Terminals Of ECM

Fig 1: Identifying ECM Terminals

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

HINT:

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

The check results should be compared with the standard normal voltage for that pair of terminals, listed in the "Specified Condition" column.

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

1. WAVEFORM 1
   1. Camshaft timing Oil Control Valve (OCV) operation signal
   SIGNAL WAVEFORM REFERENCE 1
   
   

   ECM Terminal Names	Between OC1+ and OC1-, OC2+ and OC2-, OE1 + and OE1-, or OE2+ and OE2-
   Tester Ranges	5 V/DIV, 1 msec./DIV
   Conditions	Idling

   HINT:

   The wavelength becomes shorter as the engine rpm increases.

   Fig 2: OCV Signal Waveform Graph

   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
2. WAVEFORM 2
   1. Heated oxygen sensor signal
   SIGNAL WAVEFORM REFERENCE 2
   
   

   ECM Terminal Names	Between OX1B and E2, or OX2B and E2
   Tester Ranges	0.2 V/DIV, 200 msec./DIV
   Conditions	Engine speed is maintained at 2,500 rpm for 2 minutes after sensor is warmed up

   HINT:

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

   Fig 3: Heated Oxygen Sensor Signal Waveform Graph

   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
3. WAVEFORM 3
   1. Fuel injector operation signal
   SIGNAL WAVEFORM REFERENCE 3
   
   

   ECM Terminal Names	Between #10 (to 60) and E01
   Tester Ranges	30 V/DIV, 20 msec./DIV
   Conditions	Idling

   HINT:

   The wavelength becomes shorter as the engine rpm increases.

   Fig 4: Fuel Injector Signal Waveform Graph

   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
4. WAVEFORM 4
   1. Knock sensor signal
   SIGNAL WAVEFORM REFERENCE 4
   
   

   ECM Terminal Names	Between KNK1 and EKNK, or KNK2 and EKN2
   Tester Ranges	0.01 to 10 V/DIV, 0.01 to 10 msec./DIV
   Conditions	Engine speed is maintained at 4,000 rpm after engine is warmed up

   HINT:

   • The wavelength becomes shorter as the engine rpm increases.
   • The waveforms and amplitudes displayed differ slightly depending on the vehicle.
   Fig 5: Knock Sensor Signal Waveform Graph

   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
5. WAVEFORM 5
   1. Variable Valve Timing (VVT) sensor signal
   2. Crankshaft position sensor signal
   SIGNAL WAVEFORM REFERENCE 5
   
   

   ECM Terminal Names	Between VV1+ and VV1-, VV2+ and VV2-, EV1+ and EV1-, or EV2+ and EV2- Between NE+ and NE-
   Tester Ranges	5 V/DIV, 20 msec./DIV
   Conditions	Idling

   HINT:

   The wavelength becomes shorter as the engine rpm increases.

   Fig 6: VVT And Crankshaft Position Sensors Signal Waveform Graph

   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
6. WAVEFORM 6
   1. Igniter IGT signal (from ECM to igniter)
   2. Igniter IGF signal (from igniter to ECM)
   SIGNAL WAVEFORM REFERENCE 6
   
   

   ECM Terminal Names	Between IGT (1 to 6) and E1 Between IGF1 and E1
   Tester Ranges	2 V/DIV, 20 msec./DIV
   Conditions	Idling

   HINT:

   The wavelength becomes shorter as the engine rpm increases.

   Fig 7: Igniter IGT And IGF Signal Waveform Graph

   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
7. WAVEFORM 7
   1. Purge VSV for EVAP system operation signal
   SIGNAL WAVEFORM REFERENCE 7
   
   

   ECM Terminal Names	Between PRG and E1
   Tester Ranges	10 V/DIV, 50 msec./DIV
   Conditions	Idling

   HINT:

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

   Fig 8: Purge VSV For EVAP System Signal Waveform Graph

   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
8. WAVEFORM 8
   1. Vehicle speed signal
   SIGNAL WAVEFORM REFERENCE 8
   
   

   ECM Terminal Names	Between SPD and E1
   Tester Ranges	2 V/DIV, 20 msec./DIV
   Conditions	Driving at 12 mph (20 km/h)

   HINT:

   • The wavelength becomes shorter as the vehicle speed increases.
   • Depending on the vehicle, the output waveform voltage may rise to 12 V if influenced by optionally installed systems.
   Fig 9: Vehicle Speed Signal Waveform Graph

   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
9. WAVEFORM 9
   1. Throttle drive motor operation signal (positive terminal)
   SIGNAL WAVEFORM REFERENCE 9
   
   

   ECM Terminal Names	Between M+ and ME01
   Tester Ranges	5 V/DIV, 1 msec./DIV
   Conditions	Idling with warm engine

   HINT:

   The duty ratio varies depending on the throttle actuator operation.

   Fig 10: Throttle Drive Motor Signal Waveform Graph (Positive Terminal)

   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
10. WAVEFORM 10
    1. Throttle drive motor operation signal (negative terminal)
    SIGNAL WAVEFORM REFERENCE 10
    
    

    ECM Terminal Names	Between M- and ME01
    Tester Ranges	5 V/DIV, 1 msec./DIV
    Conditions	Idling with warm engine

    HINT:

    The duty ratio varies depending on the throttle actuator operation.

    Fig 11: Throttle Drive Motor Signal Waveform Graph (Negative Terminal)

    Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
11. WAVEFORM 11
    1. Engine speed signal
    SIGNAL WAVEFORM REFERENCE 11
    
    

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

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

    Fig 12: Engine Speed Signal Waveform Graph

    Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
12. WAVEFORM 12
    1. CAN communication signal:
    SIGNAL WAVEFORM REFERENCE 12
    
    

    ECM Terminal Names	Between CANH and E1
    Tester Ranges	1 V/DIV., 10 μsec./DIV.
    Conditions	Engine stops and ignition switch on (IG)

    HINT:

    The waveform varies depending on the CAN communication signal.

    Fig 13: CAN Communication Signal Waveform Graph

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13. WAVEFORM 13
    1. CAN communication signal:
    SIGNAL WAVEFORM REFERENCE 13
    
    

    ECM Terminal Names	Between CANL and E1
    Tester Ranges	1 V/DIV., 10 μsec./DIV.
    Conditions	Engine stops and ignition switch on (IG)

    HINT:

    The waveform varies depending on the CAN communication signal.

    Fig 14: CAN Communication Signal Waveform Graph

    Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.