Acura CSX. Manual — part 85
Symptom
Diagnostic procedure
Also check for
11-14
Fuel and Emissions Systems
•
•
•
•
•
•
•
•
•
•
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.
Do the ECM/PCM idle learn procedure (see page
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
the fuel pipe and the fuel tank.
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).
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Electronic Control Systems
Self-diagnosis
One 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).
08/08/21 14:12:37 61SNR030_110_0015
*01
+
ECM/PCM Electrical Connections
11-16
Fuel and Emissions Systems
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 RELAY
RADIATOR
FAN RELAY
A/C COMPRESSOR
CLUTCH RELAY
To
COOLING
FAN CONTROL
RELAY
E
A8 IGP
C36 IG1
A14 ACC
A5 FANH
A23 ELD
A4 FANL
G
F
C
B
D
A
PG1 B36
PG2 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. 19 FI MAIN (15 A)
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. 15 OIL LVL (7.5 A)
No. 11 FI SUB (15 A)
No. 21 DBW (THROTTLE
ACTUATOR CONTROL)
(15 A)
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*34
+
−
11-17
A
No. 1 INJECTOR
No. 2 INJECTOR
No. 3 INJECTOR
No. 4 INJECTOR
IAT SENSOR
MAP SENSOR
SG1 C14
MAP C11
VCC1 C13
ECT SENSOR 1
ECT1 B23
IAT B31
KNOCK SENSOR
KS C42
K
SG2 B33
C6 INJ2
C5 INJ1
C7 INJ3
C8 INJ4
VG
B30
VG
B32
F
EGRP B29
VCC2 B18
MAF SENSOR
L
M
EGR B2
EGR VALVE
POSITION
SENSOR
EGR VALVE
N
O
*1
C32 CKP
C31 CMPB
BARO SENSOR
(Built into
the ECM/PCM)
CMP SENSOR B
CKP SENSOR
A28 NEP
To EPS CONTROL UNIT
*4
*1: A/T
*4: K20Z2 engine
08/08/21 14:12:38 61SNR030_110_0017
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