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post #2 of (permalink) Old 31-10-2013, 18:07
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Join Date: Feb 2009
Location: Bristol
Car: Rover 620Ti, 12 psi boost.
Posts: 6,794
The cars are still running well, despite the sensor failures, because the MEMS ECU implements back-up values for the failed sensors. A back-up value is provided for the coolant temperature sensor, inlet air temperature sensor and manifold absolute pressure sensor.

Back-up values:
Coolant temperature sensor 60 C
Inlet air temperature sensor 35 C
Manifold Absolute Pressure sensor. The ECU implements air fuel ratio relating to engine speed and throttle position.

Due to this ECU back-up ability, for some of the sensors, you might not be aware that some sensors are not working unless you use diagnostics equipment.

That T-300 is a useful tool to have.

I have a question, with a non functioning crank position sensor, shouldn't the car not be able to start?

Last edited by denis747; 31-10-2013 at 18:23.
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