Acura CSX. Manual — part 89
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ECM/PCM Inputs and Outputs at Connector B (
) (44P)
Terminal
number
Wire color
Terminal name
Description
Signal
11-30
Fuel and Emissions Systems
NOTE: Standard battery voltage is about 12 V.
•
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30
RED/BLK
VG
(MASS AIR FLOW
(MAF) SENSOR
SIDE)
Detects MAF sensor signal
At idle: about 1.1
1.6 V
(between VG
terminal and VG
terminal)
31
RED/YEL
IAT (INTAKE AIR
TEMPERATURE (IAT)
SENSOR)
Detects IAT sensor signal
With ignition switch ON (II): about 0.1
4.0 V
(about 1.8 V at normal operating temperature)
32
BLK/BLU
VG
(MASS AIR FLOW
(MAF) SENSOR
SIDE)
Ground for MAF sensor
signal
33
GRN/BLK
SG2 (SENSOR GROUND)
Sensor ground
Less than 1.0 V at all times
34
GRN/YEL
VTS (ROCKER ARM OIL
CONTROL SOLENOID)
Drives rocker arm oil
control solenoid
At idle: about 0 V
35
BRN
LSB (A/T CLUTCH
PRESSURE CONTROL
SOLENOID VALVE B)
Drives A/T clutch pressure
control solenoid valve B
With ignition switch ON (II): current controlled
36
BLK
PG1 (POWER GROUND)
Ground circuit for ECM/
PCM
Less than 1.0 V at all times
40
BRN
SDNP (PADDLE SHIFTER
(DOWN SHIFT SWITCH))
Detects paddle shifter
(downshift switch) signal
In S:
With paddle shifter
(downshift switch) pressed:
about 0 V
With paddle shifter
(downshift switch) released:
about 5.0 V
41
WHT/GRN
ALTC (ALTERNATOR
CONTROL)
Sends alternator control
signal
With warmed up engine running: about 5.0 V
(depending on electrical load)
42
WHT/BLU
ALTL (ALTERNATOR L
SIGNAL)
Detects alternator L signal
With ignition switch ON (II): about 0 V
With engine running: battery voltage
43
WHT/RED
ALTF (ALTERNATOR FR
SIGNAL)
Detects alternator FR signal
With engine running: about 2.6
3.4 V
(depending on electrical load)
44
RED/BLK
LSA (A/T CLUTCH
PRESSURE CONTROL
SOLENOID VALVE A)
Drives A/T clutch pressure
control solenoid valve A
With ignition switch ON (II): current controlled
1: A/T
1
1
1
Terminal side of female terminals
08/08/21 14:12:44 61SNR030_110_0030
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08
○
ECM/PCM Inputs and Outputs at Connector C (
) (44P)
Terminal
number
Wire color
Terminal name
Description
Signal
11-31
NOTE: Standard battery voltage is about 12 V.
1
WHT
IG1ETCS (IGNITION
SIGNAL ETCS)
Detects ignition signal
With ignition switch ON (II): battery voltage
2
BLK
PGMETCS (POWER
GROUND ETCS)
Ground circuit for ECM/
PCM
Less than 1.0 V at all times
3
GRN/YEL
ETCSM
(THROTTLE
ACTUATOR
SIDE)
Ground for throttle actuator
With ignition switch ON (II): about 0 V
4
BLU/RED
ETCSM
(THROTTLE
ACTUATOR
SIDE)
Drives throttle actuator
With ignition switch ON (II): about 0 V
5
BRN
INJ1 (No. 1 INJECTOR)
Drives No. 1 injector
At idle: duty controlled
With ignition switch ON (II): battery voltage
6
RED
INJ2 (No. 2 INJECTOR)
Drives No. 2 injector
7
BLU
INJ3 (No. 3 INJECTOR)
Drives No. 3 injector
8
YEL
INJ4 (No. 4 INJECTOR)
Drives No. 4 injector
9
WHT/GRN
AFSHTC (AIR FUEL RATIO
(A/F) SENSOR HEATER
CONTROL (SENSOR 1))
Drives A/F sensor heater
(sensor 1)
With ignition switch ON (II): battery voltage
With fully warmed up engine running: about 0 V
11
GRN/RED
MAP (MANIFOLD
ABSOLUTE PRESSURE
(MAP) SENSOR)
Detects MAP sensor signal
With ignition switch ON (II): about 3.0 V
At idle: about 1.0 V (depending on engine speed)
12
BLU
VCC3 (SENSOR VOLTAGE)
Provides sensor reference
voltage
With ignition switch ON (II): about 5.0 V
13
YEL/RED
VCC1 (SENSOR VOLTAGE)
Provides sensor reference
voltage
With ignition switch ON (II): about 5.0 V
14
GRN/WHT
SG1 (SENSOR GROUND)
Sensor ground
Less than 1.0 V at all times
15
YEL/GRN
IGPLS1 (No. 1 IGNITION
COIL PULSE)
Drives No. 1 ignition coil
With ignition switch ON (II): about 0 V
With engine running: pulses
16
BLU/RED
IGPLS2 (No. 2 IGNITION
COIL PULSE)
Drives No. 2 ignition coil
17
WHT/BLU
IGPLS3 (No. 3 IGNITION
COIL PULSE)
Drives No. 3 ignition coil
18
BRN
IGPLS4 (No. 4 IGNITION
COIL PULSE)
Drives No. 4 ignition coil
20
RED/BLK
TPSA (THROTTLE
POSITION (TP) SENSOR A)
Detects TP sensor A signal
With throttle fully open: about 3.9 V
With throttle fully closed: about 0.9 V
21
RED/BLU
TPSB (THROTTLE
POSITION (TP) SENSOR B)
Detects TP sensor B signal
With throttle fully open: about 4.1 V
With throttle fully closed: about 1.7 V
Terminal side of female terminals
08/08/21 14:13:36 61SNR030_110_0031
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09
○
ECM/PCM Inputs and Outputs at Connector C (
) (44P)
Terminal
number
Wire color
Terminal name
Description
Signal
11-32
Fuel and Emissions Systems
NOTE: Standard battery voltage is about 12 V.
