Toyota Tundra. Manual — part 1132

D74-81 (E1)

LG - BR Stop light switch

Brake pedal released

Below 1.5 V

A24-35 (ST1-) -
D74-81 (E1)

R - BR

Stop light switch (opposite
to STP terminal)

Ignition switch ON, Brake
pedal depressed

Below 1.5 V

Ignition switch ON, Brake

pedal released

7.5 to 14 V

D74-120 (NSW)
- D74-81 (E1)

L - BR Park/Neutral position switch

Ignition switch ON, Shift
lever position in P or N

Below 3.0 V

Ignition switch ON, Shift

lever position other than P

and N

11 to 14 V

D74-19 (M+) -
D74-82 (ME01)

R - W-B Throttle actuator

Idling with warm engine

Pulse generation

(See 9waveform 9)

D74-18 (M-) -
D74-82(ME01)

G - W-B Throttle actuator

Idling with warm engine

Pulse generation

(See 10waveform

10)

A24-48(FC) -
D74-81(E1)

L - BR Fuel pump control

Ignition switch ON

11 to 14 V

A24-24 (W) -
D74-81 (E1)

P - BR MIL

Ignition switch ON

Below 3.0 V

Idling

11 to 14 V

A24-16 (TC) -
D74-81 (E1)

R - BR Terminal TC of DLC3

Ignition switch ON

11 to 14 V

A24-15 (TACH)
- D74-81 (E1)

W - BR Engine speed

Idling

Pulse generation

(See 11waveform

11)

D74-62 (ACIS) -
D74-81 (E1)

R-W -

BR

VSV for ACIS

Ignition switch ON

11 to 14 V

D74-72 (PSW) -
D74-81 (E1)

L - BR P/S pressure switch

Ignition switch ON

11 to 14 V

A24-30 (VPMP)
- D74-81 (E1)

V - BR

Vent valve (built into
canister pump module)

Ignition switch ON

11 to 14 V

A24-49 (MPMP)
- D74-81 (E1)

G - BR

Leak detection pump (built
into canister pump module)

Leak detection pump OFF

0 to 3 V

Leak detection pump ON 11 to 14 V

D74-121
(PPMP) - D74-
97 (ETHW)

P - BR

Canister pressure sensor
(built into canister pump
module)

Ignition switch ON

3 to 3.6 V

D74-28 (AIRV)
- D74-81 (E1)

BR - BR

Air switching valve (bank 1)
for secondary air injection
system

Idling

11 to 14 V

A24-43 (ARV2)
- D74-81 (E1)

V - BR

Air switching valve (bank 2)
for secondary air injection
system

Idling

11 to 14 V

D74-54 (AIRP) -
D74-81 (E1)

P - BR Air pump (bank 1) control

Idling

11 to 14 V

D74-53 (ARP2)

P-L - BR Air pump (bank 2) control

Idling

11 to 14 V

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra

1. WAVEFORM 1

Camshaft timing oil control valve (OCV)

WAVEFORM REFERENCE 1

- D74-81 (E1)

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

G - BR

Diagnostic information
signal for air injection
system

Air injection system
operates

Pulse generation

(See 14waveform

14)

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

G - BR

Diagnostic information
signal for air injection
system

Air injection system
operates

Pulse generation

(See 14waveform

14)

A24-54 (AIP) -
D74-98 (ETHA)

Y - BR

Secondary air injection
system pressure signal

Ignition switch ON

4.5 to 5.0 V

A24-53 (AIP2) -
D74-98 (ETHA)

G - BR

Secondary air injection
system pressure signal

Ignition switch ON

4.5 to 5.0 V

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

GR - BR CAN communication line

Ignition switch ON

Pulse generation

(See 12waveform

12)

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

W - BR CAN communication line

Ignition switch ON

Pulse generation

(See 13waveform

13)

A24-52 (FPC) -
D74-81 (E1)

O - BR Fuel pump control

Ignition switch ON

11 to 14 V

A24-18 (DI) -
D74-81 (E1)

L - BR Fuel pump control

Ignition switch ON

0 to 3.0 V

A24-14 (STSW)
- D74-81 (E1)

BR - BR Ignition switch signal

Shift lever position P or N,
ignition switch START

6.0 V or more

A24-41 (ACCR)
- D74-81 (E1)

BR - BR

ACC (Accessory) relay
control signal

Cranking

Below 1.5 V

D74-16 (STAR)
- D74-81 (E1)

L - BR Starter relay control

Ignition switch ON

Below 1.5 V

Cranking

6.0 V or more

(1)

The ECM terminal voltage is constant regardless of the output voltage from the sensor.

ECM Terminal Name Between OC1+ and OC1- or OC2+ and OC2-

Tester Range

5 V/DIV., 1 msec./DIV.,

Condition

Idling

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra

Fig. 17: Identifying Waveform 1 Reference

2. WAVEFORM 2

Heated oxygen sensor

WAVEFORM REFERENCE 2

HINT:

In the Data List, item O2S B1S2 or O2S B2S2 shows the ECM input values from the heated oxygen
sensor.

Fig. 18: Identifying Waveform 2 Reference

3. WAVEFORM 3

Fuel injector

WAVEFORM REFERENCE 3

ECM Terminal Name Between OX1B and E2 or OX2B and E2

Tester Range

0.2 V/DIV., 200 msec./DIV.

Condition

Engine speed maintained at 2500 RPM for 2 minutes after warming up engine

ECM Terminal Name Between #10 (to 60) and E01

Tester Range

30 V/DIV., 20 msec./DIV.

Condition

Idling

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra

HINT:

The wavelength becomes shorter as the engine RPM increases.

Fig. 19: Identifying Waveform 3 Reference

4. WAVEFORM 4

Knock sensor

WAVEFORM REFERENCE 4

HINT:



The wavelength becomes shorter as the engine RPM increases.



The waveforms and amplitudes displayed on the Techstream differ slightly depending on the
vehicle.

Fig. 20: Identifying Waveform 4 Reference

5. WAVEFORM 5

a. Crankshaft position sensor

b. VVT sensor

ECM Terminal Name Between KNK1 and EKNK or KNK2 and EKN2

Tester Range

1 V/DIV., 0.01 to 1 msec./DIV.

Condition

Engine speed maintained at 4000 RPM after warming up engine

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra