Terminals Of ECM

HINT:

The standard normal voltage between each pair of ECM terminals is shown in the table below. The appropriate conditions for checking each pair of terminals is also indicated.

The result of checks should be compared with the standard normal voltage for that pair of terminals, displayed in the STD Voltage column.

The illustration above can be used as a reference to identify the ECM terminal locations.

WAVEFORM 1 

Fuel injector

ECM Terminal Names	Between #10 (to 40) and E01
Tester Ranges	20V/DIV, 20 msec./DIV
Conditions	Idling

HINT:

The wavelength becomes shorter as the engine rpm increases.

WAVEFORM 2 

Knock sensor

HINT:

• The wavelength becomes shorter as the engine rpm increases.
• The waveforms and amplitudes displayed differ slightly depending on the vehicle.

WAVEFORM 3 

VVT OCV

HINT:

In the DATA LIST, the items VVT OCV DUTY B1 and B2 show the duty ratio of voltage flowing to the OCV (see illustration on left).

VVT OCV DUTY B1, B2 = A/B x 100 (%)

WAVEFORM 4 

1. VVT sensor bank 1
2. VVT sensor bank 2
3. Crankshaft position sensor
   Fig 10: VVT Sensor Bank & Crankshaft Position Sensor Chart

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   Fig 11: Identifying Waveform 4

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

The wavelength becomes shorter as the engine rpm increases.

WAVEFORM 5 

1. Camshaft position sensor
2. Crankshaft position sensor
   CAMSHAFT/CRANKSHAFT POSITION SENSOR
   
   

   ECM Terminal Name	Between G2+ and G2-
   Tester Range	2 V/DIV, 200 msec./DIV
   Condition	Idle after engine warmed-up

   Fig 12: Identifying Waveform 5

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   HINT:

   The wavelength becomes shorter as the engine rpm increases.

WAVEFORM 6 

Vehicle speed signal

ECM Terminal Name	Between SP2+ and SP2-
Tester Range	5 V/DIV, 10 msec./DIV
Condition	Driving by 40 km/h (25 mph)

HINT:

The wavelength becomes shorter as vehicle speed increases.

WAVEFORM 7 

Throttle actuator positive terminal

ECM Terminal Name	Between M+ and ME01
Tester Range	5 V/DIV, 1 msec./DIV
Condition	Idle after engine warmed-up

HINT:

The duty ratio varies depending on the throttle opening operation.

WAVEFORM 8 

Throttle actuator negative terminal

ECM Terminal Name	Between M- and ME01
Tester Range	5 V/DIV, 1 msec./DIV
Condition	Idle after engine warmed-up

HINT:

The duty ratio varies depending on the throttle opening operation.

WAVEFORM 9 

1. Igniter IGT signal (from ECM to igniter)
2. Igniter IGF signal (from igniter to ECM)
   Fig 16: Igniter IGT Signal & Igniter IGF Signal Chart

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   Fig 17: Identifying Waveform 9

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   HINT:

   The wavelength becomes shorter as vehicle speed increases.

WAVEFORM 10 

Heated oxygen sensor

ECM Terminal Names	Between OX1B and E2
Tester Ranges	0.2 V/DIV, 200 msec./DIV
Conditions	Engine speed maintained 2,500 rpm for 2 minutes after warming up sensor

HINT:

In the DATA LIST, item O2S B1S2 shows the ECM input values from the heated oxygen sensor.

WAVEFORM 11 

Engine speed signal

ECM Terminal Names	Between TACH and E1
Tester Ranges	5 V/DIV, 10 msec./DIV
Conditions	Idling

HINT:

The wavelength becomes shorter as vehicle speed increases.