Toyota Sequoia (2005). Manual - part 179

B17411

FC (+)

E4

–

DIAGNOSTICS

ENGINE

DI–511

705

6

Check for open in harness and connector between circuit opening relay and fuel
pump, and fuel pump and body ground (See page 

IN–35

).

NG

Repair or replace harness or connector.

OK

7

Check voltage between terminal FC and E1 of ECM connector.

PREPARATION:
Turn the ignition switch ON.
CHECK:
Measure the voltage between terminal FC of the ECM connec-
tor and body ground.
OK:

Voltage: 9 to 14 V

NG

Check for open in harness and connector be-
tween battery and FC terminal of ECM (See page

IN–35

).

OK

Proceed to problem symptoms table 
(See page 

DI–33

).

8

Check fuel pump resistor (See page 

SF–61

).

NG

Replace fuel pump resistor.

OK

Check for open in harness and connector between circuit opening relay and fuel pump resistor,
and fuel pump resistor and fuel pump (See page 

IN–35

).

A21044

Engine 
Room 
R/B

R–B

7

ECM

W

E4

11

C8

C10

1

2

B

R–L

15

2

2

Battery

7

6

I18 
Ignition 
Switch

4

1D

1G

6

B–R

R

GAUGE

Combination 
Meter

Malfunction 
Indicator 
Lamp

AM2

IG2

AM2

DI–512

–

DIAGNOSTICS

ENGINE

706

MIL Circuit

CIRCUIT DESCRIPTION

If the ECM detects a trouble, the MIL lights up. At this time, the ECM records a DTC in the memory.

WIRING DIAGRAM

DICFG–02

B17418

W

E5

–

DIAGNOSTICS

ENGINE

DI–513

707

INSPECTION PROCEDURE

HINT:
Troubleshoot each trouble symptom in accordance with the chart below.

MIL remains on

Start inspection from step 1

MIL does not light up

Start inspection from step 3

1

Clear DTC.

PREPARATION:
(a)

Connect the hand–held tester to the DLC3.

(b)

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

(c)

Read the DTC (See page 

DI–43

).

(d)

Clear the DTC (See page 

DI–43

).

CHECK:
(a)

Check that MIL does not light up.

OK:

Standard: MIL does not light up

OK

Repair circuit indicated by output code 
(See page 

DI–58

).

NG

2

Check Harness and connector (Check for short in wire harness).

PREPARATION:
(a)

Disconnect the E4 ECM connector.

(b)

Turn the ignition switch ON.

CHECK:
(a)

Check that MIL does not light up.

OK:

Standard: MIL does not light up

OK

Replace ECM (See page 

SF–80

).

NG

Check and repair harness and connector be-
tween combination meter and ECM.

DI–514

–

DIAGNOSTICS

ENGINE

708

3

Check that MIL lights up.

CHECK:
Check that MIL lights up when turning the ignition switch ON.
OK:

Standard: MIL lights up

OK

System OK.

NG

4

Inspect combination meter assy (MIL circuit).

See the combination meter troubleshooting on page 

BE–55

.

NG

Repair or replace bulb or combination meter as-
sembly.

OK

Check and repair harness and connector be-
tween combination meter and ECM.