2003 HONDA CIVIC Throttle

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Page 240 of 1139

HONDA CIVIC 2003 7.G Workshop Manual Intake Air System
Refer to the System Diagram to see the functional
layout of the system.
Intake Air Bypass Control Thermal Valve
When the engine is running, the intake air bypass
control thermal valv

Page 243 of 1139

HONDA CIVIC 2003 7.G Workshop Manual Fuel and Emissions Systems
System Descriptions (contdl
ldle Control System Diagram
The idle speed of the engine is controlled by the ldle Air Control (lAC) varve:
Aftertheenginestarts,theIACvalveope

Page 254 of 1139

HONDA CIVIC 2003 7.G Workshop Manual Evaporative Emissions (EVAP) Control
System Monitor and Readiness code
NOTE:
All readiness code are cleared when the batterV is
disconnected or when the ECM is cleared with the
OBD ll scan tool or Hon

Page 255 of 1139

HONDA CIVIC 2003 7.G Workshop Manual Fuel and Emissions Systems
a
a
How to Set Readiness Codes (contd)
Misfire Monitor and Readiness Code
. This readiness code is always set to available
because misfiring is continuously monitored.. l\4

Page 256 of 1139

HONDA CIVIC 2003 7.G Workshop Manual PGM-FI System
Component Location Index
CAMSHAFT POS]TION {CMP) SENSOR B(TOP DEAD CENTER (TDC}SENSORITroubleshootina. oaoe 1 1-95Replacement, p;ge 1-1.1 14
ELECTRICAL LOADDETECTOR {ELDITroubleshooting,

Page 267 of 1139

HONDA CIVIC 2003 7.G Workshop Manual PGM-FI System
DTC Troubleshooting (contdl
DTC P0122: TP Sensor Circuit Low Voltage
1. Turn the ignition switch oN (111.
2. Check the throttle position with the scan tool.
ls there about 10./. or 0.5

Page 269 of 1139

HONDA CIVIC 2003 7.G Workshop Manual PGM-FI System
(
(
DTC Troubleshooting (contd)
DTC P0123: TP Sensor Circuit High Voltage
1. Turn the ignition switch oN (ll)
2. Check the throttle position with the scan tool.
ls there about 10% or 0.

Page 270 of 1139

HONDA CIVIC 2003 7.G Workshop Manual DTC Pl121: TP Sensor Signal Lower Than
Expected
1. Turn the ignition switch ON (ll).
2. Check the throttle position with the scan tool.
ls 12.9/.,0.6 V, or higher indicated when the
throttle is tully