SFI SYSTEM > TERMINALS OF ECM

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A103802E08

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


Symbols (Terminal No.)
Wiring Color
Terminal Description
Condition
Specified Condition
BATT (H29-1) - E1 (H32-5)
GR - BR
Battery (for measuring battery voltage and for ECM memory)
Always
9 to 14 V
+BM (H31-3) - E1 (H32-5)
L - BR
Power source of throttle motor
Always
9 to 14 V
IGSW (H29-9) - E1 (H32-5)
G - BR
Engine switch
Ignition switch ON
9 to 14 V
+B1 (H31-2) - E1 (H32-5)
R - BR
Power source of ECM
Ignition switch ON
9 to 14 V
+B2 (H31-1) - E1 (H32-5)
R - BR
Power source of ECM
Ignition switch ON
9 to 14 V
OC1+ (H32-16) - OC1- (H32-15)
G-W - G-R
Camshaft timing oil control valve (OCV) (Intake side (bank 1))
Ignition switch ON
Pulse generation (see waveform 1)
OC2+ (H32-14) - OC2- (H32-13)
L-R - G-B
Camshaft timing oil control valve (OCV) (Intake side (bank 2))
Ignition switch ON
Pulse generation (see waveform 1)
MREL (H31-12) - E1 (H32-5)
Y - BR
EFI MAIN relay
Ignition switch ON
9 to 14 V
VC (H34-18) - E2 (H34-28)
Y - BR
Power source for sensors (specific voltage)
Ignition switch ON
4.5 to 5.0 V
VG (H34-30) - EVG (H34-29)
R - G
Mass air flow meter
Idling, Shift lever position P or N, A/C switch OFF
0.5 to 3.0 V
THA (H34-20) - E2 (H34-28)
B-L - BR
Intake air temperature sensor
Idling, Intake air temperature 20°C (68°F)
0.5 to 3.4 V
THW (H34-19) - E2 (H34-28)
G-B - BR
Engine coolant temperature sensor
Idling, Engine coolant temperature 80°C (176°F)
0.2 to 1.0 V
VTA (H34-21) - E2 (H34-28)
W - BR
Throttle position sensor (for engine control)
Ignition switch ON, Throttle valve fully closed
0.5 to 1.2 V
VTA (H34-21) - E2 (H34-28)
W - BR
Throttle position sensor (for engine control)
Ignition switch ON, Throttle valve fully open
3.2 to 4.8 V
VTA2 (H34-31) - E2 (H34-28)
O - BR
Throttle position sensor (for sensor malfunction detection)
Ignition switch ON, Accelerator pedal released
2.1 to 3.1 V
VTA2 (H34-31) - E2 (H34-28)
O - BR
Throttle position sensor (for sensor malfunction detection)
Ignition switch ON, Accelerator pedal depressed
4.5 to 5.0 V
VPA1 (H31-25) - EP1 (H31-33)
O - W-G
Accelerator pedal position sensor (for engine control)
Ignition switch ON, Accelerator pedal released
0.5 to 1.1 V
VPA1 (H31-25) - EP1 (H31-33)
O - W-G
Accelerator pedal position sensor (for engine control)
Ignition switch ON, Accelerator pedal depressed
2.6 to 4.5 V
VPA2 (H31-26) - EP2 (H31-32)
R - Y
Accelerator pedal position sensor (for sensor malfunctioning detection)
Ignition switch ON, Accelerator pedal released
1.2 to 2.0 V
VPA2 (H31-26) - EP2 (H31-32)
R - Y
Accelerator pedal position sensor (for sensor malfunctioning detection)
Ignition switch ON, Accelerator pedal depressed
3.4 to 5.0 V
VCP1 (H31-24) - EP2 (H31-32)
G - Y
Power source of accelerator pedal position sensor (for VPA)
Ignition switch ON
4.5 to 5.0 V
VCP2 (H31-31) - EP2 (H31-32)
BR - Y
Power source of accelerator pedal position sensor (for VPA2)
Ignition switch ON
4.5 to 5.0 V
HA1A (H33-4) - E04 (H33-6)
HA2A (H33-3) - E05 (H33-5)
B-W - W-B
R-W - BR
A/F sensor heater
Idling
Below 3.0 V
HA1A (H33-4) - E04 (H33-6)
HA2A (H33-3) - E05 (H33-5)
B-W - W-B
R-W - BR
A/F sensor heater
Ignition switch ON
9 to 14 V
A1A+ (H33-22) - E1 (H32-5)
BR - BR
A/F sensor
Ignition switch ON
3.3 V*
A2A+ (H33-23) - E1 (H32-5)
P - BR
A/F sensor
Ignition switch ON
3.3 V*
A1A- (H33-30) - E1 (H32-5)
Y - BR
A/F sensor
Ignition switch ON
3.0 V*
A2A- (H33-31) - E1 (H32-5)
L - BR
A/F sensor
Ignition switch ON
3.0 V*
HT1B (H29-21) - E1 (H32-5)
HT2B (H33-33) - E1 (H32-5)
R - BR
W-L - BR
