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ENGINE CONTROL SYSTEM
6999-0003 7/15/99
4-5
CALCULATING AIR FLOW
The ECM uses air pressure, air temperature, engine
speed, and throttle position to calculate the air flow. A
barometric pressure sensor,
built in to the ECM, senses
air pressure. An
air temperature sensor
, mounted in the
air cleaner, provides air temperature information. A
throttle position sensor
is a variable resistor located on
the end of the throttle plate shaft. It provides information
about the size of the throttle opening. The closed throttle
position is set at the factory, but will need to be reset
periodically as parts wear and seat together. Use the
Examinator diagnostic tool to reset the closed throttle
position.
The throttle body is equipped with an
idle air control
(IAC) valve
and stepper motor assembly. This valve pro-
vides a path for air flow during startup and at low engine
speed.
Because air flow is calculated and not an actual mea-
surement, the ECM applies a correction factor to the idle
air control. This correction factor is called the
IACV
adaption
. As intake parts wear and seat together, air
leakage can change. The ECM allows the IACV adap-
tion to change, absorbing the effects of changing air
leakage. Use the Examinator diagnostic tool to reset the
IACV adaption after replacing the throttle body or the
idle air control.
Содержание HCX 1999
Страница 1: ......
Страница 5: ...FOREWORD 6999 0003 7 15 99 iii...
Страница 7: ...6999 0003 7 15 99 v...
Страница 8: ...1 0 6999 0003 7 15 99 ROUTINE MAINTENANCE 1...
Страница 10: ...1 2 6999 0003 7 15 99 ROUTINE MAINTENANCE TROUBLESHOOTING MAINTENANCE INTERVALS...
Страница 18: ...1 10 6999 0003 7 15 99 ROUTINE MAINTENANCE...
Страница 19: ...ROUTINE MAINTENANCE 6999 0003 7 15 99 1 11...
Страница 20: ...ROUTINE MAINTENANCE NOTES 6999 0003 7 15 99 1 12...
Страница 21: ...ROUTINE MAINTENANCE 6999 0003 7 15 99 1 13...
Страница 22: ...2 0 6999 0003 7 15 99 BODY EXHAUST 2...
Страница 37: ...BODY EXHAUST 6999 0003 7 15 99 2 15...
Страница 38: ...3 0 6999 0003 7 15 99 LUBRICATION SYSTEM 3 10732...
Страница 49: ...LUBRICATION SYSTEM NOTES 6999 0003 7 15 99 3 11...
Страница 50: ...4 0 6999 0003 7 15 99 ENGINE CONTROL SYSTEM 4...
Страница 206: ...5 0 6999 0003 7 15 99 ENGINE REMOVAL INSTALLATION 5...
Страница 208: ...5 2 6999 0003 7 15 99 ENGINE REMOVAL INSTALLATION TROUBLESHOOTING...
Страница 235: ...ENGINE REMOVAL INSTALLATION 6999 0003 7 15 99 5 29...
Страница 236: ...5 30 6999 0003 7 15 99 ENGINE REMOVAL INSTALLATION...
Страница 237: ...ENGINE REMOVAL INSTALLATION 6999 0003 7 15 99 5 31...
Страница 238: ...5 32 6999 0003 7 15 99 ENGINE REMOVAL INSTALLATION...
Страница 239: ...ENGINE REMOVAL INSTALLATION 6999 0003 7 15 99 5 33...
Страница 240: ...5 34 6999 0003 7 15 99 ENGINE REMOVAL INSTALLATION...
Страница 241: ...ENGINE REMOVAL INSTALLATION 6999 0003 7 15 99 5 35...
Страница 242: ...5 36 6999 0003 7 15 99 ENGINE REMOVAL INSTALLATION...
Страница 243: ...ENGINE REMOVAL INSTALLATION 6999 0003 7 15 99 5 37...
Страница 244: ...5 38 6999 0003 7 15 99 ENGINE REMOVAL INSTALLATION...
Страница 245: ...ENGINE REMOVAL INSTALLATION NOTES 6999 0003 7 15 99 5 39...
Страница 246: ...6 0 6999 0003 7 15 99 CYLINDER HEAD CAM DRIVE 6...
Страница 274: ...7 0 6999 0003 7 15 99 CYLINDER PISTON 7...
Страница 292: ...8 0 6999 0003 7 15 99 CRANKCASE CRANKSHAFT 8...
Страница 308: ...9 0 6999 0003 7 15 99 PRIMARY DRIVE 9 10794...
Страница 316: ...10 0 6999 0003 7 15 99 CLUTCH 10 10758...
Страница 333: ...CLUTCH NOTES 6999 0003 7 15 99 10 17...
Страница 334: ...11 0 6999 0003 7 15 99 TRANSMISSION 11 10822...
Страница 352: ...12 0 6999 0003 7 15 99 WHEELS 12 10736...
Страница 373: ...WHEELS NOTES 6999 0003 7 15 99 12 21...
Страница 374: ...13 0 6999 0003 7 15 99 FRONT SUSPENSION STEERING 13...
Страница 392: ...14 0 6999 0003 7 15 99 REAR SUSPENSION 14...
Страница 398: ...14 6 6999 0003 7 15 99 REAR SUSPENSION StepNumber 1 2...
Страница 399: ...REAR SUSPENSION 6999 0003 7 15 99 14 7...
Страница 400: ...15 0 6999 0003 7 15 99 BRAKES 15...
Страница 420: ...16 0 6999 0003 7 15 99 BATTERY CHARGING SYSTEM 16...
Страница 431: ...BATTERY CHARGING SYSTEM NOTES 6999 0003 7 15 99 16 11...
Страница 432: ...17 0 6999 0003 7 15 99 STARTER 17 10722...
Страница 443: ...STARTER NOTES 6999 0003 7 15 99 17 11...
Страница 444: ...18 0 6999 0003 7 15 99 LIGHTS GAUGES SWITCHES 18...
Страница 472: ...18 28 6999 0003 7 15 99 LIGHTS GAUGES SWITCHES...
Страница 474: ...WIRING SCHEMATIC NOTES 19 2 6999 0003 7 15 99...