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Terminals Of ECM

Fig 1: Identifying ECM Terminals
G05199980Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

The standard normal voltage between each pair of the ECM (Included in HV control ECU) 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.

ECM TERMINALS VOLTAGE SPECIFICATION

Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
BATT (H12-1) - E1 (H14-5) GR - W-B Battery (for measuring battery voltage and for ECM memory) Always 9 to 14 V
+BM (H17-3) - E1 (H14-5) L - W-B Power source of throttle motor Always 9 to 14 V
IG SW (H12-9) - E1 (H14-5) P - W-B Ignition switch Ignition switch ON 9 to 14 V
+B1 (H17-2) - E1 (H14-5) R - W-B Power source of ECM Ignition switch ON 9 to 14V
+B2 (H17-1) - E1 (H14-5) R - W-B Power source of ECM Ignition switch ON 9 to 14 V
OC1+ (H14-16) - OC1- (H14-15) G-W - G-R Camshaft timing oil control valve (OCV) (Intake side (bank 1)) Ignition switch ON Pulse generation (see  1waveform 1)
OC2+ (H14-14) - OC2- (H14-13) L-R - G-B Camshaft timing oil control valve (OCV) (Intake side (bank 2)) Ignition switch ON Pulse generation (see  1waveform 1)
MREL (H17-12) - E1 (H14-5) Y - W-B IGCT relay Ignition switch ON 9 to 14 V
VC (H15-18) - E2 (H15-28) Y - BR Power source for sensors (specific voltage) Ignition switch ON 4.5 to 5.0 V
VG (H15-30) - EVG (H15-29) R - G Mass air flow meter Idling, Shift lever position P or N, A/ C switch OFF 0.5 to 3.0 V
THA (H15-20) - E2 (H15-28) B-L - BR Intake air temperature sensor Idling, Intake air temperature 20°C (68°F) 0.5 to 3.4 V
THW (H15-19) - E2 (H15-28) G-B - BR Engine coolant temperature sensor Idling, Engine coolant temperature 80°C (176°F) 0.2 to 1.0 V
VTA (H15-21) - E2 (H15-28) W - BR Throttle position sensor (for engine control) Ignition switch ON, Throttle valve fully closed 0.5 to 1.2 V
VTA (H15-21) - E2 (H15-28) W - BR Throttle position sensor (for engine control) Ignition switch ON, Throttle valve fully open 3.2 to 4.8 V
VTA2 (H15-31) - E2 (H15-28) O - BR Throttle position sensor (for sensor malfunction detection) Ignition switch ON, Accelerator pedal released 2.1 to 3.1 V
VTA2 (H15-31) - E2 (H15-28) O - BR Throttle position sensor (for sensor malfunction detection) Ignition switch ON, Accelerator pedal depressed 4.5 to 5.0 V
VPA (H17-25) - EP1 (H17-33) O - W-G Accelerator pedal position sensor (for engine control) Ignition switch ON, Accelerator pedal released 0.5 to 1.1 V
VPA (H17-25) - EP1 (H17-33) O - W-G Accelerator pedal position sensor (for engine control) Ignition switch ON, Accelerator pedal depressed 2.6 to 4.5 V
VPA2 (H17-26) - EP2 (H17-32) Y - R Accelerator pedal position sensor (for sensor malfunctioning detection) Ignition switch ON, Accelerator pedal released 1.2 to 2.0 V
VPA2 (H17-26) - EP2 (H17-32) Y - R Accelerator pedal position sensor (for sensor malfunctioning detection) Ignition switch ON, Accelerator pedal depressed 3.4 to 5.0 V
VCP1 (H17-24) - EP2 (H17-32) G - R Power source of accelerator pedal position sensor (for VPA) Ignition switch ON 4.5 to 5.0 V
VCP2 (H17-31) - EP2 (H17-32) BR - R Power source of accelerator pedal position sensor (for VPA2) Ignition switch ON 4.5 to 5.0 V
HA1A (H16-4) - E04 (H 16-6)
HA2A (H16-3) - E05 (H16-5)		 B-W - W-B
R-W - BR		 A/F sensor heater Idling Below 3.0 V
HA1A (H16-4) - E04 (H16-6)
HA2A (H16-3) - E05 (H16-5)		 B-W - W-B
R-W - BR		 A/F sensor heater Ignition switch ON 9 to 14 V
A1A+ (H16-22) - E1 (H14-5) BR - W-B A/F sensor Ignition switch ON 3.3 V*
A2A+ (H16-23) - E1 (H14-5) P - W-B A/F sensor Ignition switch ON 3.3 V*
A1A- (H16-30) - E1 (H14-5) Y - W-B A/F sensor Ignition switch ON 3.0 V*
A2A- (H16-31) - E1 (H14-5) L - W-B A/F sensor Ignition switch ON 3.0 V*
HT1B (H12-21) - E1 (H14-5)
HT2B (H16-33) - E1 (H14-5)		 GR - W-B
W-L - W-B		 Heated oxygen sensor heater Idling Below 3.0 V
HT1B (H12-21) - E1 (H14-5)
HT2B (H16-33) - E1 (H14-5)		 GR - W-B
W-L - W-B		 Heated oxygen sensor heater Ignition switch ON 9 to 14 V
OX1B (H12-19) - E2 (H15-28)
OX2B (H16-26) - E2 (H15-28)		 B - BR
W - BR		 Heated oxygen sensor Engine speed maintained at 2,500 rpm for 2 minutes after warming up sensor Pulse generation (see  2waveform 2)
