This guide explains how to diagnose and repair Deutz EMR3 trouble code 78 / SPN 190, which indicates that the crankshaft and camshaft speed sensor signals are out of phase. This fault prevents the engine from starting and requires inspection of sensor alignment, wiring, or sensor wheel installation.
Related resources:
- Deutz EMR3
- Deutz DECOM
- 2023 Deutz Serdia 4.0 / Serdia 2010 v14.1.9.1 Diagnostic Software
- Deutz Serpic EPC Parts Catalogue (2012–2014)
Error Code Details
- DEUTZ Error Code: 78
- Blink Code (short–long–short): 2 – 1 – 3
- SPN: 190
- FMI:
- 2 – Data stream defective (signal not plausible)
When this fault occurs, the warning lamp remains ON continuously, and the error is stored in memory.
What the Error Means
The EMR3 control unit detects that the crankshaft and camshaft speed sensor signals do not match the expected timing relationship. This usually points to a mechanical or wiring issue affecting the synchronization between the two sensors.
Possible Causes
- Crankshaft and camshaft signals are phase-shifted / not synchronized
- Sensor wheel installed in the wrong position
- Incorrect sensor polarity or wiring order
- Damaged or misaligned sensor wheel
- Faulty crankshaft or camshaft speed sensor
Recommended Repair Steps
- Check sensor wheel alignment
- Verify the crankshaft sensor wheel and camshaft sensor wheel are installed in the correct position.
- Correct if misaligned.
- Inspect sensor polarity
- Make sure the crankshaft and camshaft sensors are wired with correct polarity.
- Check wiring and connectors
- Look for damaged wiring, loose pins, corrosion, or incorrect routing.
- Repair or replace as needed.
- Verify sensor gap and mounting
- Ensure the sensors have the correct air gap to the target wheel.
- Tighten or adjust mounting if necessary.
- Inspect sensor wheel condition
- Look for bent, missing, or damaged teeth.
System Behavior
- Engine Start: Not possible
- Warning Lamp: Permanently illuminated
- Self-Healing: None
- Signal Priority: 4
For more Deutz diagnostic and troubleshooting topics, see: Deutz Trouble Repair.