22
BLU/BLK
VTPSW (ROCKER ARM OIL
PRESSURE SWITCH)
Detects rocker arm oil
pressure switch signal
With engine at low speed: about 0 V
With engine at high speed: battery voltage
23
BLU/WHT
VTC (VTC OIL CONTROL
SOLENOID VALVE)
Drives VTC oil control
solenoid valve
with ignition switch ON (II): about 0 V
27
WHT/RED
SHO2S (SECONDARY
HEATED OXYGEN SENSOR
(SECONDARY HO2S)
(SENSOR 2))
Detects secondary HO2S
(sensor 2) signal
With throttle fully opened from idle and warmed up
engine: about 0.6 V
With throttle quickly closed: below 0.4 V
29
RED
AFS
(AIR FUEL RATIO
(A/F) SENSOR (SENSOR 1)
SIDE)
Detects A/F sensor
(sensor 1) signal
30
RED/YEL
AFS
(AIR FUEL RATIO
(A/F) SENSOR (SENSOR 1)
SIDE)
Detects A/F sensor
(sensor 1) signal
31
GRN
CMPB (CAMSHAFT
POSITION (CMP) SENSOR
B)
Detects CMP sensor B
signal
With engine running: pulses
32
BLU/YEL
CKP (CRANKSHAFT
POSITION (CKP) SENSOR)
Detects CKP sensor signal
With engine running: pulses
36
BLK/GRN
IG1 (IGNITION SIGNAL)
Detects ignition signal
With ignition switch ON (II): battery voltage
39
GRN
SG3 (SENSOR GROUND)
Sensor ground
Less than 1.0 V at all times
40
BRN/YEL
LG1 (LOGIC GROUND)
Ground circuit for ECM/
PCM
Less than 1.0 V at all times
41
BLU/WHT
CMPA (CAMSHAFT
POSITION (CMP) SENSOR
A)
Detects CMP sensor A
signal
With engine running: pulses
42
RED/BLU
KS (KNOCK SENSOR)
Detects knock sensor signal
With engine knocking: pulses
43
BLK/WHT
NC (OUTPUT SHAFT
(COUNTERSHAFT) SPEED
SENSOR)
Detects output shaft
(countershaft) speed sensor
signals
With ignition switch ON (II): pulses
With vehicle moving: about 5.0 V (pulses)
44
BRN/YEL
LG2 (LOGIC GROUND)
Ground circuit for ECM/
PCM
Less than 1.0 V at all times
Terminal side of female terminals
08/08/21 14:13:36 61SNR030_110_0032
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19
PGM-FI System
Air Conditioning (A/C) Compressor Clutch Relay
Air Fuel Ratio (A/F) Sensor
Barometric Pressure (BARO) Sensor
Camshaft Position (CMP) Sensor B
Crankshaft Position (CKP) Sensor
Engine Coolant Temperature (ECT) Sensor 1 and 2
Ignition Timing Control
Injector Timing and Duration
11-33
ZIRCONIA
ELEMENT
SENSOR
TERMINALS
HEATER
TERMINALS
O-RING
MAGNET
TERMINAL
TERMINAL
O-RING
MAGNET
THERMISTOR
O-RING
TERMINAL
The programmed fuel injection (PGM-FI) system is a
sequential multiport fuel injection system.
When the ECM/PCM receives a demand for cooling
from the A/C system, it delays the compressor from
being energized, and enriches the mixture to assure
smooth transition to the A/C mode.
The A/F sensor operates over a wide air/fuel range. The
A/F sensor is installed upstream of the TWC, and sends
signals to the ECM/PCM which varies the duration of
fuel injection accordingly.
The BARO sensor is inside the ECM/PCM. It converts
atmospheric pressure into a voltage signal that
modifies the basic duration of the fuel injection
discharge.
CMP sensor B detects the position of the No. 1 cylinder
as a reference for sequential fuel injection to each
cylinder.
The CKP sensor detects crankshaft speed and is used by
the ECM/PCM to determine the ignition timing, timing
for the fuel injection of each cylinder, and engine
misfire detection.
ECT sensors 1 and 2 are temperature dependent
resistors (thermistors). The resistance decreases as the
engine coolant temperature increases.
The ECM/PCM contains the memory for basic ignition
timing at various engine speeds and manifold absolute
pressures. It also adjusts the timing according to engine
coolant temperature and intake air temperature.
The ECM/PCM contains the memory for basic discharge
duration at various engine speeds and manifold
pressures. The basic discharge duration, after being
read out from the memory, is further modified by
signals sent from various sensors to obtain the final
discharge duration.
By monitoring long term fuel trim, the ECM/PCM
detects long term malfunctions in the fuel system and
sets diagnostic trouble codes (DTCs) if needed.
08/08/21 14:13:37 61SNR030_110_0033
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