No-start issue on OM651 diesel — P0341 CKP/CMP , strange behavior
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No-start issue on OM651 diesel — P0341 CKP/CMP , strange behavior
Hi all,
I'm dealing with a puzzling no-start situation on an Infiniti Q50 fitted with the Mercedes OM651 diesel engine and hoping someone here has seen something similar.
The symptoms: The engine cranks but will not fire. Pulling fault codes gives a P0341 — crankshaft position sensor signal out of range or out of sync with the camshaft sensor.
The strange part: When I physically disconnect the crankshaft position sensor, the engine starts and runs. The moment it's plugged back in, no start.
This points to a signal conflict rather than a simple sensor failure — the ECU seems to be getting confused by what the CKP is reporting rather than helped by it.
What I've checked so far:
The issue came after replacing the clutch and flywheel...
Any leads appreciated.
Morgan
I'm dealing with a puzzling no-start situation on an Infiniti Q50 fitted with the Mercedes OM651 diesel engine and hoping someone here has seen something similar.
The symptoms: The engine cranks but will not fire. Pulling fault codes gives a P0341 — crankshaft position sensor signal out of range or out of sync with the camshaft sensor.
The strange part: When I physically disconnect the crankshaft position sensor, the engine starts and runs. The moment it's plugged back in, no start.
This points to a signal conflict rather than a simple sensor failure — the ECU seems to be getting confused by what the CKP is reporting rather than helped by it.
What I've checked so far:
- Replaced both the crankshaft and camshaft position sensors — problem unchanged
- Sensor wiring continuity — within spec
- No obvious damage to the reluctor ring
- No other fault codes active
The issue came after replacing the clutch and flywheel...
Any leads appreciated.
Morgan
Out Of Control!!
Joined: Apr 2019
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From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
freshly upset flywheel
Hi all,
I'm dealing with a puzzling no-start situation on an Infiniti Q50 fitted with the Mercedes OM651 diesel engine and hoping someone here has seen something similar.
The symptoms: The engine cranks but will not fire. Pulling fault codes gives a P0341 — crankshaft position sensor signal out of range or out of sync with the camshaft sensor.
The strange part: When I physically disconnect the crankshaft position sensor, the engine starts and runs. The moment it's plugged back in, no start.
This points to a signal conflict rather than a simple sensor failure — the ECU seems to be getting confused by what the CKP is reporting rather than helped by it.
What I've checked so far:
The issue came after replacing the clutch and flywheel...
Any leads appreciated.
Morgan
I'm dealing with a puzzling no-start situation on an Infiniti Q50 fitted with the Mercedes OM651 diesel engine and hoping someone here has seen something similar.
The symptoms: The engine cranks but will not fire. Pulling fault codes gives a P0341 — crankshaft position sensor signal out of range or out of sync with the camshaft sensor.
The strange part: When I physically disconnect the crankshaft position sensor, the engine starts and runs. The moment it's plugged back in, no start.
This points to a signal conflict rather than a simple sensor failure — the ECU seems to be getting confused by what the CKP is reporting rather than helped by it.
What I've checked so far:
- Replaced both the crankshaft and camshaft position sensors — problem unchanged
- Sensor wiring continuity — within spec
- No obvious damage to the reluctor ring
- No other fault codes active
The issue came after replacing the clutch and flywheel...
Any leads appreciated.
Morgan
How is the special notch identifier set in relation to engine TDC1 ?
The flywheel is not all identical teeth... there's a patern the ECU syncs with camshaft position.
Nothing points to bad/open wiring harness only bad timings to sync your diesel injectors.
🤞
