Toyota Sequoia (2005). Manual - part 52

DID7R–01

–

DIAGNOSTICS

ENGINE

DI–11

205

CHECK FOR INTERMITTENT PROBLEMS

HINT:
Hand–held tester only:
Inspect the vehicle’s ECM using check mode. Intermittent problems are easier to detect with a hand–held
tester when the ECM is in check mode. In check mode, the ECM uses 1trip detection logic, which is more
sensitive to malfunctions than normal mode (default), which uses 2 trip detection logic.
(d)

Clear DTCs (see page 

DI–43

).

(e)

Switch the ECM from normal mode to check mode using a hand–held tester (see page 

DI–44

).

(f)

Perform a simulation test (see page 

IN–24

).

(g)

Check and wiggle the harness(es), connector(s) and terminal(s) (see page 

IN–35

).

DID7S–01

DI–12

–

DIAGNOSTICS

ENGINE

206

BASIC INSPECTION

When the malfunction is not confirmed in the DTC check, troubleshooting should be carried out in all the
possible circuits considered as causes of the problem. In many cases, by carrying out the basic engine check
shown in the following flowchart, the location causing the problem can be found quickly and efficiently. There-
fore, using this check is essential in the engine troubleshooting.

1

Is battery voltage 11 V or more when engine stopped?

NO

 Charge or replace battery.

YES

2

Is engine cranked?

NO

Proceed to page 

ST–15

 and continue to trouble-

shoot.

YES

3

Does engine start?

NO

 Go to step 6.

YES

–

DIAGNOSTICS

ENGINE

DI–13

207

4

Check air filter.

PREPARATION:
Remove the air filter.
CHECK:
Visual check that the air filter is not excessively dirty or oily.

NG

 Repair or replace

 air filter

.

OK

5

Check idle speed (See page 

EM–11

).

NG 

Proceed to problem symptoms table on page

DI–33

.

OK

6

Check fuel pressure (See page 

SF–7

).

NG

Proceed to page 

SF–7

 and continue to trouble-

shoot.

OK

7

Check for spark (See page 

IG–1

).

NG

Proceed to page 

IG–1

 and continue to trouble-

shoot.

OK

Proceed to problem symptoms table on page

DI–33

.

DID7T–01

DI–14

–

DIAGNOSTICS

ENGINE

208

REGISTRATION

NOTICE:
The Vehicle Identification Number (VIN) must be input into the replacement ECM.
HINT:
The VIN is in the form of a 17–digit alphanumeric vehicle identification number. A hand–held tester is re-
quired to register the VIN.
1.

DESCRIPTION

This registration section consists of three parts, Input Instructions, Read VIN and Write VIN.
(a)

Input Instructions: Explains the general VIN input instructions using a hand–held tester.

(b)

Read VIN: Explains the VIN reading process in a flowchart. This process allows the VIN stored in the
ECM to be read, in order to confirm that the two VINs, provided with the vehicle and stored in the ve-
hicle’s ECM, are the same.

(c)

Write VIN: Explains the VIN writing process in a flowchart. This process allows the VIN to be input into
the ECM. If the ECM is changed, or the VIN and VIN do not match, the VIN can be registered, or over-
written in the ECM by following this procedure.

2.

INPUT INSTRUCTIONS

(a)

Hand–held tester
The arrow buttons (UP, DOWN, RIGHT and LEFT) and numerical buttons (0 to 9) are used, in order
to input the VIN.

(b)

Cursor Operation
To move the cursor around the tester screen, press the RIGHT and LEFT buttons.

(c)

Alphabetical Character Input
(1)

Press the UP and DOWN buttons to select the desired alphabetical character.

(2)

After selection, the cursor should move.

(d)

Numeric Character Input
(1)

Press the numerical button corresponding to the number that you want to input.

(2)

Select or input the correct character using the UP/DOWN buttons, or the numerical buttons.

HINT:
Numerical characters can be selected by using the UP and DOWN buttons.
(e)

Correction
(1)

After input, the cursor should move.

(2)

When correcting the input character(s), put the cursor onto the character using the RIGHT or
LEFT buttons.

(f)

Finishing Input Operation
(1)

Make sure that the input VIN matches the vehicle VIN after input.

(2)

Press the ENTER button on the tester.