Toyota Sequoia (2005). Manual - part 647

–

DIAGNOSTICS

AIR CONDITIONING SYSTEM

DI–2383

2577

3

Perform active test by hand–held tester.

PREPARATION:
(a)

Connect the hand–held tester to the DLC3.

(b)

Turn the ignition switch ON and push the hand–held tester main SW ON.

CHECK:
Select the item below in the DATA LIST, and read the displays on the hand–held tester.
AIR CONDITIONING:

Item

Test Details / Display (Range)

Diagnostic Note

A/C MAG CLUTCH

Magnet clutch relay / OFF, ON

Operating sound can be heard

HINT:
Check with the engine running.
OK:

The operation sound of the MG CLT relay can be heard.

  NG

Go to step 5.

OK

4

Check harness and connector between integration control and panel (ACT termi-
nal) and ECM (ACT terminal) (See page 

IN–35

).

NG

Repair or replace harness or connector.

OK

Proceed to next circuit inspection shown in problem symptoms table (See page 

DI–2304

).

Z18060

1

5

2

3

1

2

3

5

I21361

3

DI–2384

–

DIAGNOSTICS

AIR CONDITIONING SYSTEM

2578

5

Check magnetic clutch relay.

PREPARATION:
Remove the magnetic clutch relay from the engine room J/B.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:

Tester connection

Condition

Specified condition

3 – 5

Always

10 k

Ω

 or higher

3 – 5

Voltage is applied 

between terminals

1 and 2

Below 1

Ω 

(Battery 

voltage is applied between

terminals 1 and 2)

NG

Replace magnetic clutch relay.

OK

6

Check A/C magnetic clutch.

PREPARATION:
Disconnect the magnetic clutch connector.
CHECK:
Connect the positive (+) battery lead to the magnetic clutch con-
nector terminal 3.
OK:

Magnetic clutch is energized.

NG

Replace A/C magnetic clutch.

OK

7

Check harness and connector between integration control and panel (MGC ter-
minal) and body ground (See page 

IN–35

).

NG

Repair or replace harness or connector.

OK

Replace integration control and panel.

I28847

AC1

Integration Control and Panel

I22

–

DIAGNOSTICS

AIR CONDITIONING SYSTEM

DI–2385

2579

8

Check harness and connector between integration control and panel (AC1 termi-
nal) and ECM (AC1 terminal) (See page 

IN–35

).

NG

Repair or replace harness or connector.

OK

9

Check voltage between terminal AC1 of integration control and panel connector
and body ground.

PREPARATION:
(a)

Disconnect the connector from the ECM.

(b)

Remove the integration control and panel with the con-
nectors still connected.

(c)

Start the engine and push the AUTO switch.

CHECK:
Measure the voltage between terminal AC1 of the integration
control and panel connector and body ground when the mag-
netic clutch is turned ON and OFF by the A/C switch.
OK:

Switch operation

Tester connection

Specified condition

ON

AC1 – Body ground

1.3 to 2.6 V

OFF

AC1 – Body ground

3.7 to 4.5 V

NG

Replace integration control and panel.

OK

Replace ECM (See page 

SF–80

).

EM0KQ–08

B13343

CO/HC Meter

–

ENGINE MECHANICAL

CO/HC

EM–1

2580

CO/HC

INSPECTION

HINT:
This check is used only to determine whether or not the idle CO/
HC complies with regulations.
1.

INITIAL CONDITIONS

(a)

Engine at normal operating temperature

(b)

Air cleaner installed

(c)

All pipes and hoses of air induction system connected

(d)

All accessories switched OFF

(e)

All vacuum lines properly connected

(f)

SFI system wiring connectors fully plugged

(g)

Ignition timing checked correctly

(h)

Transmission in neutral position

(i)

Tachometer and CO/HC meter calibrated by hand

2.

START ENGINE

3.

RACE ENGINE AT 2,500 RPM FOR APPROX. 180
SECONDS

4.

INSERT CO/HC METER TESTING PROBE AT LEAST
40 cm (1.3 ft) INTO TAILPIPE DURING IDLING