Deutz-Fahr 190 – ECM: Speed Signal from Cam-Shaft Bad or Missing

The Engine Control Module (ECM) has detected an erratic, implausible, or absent signal from the camshaft position sensor. This sensor provides critical data regarding the camshaft's position and rotational speed, which is necessary for synchronizing fuel injection and ignition timing. A loss of this signal can result in significant engine performance issues, including difficult or impossible starting, as the engine attempts to run using only the crankshaft signal as a backup.

• Agrotron
• TCD 2013
• BFM 1013
• TCD 2.9
• TCD 3.6

1. 1

   Use a diagnostic scan tool to confirm SPN 190 and look for accompanying FMI codes (8, 11, or 12) or DEUTZ error codes (76 or 78).

2. 2

   Inspect the wiring harness and connectors leading to the camshaft position sensor for abrasion, pinch points, heat damage, corrosion, or oil contamination.

3. 3

   Visually inspect the sensor for physical damage and check the timing pickup ring (tone wheel) on the camshaft gear for dirt, debris, or damaged teeth.

4. 4

   Verify the air gap between the sensor and the tone wheel is correct and that the sensor is securely mounted.

5. 5

   Test the sensor signal using a multimeter (check for 200-1,000 ohms resistance or fluctuating AC voltage while cranking) or an oscilloscope (look for a clean square wave pattern).

1. 1

   Prepare machine

   Park the machine on a level surface, engage the parking brake, allow the engine to cool completely, and disconnect the negative battery terminal.

2. 2

   Locate and access sensor

   Locate the camshaft position sensor on the cylinder head, near the valve cover, or on the timing cover (location varies by engine, e.g., under the injection pump on TCD 2.9). Remove any obstructions like the air filter housing if necessary.

3. 3

   Remove old sensor

   Press the release tab to disconnect the electrical connector. Remove the single mounting bolt, then gently twist and pull the sensor from the engine block. Ensure the old O-ring does not fall into the engine.

4. 4

   Install new sensor

   Compare the new sensor to the old one to ensure they match. Lightly lubricate the new sensor's O-ring with clean engine oil. Carefully insert the sensor into the mounting hole, press it into place, and tighten the mounting bolt to the manufacturer's specified torque. Do not overtighten.

5. 5

   Reassemble and test

   Reconnect the electrical connector until it clicks, reconnect the negative battery terminal, clear the fault codes with a diagnostic tool, and start the engine and let it idle to confirm the repair.