Terminals Of ECM

Fig 1: Identifying Terminals Of ECM

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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 CHART 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 msec./DIV.
   Condition	Idling

   HINT:

   The wavelength becomes shorter as the engine rpm increases.

   Fig 2: Camshaft Timing Oil Control Valve - Waveform Reference 1

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. WAVEFORM 2 

   Heated oxygen sensor: 

   WAVEFORM REFERENCE CHART 2
   
   

   ECM Terminal Name	Between OX1B and O1B- or OX2B and O2B-
   Tester Range	0.2 V/DIV., 200 msec./DIV.
   Condition	Engine speed maintained at 2500 rpm for 2 minutes after warming up engine

   HINT:

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

   Fig 3: Heated Oxygen Sensor - Waveform Reference 2

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

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

   WAVEFORM REFERENCE CHART 3
   
   

   ECM Terminal Name	Between #1D (to #6D) and E1
   Tester Range	2 V/DIV., 20 msec./DIV.
   Condition	Idling

   HINT:

   The wavelength becomes shorter as the engine rpm increases.

   Fig 4: Injector For Direct Injection No. 1 (To No. 6) Injection Signal - Waveform Reference 3

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

   Knock sensor: 

   WAVEFORM REFERENCE CHART 4
   
   

   ECM Terminal Name	Between KNK1 and EKNK Between KNK2 and EKN2
   Tester Range	0.01 to 10 V/DIV, 0.01 to 10 msec./DIV.
   Condition	Engine speed maintained at 4000 rpm after warming up engine

   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 - Waveform Reference 4

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

   Crankshaft position sensor and VVT sensor for intake side: 

   WAVEFORM REFERENCE CHART 5
   
   

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

   HINT:

   The wavelength becomes shorter as the engine rpm increases.

   Fig 6: Crankshaft Position Sensor And VVT Sensor For Intake Side - Waveform Reference 5

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

   Crankshaft position sensor and VVT sensor for exhaust side: 

   WAVEFORM REFERENCE CHART 6
   
   

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

   HINT:

   The wavelength becomes shorter as the engine rpm increases.

   Fig 7: Crankshaft Position Sensor And VVT Sensor For Exhaust Side - Waveform Reference 6

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

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

   WAVEFORM REFERENCE CHART 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 msec./DIV.
   Condition	Idling

   HINT:

   The wavelength becomes shorter as the engine rpm increases.

   Fig 8: Igniter IGT Signal And Igniter IGF Signal - Waveform Reference 7

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

   Purge VSV: 

   WAVEFORM REFERENCE CHART 8
   
   

   ECM Terminal Name	Between PRG and E1
   Tester Range	10 V/DIV., 20 msec./DIV.
   Condition	Idling

   HINT:

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

   Fig 9: Purge VSV - Waveform Reference 8

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

   Vehicle speed signal: 

   WAVEFORM REFERENCE CHART 9
   
   

   ECM Terminal Name	Between SPD and E1
   Tester Range	2 V/DIV., 20 msec./DIV.
   Condition	Driving at 12 mph (20 km/h)

   HINT:

   The wavelength becomes shorter as the vehicle speed increases.

   Fig 10: Vehicle Speed Signal - Waveform Reference 9

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

    Throttle actuator positive terminal: 

    WAVEFORM REFERENCE CHART 10
    
    

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

    HINT:

    The duty ratio varies depending on the throttle actuator operation.

    Fig 11: Throttle Actuator Positive Terminal - Waveform Reference 10

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

    Throttle actuator negative terminal: 

    WAVEFORM REFERENCE CHART 11
    
    

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

    HINT:

    The duty ratio varies depending on the throttle actuator operation.

    Fig 12: Throttle Actuator Negative Terminal - Waveform Reference 11

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

    Engine speed signal: 

    WAVEFORM REFERENCE CHART 12
    
    

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

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

    Fig 13: Engine Speed Signal - Waveform Reference 12

    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
13. WAVEFORM 13 

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

    WAVEFORM REFERENCE CHART 13
    
    

    ECM Terminal Name	CH1: Between #1D or #4D and E1 CH2: Between IJF1 and E1
    	CH1: Between #2D or #5D and E1 CH2: Between IJF2 and E1
    	CH1: Between #3D or #6D and E1 CH2: Between IJF3 and E1
    Tester Range	2 V/DIV., 20 msec./DIV.
    Condition	Idling with warm engine

    Fig 14: Injector For Direct Injection No. 1 (To No. 6) Injection Signal And Injection Confirmation Signal - Waveform Reference 13

    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

14. WAVEFORM 14 

    Fuel pump for high pressure (Spill control valve): 

    WAVEFORM REFERENCE CHART 14
    
    

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

    Fig 15: Fuel Pump For High Pressure (Spill Control Valve) - Waveform Reference 14

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

    CAN communication signal: 

    WAVEFORM REFERENCE CHART 15
    
    

    ECM Terminal Name	Between CANH and E1
    Tester Range	1 V/DIV., 10 μsec/DIV.
    Condition	Engine switch on (IG)

    HINT:

    The waveform varies depending on the CAN communication signal.

    Fig 16: CAN Communication Signal - Waveform Reference 15

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

    CAN communication signal: 

    WAVEFORM REFERENCE CHART 16
    
    

    ECM Terminal Name	Between CANL and E1
    Tester Range	1 V/DIV., 10 μsec/DIV.
    Condition	Engine switch on (IG)

    HINT:

    The waveform varies depending on the CAN communication signal.

    Fig 17: CAN Communication Signal - Waveform Reference 16

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

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

    WAVEFORM REFERENCE CHART 17
    
    

    ECM Terminal Name	Between #1P (to #6P) and E1
    Tester Range	50 V/DIV., 400 μsec/DIV.
    Condition	Idling

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

    Fig 18: Injector For Port Injection No. 1 (To No. 6) Injection Signal - Waveform Reference 17

    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
18. WAVEFORM 18 

    Cooling fan ECU signal: 

    WAVEFORM REFERENCE CHART 18
    
    

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

    Fig 19: Cooling Fan ECU Signal - Waveform Reference 18

    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002