Terminals Of ECM

HINT:

Each ECM terminal's standard voltage is shown in the table below.

In the table, first follow the information under "Condition". Look under "Symbols (Terminal No.)" for the terminals to be inspected. The standard voltage between the terminals is shown under "Specified Condition".

Use the illustration above as a reference for the ECM terminals.

WAVEFORM 1 

1. Throttle actuator positive terminal
Fig 5: Identifying Waveform 1 Pattern
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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 2 

1. Throttle actuator negative terminal
   Fig 6: Identifying Waveform 2 Pattern

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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 3 

1. Camshaft position sensor
2. Crankshaft position sensor
Fig 7: Identifying Waveform 3 Pattern
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

The wavelength becomes shorter as engine RPM increases.

WAVEFORM 4 

1. VVT sensor bank 1
2. VVT sensor bank 2
3. Crankshaft position sensor
Fig 9: Identifying Waveform 4 Pattern
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

The wavelength becomes shorter as engine RPM increases.

WAVEFORM 5 

1. Vehicle speed signal
   Fig 11: Identifying Waveform 5 Pattern

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

ECM Terminal Name	Between SP2+ and SP2-
Tester Range	1 V/DIV, 10 msec./DIV
Condition	Driving by 40 km/h (25 mph)

HINT:

The wavelength becomes shorter as vehicle speed increases.

WAVEFORM 6 

1. Igniter IGT signal (from ECM to igniter)
2. Igniter IGF signal (from igniter to ECM)
Fig 12: Identifying Waveform 6 Pattern
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

The wavelength becomes shorter as engine RPM increases.

WAVEFORM 7 

1. Fuel injector
   Fig 14: Identifying Waveform 7 Pattern

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

ECM Terminal Name	Between #10 (to 80) and E1
Tester Range	20 V/DIV, 20 msec./DIV
Condition	Idling

HINT:

The wavelength becomes shorter as engine RPM increases.

WAVEFORM 8 

1. EVAP VSV
Fig 15: Identifying Waveform 8 Pattern
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

ECM Terminal Name	Between PRG and E1
Tester Range	5 V/DIV, 50 msec./DIV
Condition	Accelerated slowly after engine warmed-up

HINT:

In cases where the EVAP VSV can be used to purge EVAP, the waveform will not be displayed as shown on the left. In the DATA LIST, the item EVAP PURGE VSV shows the duty ratio of voltage flowing to the purge valve.

Duty ratio for EVAP VSV (%) = A/B x 100

WAVEFORM 9 

1. VVT OCV
Fig 16: Identifying Waveform 9 Pattern
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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 ).

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

WAVEFORM 10 

1. HO2S (sensor 1)
   Fig 18: Identifying Waveform 10 Pattern

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   Fig 19: Waveform 10 Reference Chart

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   HINT:

   In the DATA LIST, the items HO2S B1 S1 and HO2S B2 S1 show the ECM input values of the HO2S (sensor 1).

   WAVEFORM 11 

   1. HO2S (sensor 2)
   Fig 20: Identifying Waveform 11 Pattern
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   Fig 21: Waveform 11 Reference Chart

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   HINT:

   In the DATA LIST, the items HO2S B1 S2 and HO2S B2 S2 show the ECM input values of the rear HO2S (sensor 2).

   WAVEFORM 12 

   1. Knock sensor
   Fig 22: Identifying Waveform 12 Pattern
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   Fig 23: Waveform 12 Reference Chart

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   HINT:

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

   WAVEFORM 13 

   1. Cooling fan
   Fig 24: Identifying Waveform 13 Pattern
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   WAVEFORM 13 REFERENCE TABLE
   
   

   ECM Terminal Name	Between RFC and E1
   Tester Range	1 V/DIV, 20 msec./DIV
   Condition	Idling and A/C: ON

   HINT:

   The duty ratio (labeled A and B in the illustration) changes depending on the engine coolant temperature.