Deutz-Fahr 616 – ECU (EMR3, EMR4 (EDC17), MD1): Camshaft Speed Sensor Special Instructions

The Engine Control Unit (ECU) has detected a specific, non-standard condition with the camshaft speed sensor, which monitors the rotational position and speed of the camshaft for fuel injection and ignition timing synchronization. This "Special Instructions" fault (FMI 14) typically indicates signal implausibility, synchronization problems with the crankshaft sensor, or complex electrical faults such as out-of-phase signals or abnormal signal patterns. This malfunction can lead to hard starting, engine misfires, reduced power, stalling, and increased fuel consumption.

• Series 6 (6155, 6175, 6215)
• Series 6.4 (6160.4, 6170.4)
• Series 6G
• Genie lifts

1. 1

   Use a diagnostic scanner to read fault codes and check for related crankshaft sensor (SPN 190) or power supply faults

2. 2

   Visually inspect the camshaft position sensor, electrical connector, and wiring harness for cracks, melting, corrosion, or loose connections

3. 3

   Trace the wiring harness from the sensor to the ECU, looking for chafing, cuts, or routing too close to high-voltage cables or hot exhaust components

4. 4

   Identify if the sensor is a 2-wire (Variable Reluctance) or 3-wire (Hall-Effect) type to determine the correct electrical test

5. 5

   For 3-wire sensors: With ignition ON (engine OFF), check for a 5V reference voltage and good ground. While cranking, verify a fluctuating DC voltage on the signal wire

6. 6

   For 2-wire sensors: Measure resistance across the sensor pins (should be 200-1,000 Ohms). While cranking, back-probe to verify a small, fluctuating AC voltage

1. 1

   Prepare machine for service

   Park the machine on a level surface, engage the parking brake, and disconnect the negative battery terminal to prevent electrical shorts.

2. 2

   Locate the sensor

   Find the camshaft position sensor on the cylinder head, valve cover, or front timing cover near the camshaft gear (e.g., 'Speed transmitter via camshaft' on TCD 3.6 L4).

3. 3

   Remove the old sensor

   Disconnect the electrical connector, remove the single mounting bolt (typically 8mm or 10mm), and gently twist and pull the sensor out of its bore. Carefully pry with a flathead screwdriver if stuck, avoiding damage to the housing.

4. 4

   Inspect and clean

   Check the old sensor's tip for metal debris or physical damage. Clean the sensor mounting surface and the bore with a clean rag.

5. 5

   Install the new sensor

   Lightly lubricate the new sensor's O-ring with clean engine oil. Press it firmly into the bore, tighten the mounting bolt to manufacturer specification, and reconnect the electrical connector securely.

6. 6

   Finalize repair

   Reconnect the negative battery terminal, use a diagnostic tool to clear all fault codes, and start the engine to confirm the fault does not reappear. Perform a test drive or operate the machine to ensure the issue is resolved.