Tip & How-To about Audi A4

On any of todays vehicles

Automobiles of today are highly advanced pieces of machinery the first step in any automotive diagnosis is to connect a scan tool to check if any faults have been logged.

Scan tools are needed to perform basic settings on motors , modules and test various electrical components .

The second step is too see if the factory has released any technical bulletins , a bulletin can quickly alert a person to a fix before a diagnosis is started .
( you may be able to do this by searching on line )

If there are no bulletins found then a thorough diagnosis must be started .

A test drive can reveal the condition of the car while it is being driven and help the diagnosis.

If all else fails then the vehicle will need to be taken to a reputible technician.
Preerably one who has experience with your make and model.


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05 chevy equinox was running great all the sudden shut off and wont crank back. ive checked fuses now it wont even turn over. im at a loss

Is the battery good , cables and connections ? Do the headlamps turn on ? If so are they bright ? When you turn the key to on do the instrument cluster gauges move , warning light's come on then go off after 2-3 seconds ?Is the security light lit ? (anti-theft) Need more info !!!!!! Do you know how to do automotive electrical testing ? Find a electrical distribution diagram at http://www.bbbind.com/free_tsb.html Get yourself a DVOM - digital volt ohm meter and test for voltage , don't just look at fuse's . A fuse can be good ,but that doesn't mean a thing if there isn't B+ voltage there. Check out some videos on basic automotive electrical testing , how to read a wiring diagram . Also break down and buy a service repair manual . When you turn the key to start do you hear the starter solenoid click ?
Starter Solenoid Does Not Click diagnosis
Turn the ignition switch to the START position.
Is the security indicator On?
YES - Go to Security Indicator Always On or Flashing in Theft Deterrent
NO - Go to Step 3
Turn the ignition switch to the START position.
Does the starter solenoid click?
YES - Go to Starter Solenoid Clicks, Engine Does Not Crank
NO - Go to Step 4
With a scan tool, observe the Crank Request Signal parameter in the Engine Electrical powertrain control module (PCM) data list.
Turn the ignition to the START position.
Does the scan tool display that the Crank Request Signal parameter is Yes?
Go to Step 5
Go to Power Mode Mismatch in Computer/Integrating Systems
With a scan tool, observe the Starter Relay Command parameter in the PCM data list.
Turn the ignition switch to the START position.
Does the scan tool display that the Starter Relay Command parameter is ON?
Go to Step 7
Go to Step 6
Turn ON the ignition, with the engine OFF.
Verify that the transmission is in Park or Neutral.
With a scan tool, observe the TR Sw. parameter in the PCM data list.
Does the scan tool display Park or Neutral?
Go to Step 7
Go to Range Selector Displays Incorrect Range in Automatic Transaxle - AF33-5

Jan 28, 2017 | Cars & Trucks

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Good day, why craftsman diagnostic scanner show 'communication error' whenever it's scanner Nissan vehicles

PDF]Communications Could Not Be Established with Your ...

May 21, 2008 - computer alerts motorists of problems with the vehicle's emission control ... tampered with and the connection to the on-board diagnostic (OBD) ... itspower from the same circuit as the cigarette lighter. ... scan tool, connected to the data link connector (DLC) under the dash, not ... General Program Questions.Missing: craftsman ‎whenever

[PDF]OBDII ABS and Airbag Scan Tool - Actron

OBDII ABS and Airbag. Scan Tool. Model 39853 .... OBD II Diagnostic Trouble Codes (DTCs) . .... Program Mode . .... Error Messages . ... Vehicle Communication Fault ...... No warranty (expressed or implied) can be made for its accuracy or completeness... Go to www.actron.com/craftsman to download the Scanning Suite.

Scan Tool Help

A scan tool is a must for automotive diagnostic work today. ... 1996 and newervehicles (one exception is Nissan), and (2) counting the series of flashes can be confusing. ... II monitors (ready means the monitor has completed its self-check process). ... with bidirectional (two-way) communication capability and the proper ...Missing: craftsman ‎whenever

Automotive Diagnostic Scanners -- OBD-I and OBD-II


Jan 31, 2016 | Nissan Cars & Trucks

3 Answers

What is a scan tool

A scan tool allows for the OBD II (On Board Diagnostics) codes to be read from the engine computer in a car. These are common electronic diagnostics tools used by automotive technicians. They are usually used when a check engine light comes on to determine the error codes associated with the check engine light.

They almost always connect via a standard plug on the divers side under the dash.

Most automotive parts supplier will check a car with complementary service to determine the codes stored in a customers automobile.

Nov 21, 2015 | Cars & Trucks

1 Answer

checkout a 2005 buick rendiverous speedometer circuit

Speedometer and/or Odometer Inaccurate or Inoperative
Test Description
The number below refers to the step number on the diagnostic table.

  1. This test procedure may cause DTCs to set, which may cause other systems to be inoperative or disabled.





Schematic Reference: Instrument Cluster Schematics

Did you perform the Diagnostic System Check - Vehicle?
Go to Step 2
Go to Diagnostic System Check - Vehicle in Vehicle DTC Information


  1. Install a scan tool.
  2. Raise the vehicles drive wheels. Refer to Lifting and Jacking the Vehicle in General Information.
  3. Start the engine.
  4. Place the transmission into drive.
  5. With the scan tool, observe the Vehicle Speed Sensor (VSS) parameter in the engine control module (ECM)/powertrain control module (PCM) Engine Data 1 data list.

Does the VSS parameter match the speedometer display?
Go to Step 3
Go to Step 4


Does the odometer operate properly?
Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
Go to Step 4


Replace the instrument panel cluster (IPC). Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

Did you complete the replacement?
Go to Step 5


  1. Operate the system in order to verify the repair.
  2. Use the scan tool in order to clear the DTCs that may have set in other modules during diagnosis.

Did you correct the condition?
System OK
Go to Step 2

Feb 20, 2015 | 2005 Buick Rendezvous

1 Answer

Oil smells like gas

leaking injectors
get them cleaned,
or the PCM signals to injectors might be wrong.
or crazy high fuel pressure can case them to leak.
fuel in oil is bad, can cause engine bearing spin, (seizure)
id get in fresh oil, first then diagnose the cause.

was CEL lamp glowing driving? yes, bingo. SCAN IT !
if not, id check fuel pressure (at spec?>)
the id check that each injector clicks, with stethoscope or special tool i have, just for that.
and id do an injector leak down test at same time same tool
as pressure guage test.
the injector balance test. i have videos of all.
Scan it means, connect OBD2 scan tool to car, and scan for errors.
your car has advanced brains, use a newer scan tool for best results.
new tools , see newer factory only, extended errors. that are
really help full in diagnosis.

Feb 15, 2014 | 2007 Honda CR-V

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