2006 ACURA CSX fuel

SymptomDiagnostic procedure Also check for
11-14Fuel and Emissions Systems
Symptom Troubleshooting Index (cont’d)










Low power
(MIL works OK, no DTCs set)
Check the fuel pressure (see page 11-325). Low compression
Incorrect camshaft
timing
Incorrect engine oil
level
Exhaust restriction
Engine stalls
(MIL works OK, no DTCs set) 1.
2.
3.
4.DotheECM/PCMidlelearnprocedure(seepage
11-310).
Check the fuel pressure (see page 11-325).
Check the idle speed (see page 11-309).
Troubleshoot the brake pedal position switch signal
circuit (see page 11-308). Intake air leaks
Faulty harness and
sensor
connections
Fuel contamination
Difficult to refuel
(MIL works OK, no DTCs set) 1.
2.
3.Check the fuel vent tube between the EVAP canister
and the fuel tank.
Check the fuel tank vapor recirculation tube between
thefuelpipeandthefueltank.
Replace the fuel tank (see page 11-339). Malfunctioning gas
station filling
nozzle.
Filler neck
restriction
Faulty fuel tank
vapor control valve
Fuel overflows during
refueling
(No DTCs set) Replace the fuel tank (see page 11-339). Malfunctioning gas
station filling nozzle.
HDS does not communicate
with the ECM/PCM or the
vehicle Troubleshoot the DLC circuit (see page 11-204).
Fuel cap warning message
stays on
(MIL works OK, no DTCs set)
(K20Z3 engine) Troubleshoot the fuel cap warning message system
(see page 11-405).
08/08/21 14:12:36 61SNR030_110_0014
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Electronic Control Systems
Self-diagnosisOne Drive Cycle Detection Method
Two Drive Cycle Detection Method
Fail-safe Function
MIL Bulb Check and Readiness Code Condition
Self Shut Down (SSD) Mode
11-15
System Description
The functions of the fuel and emission control systems are managed by the engine control module (ECM) on vehicles
with manual transmissions or the powertrain control module (PCM) on vehicles with automatic transmissions.
The ECM/PCM detects a failure of a signal from a sensor or another control unit and stores a Temporary DTC or a DTC.
Depending on the failure, a DTC is stored in either the first or the second drive cycle (K20Z3 engine: DTC P0457, turns
on the malfunction indicator lamp (MIL) during the third drive cycle). When a DTC is stored, the ECM/PCM turns on the
malfunction indicator lamp (MIL) by a signal sent to the gauge via F-CAN.  When an abnormality occurs in the signal from a sensor or from another control unit, the ECM/PCM stores a DTC
and turns on the MIL immediately.
 When an abnormality occurs in the signal from a sensor or from another control unit in the first drive cycle, the
ECM/PCM stores a Temporary DTC. If the failure continues in the second drive cycle, the ECM/PCM stores a DTC and
turns on the MIL.
When an abnormality occurs in the signal from a sensor or another control unit, the ECM/PCM ignores the signal and
substitutes a pre-programmed value that allows the engine to continue running. This causes a DTC to be stored and
the MIL to come on.
When the ignition switch is turned to ON (II), the ECM/PCM turns on the MIL via the F-CAN circuit for about 15 to
20 seconds to check the bulb condition. If any readiness codes are not set to complete, the MIL flashes five times. If all
readiness codes are set to complete, the MIL goes off.
After the ignition switch is turned to LOCK (0), the ECM/PCM stays on (about 30 minutes). If the ECM/PCM connector is
disconnected during this time, the ECM/PCM may be damaged. To cancel this mode, disconnect the negative cable
from the battery or jump the SCS line with the HDS after the ignition switch is turned to LOCK (0).
