The Car Clinic

The Car Clinic. "On track with modern automobile technology" Specialists in engine (diesel/ petrol)rebuid, diagnosis and repair.

Reading and clearing diagnostic trouble codes. We also give repair infomation through discussions and repair manuals for variety of car models from different manufacturers. The Car Clinic also provides educational information designed to benefit automobile engineering students at various levels, enthusiasts, qualified engineers who wish to advance their knowledge, diagnostic and troubleshooting c

Photos from The Car Clinic's post 20/08/2022

There is even "Brotherhood" in automobiles!!



[PDF] HOW TO DIAGNOSE VP44 FUEL SYSTEM ISSUES - Free Download PDF 1 PAGE ONE HOW TO DIAGNOSE VP44 FUEL SYSTEM ISSUES Updated September 14, 2012 OVERVIEW I feel qualified to help you as I...

Photos from The Car Clinic's post 23/12/2021

The Car Clinic
Introducing Fundamentals Of
Onboard Diagnostics


Welcome to The Car Clinic! Don't forget to like or follow us on Facebook and Instagram. We help you understand motor vehicle operation principles, improve diagnostic, troubleshooting and repair capabilities. The Car Clinic keeps you up-to-date with morden motor vehicle technology. Thanks for visiting The Car Clinic and we hope to see you soon!


Good day Good people.
I am back with another brain teaser for automobile technicians, students and enthusiasts. Below is realtime data captured on a Honda fit with L13A engine. Lets find anomalies therein, possible causes, symptoms and remedies.


Dear friends,
Below is a screenshot captured during a diagnosis session (fromVW Golf 4 with AFH engine). What best remedy do you recommend basing on realtime data on the screenshot.




Combustion is the basic chemical process of releasing energy from burning a fuel and air mixture.
In an internal combustion engine (ICE), the ignition and combustion of the fuel occurs within the engine itself. The engine then converts the energy from the combustion to work.
The engine consists of a fixed cylinder and a moving piston. The expanding combustion gases push the piston, which in turn rotates the crankshaft. Ultimately, through a system of gears in the powertrain, this motion drives the vehicle’s wheels.

There are two kinds of internal combustion engines :
**The spark ignition (gasoline) engine and
**The compression ignition (diesel) engine.
Most of these engines are four-stroke cycle engines.
Four piston strokes are needed to make a complete a cycle of operation. The cycle is made up of four distinct processes:
(i) intake, {suck}
(i)compression, {squeeze}
(iii)combustion and power stroke,{burn}
(iv) exhaust.{blow}

Spark ignition and compression ignition engines differ in the way they supply and ignite the air-fuel mixture.
In a spark ignition engine, the fuel is mixed with air and then inducted into the cylinder during the intake process. After this suction stroke, the piston squeezes the fuel-air mixture, and a spark ignites it, causing the mixture to burn and explode forcefully pushing the piston down. The forced downwards movement of the piston which results from expansion of the burnt gases makes the power stroke.
In a compression ignition engine(diesel), only air is inducted into the engine and then compressed. Diesel engines then spray the fuel into the hot compressed air at a suitable, measured rate, causing it to ignite.


The Car Clinic is a page dedicated to motor vehicle technicians, students, enthusiasts and home mechanics. This page is a platform for answers to all your car-related questions, repair procedures, diagnosis, troubleshooting and general information applicable to morden vehicle technology.

The Car Clinic updated their website address. 19/10/2021

The Car Clinic updated their website address.

The Car Clinic updated their website address.


Operation, failures and symptoms

The clutch pressure plate is an important part of your manual vehicle’s clutch system. It is a heavy metal plate that is controlled by springs and a lever. Its main purpose is to apply pressure to the primary clutch plate (or clutch disc), holding it against the engine flywheel. This allows energy to flow from the engine crankshaft, through the engaged clutch into the transmission / gearbox system, then through driveshafts and to the wheels.

When the driver depresses the clutch pedal, the pressure plate stops applying pressure to the primary clutch plate which disengages (removes friction pressure) between the clutch pressure plate, the clutch plate and the engine flywheel. This cuts the transmission of engine torque, allowing the driver to easily engage and change gears.

Listed below are seven major causes of clutch plate failures.

(1) Worn clutch disc – A worn clutch disc / plate can cause damage to the clutch pressure plate. Once the linings are completely worn off the clutch disc / plate the rivets or other metal parts of the clutch plate will rub directly on the pressure plate.

(2) Broken Fingers or Spring – if one of more of the clutch pressure plate fingers that protrude out from the centre of the clutch plate are broken or bent then the clutch will not operate correctly, and maybe become difficult to engage your gears. If the clutch pressure plate spring arrangement is broken, then you may not be able to engage or disengage your clutch and gears at all.

(3) Overheating – If your car’s clutch is slipping the clutch system generates a lot of heat. Clutch damage further exposes parts such as the pressure plate to excess heat, causing them to warp or wear more quickly.

(4) Clutch slipping – A slipping clutch can cause damage to the surface of your pressure plate. Clutch slipping can be caused by many different problems in your vehicle’s transmission system.

(5) Incorrect installation – It is important that a certain distance remains between the pressure plate and its release bearing. If part of your clutch was installed incorrectly, then the thrust bearing may be damaging your clutch pressure plate.

(6)Incorrectly adjusted clutch cable – if the clutch cable is over tightened the clutch thrust bearing may constantly press against the clutch pressure plate, causing constant slight clutch slip and damage.

(7)Improper use of clutch – If the clutch is used improperly, it can cause damage to your clutch pressure plate. Examples of improper use include, riding the clutch too much while taking off on hills, skipping gears or using the clutch to slow down the vehicle by using engine braking.


**Slipping clutch – A damaged pressure plate will cause the clutch to slip. A slipping clutch often produces the following symptoms:

*Lack of vehicle power
*Higher RPM
*Difficulty in engaging or shifting gears
*Reduced clutch pedal resistance
*Burning smell from the clutch
*Inability to tow a trailer or difficulty driving up hills
*Audible noise when clutch is released – You may hear a creaking noise when you press down the clutch pedal. This may be attributed to a problem in the plate’s release bearing or pressure plate fingers or spring arrangement.

*Vibration in your transmission – An incorrectly balanced or loose pressure plate / flywheel can cause your clutch system to vibrate.

*Difficult clutch engagement – Your clutch may become hard to use. This can be caused by various problems in your clutch, including a bent pressure plate, plate “fingers” hitting the flywheel or damaged pressure plate drive straps.


For all your onboard diagnostics contact us. Pleasure in our job puts perfection to our work.


Wishing you and yours some well-deserved downtime and a very happy new year to come. Cheers to health, happiness, and prosperity in 2021! Wishing you and yours a safe, healthy, and prosperous new year! Wishing you and yours a happy, healthy, and abundant 2021!


With this free online course you will be introduced to the automobile industry and the workshop environment.
You will learn the roles and responsibilities of a motor vehicle mechanic. This course will teach you about the workshop environment, the anatomy of automobiles, and the basics of electricity in the motor repair industry.


Photos from The Car Clinc's post


Fundamentals of Automotive Troubleshooting

How to Approach Troubleshooting
The most important points for troubleshooting Your Automotive
• Correctly identify the symptoms of the malfunction. When troubleshooting, it is important to correctly identify the symptoms that the customer points out.
• Work efficiently to determine the estimated cause in order to find the true cause. To correctly and promptly perform troubleshooting, systematic work is required.
Estimation must be backed up by logic and facts
When estimating the cause, a technician must not rely on his sixth sense without any logical back-up. Asking the question “why” is of great importance. When a technician makes an estimations about the cause, he must check whether facts that support this estimation exist or not. To troubleshoot the true cause, the technician must adopt a habit of following the cause-and-effect relationship of each item by observing the following cycle: estimate and verify, estimate and verify.
Troubleshooting Procedure
The troubleshooting procedure consists mainly of five stages. When a technician troubleshoots, and does not follow the necessary procedure, the malfunction could become complicated and finally the technician may perform irrelevant repair procedure due to the wrong estimation. To prevent this, he should understand the five stages accurately when troubleshooting.
Stage 1:
Verifying and reproducing the symptom
Verifying and reproducing the symptoms is the first step in troubleshooting. The most important element in troubleshooting is to correctly observe the factual malfunction (symptoms) that the customer points out and make an appropriate judgement without any preconceptions.
What is diagnostic questioning?
To reproduce the symptoms, ask the customer about the conditions under which the symptoms occur.
Stage 2:
Determining whether or not it is a malfunction
When a customer makes a complaint, there are various cases. Not all of the symptoms are related to malfunctions but could be characteristics inherent to that vehicle. If a technician repairs a vehicle that has no malfunction, he will not only be wasting valuable wasting time, but will lose the customer’s trust. What is a malfunction? An abnormal condition that occurs in a certain portion of the equipment, causing defective function.
Stage 3:
Estimating the cause of the malfunction
Estimating the cause of the malfunction should be done systematically based on the malfunction symptom that the technician has confirmed. To accurately estimate the cause of the malfunction
Stage 4:
Inspecting the suspected area and fi nding the cause
Troubleshooting is a step-by-step repetitive process for approaching the true cause of a malfunction based on facts (data) obtained through verification (inspection).
Important points for inspection
Stage 5:
Recurrence prevention
Repairs are completed not just when the malfunction is eliminated, but when the fear of recurrence has also been removed. Important points for preventing recurrence


Diesel Engine Control System.

Outline and Operation of Intake Shutter

The intake shutter is mounted on the intake manifold. The intake shutter is fully open when the engine is operating. To stop the engine, the VSV operates in accordance with the signals from the ECU, and the actuator closes the intake shutter. As a result, the amount of vibration is reduced when the engine is stopped.


VSV (Vacuum Switching Valve)

Signals received from the ECU cause the VSV to switch the pressure applied to the actuator between atmospheric and vacuum pressures.

EGR (Exhaust Gas RecirculationSystem)

In the EGR system, the ECU controls the vacuum regulator valve based on the signals that are sent by various sensors, in order to operate (open and close) the EGR valve. This causes a portion of the post-combustion gases to recirculate through the intake manifold to slow down the combustion speed. This lowers the combustion temperature and reduces the generation of nitrogen oxides. Through the adoption of the diesel throttle, it has become possible to increase the intake manifold pressure in order to stabilize the EGR volume.

Vacuum Regulator Valve

The vacuum regulator valve operates in accordance with the signals from the ECU to turn ON/OFF the vacuum (generated by the vacuum pump) that actuates the EGR valve.

EGR Valve

The vacuum that is sent by the vacuum regulator valve operates (opens and closes) the EGR valve to introduce the post-combustion gases into the intake manifold.

Operation of EGR System

The operation of the EGR is stopped under the conditions listed below in order to ensure drivability and reduce black smoke.

When the coolant temperature is low.

When the vehicle is being driven under high-load conditions.

When the engine is decelerating (the EGR operates during idle).

When the vehicle is being driven at high altitudes.

On 15B-FTE and 1HD-FTE engines, the mounting position of the EGR valve has been improved in order to prevent its performance from being affected by the intake air temperature.

On the 15B-FTE engine, a dual construction EGR pipe has been adopted. The coolant water flows along the outside of the pipe to cool the EGR gases. Thus, the intake air is prevented from being warmed by the EGR gases.

Intake Shutter Inspection

To inspect the intake shutter, connect a vacuum gauge to the diaphragm, and verify that the actuator rod moves when the specified amount of vacuum is applied to it. Measure the resistance between the VSV terminals for the intake shutter.

Diesel Throttle Inspection

An inspection of the diesel throttle consists of an inspection of the throttle motor. Remove the throttle motor connector and measure the resistance between the specified terminals.

Photos from The Car Clinc's post 06/11/2019

Photos from The Car Clinc's post

Automotive Troubleshooting - Solving Car Problems 24/10/2019

Automotive Troubleshooting - Solving Car Problems

Automotive Troubleshooting - Solving Car Problems Automotive Troubleshooting - Solving Car Problems


Toyota 1Kz te manual pdf


Here is a link to WL 2.5 D manual

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In an attempt to catch them young 26/06/2019

In an attempt to catch them young

The world outside looks so unkind. I will fight to fulfil the dream of your choice my son!

In an attempt to catch them young


Mazda Titan RF common rail diesel engine with bad injectors



Generally, the main hardware for traction control and ABS are mostly the same. In many vehicles traction control is provided as an additional option to ABS.

Each wheel is equipped with a sensor which senses changes in its speed due to loss of traction.
The sensed speed from the individual wheels is passed on to an electronic control unit (ECU).
The ECU processes the information from the wheels and initiates braking to the affected wheels via a cable connected to an automatic traction control (ATC) valve.
In all vehicles, traction control is automatically started when the sensors detect loss of traction at any of the wheels


A traction control system (TCS), also known as ASR (from German: Antriebsschlupfregelung, lit. 'engine slippage regulation'), is typically (but not necessarily) a secondary function of the electronic stability control (ESC) on production motor vehicles, designed to prevent loss of traction of driven road wheels. TCS is activated when throttle input and engine torque are mismatched to road surface conditions.

Intervention consists of one or more of the following:

Brake force applied to one or more wheels
Reduction or suppression of spark sequence to one or more cylinders
Reduction of fuel supply to one or more cylinders
Closing the throttle, if the vehicle is fitted with drive by wire throttle
In turbocharged vehicles, a boost control solenoid is actuated to reduce boost and therefore engine power.
Typically, traction control systems share the electrohydraulic brake actuator (which does not use the conventional master cylinder and servo) and wheel speed sensors with ABS


An anti-lock braking system (ABS) is a safety anti-skid braking system used on vehicles, such as cars, motorcycles, trucks and buses and even aircraft. ABS operates by preventing the wheels from locking up during braking, thereby maintaining tractive contact with the road surface.

ABS is an automated system that uses the principles of threshold braking and cadence braking, techniques which were once practised by skilful drivers before ABS braking systems were widespread. ABS operates at a much faster rate and more effectively than most drivers could manage. Although ABS generally offers improved vehicle control and decreases stopping distances on dry and some slippery surfaces, on loose gravel or snow-covered surfaces ABS may significantly increase braking distance, while still improving steering control.
Since ABS was introduced in production vehicles, such systems have become increasingly sophisticated and effective. Modern versions may not only prevent wheel lock under braking, but may also alter the front-to-rear brake bias. This latter function, depending on its specific capabilities and implementation, is known variously as electronic brakeforce distribution, traction control system, emergency brake assist, or electronic stability control (ESC).


Greeting The Car Clinic family. I hope you are fine and have not been dissappointed since we havent posted for a long time now. We apologize for that, we were slightly shaken by the increase in data tarrifs.
Anyway, we are back and for the next few days we shall be discussing ABS(anti-lock braking system) and TCS (traction control system),systems most of our morden vehicles are equipped with.
We will look at what these systems are, what they do and how they operate.
Hope you will enjoy!!

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