTC.

OK:

DTC P2444 or P2445 for the secondary air injection system is not output.

NG

Check for intermittent problems 
(See page 

DI–11

).

OK

END

B17443

Wire Harness Side:

Air Injection Driver Connector

A40

B17438

Wire Harness Side:

Air Pump Connector

A43

–

DIAGNOSTICS

ENGINE

DI–441

635

14

Check for open and short in harness and connector between air injection driver
and air pump.

PREPARATION:
(a)

Remove the intake manifold (see page 

EM–36

).

(b)

Disconnect the A40 air injection driver connector.

(c)

Disconnect the A43 air pump connector.

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

Standard:

Tester Connection

Specified Condition

VP (A40–2) – A43–2

Below 1 

Ω

VP (A40–2) or A43–2  – 

Body ground

10 k

Ω

 or higher

NG

Repair or replace harness or connector.

OK

Replace air injection driver.

A23667

Soak Timer Circuit

Ignition Switch

IGSW

Power

ECM

EFI MAIN

MREL

+B

15 A

Source IC

Soak Timer IC

Main Relay
Control IC

Battery

DI–442

–

DIAGNOSTICS

ENGINE

636

DTC

P2610

ECM/PCM Internal Engine OFF Timer Perfor-
mance

DTC SUMMARY

DTC

Monitoring Items

Malfunction Detection Conditions

Trouble Areas

Detection

Timings

Detection

Logic

P2610

Soak timer (built into ECM)

ECM internal malfunction

ECM

Engine
running

2 trip

CIRCUIT DESCRIPTION

To ensure the accuracy of the EVAP (Evaporative Emission) monitor values, the soak timer, which is built
into the ECM, measures 5 hours (

15 minutes) from when the ignition switch is turned OFF, before the moni-

tor is run. This allows the fuel to cool down, which stabilizes the Fuel Tank Pressure (FTP). When 5 hours
have elapsed, the ECM turns on.

MONITOR DESCRIPTION

5 hours after the ignition switch is turned OFF, the soak timer activates the ECM to begin the EVAP system
monitor. While the engine is running, the ECM monitors the synchronization of the soak timer and the CPU
clock. If these two are not synchronized, the ECM interprets this as a malfunction, illuminates the MIL and
sets the DTC (2 trip detection logic).

MONITOR STRATEGY

Related DTCs

P2610

Soak timer (built into ECM)

Required sensors/components

ECM

Frequency of operation

Once per driving cycle

Duration

10 min.

MIL operation

2 driving cycles

Sequence of operation

None

DIDFX–01