Acura CSX. Instruction — page 87

06

K20Z3 engine

11-22

Fuel and Emissions Systems

EVAPORATIVE EMISSION
(EVAP) CANISTER PURGE VALVE

To
EVAPORATIVE
EMISSION (EVAP)
CANISTER

INTAKE AIR
BYPASS CONTROL
THERMAL VALVE

FRONT OF
VEHICLE

08/08/21 14:12:40 61SNR030_110_0022

*04

Vacuum Distribution

K20Z2 engine

11-23

3

ENGINE
COOLANT

9

5

18

4

6

7

8

20

19

2

26

16

15

25

11

13

14

10

21

23

12

ATMOSPHERE

1

ENGINE
COOLANT

24

17

ATMOSPHERE

22

MASS AIR FLOW (MAF) SENSOR/
INTAKE AIR TEMPERATURE (IAT) SENSOR

AIR FUEL RATIO (A/F) SENSOR (SENSOR 1)
SECONDARY HEATED OXYGEN SENSOR
(SECONDARY HO2S) (SENSOR 2)
MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR
ENGINE COOLANT TEMPERATURE (ECT) SENSOR 1
CRANKSHAFT POSITION (CKP) SENSOR
KNOCK SENSOR
CAMSHAFT POSITION (CMP) SENSOR B
CAMSHAFT POSITION (CMP) SENSOR A
THROTTLE BODY
INJECTOR
FUEL PRESSURE REGULATOR
FUEL FILTER
FUEL PUMP
FUEL TANK

INTAKE AIR RESONATOR

POSITIVE CRANKCASE VENTILATION (PCV) VALVE
THREE WAY CATALYTIC CONVERTER

EVAPORATIVE EMISSION (EVAP) CANISTER

EVAPORATIVE EMISSION (EVAP) CANISTER
PURGE VALVE

EVAPORATIVE EMISSION (EVAP) CANISTER
VENT SHUT VALVE
FUEL TANK PRESSURE (FTP) SENSOR
INTAKE AIR BYPASS CONTROL THERMAL VALVE
FUEL TANK VAPOR CONTROL VALVE

AIR CLEANER

EXHAUST GAS RECIRCULATION (EGR) VALVE and
POSITION SENSOR

08/08/21 14:12:41 61SNR030_110_0023

*05

K20Z3 engine

11-24

Fuel and Emissions Systems

3

ENGINE
COOLANT

9

5

17

4

6

7

8

19

18

2

25

16

15

24

11

13

14

10

20

22

12

ATMOSPHERE

1

ENGINE
COOLANT

23

ATMOSPHERE

21

MASS AIR FLOW (MAF) SENSOR/
INTAKE AIR TEMPERATURE (IAT) SENSOR

AIR FUEL RATIO (A/F) SENSOR (SENSOR 1)
SECONDARY HEATED OXYGEN SENSOR
(SECONDARY HO2S) (SENSOR 2)
MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR
ENGINE COOLANT TEMPERATURE (ECT) SENSOR 1
CRANKSHAFT POSITION (CKP) SENSOR
KNOCK SENSOR
CAMSHAFT POSITION (CMP) SENSOR B
CAMSHAFT POSITION (CMP) SENSOR A
THROTTLE BODY
INJECTOR
FUEL PRESSURE REGULATOR
FUEL FILTER
FUEL PUMP
FUEL TANK

INTAKE AIR RESONATOR
POSITIVE CRANKCASE VENTILATION (PCV) VALVE
THREE WAY CATALYTIC CONVERTER

EVAPORATIVE EMISSION (EVAP) CANISTER

EVAPORATIVE EMISSION (EVAP) CANISTER
PURGE VALVE

EVAPORATIVE EMISSION (EVAP) CANISTER
VENT SHUT VALVE
FUEL TANK PRESSURE (FTP) SENSOR
INTAKE AIR BYPASS CONTROL THERMAL VALVE
FUEL TANK VAPOR CONTROL VALVE

AIR CLEANER

08/08/21 14:12:42 61SNR030_110_0024

05

ECM/PCM Inputs and Outputs at Connector A (

) (44P)

Terminal

number

Wire color

Terminal name

Description

Signal

11-25

NOTE: Standard battery voltage is about 12 V.

4

PUR

FANL (RADIATOR FAN
CONTROL)

Drives radiator fan relay

With radiator fan running: about 0 V
With radiator fan stopped: battery voltage

5

GRY

FANH (RADIATOR FAN
CONTROL)

Drives A/C condenser fan
relay

With A/C condenser fan running: about 0 V
With A/C condenser fan stopped: battery voltage

6

GRN

MRLY (PGM-FI MAIN
RELAY 1)

Drives PGM-FI main relay 1
Power source for DTC
memory

With ignition switch ON (II): about 0 V
With ignition switch OFF: battery voltage

8

ORN

IGP (POWER SOURCE)

Power source for ECM/PCM
circuit

With ignition switch ON (II): battery voltage

9

BLK

SG6 (SENSOR GROUND)

Sensor ground

Less than 1.0 V at all times

10

LT GRN

VSV (EVAPORATIVE
EMISSION (EVAP)
CANISTER VENT SHUT
VALVE)

Drives EVAP canister vent
shut valve

With ignition switch ON (II): battery voltage

14

RED

ACC (A/C COMPRESSOR
CLUTCH RELAY)

Drives A/C compressor
clutch relay

With compressor ON: about 0 V
With compressor OFF: battery voltage

15

BRN

IMOFPR (IMMOBILIZER
FUEL PUMP RELAY)

Drives PGM-FI main relay 2
(FUEL PUMP)

About 0 V for 2 seconds after turning ignition switch
ON (II), then battery voltage

16

LT GRN

ACPD (A/C PRESSURE
SENSOR)

Detects A/C pressure
sensor signal

With A/C switch ON: about 1.7

4.8 V

(depending on A/C pressure)

17

YEL

APSA (ACCELERATOR
PEDAL POSITION (APP)
SENSOR A)

Detects APP sensor A signal

With ignition switch ON (II) and accelerator pedal
pressed: about 4.7 V
With ignition switch ON (II) and accelerator pedal
released: about 0.5 V

18

PUR

APSB (ACCELERATOR
PEDAL POSITION (APP)
SENSOR B)

Detects APP sensor B signal

With ignition switch ON (II) and accelerator pedal
pressed: about 2.3 V
With ignition switch ON (II) and accelerator pedal
released: about 0.25 V

19

RED

VCC6 (SENSOR VOLTAGE)

Provides sensor reference
voltage

With ignition switch ON (II): about 5.0 V

20

YEL

ETCSRLY (ELECTRONIC
THROTTLE CONTROL
SYSTEM (ETCS) CONTROL
RELAY)

Drives electronic throttle
control system (ETCS)
control relay

With ignition switch ON (II): about 0 V
(4.0 V momentarily)

21

PNK

SUBRLY (PGM-FI
SUBRELAY)

Drives PGM-FI subrelay

With ignition switch ON (II): about 0 V

23

ORN

ELD (ELECTRICAL LOAD
DETECTOR (ELD))

Detects ELD signal

With ignition switch ON (II): about 0.1

4.8 V

(depending on electrical load)

Terminal side of female terminals

08/08/21 14:12:42 61SNR030_110_0025

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