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On-Board Diagnostics II (OBDII)

July 18th, 2010 · No Comments

injection systems and a catalytic converter, and one of the most effective pollutant reduction
combinations is the 3-way catalytic converter combined with a lambda (excess-air factor or air
ratio) closed-loop control system.
In order to achieve the precise control that these modern systems require, virtually all of the
automobiles and light trucks manufactured in North America since the early 1980s are equipped
with an on-board computer. The vehicle’s computer controls engine parameters such as the fuel
injection system performance under dynamic operating conditions. These ’smart’ computer
systems are also known as On-Board Diagnostics or OBD systems.
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Audi Diagnostic Trouble Codes DTC Table – General

November 21st, 2008 · No Comments

From model year 1996, vehicles manufactured for the North American market are equipped with a Government required diagnostic system known as On-Board Diagnostics II (OBD II). This system monitors operation and function of all engine management system activity and automatic transmission operation to insure compliance with specified emission levels.

Vehicle emission levels are constantly monitored by the OBD II system and malfunctions are recognized and recorded. A Malfunction Indicator Light (MIL) in the instrument cluster alerts the driver to the fault and the need to have the system checked for fault codes. These codes follow a standard format and are known as Diagnostic Trouble Codes (DTCs).
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1994 Toyota Engine Performance Theory & Operation

September 24th, 2008 · No Comments

This article covers basic description and operation of engine performance-related systems and components. Read this article before diagnosing vehicles or systems with which you are not completely familiar.

COMPUTERIZED ENGINE CONTROLS TOYOTA COMPUTER CONTROL SYSTEM (TCCS)
The TCCS is a computerized emission, ignition and fuel injection control system. The TCCS lowers exhaust emissions while maintaining good fuel economy and driveability. System consists of various sensors, switches and control units. See Figs. 1 and 2. An Engine Control Module (ECM) controls the TCCS based on input signals received from various input devices. The ECM contains preprogrammed data to maintain optimum engine performance under all operating conditions.
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VW Diagnostic Trouble Codes (DTC)

August 8th, 2008 · No Comments

From model year 1996, vehicles manufactured for the North American market are equipped with a Government required diagnostic system known as On-Board Diagnostics II (OBD II). This system monitors operation and function of all engine management system activity and automatic transmission operation to insure compliance with specified emission levels.
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1995 Volvo 850 Turbo Engine Troubleshooting With Codes

July 23rd, 2008 · No Comments

850 turbo uses a Motronic 4.3 control system, which has a single Electronic Control Module (ECM) to control fuel injection and ignition systems. In addition, Motronic 4.3 control system incorporates an on-board diagnostic function. Signals from various sensors are monitored continuously. If certain signals are lost or become faulty, ECM will adopt fixed substitute values (limp-home mode) to enable vehicle to be driven for certain failures. Substitute values can be adopted for Engine Coolant Temperature (ECT) sensor signal, Throttle Position (TP) sensor signal, Mass Airflow (MAF) sensor signal, and oxygen sensor (HO2S) signal. See Fig. 1.
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1999 Suzuki Vitara 1.6L & 2.0L ENGINE PERFORMANCE Self-Diagnostics

July 17th, 2008 · No Comments

CIRCUIT TEST A-1: MALFUNCTION INDICATOR LIGHT (MIL)
With ignition on, PCM energizes main relay. As PCM is supplied ignition power, MIL illuminates. After engine starts, MIL turns off if no malfunction is detected. If a malfunction is detected, MIL will remain illuminated until system is repaired.
1) Turn ignition on. Observe instrument cluster warning lights. If all warning lights illuminate except for MIL, go to next step. If no warning lights illuminate, check for blown fuses, faulty ignition switch, or poor connection at instrument cluster. Repair as necessary.
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1994 Suzuki Sidekick 1.6L TBI ENGINE PERFORMANCE Self-Diagnostics

July 16th, 2008 · No Comments

Assembly Line Data Link (ALDL) connector may also be referred to as Data Link Connector (DLC). The term CHECK ENGINE light is now referred to as Malfunction Indicator Light (MIL). The MIL is displayed in instrument cluster as CHECK ENGINE.

If no faults were found while performing BASIC DIAGNOSTIC PROCEDURES, proceed with self-diagnostics. If no fault codes or only pass codes are present after entering self-diagnostics, proceed to the H – TESTS W/O CODES article in the ENGINE PERFORMANCE section for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.).
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Nissan Xterra Owners Manual Guide

March 29th, 2008 · No Comments

Air bag warning light Air cleaner housing filter Air conditioner Air conditioner operation Air conditioner service Air conditioner specification label Air conditioner system refrigerant and lubrication recommendations Heater and air conditioner controls Air flow charts Alarm system (See theft warning) Anchor point locations Antenna Anti-lock brake system (ABS) Anti-lock brake warning light Ashtray (See cigarette lighter and ashtray) Audio system FM-AM radio with cassette player and compact disc (CD) player FM-AM radio with compact disc (CD) changer Steering wheel audio control switch Auto-lock free-running hubs Automatic Automatic power window switch Automatic transmission fluid (ATF) Driving with automatic transmission Transmission selector lever lock release
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