Toyota Sequoia (2005). Manual - part 191

DIDIY–01

D14145

E8

E7

E6

E5

E4

–

DIAGNOSTICS

AUTOMATIC TRANSMISSION

DI–559

753

TERMINALS OF ECM

1.

ECM

HINT:
Each ECM terminal’s standard voltage is shown in the table below.
In the table, first follow the information under ”Condition”. Look under ”Symbols (Terminal No.)” for the termi-
nals to be inspected. The standard voltage between the terminals is shown under ”Specific Condition”.
Use the illustration above as a reference for the ECM terminals.

Symbols (Terminals No.)

Wiring Color

Terminal Description

Condition

Specified Condition

LMS (E5–9) – E1 (E6–1)

P–L – BR

L shift position switch sig-

nal

IG switch ON

10 to 14 V

↑

↑

↑

IG switch ON and Press continu-

ously shift position L switch

Below 1 V

2 (E5–10) – E1 (E6–1)

L – BR

2 shift position switch sig-

nal

IG switch ON and shift lever 2 and L

position

10 to 14 V

↑

↑

↑

IG switch ON and shift lever except

2 and L position

Below 1 V

R (E5–11) – E1 (E6–1)

B–Y – BR

R shift position switch sig-

nal

IG switch ON and shift lever R posi-

tion

10 to 14 V

↑

↑

↑

IG switch ON and shift lever except

R position

Below 1 V

D (E5–21) – E1 (E6–1)

W–R – BR

D shift position switch sig-

nal

IG switch ON and shift lever D and

4 position

10 to 14 V

↑

↑

↑

IG switch ON and shift lever except

D and 4 position

Below 1 V

3 (E5–19) – E1 (E6–1)

L – BR

3 shift position switch sig-

nal

IG switch ON and shift lever 3 posi-

tion

10 to 14 V

↑

↑

↑

IG switch ON and shift lever except

3 position

Below 1 V

ODMS (E4–12) – E1 (E6–1)

L–W – BR

O/D main switch signal

IG switch ON

10 to 14 V

↑

↑

↑

IG switch ON and press continu-

ously O/D main switch

Below 1 V

STP (E4–15) – E1 (E6–1)

G–Y – BR

Stop lamp switch signal

Brake pedal is depressed

7.5 to 14 V

↑

↑

↑

Brake pedal is released

Below 1.5 V

SLU+ (E7–15) – SLU– (E7–14)

P–L – L–W

SLU solenoid signal

5th (lock–up) gear

Pulse generation

(See waveform 2)

S2 (E7–10) – E1 (E6–1)

W–L – BR

S2 solenoid signal

2nd or 3rd gear

10 to 14 V

↑

↑

↑

1st, 4th or 5th gear

Below 1 V

S1 (E7–11) – E1 (E6–1)

R – BR

S1 solenoid signal

1st or 2nd gear

10 to 14 V

↑

↑

↑

3rd, 4th or 5th gear

Below 1 V

D14146

5 V/DIV

1 ms/DIV

GND

D14147

GND

5 V/DIV

1 ms/DIV

DI–560

–

DIAGNOSTICS

AUTOMATIC TRANSMISSION

754

SLT+ (E7–13) – SLT– (E7–12)

B–R – G–Y

SLT solenoid signal

Engine idle speed

Pulse generation

(See waveform 1)

SR (E7–9) – E1 (E6–1)

G–R – BR

SR solenoid signal

5th gear

10 to 14 V

↑

↑

↑

1st gear

Below 1 V

SL2+ (E7–17) – SL2– (E7–16)

GR – LG–B

SL2 solenoid signal

Engine idle speed

Pulse generation

(See waveform 3)

SL1+ (E7–19) – SL1– (E7–18)

R–B – L

SL1 solenoid signal

Engine idle speed

Pulse generation

(See waveform 4)

THO1 (E7–24) – E2 (E8–28)

G – G–W

No.1 ATF temperature

sensor signal

No.1 ATF temperature: 115 

C (239

F) or more

Below 1.5 V

THO2 (E7–32) – E2 (E8–28)

V – G–W

No.2 ATF temperature

sensor signal

No.2 ATF temperature: 115 

C (239

F) or more

Below 1.5 V

SP2+ (E7–34) – SP2– (E7–26)