(cont’d)
08/08/21 14:12:37 61SNR030_110_0015
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ECM/PCM Electrical Connections
11-16Fuel and Emissions Systems
System Description (cont’d)
IGNITION
SWITCH
IG1
ST B
IG2
IG1 HOT in ON (II)
and START (III) IGNITION COIL
RELAY
ELD PGM-FI MAIN
RELAY 2 (FUEL PUMP)P
FUEL PUMP
PGM-FI MAIN
RELAY 1
BATTERY A/C CONDENSER
FAN RELAYRADIATOR
FAN RELAY
A/C COMPRESSOR
CLUTCH RELAY
To
COOLING
FAN CONTROL
RELAY E
A8 IGPC36 IG1
A14 ACC
A5 FANH A23 ELD
A4 FANL GF
C
B
D
A
PG1 B36PG2 B1
MRLY A6
IMOFPR A15
SUBRLY A21
ETCSRLY A20 STARTER CUT
RELAY (ST CUT)
PGMETCS C2 PGM-FI
SUBRELAY
ETCS CONTROL
RELAY
I
IG1ETCS C1
ECM/PCM
CLUTCH
INTERLOCK
SWITCH
H
J*2
*1
T
*3
*1: A/T
*2: M/T
*3: K20Z3 engine
UNDER-HOOD
FUSE/RELAY BOX:
No. 1 MAIN FUSE (100 A)
No.19FIMAIN(15A)
No. 2 IG MAIN (50 A)
No. 23 BACK UP (10 A)
No. 12 STOP & HORN
(15 A) No. 18 IG COIL (15 A)
UNDER-DASH
FUSE/RELAY BOX: No. 3 ALTERNATOR
(10 A) No. 2 FUEL PUMP (15 A)
No. 36 IG2 HAC (A/C)
(10 A)
UNDER-HOOD
FUSE/RELAY BOX: No.15OILLVL(7.5A)
No. 11 FI SUB (15 A)
No. 21 DBW (THROTTLE
ACTUATOR CONTROL) (15 A)
08/08/21 14:12:37 61SNR030_110_0016
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ECM/PCM Electrical Connections (cont’d)
11-18 Fuel and Emissions Systems
System Description (cont’d)
D
C
EVAP CANISTER
PURGE VALVE
EVAP CANISTER
VENT SHUT VALVE
ALTERNATOR
ICM
To
SPARK
PLUG
No. 1 IGNITION COIL
To
SPARK
PLUG ICM
No. 2 IGNITION COIL
To
SPARK
PLUG ICM
No. 3 IGNITION COIL
To
SPARK
PLUG ICM
No. 4 IGNITION COIL A10 VSV B3 PCS
B42 ALTL
B43 ALTF
C15 IGPLS1
C16 IGPLS2
C17 IGPLS3
C18 IGPLS4 B41 ALTC LG1 C40 I
VTS B34 ROCKER ARM
OIL CONTROL
SOLENOID
VTC C23
AFSHTC C9
AFS C29
SHO2S C27
SO2SHTC B4
LG2 C44
AFS C30
SECONDARY
HO2S
(SENSOR 2) A/F SENSOR
(SENSOR 1)
S-NET5V A44 G
CMPA C41 K
Q
CMP SENSOR A
ROCKER ARM
OIL PRESSURE
SWITCH
P
VTPSW C22 VTC OIL CONTROL
SOLENOID VALVE
To MICU
08/08/21 14:12:38 61SNR030_110_0018
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ECM/PCM Electrical Connections (cont’d)
11-20 Fuel and Emissions Systems
System Description (cont’d)
TERMINAL LOCATIONS
*1: A/T
ECM/PCM A ( ) (44P) ECM/PCM C ( ) (44P)
ECM/PCM B ( ) (44P)
ATF TEMPERATURE SENSOR
A/T CLUTCH
PRESSURE
CONTROL
SOLENOID
VALVE A
OUTPUT SHAFT
(COUNTERSHAFT)
SPEED SENSOR
N
INPUT SHAFT
(MAINSHAFT)
SPEED SENSOR
S
A/T CLUTCH
PRESSURE
CONTROL
SOLENOID
VALVE B
A/T CLUTCH
PRESSURE
CONTROL
SOLENOID
VALVE C
TATF B27
SHA B10
SHB B11
SHC B20
SHD B26
LSA B44
NC C43
NM B17
LSB B35
LSC B25 O
M
L
J
To
SHIFT LOCK SOLENOID P
R
N
D S B15 ATPS B21 ATPD
B12 ATPN B14 ATPR B13 ATPP
A27 SLS
3RD CLUTCH
TRANSMISSION FLUID
PRESSURE SWITCH
B9 OP3SW
TRANSMISSION
RANGE SWITCH
2ND CLUTCH
TRANSMISSION FLUID
PRESSURE SWITCH B28 ATPFWD
B22 ATPRVS
B8 OP2SW
*1
SHE B24
B40 SDNP B16 SUPP
PADDLE SHIFTER
(UPSHIFT SWITCH)
PADDLE SHIFTER
(DOWNSHIFT SWITCH) SHIFT SOLENOID
VALVE A
SHIFT SOLENOID
VALVE B
SHIFT SOLENOID
VALVE C
SHIFT SOLENOID
VALVE D
SHIFT SOLENOID
VALVE E
08/08/21 14:12:40 61SNR030_110_0020
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Vacuum Hose Routing (cont’d)
K20Z3 engine
11-22Fuel and Emissions Systems
System Description (cont’d)
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
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Vacuum Distribution
K20Z2 engine
11-23
3ENGINE
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
17ATMOSPHERE
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
(cont’d)
08/08/21 14:12:41 61SNR030_110_0023
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Vacuum Distribution (cont’d)
K20Z3 engine
11-24Fuel and Emissions Systems
System Description (cont’d)
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
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