Acura CSX. Instruction — page 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).

08/08/21 14:12:36 61SNR030_110_0014

SNR9A00A20300000000CAAT00

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)

08/08/21 14:12:37 61SNR030_110_0016

*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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