diablos_carcv5 Posted February 19, 2024 Share Posted February 19, 2024 Greetings, everybody. I own a Range Rover Sport SDV6 3.0L diesel vehicle, and we just fixed the engine due to a broken crankshaft. Upon starting the engine, it stalls and displays a limited performance notice on the dashboard along with smoke. The diagnostic report indicates a defective MAP sensor or a lack of MAP sensor detection. We inspected the plug and found no voltage reaching the map sensor plug. We next examined the ECU pins connected to the map sensor plug and confirmed the presence of ground and power, but no signal. We removed the ECU and submitted it for repair, but they reported that there are no problems with it. Is it necessary to replace the ECU, or is there a component that is not visible causing the confusion? If anybody has any ideas, I would appreciate the assistance. Thank you in advance. Quote Link to comment Share on other sites More sharing options...
NAVITEL Posted February 19, 2024 Share Posted February 19, 2024 Additionally, consider visiting the UK site where there is a larger number of diesel owners. https://www.rrsport.co.uk/forum/index.php Quote Link to comment Share on other sites More sharing options...
blueWING007 Posted February 19, 2024 Share Posted February 19, 2024 Examine the cabling between the ECU and MAP sensor if the sensor is not receiving electricity. The signal originates from the Manifold Absolute Pressure (MAP) sensor, not the Engine Control Unit (ECU), indicating that the ECU is functioning properly. There may be a faulty connection, ground, or wire causing the issue. Quote Link to comment Share on other sites More sharing options...
diablos_carcv5 Posted February 19, 2024 Author Share Posted February 19, 2024 Thank you for responding. We are checking the cables from the map sensor socket back to the ECU since there is no electricity reaching the map sensor. There are three pins: power, ground, and signal. The power and ground connections are OK, but there is no power in the signal line. Quote Link to comment Share on other sites More sharing options...
migueldosantos77 Posted February 19, 2024 Share Posted February 19, 2024 This is incomprehensible. You are stating that there is no voltage reaching the map sensor, while the power and ground connections are functioning properly. Which power is acceptable? Quote Link to comment Share on other sites More sharing options...
migueldosantos77 Posted February 19, 2024 Share Posted February 19, 2024 Contact the repair centre that received the ECU. Inquire about the absence of electricity from the ECU to the MAP sensor despite the ECU being functional. Quote Link to comment Share on other sites More sharing options...
EtherealWanderer Posted February 19, 2024 Share Posted February 19, 2024 I am unsure about how the signal wire operates. How can I test the voltage resistance of such item? Quote Link to comment Share on other sites More sharing options...
blueWING007 Posted February 19, 2024 Share Posted February 19, 2024 The ECU supplies power to the sensor and receives the signal back from the sensor. Quote Link to comment Share on other sites More sharing options...
blueWING007 Posted February 19, 2024 Share Posted February 19, 2024 If there is power and ground at the sensor but no signal, it is likely that the sensor is malfunctioning. We received a 3.0 TDV6 L320 with an engine swap that was found to have a faulty MAP sensor. Rare occasion of encountering a faulty sensor. Quote Link to comment Share on other sites More sharing options...
EtherealWanderer Posted February 19, 2024 Share Posted February 19, 2024 Indeed, it seems so. I am anticipating a replacement, and I will provide the news here. Quote Link to comment Share on other sites More sharing options...
EtherealWanderer Posted February 19, 2024 Share Posted February 19, 2024 Update: Issue resolved, it was a defective MAP sensor. Substituted and functioning well. Thank you everyone for your assistance. Quote Link to comment Share on other sites More sharing options...
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