Terminals Of ECM

Fig 1: Identifying ECM Connector Terminals

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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 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 

   Camshaft timing oil control valve (OCV): 

   WAVEFORM REFERENCE (WAVEFORM 1)
   
   

   ECM Terminal Name	Between OC1+ and OC1- or OC2+ and OC2- Between OE1+ and OE1- or OE2+ and OE2-
   Tester Range	5 V/DIV, 1 ms./DIV
   Condition	Idling

   Fig 2: Waveform Graph (Waveform 1)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   HINT:

   The wavelength becomes shorter as the engine rpm increases.

2. WAVEFORM 2 

   Heated oxygen sensor: 

   WAVEFORM REFERENCE (WAVEFORM 2)
   
   

   ECM Terminal Name	Between OX1B and O1B- or OX2B and O2B-
   Tester Range	0.2 V/DIV, 200 ms./DIV
   Condition	Engine speed maintained at 2,500 rpm for 2 minutes after warming up engine

   Fig 3: Waveform Graph (Waveform 2)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   HINT:

   In DATA LIST, item O2S B1 S2 shows the ECM input values from the heated oxygen sensor.

3. WAVEFORM 3 

   Injector No. 1 (to No. 6) injection signal: 

   WAVEFORM REFERENCE (WAVEFORM 3)
   
   

   ECM Terminal Name	Between #10 (to #60) and E1
   Tester Range	2 V/DIV, 20 ms./DIV
   Condition	Idling

   Fig 4: Waveform Graph (Waveform 3)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   HINT:

   The wavelength becomes shorter as the engine rpm increases.

4. WAVEFORM 4 

   Knock sensor: 

   WAVEFORM REFERENCE (WAVEFORM 4)
   
   

   ECM Terminal Name	Between KNK1 and EKNK1 Between KNK2 and EKNK2
   Tester Range	0.01 to 10 V/DIV, 0.01 to 10 ms./DIV
   Condition	Engine speed maintained at 4,000 rpm after warming up engine

   Fig 5: Waveform Graph (Waveform 4)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   HINT:

   • The wavelength becomes shorter as the engine rpm increases.
   • The waveforms and amplitudes displayed differ slightly depending on the vehicle.
5. WAVEFORM 5 

   Crankshaft position sensor and VVT sensor for intake camshaft: 

   WAVEFORM REFERENCE (WAVEFORM 5)
   
   

   ECM Terminal Name	Between NE+ and NE- Between VV1 + and VV1 - or VV2+ and VV2-
   Tester Range	5 V/DIV, 20 ms./DIV
   Condition	Idling

   Fig 6: Waveform Graph (Waveform 5)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   HINT:

   The wavelength becomes shorter as the engine rpm increases.

6. WAVEFORM 6 

   Crankshaft position sensor and VVT sensor for exhaust camshaft: 

   WAVEFORM REFERENCE (WAVEFORM 6)
   
   

   ECM Terminal Name	Between NE+ and NE- Between EV1+ and EV1- or EV2+ and EV2-
   Tester Range	5 V/DIV, 20 ms./DIV
   Condition	Idling

   Fig 7: Waveform Graph (Waveform 6)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   HINT:

   The wavelength becomes shorter as the engine rpm increases.

7. WAVEFORM 7 

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

   WAVEFORM REFERENCE (WAVEFORM 7)
   
   

   ECM Terminal Name	Between IGT (1 to 6) and E1 Between IGF1 and E1 or IGF2 and E1
   Tester Range	2 V/DIV, 20 ms./DIV
   Condition	Idling

   Fig 8: Waveform Graph (Waveform 7)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   HINT:

   The wavelength becomes shorter as the engine rpm increases.

8. WAVEFORM 8 

   EVAP VSV: 

   WAVEFORM REFERENCE (WAVEFORM 8)
   
   

   ECM Terminal Name	Between PRG and E1
   Tester Range	5 V/DIV, 50 ms./DIV
   Condition	Idling

   Fig 9: Waveform Graph (Waveform 8)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   HINT:

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

9. WAVEFORM 9 

   Vehicle speed signal: 

   WAVEFORM REFERENCE (WAVEFORM 9)
   
   

   ECM Terminal Name	Between SPD and E1
   Tester Range	5 V/DIV, 20 ms./DIV
   Condition	Driving at 12 mph (20 km/h)

   Fig 10: Waveform Graph (Waveform 9)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   HINT:

   The wavelength becomes shorter as the vehicle speed increases.

10. WAVEFORM 10 

    Throttle actuator positive terminal: 

    WAVEFORM REFERENCE (WAVEFORM 10)
    
    

    ECM Terminal Name	Between M+ and ME01
    Tester Range	5 V/DIV, 1 ms./DIV
    Condition	Idling with warm engine

    Fig 11: Waveform Graph (Waveform 10)

    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    The duty ratio varies depending on the throttle actuator operation.

11. WAVEFORM 11 

    Throttle actuator negative terminal: 

    WAVEFORM REFERENCE (WAVEFORM 11)
    
    

    ECM Terminal Name	Between M- and ME01
    Tester Range	5 V/DIV, 1 ms./DIV
    Condition	Idling with warm engine

    Fig 12: Waveform Graph (Waveform 11)

    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    The duty ratio varies depending on the throttle actuator operation.

12. WAVEFORM 12 

    Engine speed signal: 

    WAVEFORM REFERENCE (WAVEFORM 12)
    
    

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

    Fig 13: Waveform Graph (Waveform 12)

    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

13. WAVEFORM 13 

    Injector No. 1 (to No. 6) injection signal and Injection confirmation signal: 

    WAVEFORM REFERENCE (WAVEFORM 13)
    
    

    ECM Terminal Name	CH1: Between #10 (to #60) and E1 CH2: Between INJF and E1
    Tester Range	2 V/DIV, 20 ms./DIV
    Condition	Idling with warm engine

    Fig 14: Waveform Graph (Waveform 13)

    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

14. WAVEFORM 14 

    High pressure side fuel pump (Spill valve): 

    WAVEFORM REFERENCE (WAVEFORM 14)
    
    

    ECM Terminal Name	CH1: Between FPD and E1 CH2: Between FPF1 and E1
    Tester Range	2 V/DIV, 5 ms./DIV
    Condition	Idling with warm engine

    Fig 15: Waveform Graph (Waveform 14)

    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
15. WAVEFORM 15 

    DC motor for SCV positive terminal: 

    WAVEFORM REFERENCE (WAVEFORM 15)
    
    

    ECM Terminal Name	Between IA1+ and E01
    Tester Range	5 V/DIV, 1 ms./DIV
    Condition	Idling with warm engine

    Fig 16: Waveform Graph (Waveform 15)

    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
16. WAVEFORM 16 

    DC motor for SCV negative terminal: 

    WAVEFORM REFERENCE (WAVEFORM 16)
    
    

    ECM Terminal Name	Between IA1- and E01
    Tester Range	5 V/DIV, 1 ms./DIV
    Condition	Idling with warm engine

    Fig 17: Waveform Graph (Waveform 16)

    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
17. WAVEFORM 17 

    CAN communication signal: 

    WAVEFORM REFERENCE (WAVEFORM 17)
    
    

    ECM Terminal Name	Between CANH and E1
    Tester Range	1 V/DIV, 10 μs/DIV
    Condition	Stop engine and engine switch on (IG)

    Fig 18: Waveform Graph (Waveform 17)

    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    The waveform varies depending on the CAN communication signal.

18. WAVEFORM 18 

    CAN communication signal: 

    WAVEFORM REFERENCE (WAVEFORM 18)
    
    

    ECM Terminal Name	Between CANL and E1
    Tester Range	1 V/DIV, 10 μs/DIV
    Condition	Stop engine and engine switch on (IG)

    Fig 19: Waveform Graph (Waveform 18)

    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    The waveform varies depending on the CAN communication signal.