Heated oxygen sensor heater
Idling
Below 3.0 V
HT1B (H29-21) - E1 (H32-5)
HT2B (H33-33) - E1 (H32-5)
R - BR
W-L - BR
Heated oxygen sensor heater
Ignition switch ON
9 to 14 V
OX1B (H29-19) - E2 (H34-28)
OX2B (H33-26) - E2 (H34-28)
B - BR
W - BR
Heated oxygen sensor
Maintain engine speed at 2,500 rpm for 2 minutes after warming up sensor
Pulse generation (see waveform 2)
#10 (H34-1) - E1 (H32-5)
#20 (H34-2) - E1 (H32-5)
#30 (H34-3) - E1 (H32-5)
#40 (H34-4) - E1 (H32-5)
#50 (H34-5) - E1 (H32-5)
#60 (H33-7) - E1 (H32-5)
L - BR
Y - BR
B - BR
W - BR
B-W - BR
G - BR
Injector
Ignition switch ON
0 to 5 V
#10 (H34-1) - E1 (H32-5)
#20 (H34-2) - E1 (H32-5)
#30 (H34-3) - E1 (H32-5)
#40 (H34-4) - E1 (H32-5)
#50 (H34-5) - E1 (H32-5)
#60 (H33-7) - E1 (H32-5)
L - BR
Y - BR
B - BR
W - BR
B-W - BR
G - BR
Injector
Idling
Pulse generation (see waveform 3)
KNK1 (H33-29) - EKNK (H33-28)
B - W
Knock sensor
Maintain engine speed at 4,000 after warming up
Pulse generation (see waveform 4)
KNK2 (H33-21) - EKN2 (H33-20)
R - G
Knock sensor
Maintain engine speed at 4,000 after warming up
Pulse generation (see waveform 4)
VV1+ (H32-27) - NE- (H32-24)
B-W - G
Variable valve timing (VVT) sensor (Intake side (bank 1))
Idling
Pulse generation (see waveform 5)
VV2+ (H32-26) - NE- (H32-24)
R-L - G
Variable valve timing (VVT) sensor (Intake side (bank 2))
Idling
Pulse generation (see waveform 5)
NE+ (H32-25) - NE- (H32-24)
R - G
Crankshaft position sensor
Idling
Pulse generation (see waveform 5)
IGT1 (H34-8) - E1 (H32-5)
IGT2 (H34-9) - E1 (H32-5)
IGT3 (H34-10) - E1 (H32-5)
IGT4 (H34-11) - E1 (H32-5)
IGT5 (H34-12) - E1 (H32-5)
IGT6 (H34-13) - E1 (H32-5)
R-L - BR
P - BR
Y-B - BR
L-Y - BR
G-Y - BR
L-R - BR
Ignition coil (ignition signal)
Idling
Pulse generation (see waveform 6)
IGF1 (H34-24) - E1 (H32-5)
W-R - BR
Ignition coil (ignition confirmation signal)
Ignition switch ON
4.5 to 5.0 V
IGF1 (H34-24) - E1 (H32-5)
W-R - BR
Ignition coil (ignition confirmation signal)
Idling
Pulse generation (see waveform 6)
PRG (H34-17) - E1 (H32-5)
G - BR
EVAP VSV
Ignition switch ON
9 to 14 V
PRG (H34-17) - E1 (H32-5)
G - BR
EVAP VSV
Idling
Pulse generation (see waveform 7)
SPDI (H29-24) - E1 (H32-5)
LG - BR
Speed signal from combination meter
Ignition switch ON, Rotate driving wheel slowly
Pulse generation (see waveform 8)
ST2 (H29-20) - E1 (H32-5)
Y - BR
Starter signal
Ignition switch START
9 to 14 V
STP (H29-31) - E1 (H32-5)
O - BR
Stop light switch
Brake pedal depressed
7.5 to 14 V
STP (H29-31) - E1 (H32-5)
O - BR
Stop light switch
Brake pedal released
Below 1.5 V
ST1- (H29-25) - E1 (H32-5)
LG - BR
Stop light switch
(opposite to STP terminal)
Ignition switch ON, Brake pedal depressed
Below 1.5 V
ST1- (H29-25) - E1 (H32-5)
LG - BR
Stop light switch
(opposite and STP terminal)
Ignition switch ON, Brake pedal released
7.5 to 14 V
M+ (H32-3) - ME01 (H32-4)
B - BR
Throttle actuator
Idling with warm engine
Pulse generation (see waveform 9)
M- (H32-2) - ME01 (H32-4)
W - BR
Throttle actuator
Idling with warm engine
Pulse generation (see waveform 10)
FC (H31-8) - E1 (H32-5)
P - BR
Fuel pump control
Ignition switch ON
9 to 14 V
FC (H31-8) - E1 (H32-5)
P - BR
Fuel pump control
Idling
0 to 3 V
W (H29-14) - E1 (H32-5)
BR - BR
MIL
Ignition switch ON
Below 3.0 V
W (H29-14) - E1 (H32-5)
BR - BR
MIL
Idling
0 to 3 V
TC (H29-3) - E1 (H32-5)
BR - BR
Terminal TC of DLC 3
Ignition switch ON
9 to 14 V
CANH (H30-25) - E1 (H32-5)
B - BR
CAN communication line
Ignition switch ON
Pulse generation (see waveform 11)
CANL (H30-33) - E1 (H32-5)
W - BR
CAN communication line
Ignition switch ON
Pulse generation (see waveform 12)