W–R – Y–R

Speed sensor (SP2) sig-

nal

Vehicle speed 20 km/h (12 mph)

Pulse generation

(See waveform 6)

NT+ (E7–35) – NT– (E7–27)

B – W

Speed sensor (NT) signal

Engine idle speed

Pulse generation

(See waveform 5)

STAR/NSW (E7–8) – E1 (E6–1)

B – BR

Park neutral switch signal

IG switch ON and shift lever P and

N position

Below 2 V

↑

↑

↑

IG switch ON and shift lever except

P and N position

10 to 14 V

L4* (E6–13) – E1 (E6–1)

L–R – BR

Transfer L position switch

signal

IG switch ON and transfer L posi-

tion

Below 1 V

↑

↑

↑

IG switch ON and transfer except L

position

10 to 14 V

HINT:
*: 4WD

Waveform 1

Reference:

Terminal

SLT+ – SLT–

Tool setting

5V/DIV, 1ms/DIV

Vehicle condition

Engine idle speed

Waveform 2

Reference:

Terminal

SLU+ – SLU–

Tool setting

5V/DIV, 1ms/DIV

Vehicle condition

5th (lock–up) or 6th (lock–up) gear

D14146

5 V/DIV

1 ms/DIV

GND

D14146

5 V/DIV

1 ms/DIV

GND

D14148

GND

1 V/DIV

2 ms/DIV

C13480

D14149

GND

2 V/DIV

20 ms/DIV

–

DIAGNOSTICS

AUTOMATIC TRANSMISSION

DI–561

755

Waveform 3

Reference:

Terminal

SL2+ – SL2–

Tool setting

5V/DIV, 1ms/DIV

Vehicle condition

Engine idle speed

Waveform 4

Reference:

Terminal

SL1+ – SL1–

Tool setting

5V/DIV, 1ms/DIV

Vehicle condition

Engine idle speed

Waveform 5

Reference:

Terminal

NT+ – NT–

Tool setting

1V/DIV, 2ms/DIV

Vehicle condition

Engine idle speed (P or N position)

Waveform 6

Reference:

Terminal

SP2+ – SP2–

Tool setting

2V/DIV, 20ms/DIV

Vehicle condition

Vehicle speed 20 km/h (12 mph)

DIDIZ–01

D14150

D13872

DLC3

OBD II Scan Tool
(Hand–held Tester)

CAN VIM

D14151

DLC3

1314 1516

12

11

10

9

1 2 3 4 5 6 7 8

DI–562

–

DIAGNOSTICS

AUTOMATIC TRANSMISSION

756

DIAGNOSIS SYSTEM

DESCRIPTION
When troubleshooting On–Board Diagnostic (OBD II) vehicles,
the vehicle must be connected to the OBD II scan tool (comply-
ing with SAE J1987). Various data output from the vehicle’s
ECM can then be read.

OBD II regulations require that the vehicle’s on–board comput-
er illuminates the Malfunction Indicator Lamp (MIL) on the
instrument panel when the computer detects a malfunction in:
1) The emission control system/components
2) The powertrain control components (which affect vehicle
emissions)
3) The computer
In addition, the applicable Diagnostic Trouble Codes (DTCs)
prescribed by SAE J2012 are recorded in the ECM memory.
If the malfunction does not reoccur in 3 consecutive trips, the
MIL turns off automatically but the DTCs remain recorded in the
ECM memory.

To check DTCs, connect the scan tool to the Data Link Connec-
tor 3 (DLC3) of the vehicle. The scan tool displays DTCs, the
freeze frame data and a variety of the engine data.
The DTCs and freeze frame data can be erased with the scan
tool (See page 

DI–565

).

NORMAL MODE AND CHECK MODE
The diagnosis system operates in ”normal mode” during normal
vehicle use. In normal mode, ”2–trip detection logic” is used to
ensure accurate detection of malfunctions. ”Check mode” is
also available to technicians as an option. In check mode,
”1–trip detection logic” is used for simulating malfunction symp-
toms and increasing the system’s ability to detect malfunctions,
including intermittent malfunctions.
2–TRIP DETECTION LOGIC
When a malfunction is first detected, the malfunction is tempo-
rarily stored in the ECM memory (1st trip). If the ignition switch
is turned OFF and then ON again, and the same malfunction is
detected again, the MIL will illuminate.