Terminals Of ECM

HINT:

The standard normal voltage between each pair of ECM terminals is shown in Fig 2 or Fig 3 . 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 

Airbag sensor assembly

ECM Terminal Names	Between F/PS and E1
Tester Ranges	5 V/DIV, 500 msec./DIV
Conditions	Idling with warm engine

WAVEFORM 2 

Vehicle speed signal

ECM Terminal Names	Between SPD and E1
Tester Ranges	5 V/DIV, 20 msec./DIV
Conditions	Driving at 25 mph (40 km/h)

HINT:

The wavelength becomes shorter as the vehicle speed increases.

WAVEFORM 3 

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 the engine rpm increases.

WAVEFORM 4 

EVAP VSV

ECM Terminal Names	Between PRG and E01
Tester Ranges	5 V/DIV, 50 msec./DIV
Conditions	Idling

HINT:

If the waveform is not similar to the illustration, check the waveform again after idling for 10 minutes or more.

WAVEFORM 5 

Heated Oxygen (HO2) sensor (sensor 1)

ECM Terminal Names	Between OXL1 and E2
Tester Ranges	0.2 V/DIV, 200 msec./DIV
Conditions	Engine maintained at 2,500 rpm when warm

HINT:

In the DATA LIST, item O2S B1S1 shows the ECM input values from the front HO2 sensor (sensor 1).

WAVEFORM 6 

Heated Oxygen (HO2) sensor (sensor 2)

ECM Terminal Names	Between OXL2 and E2
Tester Ranges	0.2 V/DIV, 200 msec./DIV
Conditions	Engine maintained at 2,500 rpm when warm

HINT:

In the DATA LIST, item O2S B1S2 shows the ECM input values from the front HO2 sensor (sensor 2).

WAVEFORM 7 

1. Camshaft position sensor
2. Crankshaft position sensor

HINT:

The wavelength becomes shorter as the engine rpm increases.

WAVEFORM 8 

Fuel injector

ECM Terminal Names	Between #1 (to 4) and E01
Tester Ranges	20 V/DIV, 20 msec./DIV
Conditions	Idling

HINT:

The wavelength becomes shorter as the engine rpm increases.

WAVEFORM 9 

1. Igniter IGT signal (from ECM to igniter)
2. Igniter IGF signal (from igniter to ECM)

HINT:

The wavelength becomes shorter as the engine rpm increases.

WAVEFORM 10 

Camshaft timing oil control valve (OCV)

ECM Terminal Names	Between OCV+ and OCV-
Tester Ranges	5 V/DIV, 200 msec./DIV
Conditions	Idling

HINT:

The wavelength becomes shorter as the engine rpm increases.

WAVEFORM 11 

Knock sensor

ECM Terminal Names	Between KNK1 and E1
Tester Ranges	0.01 to 10 V/Division, 0.01 to 10 msec./Division
Conditions	Engine maintained at 4,000 rpm warm

HINT:

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

WAVEFORM 12 

Terminal SIL of DLC3

ECM Terminal Names	Between SIL and E1
Tester Ranges	5 V/DIV, 1 msec./DIV
Conditions	Connect hand-held tester or OBD II scan tool to DLC3