HINT:
*: The ECM terminal voltage is constant regardless of the output voltage from the sensor.


WAVEFORM 1
A093229E02

Camshaft timing oil control valve (OCV) 
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.


WAVEFORM 2
A088863E05

Heated oxygen sensor 
ECM Terminal Name
Between OX1B and E2 or OX2B and E2
Tester Range
0.2 V/DIV, 200 msec./DIV
Condition
Engine speed maintained a 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.


WAVEFORM 3
A096732E01

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


WAVEFORM 4
A085286E03

Knock sensor 
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 a 4,000 rpm after warming up engine

HINT:
  1. The wavelength becomes shorter as the engine rpm increases.
  2. The waveforms and amplitudes displayed differ slightly depending on the vehicle.


WAVEFORM 5
A031763E01

Crankshaft position sensor and VVT 
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.


WAVEFORM 6
G035664E01

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


WAVEFORM 7
A093230E01

EVAP VSV 
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.


WAVEFORM 8
A093224E05

Vehicle speed signal 
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.


WAVEFORM 9
A093274E03

Throttle actuator positive terminal 
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.


WAVEFORM 10
A093275E03

Throttle actuator negative terminal 
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.


WAVEFORM 11
A086154E05

CAN communication signal 
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.


WAVEFORM 12
A086155E01

CAN communication signal 
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.