In this episode, we repair a defect crankshaft position sensor and trigger wheel on a 2009 Land Rover Discovery 3 with a 2.7L TDV6 engine. The vehicle runs only in limp mode and throws a P0336-66 fault code.
Also check out his video with a similar repair.
• No Engine Start after ...
Technical data:
Trigger wheel and sensor install of 2.7L TDV6 and 3.0L SDV6 engine:
Offset of trigger wheel from dowel location to trigger wheel hole is 110.5° CW when viewed in driving direction from back side of engine.
Insertion dept of the trigger wheel is 3.66 mm +-0.4 mm with max axial TIR of 0.4 mm, measured from the shoulder of the crank to the trigger wheel.
The sensor gap is 0.4 mm to 1.5 mm max.
The trigger wheel delivers 60 - 2 tooth pattern. The missing theeth represent 12° of crankshaft rotation. The reference point is 21° BTDC.
See our Patreon Page for a screen shot of the correct shape of the trigger wheel signal.
Note that the crankshaft sensor uses a 5V supply and ground and provides a output signal connected to a 4.7 k Ohm pull up resistor inside the ECU. If measured in a test setup without the pull up resistor, the output voltage is less and looks wrong. Install a 4.7K Ohm resistor to see the correct output.
Connect the scope to the wiring harness above the LH ECR Valve to get the crankshaft sensor signal:
Ground = Brown with red tracer
Signal = White with red tracer
+5V = Yellow with red tracer
Note that some color combinations are present multiple times in the harness.
ECU will only trigger a fault once the engine starts. No-start no-fault. Engine must also read the cam shaft sensor and will take one crankshaft revolution to sync. If no cam shaft signal is present or faulty, engine will remain in limp mode with reduced power and fault will be logged by the ECU.
Part number of trigger wheel: LR005254 (Price at LR in 10-2023 was 156 Euro)
Part Number Bosch Sensor: BOSCH 0986280437
Contact Vera if you have more questions (Patreons only please).
We are not liable for any harm you do to your car, your engine, your surroundings or yourself. Use the information given in this video at your own risk.
Thanks for watching,
Vera & Christian
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/ lrtime
16 дек 2023
