Toyota Tundra. Manual — part 2793

Fig. 12: Identifying Waveform 3
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

d. Using an oscilloscope, check waveform 4.

Reference:

WAVEFORM REFERENCE TABLE

Fig. 13: Identifying Waveform 4
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

e. Using an oscilloscope, check waveform 5.

Reference:

WAVEFORM REFERENCE TABLE

Terminal No.

(Symbol)

Tool Setting

Condition

D74-10 (SLU+) -
D74-11 (SLU-)

5 V/DIV., 1

msec./DIV.

5th (lock-up)

Terminal No. (Symbol)

Tool Setting

Condition

D74-101 (SP2+) - D74-100 (SP2-) 2 V/DIV., 20 msec./DIV. Vehicle speed 20 km/h (12 MPH)

2009 Toyota Tundra

2009 TRANSMISSION AB60F Automatic Transaxle - Tundra

Fig. 14: Identifying Waveform 5
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

f. Using an oscilloscope, check waveform 6.

Reference:

WAVEFORM REFERENCE TABLE

Fig. 15: Identifying Waveform 6
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

g. Using an oscilloscope, check waveform 7.

Reference:

WAVEFORM REFERENCE TABLE

Terminal No. (Symbol)

Tool Setting

Condition

D74-124 (NT+) - D74-123 (NT-) 1 V/DIV., 2 msec./DIV. Engine is idling (P or N position)

Terminal No.

(Symbol)

Tool Setting

Condition

A24-10 (CANH) -
D74-81 (E1)

1 V/DIV., 10

µsec./DIV.

Ignition switch ON

2009 Toyota Tundra

2009 TRANSMISSION AB60F Automatic Transaxle - Tundra

Fig. 16: Identifying Waveform 7
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

h. Using an oscilloscope, check waveform 8.

Reference:

WAVEFORM REFERENCE TABLE

Fig. 17: Identifying Waveform 8
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

DIAGNOSIS SYSTEM

1. DESCRIPTION

a. When troubleshooting On-Board Diagnostic (OBD II) vehicles, the vehicle must be connected to

the OBD II scan tool (complying with SAE J1987). Various data output from the vehicle's ECM
can then be read.

b. OBD II regulations require that the vehicle's onboard computer illuminate 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)

Terminal No.

(Symbol)

Tool Setting

Condition

A24-11 (CANL) -
D74-81 (E1)

1 V/DIV., 10

µsec./DIV.

Ignition switch ON

2009 Toyota Tundra

2009 TRANSMISSION AB60F Automatic Transaxle - Tundra

3. The computer

Fig. 18: Identifying Malfunction Indicator Lamp (MIL)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

In addition, the applicable Diagnostic Trouble Codes (DTCs) prescribed by SAE J2012 are
recorded in the ECM memory. When the malfunction does not reoccur, the MIL stays
illuminated until the ignition switch is turned off, and the MIL turns off when the engine is
started. However, the DTCs remain recorded in the ECM memory.

c. To check DTCs, connect the Techstream to the Data Link Connector 3 (DLC3) of the vehicle. The

Techstream displays DTCs, the freeze frame data and a variety of the engine data.

The DTCs and freeze frame data can be erased with the Techstream (see DTC CHECK/CLEAR ).

2. NORMAL MODE AND CHECK MODE

a. 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 symptoms and increasing the system's ability to detect malfunctions, including
intermittent malfunctions.

3. 2 TRIP DETECTION LOGIC

a. When a malfunction is first detected, the malfunction is temporarily stored in the ECM memory

(1st trip). If the same malfunction is detected during the next drive cycle, the MIL is illuminated
(2nd trip).

4. FREEZE FRAME DATA

a. Freeze frame data records the engine conditions (fuel system, calculated load, engine coolant

temperature, fuel trim, engine speed, vehicle speed, etc.) when a malfunction is detected. When
troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the
engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the
malfunction occurred.

b. The ECM records freeze frame data at 5 different times: 1) 3 times before the DTC is set, 2) once

when the DTC is set, and 3) once after the DTC is set. These data can be used to simulate the
vehicle's condition around the time when the malfunction occurred. The data may help find the
cause of the malfunction, or judge if the DTC is being caused by a temporary malfunction or not.

2009 Toyota Tundra

2009 TRANSMISSION AB60F Automatic Transaxle - Tundra