#10 (H15-1) - E1 (H14-5)
#20 (H15-2) - E1 (H14-5)
#30 (H15-3) - E1 (H14-5)
#40 (H15-4) - E1 (H14-5)
#50 (H15-5) - E1 (H14-5)
#60 (H16-7) - E1 (H14-5)		 L - W-B
Y - W-B
B - W-B
W - W-B
B-W - W-B
G - W-B		 Injector Ignition switch ON 9 to 14 V
#10 (H15-1) - E1 (H14-5)
#20 (H15-2) - E1 (H14-5)
#30 (H15-3) - E1 (H14-5)
#40 (H15-4) - E1 (H14-5)
#50 (H15-5) - E1 (H14-5)
#60 (H16-7) - E1 (H14-5)		 L - W-B
Y - W-B
B - W-B
W - W-B
B-W - W-B
G - W-B		 Injector Idling Pulse generation (see  3waveform 3)
KNK1 (H16-29) - EKNK (H16-28) B - W Knock sensor Engine speed maintained at 4,000 after warming up Pulse generation (see  4waveform 4)
KNK2 (H16-21) - EKN2 (H16-20) R - G Knock sensor Engine speed maintained at 4,000 after warming up Pulse generation (see  4waveform 4)
VV1+ (H14-27) - NE- (H14-24) B-W - G Variable valve timing (VVT) sensor (Intake side (bank 1)) Idling Pulse generation (see  5waveform 5)
VV2+ (H14-26) - NE- (H14-24) L - G Variable valve timing (VVT) sensor (Intake side (bank 2)) Idling Pulse generation (see  5waveform 5)
NE+ (H14-25) - NE- (H14-24) R - G Crankshaft position sensor Idling Pulse generation (see  5waveform 5)
IGT1 (H15-8) - E1 (H14-5)
IGT2 (H15-9) - E1 (H14-5)
IGT3 (H15-10) - E1 (H14-5)
IGT4 (H15-11) - E1 (H14-5)
IGT5 (H15-12) - E1 (H14-5)
IGT6 (H15-13) - E1 (H14-5)		 R-L - W-B
P - W-B
Y-B - W-B
L-Y - W-B
G-Y - W-B
L-R - W-B		 Ignition coil (ignition signal) Idling Pulse generation (see  6waveform 6)
IGF (H15-24) - E1 (H14-5) W-R - W-B Ignition coil (ignition confirmation signal) Ignition switch ON 4.5 to 5.0 V
IGF (H15-24) - E1 (H14-5) W-R - W-B Ignition coil (ignition confirmation signal) Idling Pulse generation (see  6waveform 6)
PRG (H15-17) - E1 (H14-5) G - W-B EVAP VSV Ignition switch ON 9 to 14 V
PRG (H15-17) - E1 (H14-5) G - W-B EVAP VSV Idling Pulse generation (see  7waveform 7)
SPDI (H12-24) - E1 (H14-5) SB - W-B Speed signal from combination meter Ignition switch ON, Driving wheel slowly rotated Pulse generation (see  8waveform 8)
ST2 (H12-20) - E1 (H14-5) W - W-B Starter signal Ignition switch START 9 to 14 V
STP (H12-31) - E1 (H14-5) B - W-B Stop light switch Brake pedal depressed 7.5 to 14 V
STP (H12-31) - E1 (H14-5) B - W-B Stop light switch Brake pedal released Below 1.5 V
ST1- (H12-25) - E1 (H14-5) LG - W-B Stop light switch (opposite to STP terminal) Ignition switch ON, Brake pedal depressed Below 1.5 V
ST1- (H12-25) - E1 (H14-5) LG - W-B Stop light switch (opposite and STP terminal) Ignition switch ON, Brake pedal released 7.5 to 14 V
M+ (H14-3) - ME01 (H14-4) B - BR Throttle actuator Idling with warm engine Pulse generation (see  9waveform 9)
M- (H14-2) - ME01 (H14-4) W - BR Throttle actuator Idling with warm engine Pulse generation (see  1waveform 10)
FC (H17-8) - E1 (H14-5) P - W-B Fuel pump control Ignition switch ON 9 to 14 V
FC (H17-8) - El (H14-5) P - W-B Fuel pump control Idling 0 to 3V
W (H12-14) - E1 (H14-5) L - W-B MIL Ignition switch ON Below 3.0 V
W (H12-14) - E1 (H14-5) L - W-B MIL Idling 9 to 14 V
TC (H12-3) - E1 (H14-5) O - W-B Terminal TC of DLC3 Ignition switch ON 9 to 14 V
VPMP (H13-16) - E1 (H14-5) W - W-B Vent valve (built into pump module) Ignition switch ON 9 to 14 V
MPMP (H13-6) - E1 (H14-5) Y - W-B Vacuum pump (built into pump module) Vacuum pump OFF 0 to 3V
MPMP (H13-6) - E1 (H14-5) Y - W-B Vacuum pump (built into pump module) Vacuum pump ON 9 to 14 V
PPMP (H13-27) - E2 (H15-28) O - BR Pressure sensor (built into pump module) Ignition switch ON 3 to 3.6 V
CANH (H13-25) - E1 (H14-5) B - W-B CAN communication line Ignition switch ON Pulse generation (see  1waveform 11)
CANL (H13-33) - E1 (H14-5) W - W-B CAN communication line Ignition switch ON Pulse generation (see  12waveform 12)
PTNK (H13-35) - E2 (H15-28) V - BR Fuel tank pressure sensor Ignition switch ON 0.5 to 4.5 V
CCV2 (H13-12) - E1 (H14-5) B - W-B Fuel vapor-containment valve Close valve ON (Open) Below 1.0 V
Close valve OFF (Close) 10 to 14 V
HINT:
*: The ECM terminal voltage is constant regardless of the output voltage from the sensor.
  1. WAVEFORM 1 
    Fig 2: Waveform Graph (Waveform 1)
    G04828019Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Camshaft timing oil control valve (OCV) 

