Toyota Tundra. Manual — part 1487

HINT:

The waveform varies depending on the CAN communication signal.

Fig. 29: Identifying Waveform 13
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

o. WAVEFORM 14:

Crankshaft position sensor and camshaft position sensor

WAVEFORM REFERENCE

HINT:

The wavelength becomes shorter as the engine speed increases.

Fig. 30: Identifying Waveform 14
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

p. WAVEFORM 15:

Terminal DI of air injection control driver

Terminal No. (Symbols)

Tool Setting

Condition

CH1: D74-110 (NE+) - D74-111 (NE-) 5 V/DIV., 20 msec./DIV. Idle after engine warmed up
CH2: D74-90 (G2) - D74-89 (G2-)

5 V/DIV., 20 msec./DIV. Idle after engine warmed up

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

WAVEFORM REFERENCE

Fig. 31: Identifying Waveform 15
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

HINT:

The wavelength changes when the air injection control driver detects malfunctions in the air
injection system (see DTC P0412 SECONDARY AIR INJECTION SYSTEM SWITCHING
VALVE "A" CIRCUIT; DTC P0415 SECONDARY AIR INJECTION SYSTEM
SWITCHING VALVE "B" CIRCUIT ).

q. WAVEFORM 16:

Crankshaft position sensor and VVT sensor for exhaust side

WAVEFORM REFERENCE

HINT:

The wavelength becomes shorter as engine speed increases.

Terminal No.

(Symbols)

Tool Setting

Condition

D74-30 (AIDI) - D74-
81 (E1)

5 V/DIV., 20 to 40
msec./DIV.

Performing system check using Techstream (air
injection check)

D74-29 (AID2) - D74-
81 (E1)

5 V/DIV., 20 to 40
msec./DIV.

Performing system check using or Techstream
(air injection check)

Terminal No. (Symbols)

Tool Setting

Condition

(a) D74-110 (NE+) - D74-111 (NE-) 5 V/DIV., 20 msec./DIV. Idle after engine warmed up
(b) D74-69 (EV1+) - D74-68 (EV1-) 5 V/DIV., 20 msec./DIV. Idle after engine warmed up
(c) D74-64 (EV2+) - D74-65 (EV2-) 5 V/DIV., 20 msec./DIV. Idle after engine warmed up

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

Fig. 32: Identifying Waveform 16
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

DIAGNOSIS SYSTEM

1. DESCRIPTION

When troubleshooting OBD II (On-Board Diagnostics) vehicles, the Techstream (complying with SAE
J1987) must be connected to the DLC3 (Data Link Connector 3) of the vehicle. Various data in the
vehicle's ECM (Engine Control Module) can be then read.

OBD II regulations require that the vehicle's on-board computer illuminate the MIL (Malfunction
Indicator Lamp) on the instrument panel when the computer detects a malfunction in:

a. The emission control systems components.

b. The powertrain control components (which affect vehicle emissions).

c. The computer itself.

Fig. 33: Identifying Malfunction Indicator Lamp
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

In addition, the applicable DTCs prescribed by SAE J2012 are recorded in the ECM memory. If the
malfunction does not recur in 3 consecutive trips, the MIL turns off automatically but the DTCs
remain recorded in the ECM memory.

To check the DTCs, connect the Techstream to the DLC3. The Techstream displays DTCs, freeze
frame data, and a variety of the engine data. The DTCs and freeze frame data can be erased with the

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

Techstream. In order to enhance OBD function on vehicles and develop the Off-Board diagnosis
system, Controller Area Network (CAN) communication is used in this system. CAN is a network
which uses a pair of data transmission lines spanning multiple computers and sensors. It allows for
high speed communications between the systems and simplification of the wire harness
connections.

2. 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 as an
option for technicians. In check mode, 1 trip detection logic is used for simulating malfunction symptoms
and increasing the system's ability to detect malfunctions, including intermittent problems (Techstream
only).

3. TRIP DETECTION LOGIC

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 subsequent drive cycle, the MIL is illuminated (2nd
trip).

4. FREEZE FRAME DATA

The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is
stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was
running or stopped, whether the engine was warmed up or not, whether the air-fuel ratio was lean or rich,
as well as other data recorded at the time of a malfunction.

5. BATTERY VOLTAGE

Standard voltage: 11 to 14 V

If voltage is below 11V, replace or recharge the battery before proceeding.

6. MIL (Malfunction Indicator Lamp)

a. The MIL is illuminated when the ignition switch is first turned ON (the engine is not running).

b. The MIL should turn OFF when the engine is started. If the MIL remains illuminated, the diagnosis

system has detected a malfunction or abnormality in the system.

HINT:

If the MIL is not illuminated when the ignition switch is first turned ON, check the MIL
CIRCUIT .

7. ALL READINESS

HINT:

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra