To test the MAF (Mass Air Flow) sensor for air mass temperature problems on a Land Rover 3.0 SDV6 / TDV6, you can follow these steps. This guide assumes you have a basic understanding of automotive diagnostics and access to necessary tools. ### Tools and Materials Needed 1. OBD-II scanner 2. Multimeter 3. Screwdrivers and pliers 4. Cleaning solution (if necessary) 5. Protective gloves ### Steps to Test the MAF Sensor #### 1. **Locate the MAF Sensor** - The MAF sensor is typically located between the air filter box and the throttle body. - Consult the vehicle’s manual if you are unsure about its exact location. #### 2. **Inspect the Sensor** - Before testing, visually inspect the MAF sensor and its wiring for any obvious signs of damage, such as cracks, loose connections, or corrosion. - Make sure the air filter is clean and properly installed. #### 3. **Check for OBD-II Codes** - Connect an OBD-II scanner to the diagnostic port under the dashboard. - Check for any error codes related to the MAF sensor or air intake system. - Common codes include P0100 to P0104, which indicate MAF sensor issues. #### 4. **Testing the MAF Sensor Voltage** - Disconnect the MAF sensor connector. - Set your multimeter to measure voltage (DC). - Reconnect the sensor connector but back probe the connector so you can read the voltage without disconnecting it completely. - With the engine running, measure the voltage between the signal wire (usually colored wire, but refer to the vehicle's wiring diagram) and the ground wire. - A typical good MAF sensor should read between 0.5V to 1.0V at idle and increase with engine speed. - If the voltage is out of this range, the sensor might be faulty. #### 5. **Testing the Air Temperature Sensor (if integrated)** - Many MAF sensors also measure the intake air temperature. - Locate the temperature sensor pins (refer to the vehicle’s service manual). - Set your multimeter to measure resistance (Ohms). - Disconnect the MAF sensor and measure the resistance between the air temperature sensor pins. - Compare the resistance reading to the specifications provided in the service manual. - The resistance should change with temperature; if it doesn't, the sensor may be faulty. #### 6. **Cleaning the MAF Sensor** - If the MAF sensor appears dirty, you can try cleaning it with a specialized MAF sensor cleaner. - Remove the MAF sensor from the air intake assembly. - Spray the cleaner onto the sensor element, being careful not to touch it with your fingers or any tools. - Let the sensor dry completely before reinstalling. #### 7. **Recheck Performance** - After cleaning or replacing the MAF sensor, clear any error codes using the OBD-II scanner. - Start the vehicle and check for any returning codes or abnormal performance. - Take the vehicle for a test drive to ensure that it operates smoothly. ### Additional Tips - Ensure that the engine is cool before starting the inspection to avoid burns. - Use the correct tools to avoid damaging the sensor or its wiring. - If you replace the MAF sensor, use a high-quality part to ensure reliability. By following these steps, you should be able to diagnose and potentially resolve issues related to the MAF sensor and air mass temperature readings in your Land Rover 3.0 SDV6 / TDV6. If the problem persists, further diagnostic work may be required, possibly involving more advanced tools or professional assistance.
Mate thanks for the video 🫡, Just quick question, my disco 4 TDV6 3.0 , always serviced on time , so while I’m pulling our camper some how started leak coolant then overheated engine , has new AGM battery car won’t crank no click it just heard funny sound as it turn on like an electric motor similar to winch motor when u start it to pull something ? Oil level under full a bit oil cap smell bit burn Do You reckon engine gone 😢? Many thanks Matt
Hey Matt, glad you liked the video! Let's dive into your Discovery 4 issue. First off, it sounds like you've had a series of symptoms that might indicate some major issues, but let's look at each one to see if we can pinpoint the problem. Potential Causes and Diagnostic Steps: Coolant Leak and Overheating: The coolant leak and subsequent overheating could have caused engine components to overheat, potentially leading to head gasket damage, warped heads, or even internal engine damage. Overheating can sometimes damage the cylinder head or block, especially if it was severe. No Crank, No Click, Just a Whirring Sound: This sound is concerning. If it resembles an electric motor noise, the starter might be spinning but not engaging with the flywheel. In severe overheating cases, the engine could seize or develop a lack of compression, which prevents it from turning over normally. Oil Level and Burning Smell: If the oil level has dropped and the cap smells burnt, it’s possible the engine oil degraded due to overheating, leading to a burning smell. Lower-than-normal oil could also mean oil consumption, possibly from damaged internal seals or piston rings due to overheating. Suggested Diagnostic Steps: Check Engine Compression: Have a compression test done on each cylinder. If there's significantly low or no compression in one or more cylinders, the engine may have internal damage like piston ring failure or head gasket damage. Check Starter Motor and Connections: Ensure the starter motor is engaging properly with the flywheel. The whirring sound could mean the starter isn’t engaging fully, or the engine is indeed seized. Manually try turning the engine crankshaft with a breaker bar to see if it’s locked up. Scan for Diagnostic Codes: Use an OBD2 scanner to see if any relevant codes are stored in the ECU. Sometimes, codes related to overheating, cylinder misfire, or even coolant temperature can give clues. Inspect Coolant and Oil Condition: Check if there’s any coolant in the oil (milky appearance) or oil in the coolant, as these can be signs of a blown head gasket. Bottom Line If the engine won’t turn over manually and you have signs of a burnt smell with low oil, it’s possible the engine has seized or suffered significant internal damage. A complete teardown may be necessary to fully assess the damage, but hopefully, it’s something simpler like a starter issue. Let me know how it goes, and best of luck with the Discovery 4!
@@SanuMotorswithCharlie Thank you so very much for you quick reply brother you are a Fantastic person you are a LEGEND 💪🫡 , I couldn’t do all what u ask me to do because my work schedule I’ll do all in this weekend,, but I use my scanner ATOFIX pro it shows me that I have only two faults -1 DDM (Driver Door Module) -2 PCM (Powertrain Control Module) then under the rest it says no response . When I did the scan battery was 13.8 it’s new 4 weeks old. I use a long plastic cable tight as a snack to check between the oil filter and the oil cooler if there is oil spread because of the high temperature/pressure and I find all dry no oil leaks or trace all engine very clean nothing u find only the red coolant bit track , the water bottle have no trace of milky liquid or in the oil and front thermostat there is a trace of red coolant and on some pipes . That’s all what did this time, soon I let you know everything. I thank you again you are a blessing person and you share your knowledge to others and helping us all 🥹🙏🏻 Cheers for now Regards Matt 🫡
Thanks, Matt! I'm really glad I could help you out-you're putting in solid detective work here! Your scanner findings with only the DDM and PCM faults are useful info. The clean engine and lack of oil leaks around the oil filter and cooler area are good signs, and that trace of red coolant around the thermostat and pipes could point towards a minor coolant leak or seepage under high temps. Take your time over the weekend, and don’t hesitate to reach out if anything else pops up! Your attention to detail makes a big difference, so you’re already on the right track. Cheers, and best of luck with the rest of the checks! 🫡💪
@@SanuMotorswithCharlie Good day brother, I couldn’t have much time with car because was raining two days and car not on my driveway it’s off street, all I could do for now is I disconnect the battery for 5 minutes then I put back on so I can see if there will have same results on scanner or it will add another faults was add first - BCM (Body Control Module) Fault 3 second RLM (Ride Level Control Module) third and fourth was same faults from before,, then I managed at evening when rain stops for few hours I take the fan out and tried to crank manually by hand I used 21/22 socket and it cranked without any problems there is a normal resistance for a freely crank not seized or jammed , I crank it back words upwards can here compression some how like u know what I mean, then I changed the socket place two times and crank it for different positions was moved freely without any problems,,, now I will replace the top thermostat and replace the water reservoir with another one because I feel it’s faulty somehow they do pressure from the water hoses replace the bottom thermostat as well , but I don’t know after that what to do as might be won’t crank maybe crank shaft sensor gone and starter motor need replaced ? 🤷♂️ I don’t know,,, anyhow this what I found for this weekend until i can put on my driveway to do more research 🙏🏻💪🥳 Thank u so much again,,, I’ll wait your response 🫡🙏🏻💪 Cheers Matt
@@SanuMotorswithCharlie Hi I going Charli hope u well was waiting for your reply but it seems you busy I understand 🫡 New things find out the top thermostat was split damage and I checked the oil sump I checked it was at first came out a purely water about a big mug and then a dark black oil and smells burned it didn’t left the oily figure still oily,, It seems head gasket I’m in it now … Thank u Cheers Matt
Thanks for the video. I am looking to buy a code scanner/obd scanner for myself. Can you suggest the best one? And also, which make and model you are using in this video sir? Looking forward for your reply. Thanks ❤
I have 7 scanners. Some time one computer not enough for all jobs. How about your budget? Using business or personal purpose? My top coverage scanner launch x431 vll. IT’s cost me £4800.00 Thanks
@@SanuMotorswithCharlie Thank you so much for your reply. I want to use for my own personal use. The one which you quoted is very expensive. I am looking for an entry level scanner just to have an idea that what's going wrong.
Thanks for your feedback and for watching the video-I appreciate it! I’m glad you found the content helpful. Voiceovers can be a matter of personal preference, but I’ll keep your input in mind for future improvements to ensure the content is enjoyable for as many viewers as possible. Thanks again for sharing your thoughts, and feel free to reach out if you have any questions about the topic! 🚗🔧 #LandRover #MAFSensor #CarDiagnostics
I'm mechanic in Ghana and facing same problem help to solve it please
To test the MAF (Mass Air Flow) sensor for air mass temperature problems on a Land Rover 3.0 SDV6 / TDV6, you can follow these steps. This guide assumes you have a basic understanding of automotive diagnostics and access to necessary tools.
### Tools and Materials Needed
1. OBD-II scanner
2. Multimeter
3. Screwdrivers and pliers
4. Cleaning solution (if necessary)
5. Protective gloves
### Steps to Test the MAF Sensor
#### 1. **Locate the MAF Sensor**
- The MAF sensor is typically located between the air filter box and the throttle body.
- Consult the vehicle’s manual if you are unsure about its exact location.
#### 2. **Inspect the Sensor**
- Before testing, visually inspect the MAF sensor and its wiring for any obvious signs of damage, such as cracks, loose connections, or corrosion.
- Make sure the air filter is clean and properly installed.
#### 3. **Check for OBD-II Codes**
- Connect an OBD-II scanner to the diagnostic port under the dashboard.
- Check for any error codes related to the MAF sensor or air intake system.
- Common codes include P0100 to P0104, which indicate MAF sensor issues.
#### 4. **Testing the MAF Sensor Voltage**
- Disconnect the MAF sensor connector.
- Set your multimeter to measure voltage (DC).
- Reconnect the sensor connector but back probe the connector so you can read the voltage without disconnecting it completely.
- With the engine running, measure the voltage between the signal wire (usually colored wire, but refer to the vehicle's wiring diagram) and the ground wire.
- A typical good MAF sensor should read between 0.5V to 1.0V at idle and increase with engine speed.
- If the voltage is out of this range, the sensor might be faulty.
#### 5. **Testing the Air Temperature Sensor (if integrated)**
- Many MAF sensors also measure the intake air temperature.
- Locate the temperature sensor pins (refer to the vehicle’s service manual).
- Set your multimeter to measure resistance (Ohms).
- Disconnect the MAF sensor and measure the resistance between the air temperature sensor pins.
- Compare the resistance reading to the specifications provided in the service manual.
- The resistance should change with temperature; if it doesn't, the sensor may be faulty.
#### 6. **Cleaning the MAF Sensor**
- If the MAF sensor appears dirty, you can try cleaning it with a specialized MAF sensor cleaner.
- Remove the MAF sensor from the air intake assembly.
- Spray the cleaner onto the sensor element, being careful not to touch it with your fingers or any tools.
- Let the sensor dry completely before reinstalling.
#### 7. **Recheck Performance**
- After cleaning or replacing the MAF sensor, clear any error codes using the OBD-II scanner.
- Start the vehicle and check for any returning codes or abnormal performance.
- Take the vehicle for a test drive to ensure that it operates smoothly.
### Additional Tips
- Ensure that the engine is cool before starting the inspection to avoid burns.
- Use the correct tools to avoid damaging the sensor or its wiring.
- If you replace the MAF sensor, use a high-quality part to ensure reliability.
By following these steps, you should be able to diagnose and potentially resolve issues related to the MAF sensor and air mass temperature readings in your Land Rover 3.0 SDV6 / TDV6. If the problem persists, further diagnostic work may be required, possibly involving more advanced tools or professional assistance.
@@SanuMotorswithCharlie thank you boss but after I sprayed it still the restricted performance is still on.
And code it found is MAF sensors
Mate thanks for the video 🫡,
Just quick question, my disco 4 TDV6 3.0 , always serviced on time , so while I’m pulling our camper some how started leak coolant then overheated engine , has new AGM battery car won’t crank no click it just heard funny sound as it turn on like an electric motor similar to winch motor when u start it to pull something ? Oil level under full a bit oil cap smell bit burn Do You reckon engine gone 😢?
Many thanks
Matt
Hey Matt, glad you liked the video! Let's dive into your Discovery 4 issue.
First off, it sounds like you've had a series of symptoms that might indicate some major issues, but let's look at each one to see if we can pinpoint the problem.
Potential Causes and Diagnostic Steps:
Coolant Leak and Overheating:
The coolant leak and subsequent overheating could have caused engine components to overheat, potentially leading to head gasket damage, warped heads, or even internal engine damage. Overheating can sometimes damage the cylinder head or block, especially if it was severe.
No Crank, No Click, Just a Whirring Sound:
This sound is concerning. If it resembles an electric motor noise, the starter might be spinning but not engaging with the flywheel. In severe overheating cases, the engine could seize or develop a lack of compression, which prevents it from turning over normally.
Oil Level and Burning Smell:
If the oil level has dropped and the cap smells burnt, it’s possible the engine oil degraded due to overheating, leading to a burning smell. Lower-than-normal oil could also mean oil consumption, possibly from damaged internal seals or piston rings due to overheating.
Suggested Diagnostic Steps:
Check Engine Compression:
Have a compression test done on each cylinder. If there's significantly low or no compression in one or more cylinders, the engine may have internal damage like piston ring failure or head gasket damage.
Check Starter Motor and Connections:
Ensure the starter motor is engaging properly with the flywheel. The whirring sound could mean the starter isn’t engaging fully, or the engine is indeed seized. Manually try turning the engine crankshaft with a breaker bar to see if it’s locked up.
Scan for Diagnostic Codes:
Use an OBD2 scanner to see if any relevant codes are stored in the ECU. Sometimes, codes related to overheating, cylinder misfire, or even coolant temperature can give clues.
Inspect Coolant and Oil Condition:
Check if there’s any coolant in the oil (milky appearance) or oil in the coolant, as these can be signs of a blown head gasket.
Bottom Line
If the engine won’t turn over manually and you have signs of a burnt smell with low oil, it’s possible the engine has seized or suffered significant internal damage. A complete teardown may be necessary to fully assess the damage, but hopefully, it’s something simpler like a starter issue. Let me know how it goes, and best of luck with the Discovery 4!
@@SanuMotorswithCharlie
Thank you so very much for you quick reply brother you are a Fantastic person you are a LEGEND 💪🫡 ,
I couldn’t do all what u ask me to do because my work schedule I’ll do all in this weekend,, but I use my scanner ATOFIX pro it shows me that I have only two faults -1 DDM (Driver Door Module) -2 PCM (Powertrain Control Module) then under the rest it says no response .
When I did the scan battery was 13.8 it’s new 4 weeks old.
I use a long plastic cable tight as a snack to check between the oil filter and the oil cooler if there is oil spread because of the high temperature/pressure and I find all dry no oil leaks or trace all engine very clean nothing u find only the red coolant bit track , the water bottle have no trace of milky liquid or in the oil and front thermostat there is a trace of red coolant and on some pipes . That’s all what did this time, soon I let you know everything.
I thank you again you are a blessing person and you share your knowledge to others and helping us all 🥹🙏🏻
Cheers for now
Regards
Matt 🫡
Thanks, Matt! I'm really glad I could help you out-you're putting in solid detective work here!
Your scanner findings with only the DDM and PCM faults are useful info. The clean engine and lack of oil leaks around the oil filter and cooler area are good signs, and that trace of red coolant around the thermostat and pipes could point towards a minor coolant leak or seepage under high temps.
Take your time over the weekend, and don’t hesitate to reach out if anything else pops up! Your attention to detail makes a big difference, so you’re already on the right track. Cheers, and best of luck with the rest of the checks! 🫡💪
@@SanuMotorswithCharlie
Good day brother,
I couldn’t have much time with car because was raining two days and car not on my driveway it’s off street, all I could do for now is I disconnect the battery for 5 minutes then I put back on so I can see if there will have same results on scanner or it will add another faults was add first - BCM (Body Control Module)
Fault 3 second
RLM (Ride Level Control Module) third and fourth was same faults from before,, then I managed at evening when rain stops for few hours I take the fan out and tried to crank manually by hand I used 21/22 socket and it cranked without any problems there is a normal resistance for a freely crank not seized or jammed , I crank it back words upwards can here compression some how like u know what I mean, then I changed the socket place two times and crank it for different positions was moved freely without any problems,,, now I will replace the top thermostat and replace the water reservoir with another one because I feel it’s faulty somehow they do pressure from the water hoses replace the bottom thermostat as well , but I don’t know after that what to do as might be won’t crank maybe crank shaft sensor gone and starter motor need replaced ? 🤷♂️ I don’t know,,, anyhow this what I found for this weekend until i can put on my driveway to do more research 🙏🏻💪🥳
Thank u so much again,,,
I’ll wait your response 🫡🙏🏻💪
Cheers Matt
@@SanuMotorswithCharlie
Hi I going Charli hope u well was waiting for your reply but it seems you busy I understand 🫡
New things find out the top thermostat was split damage and I checked the oil sump I checked it was at first came out a purely water about a big mug and then a dark black oil and smells burned it didn’t left the oily figure still oily,,
It seems head gasket I’m in it now …
Thank u
Cheers
Matt
Excellent Charlie.I always look forward to all your Videos.They have helped me a lot! Wish I lived nearer to you .
Thank you very much. Nice to hear that. Need any changes please let me know. Also I start new channel
Called CLICK AND LEARN
Thanks again
Thanks for the video. I am looking to buy a code scanner/obd scanner for myself. Can you suggest the best one? And also, which make and model you are using in this video sir? Looking forward for your reply. Thanks ❤
I have 7 scanners. Some time one computer not enough for all jobs.
How about your budget? Using business or personal purpose?
My top coverage scanner launch x431 vll. IT’s cost me £4800.00
Thanks
@@SanuMotorswithCharlie Thank you so much for your reply. I want to use for my own personal use. The one which you quoted is very expensive. I am looking for an entry level scanner just to have an idea that what's going wrong.
Good work but regret the voice over is far too "Indian".
Thanks for your feedback and for watching the video-I appreciate it! I’m glad you found the content helpful. Voiceovers can be a matter of personal preference, but I’ll keep your input in mind for future improvements to ensure the content is enjoyable for as many viewers as possible.
Thanks again for sharing your thoughts, and feel free to reach out if you have any questions about the topic! 🚗🔧 #LandRover #MAFSensor #CarDiagnostics