Macedon Ranges Auto Electrics Pty Ltd

For all your auto electrical & auto air conditioning needs!
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Ph: 0412 957748

Computer Diagnostics

A computer diagnostics test is a form of electronic diagnosis used to assist us in isolating a fault with your car on computer controlled systems. It is a non-invasive diagnostic procedure much like an X-ray or an MRI scan. The test may be inconclusive and further investigation/testing may be required at additional cost.


We will plug in using your cars on board diagnostics port (if fitted) & interrogate the vehicles ECU (electronic control unit). Any possible fault codes will be displayed by our computer diagnostics tool.


If your vehicles ECU has either no fault codes or none relevant to the illuminated light, further manual diagnostic checking will be required subject to the hourly labour rate. This further investigation service may require either electrical diagnostic or manual checking of the system


The computer diagnostics check is $125 inc. GST.


My car has an electrical problem & computer diagnostics is not an option!

Electrical/Wiring repairs are ones which generally cannot be diagnosed using computer diagnostics equipment & can be very labour intensive due to the integral designs of wiring looms (concealed/behind panels, under carpets, trims, through doors etc.)


An example of a wiring fault would be a tail light not working after the bulb has been replaced, in this instance there may be a break somewhere between the light switch in the dashboard & the tail light unit. The wiring between the two runs almost the whole length of the car & is subject to vibration & twisting, impact damage & abrasion. We have a fully trained auto electrician on site in order to carry out most wiring repairs you may require.


It is very difficult to quote for this type of repair as we do not know the extent & location of the fault. We give these problems to our automotive electrician who works through them with the required wiring diagrams & technical information until the fault is found, this is quoted & authorised on hourly increments. You will be kept updated throughout & can stop this electrical investigation at any time.


Hourly Fault Finding labour is $88 per hour inc. GST.


Important information

Please note: We only charge if we are able to gain access to your vehicles ECU. If we cannot gain access then we will not charge you. In some instances, main dealer diagnostics may be required as the manufacturers/main dealers will not provide the unlock codes required and in this event a professional recommendation will be provided.

Also note: It is not possible to diagnose all electrical faults or problems with your car using the computer diagnostics testing procedures. The vehicles ECU is not self diagnosing & therefore any work carried out in accordance to fault codes stored will only be done after we have been instructed to do so by you the customer.

Diagnosing computer management faults require the following steps:

Computer Diagnostic Code Read Only:

This service is available for $55.00 inc GST. For this service we plug in our diagnostic service computer and review the fault codes stored on your cars on-board computer, and provide you with a verbal confirmation of outcome. You can then decide whether to act on this information without us checking further, and instruct us accordingly.

Computer Diagnostics:

The computer diagnostics check is $125 inc GST and includes up to one hour of labour, and all further computer code readings for three months or 3,000 kms.

Manual Diagnostics:

If your vehicles ECU has either no fault codes or none relevant to the emissions failure, further manual diagnostic checking will be required subject to the hourly labour rate. This further investigation service may require either electrical diagnostic or manual investigations to identify the fault. We will contact you in this event for your instructions.


Subject to Terms & Conditions

Computer Diagnostics - Terms & Conditions

COMPUTER DIAGNOSTIC PROCEDURES / PROBLEMS

A COMPUTER DIAGNOSTIC TEST IS A NON INVASIVE DIAGNOSTIC PROCEDURE MUCH LIKE AN X-RAY OR AN MRI SCAN.
THE TEST MAY BE INCONCLUSIVE AND FURTHER INVESTIGATION/TESTING MAY BE REQUIRED AT ADDITIONAL COST.
A COMPUTER DIAGNOSTIC TEST INVOLVES DOWNLOADING STORED TROUBLE/FAULT CODES STORED IN YOUR VEHICLE'S COMPUTER/ELECTRONIC CONTROL UNIT (ECU). THIS INFORMATION IS ACCESSED VIA A COMPUTER MONITOR SCREEN AND PRINTER, AND CAN ONLY REPORT DATA STORED. THEREFORE, IF A FAULT IS RECORDED IN YOUR VEHICLE'S COMPUTER MEMORY WE HAVE TO BELIEVE THAT IT IS CORRECT. UNFORTUNATELY THE STORED INFORMATION IS NOT ALWAYS A CORRECT/ACCURATE DIAGNOSIS OF THE VEHICLE'S PROBLEM AND ONLY POINTS US IN A GENERAL DIRECTION. IN SOME CASES THE VEHICLE'S ECU CAN GIVE MISLEADING/WRONG INFORMATION CODES, OR ECU MAY BE FAULTY ITSELF. PROBLEMS CAN OCCUR WHEN YOUR VEHICLE'S "MIL LIGHT" IS ON, AND THE VEHICLE HAS A MISFIREOR JERKING PROBLEM. THE COMPUTER REPORTS/DIAGNOSES A FAULT WITH A PARTICULAR PART/UNIT. THE UNIT/PART IS REPLACED AND THE "MIL LIGHT" IS NOW EXTINGUISHED, BUT THE ORIGINAL MISFIRE/JERKING FAULT IS NOT CURED, THIS CAN HAPPEN EVEN THOUGH THE COMPUTER REPORTS THE FAULT IS NO LONGER PRESENT/STORED IN THE ECU. THERE MAY BE A WIRING, ECU FAULT, INTERMITTENT OR UNDERLYING PROBLEM NOT APPARENT AT THE TIME OF TESTING.


THE ABOVE INFORMATION IS EXPLAINED TO THE CUSTOMER BEFORE ANY DIAGNOSTIC WORK IS CARRIED OUT. THE CUSTOMER MUST INSTRUCT/AUTHORISE US TO ACT ON THE INFORMATION SUPPLIED BY THE ECU. IF DIAGNOSTIC TESTING IS INCONCLUSIVE, FURTHER ELECTRICAL INVESTIGATION OR REPAIRS / REPLACEMENT PARTS THAT ARE MOST LIKELY TO CAUSE THE PROBLEM CAN BE REPLACED. WE CANNOT BE HELD RESPONSIBLE IF PROBLEMS PERSIST AFTER PARTS ARE REPLACED AND WORK IS CARRIED OUT. FURTHER IN DEPTH ELECTRICAL CHECKING/WORK CAN BE CARRIED OUT IF REPLACING ECU DIAGNOSED PARTS PROVES UNSUCCESSFUL, THIS REPAIR IS ADDITIONAL TO THE EXISTING REPAIR (AT CURRENT LABOUR RATE), AND CAN BE VERY TIME CONSUMING, CUSTOMERS ARE ADVISED OF VEHICLES PROGRESS AT HOURLY INTERVALS
NO ELECTRICAL PARTS FITTED CAN BE RETURNED FOR CREDIT.


DIAGNOSTICS/FAULT FINDING, USING DONOR CARS

THE ONLY OTHER WAY TO DIAGNOSE PROBLEMS WITHOUT OCCURRING PARTS COST IS BY SUBSTITUTING PARTS FROM A DONOR VEHICLES, IE TRIAL AND ERROR. THIS IS USUALLY EASIER AND QUICKER AT A MAIN DEALER DUE TO THE AMOUNT OF IDENTICAL CARS ON SITE. AND SOME TIMES IT CAN ALSO KEEP LABOUR COSTS DOWN. OCCASIONALLY WHEN COMPUTER DIAGNOSED REPLACED PARTS HAVE NOT CURED THE ORIGINAL PROBLEM AND OTHER CHEAPER OPTIONS HAVE BEEN EXPLORED, RATHER THAN PAY FOR EXPENSIVE FURTHER ELECTRICAL INVESTIGATION IT MAY BE MORE COST-EFFECTIVE TO TAKE THE CAR TO THE MAIN DEALER AS THE GROUND/FOUNDATION WORK WILL HAVE BEEN DONE AND THE MAIN DEALER CAN CONCENTRATE ON OTHER CAUSES.