Acura CSX. Instruction — page 92

*10

Fuel Cap Warning Message

To make the message go off (with the HDS)

To make the message go off (without the
HDS) (’06 model)

To make the message go off (without the
HDS) (’07-09 models)

First drive cycle

Procedure

Procedure

Procedure

11-42

Fuel and Emissions Systems

A

Shows CHECK FUEL CAP
in the gauge display.

The ECM/PCM detects a loose or missing fuel fill cap as
an evaporative system leak, and alarts the driver by
showing a warning message in the gauge display.

The first time a leak is detected a CHECK FUEL CAP
message is shown in the gauge display (A). To scroll to
another message, press the select/reset button. The
CHECK FUEL CAP message appears each time you
restart the engine until the system turns the message
off. Turn the engine off, then replace or tighten the fuel
fill cap until it clicks at least once.

1. Tighten the fuel fill cap until it clicks.

2. Clear the Temporary DTC with the HDS.

3. Verify there is no leak by doing the EVAP

FUNCTION TEST in the INSPECTION MENU with
the HDS.

1. Tighten the fuel fill cap until it clicks.

2. The message should go off after several days of

normal driving.

1. Tighten the fuel fill cap until it clicks.

2. Start the engine, then turn the ignition switch to

LOCK (0).

3. Repeat step 2 two more times.

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14

Electronic Throttle Control System Diagram

11-43

TP SENSOR A

TP SENSOR B

THROTTLE
ACTUATOR

THROTTLE
BODY

From
ETCS CONTROL
RELAY

VARIOUS
SENSORS

ECM/
PCM

APP
SENSOR A

APP
SENSOR B

BRN

YEL

BLU

PUR

LT BLU

GRY

BLK

YEL

GRN

RED/BLU

BLU

BLU/RED
GRN/YEL

RED/BLK

The electronic throttle control system consists of the throttle actuator, throttle position (TP) sensor A/B, accelerator
pedal position (APP) sensor A/B, the electronic throttle control system (ETCS) control relay, and the ECM/PCM.

* : This illustration shows K20Z2 engine

08/08/21 14:13:43 61SNR030_110_0043

*11

Exhaust Gas Recirculation (EGR) System Diagram (K20Z2 engine)

11-44

Fuel and Emissions Systems

INTAKE MANIFOLD

EGR VALVE

EGR VALVE
POSITION SENSOR

YEL/BLU

GRN/BLK

WHT/BLK

BLU/RED

BLK/RED
(BLK)

BLK

ECM/PCM

VARIOUS
SENSORS

* : ’07-09 models

*

The EGR system reduces oxides of nitrogen (NOx) emissions by recirculating exhaust gas through the EGR valve and
the intake manifold into the combustion chambers. The ECM/PCM memory includes the ideal EGR valve position for
varying operating conditions.

The EGR valve position sensor detects the amount of EGR valve lift and sends it to the ECM/PCM. The ECM/PCM then
compares it with the ideal lift in its memory (based on signals sent from other sensors). If there is any difference
between the two, the ECM/PCM cuts current to the EGR valve.

08/08/21 14:13:43 61SNR030_110_0044

*12

Evaporative Emission (EVAP) Control Diagram

11-45

ATMOSPHERE

ATMOSPHERE

FUEL FILL
CAP

FUEL TANK VAPOR
RECIRCULATION
TUBE

FUEL TANK VAPOR
CONTROL VALVE

VARIOUS
SENSORS

FUEL TANK

FTP SENSOR

EVAP CANISTER
VENT SHUT VALVE

PUR

LT GRN

ECM/PCM

BLK

YEL

YEL/BLU

BLK/YEL

RED

BLU

BLK

LT GRN

From
No. 3
ALTERNATOR
(10 A) FUSE

From
PGM-FI
SUBRELAY

EVAP
CANISTER

EVAP CANISTER
PURGE VALVE

ATMOSPHERE

The EVAP controls minimize the amount of fuel vapor escaping into the atmosphere. Vapor from the fuel tank is
temporarily stored in the EVAP canister until it can be purged from the canister into the engine and burned.

The EVAP canister is purged by drawing fresh air through it and into a port on the intake manifold.
The purging vacuum is controlled by the EVAP canister purge valve, which operates whenever engine coolant
temperature is above 60 °C (140 °F).

* : This illustration shows K20Z2 engine

08/08/21 14:13:44 61SNR030_110_0045

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