    WAVEFORM REFERENCE (WAVEFORM 1)

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

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

  2. WAVEFORM 2 
    Fig 3: Waveform Graph (Waveform 2)
    G05199982Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Heated oxygen sensor 

    WAVEFORM REFERENCE (WAVEFORM 2)

    ECM Terminal Name Between OX1B and E2 or OX2B and E2
    Tester Range 0.2 V/DIV, 200 msec./DIV
    Condition Engine speed maintained at 2,500 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.

  3. WAVEFORM 3 
    Fig 4: Waveform Graph (Waveform 3)
    G05199983Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    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 msec./DIV
    Condition Idling

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

  4. WAVEFORM 4 
    Fig 5: Waveform Graph (Waveform 4)
    G05199984Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    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 msec./DIV
    Condition Engine speed maintained at 4,000 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.
  5. WAVEFORM 5 
    Fig 6: Waveform Graph (Waveform 5)
    G05199985Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Crankshaft position sensor and VVT 

    WAVEFORM REFERENCE (WAVEFORM 5)

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

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

  6. WAVEFORM 6 
    Fig 7: Waveform Graph (Waveform 6)
    G05199986Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

    WAVEFORM REFERENCE (WAVEFORM 6)

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

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

  7. WAVEFORM 7 
    Fig 8: Waveform Graph (Waveform 7)
    G04828025Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    EVAP VSV 

    WAVEFORM REFERENCE (WAVEFORM 7)

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

  8. WAVEFORM 8 
    Fig 9: Waveform Graph (Waveform 8)
    G05199988Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Vehicle speed signal 

    WAVEFORM REFERENCE (WAVEFORM 8)

    ECM Terminal Name Between SPDI 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.

  9. WAVEFORM 9 
    Fig 10: Waveform Graph (Waveform 9)
    G05199989Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Throttle actuator positive terminal 

    WAVEFORM REFERENCE (WAVEFORM 9)

    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.

  10. WAVEFORM 10 
    Fig 11: Waveform Graph (Waveform 10)
    G04828028Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    : Throttle actuator negative terminal 

    WAVEFORM REFERENCE (WAVEFORM 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.

  11. WAVEFORM 11 
    Fig 12: Waveform Graph (Waveform 11)
    G05007661Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    CAN communication signal 

    WAVEFORM REFERENCE (WAVEFORM 11)

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

    HINT:

    The waveform varies depending on the CAN communication signal.

  12. WAVEFORM 12 
    Fig 13: Waveform Graph (Waveform 12)
    G04828031Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    CAN communication signal 

    WAVEFORM REFERENCE (WAVEFORM 12)

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

    HINT:

    The waveform varies depending on the CAN communication signal.

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