RX400h · Service Manual ENGINE

TERMINALS OF ECM

System information

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.

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