Terminals Of ECM

Fig 1: Identifying ECM Connector Terminals

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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 are also indicated. The result of checks should be compared with the standard normal voltage for that pair of terminals, displayed in the Specified Condition column. The illustration above can be used as a reference to identify the ECM terminal locations.

1. WAVEFORM 1 

   Fuel injector 

   WAVEFORM REFERENCE (WAVEFORM 1)
   
   

   ECM Terminal Names	Between #10 (to #80) and E01
   Tester Range	20 V/DIV., 20 msec./DIV.
   Condition	Idling

   HINT:

   The wavelength becomes shorter as engine rpm increases.

   Fig 2: Waveform Graph (Waveform 1)

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2. WAVEFORM 2 

   Knock sensor 

   WAVEFORM REFERENCE (WAVEFORM 2)
   
   

   ECM Terminal Name	Between KNK1 and EKNK Between KNK2 and EKN2
   Tester Range	1 V/DIV, 1 msec./DIV.
   Condition	Maintain engine RPM at 2,000 rpm after engine warmed-up

   HINT:

   • The wavelength becomes shorter as engine rpm increases.
   • The waveforms and amplitudes displayed differ slightly depending on the vehicle.
     Fig 3: Waveform Graph (Waveform 2)

     Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. WAVEFORM 3 

   Camshaft timing oil control valve (OCV) 

   WAVEFORM REFERENCE (WAVEFORM 3)
   
   

   ECM Terminal Name	Between OC1+ and OC1- Between OC2+ and OC2-
   Tester Range	5 V/DIV., 200 msec./DIV.
   Condition	Accelerate slowly after engine warmed-up

   HINT:

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

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

   Fig 4: Waveform Graph (Waveform 3)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. WAVEFORM 4 

   Variable Valve Timing (VVT) sensor (bank 1, 2) and Crankshaft position sensor 

   WAVEFORM REFERENCE (WAVEFORM 4)
   
   

   ECM Terminal Name	CH1: Between VV1+ and VV1- CH2: Between VV2+ and VV2- CH3: Between NE+ and NE-
   Tester Range	2 V/DIV., 20 msec./DIV.
   Condition	Idle after engine warmed-up

   HINT:

   The wavelength becomes shorter as engine rpm increases.

   Fig 5: Waveform Graph (Waveform 4)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. WAVEFORM 5 

   Camshaft position sensor 

   WAVEFORM REFERENCE (WAVEFORM 5)
   
   

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

   HINT:

   • The wavelength becomes shorter as engine rpm increases.
   • *1: Crank angle
   • *2: 180°
   • *3: 120°
   • *4: 60°
     Fig 6: Waveform Graph (Waveform 5)

     Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
6. WAVEFORM 6 

   Vehicle speed signal 

   WAVEFORM REFERENCE (WAVEFORM 6)
   
   

   ECM Terminal Name	Between SPD and E1
   Tester Range	5 V/DIV, 20 msec./DIV.
   Condition	Driving by 40 km/h (25 mph)

   HINT:

   The wavelength becomes shorter as engine rpm increases.

   Fig 7: Waveform Graph (Waveform 6)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
7. WAVEFORM 7 

   Throttle actuator positive terminal 

   WAVEFORM REFERENCE (WAVEFORM 7)
   
   

   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.

   Fig 8: Waveform Graph (Waveform 7)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
8. WAVEFORM 8 

   Throttle actuator negative terminal 

   WAVEFORM REFERENCE (WAVEFORM 8)
   
   

   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.

   Fig 9: Waveform Graph (Waveform 8)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
9. WAVEFORM 9 

   Igniter IGT signal (from ECM to igniter) and Igniter IGF signal (from igniter to ECM) 

   WAVEFORM REFERENCE (WAVEFORM 9)
   
   

   ECM Terminal Name	Between IGT1 (to IGT8) and E1 Between IGF1 (IGF2) and E1
   Tester Range	2 V/DIV., 20 msec./DIV.
   Condition	Idling

   HINT:

   The wavelength becomes shorter as engine rpm increases.

   Fig 10: Waveform Graph (Waveform 9)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
10. WAVEFORM 10 

    Heated oxygen (HO2) sensor 

    WAVEFORM REFERENCE (WAVEFORM 10)
    
    

    ECM Terminal Names	Between OX1B (OX2B) 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.

    Fig 11: Waveform Graph (Waveform 10)

    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
11. WAVEFORM 11 

    Engine speed signal 

    WAVEFORM REFERENCE (WAVEFORM 11)
    
    

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

    HINT:

    The wavelength becomes shorter as engine rpm increases.

    Fig 12: Waveform Graph (Waveform 11)

    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
12. WAVEFORM 12 

    Air fuel ratio (A/F) sensor heater signal 

    WAVEFORM REFERENCE (WAVEFORM 12)
    
    

    ECM Terminal Names	Between HA1A and E04 Between HA2A and E04
    Tester Range	5 V/DIV., 10 msec./DIV.
    Condition	Idling

    Fig 13: Waveform Graph (Waveform 12)

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13. WAVEFORM 13 

    Purge VSV 

    WAVEFORM REFERENCE (WAVEFORM 13)
    
    

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

    HINT:

    The wavelength becomes shorter as vehicle speed increases.

    Fig 14: Waveform Graph (Waveform 13)

    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
14. WAVEFORM 14 

    CAN communication signal 

    WAVEFORM REFERENCE (WAVEFORM 14)
    
    

    ECM Terminal Names	Between CANH and E1
    Tester Range	1 V/DIV, 10 μsec./DIV.
    Condition	Stop engine and ignition switch ON

    HINT:

    The waveform varies depending on the CAN communication signal.

    Fig 15: Waveform Graph (Waveform 14)

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15. WAVEFORM 15 

    CAN communication signal 

    WAVEFORM REFERENCE (WAVEFORM 15)
    
    

    ECM Terminal Names	Between CANL and E1
    Tester Range	1 V/DIV, 10 μsec./DIV.
    Condition	Stop engine and ignition switch ON

    HINT:

    The waveform varies depending on the CAN communication signal.

    Fig 16: Waveform Graph (Waveform 15)

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16. WAVEFORM 16 

    Terminal PI of air injection control driver 

    WAVEFORM REFERENCE (WAVEFORM 16)
    
    

    ECM Terminal Names	Between AIDI and E1
    Tool setting	5 V/DIV, 20 to 40 msec./DIV
    Condition	Performing ACTIVE TEST using intelligent tester (air injection control system)

    Fig 17: Waveform Graph (Waveform 16)

    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    The wavelength changes when the air injection control driver detects malfunctions in the air injection system (see DTC P0412 Secondary Air Injection System Switching Valve "A" Circuit  ).