Yale 190-8 – Engine Control Module (ECM) / Engine ECU: Crank/CAM Synchronization

This code indicates that the engine speed signal is abnormal but still within a functional range, meaning the camshaft and crankshaft are not properly in time with each other, or the engine control module is receiving fluctuating/erratic signals from the cam or crank sensors. Symptoms typically include a "Cranks, No Start" condition or a complete loss of RPM readings.

• Yale and Hyster Forklifts
• Yale GLP040VX
• Veracitor series
• Fortis series

1. 1

   Check the timing belt for proper tension, damage, or missing teeth.

2. 2

   Check the air gap between the Cam Sensor and the Cam Reluctor Wheel (especially critical on Kubota diesel engines).

3. 3

   Check the Cam Reluctor Wheel (tone ring) for proper installation, orientation, dirt, or damage.

4. 4

   Inspect the crankshaft and camshaft speed sensor connectors for looseness, corrosion, or open/shorted circuits.

5. 5

   Inspect the sensor housing for dust or debris that could be interfering with the magnetic pulse.

6. 6

   Run diagnostic live data to observe the real-time RPM signal for erratic fluctuations caused by electrical noise or voltage instability.

1. 1

   Access the Timing Components

   Gain access to the front of the engine to inspect the timing belt and sensor housings.

2. 2

   Clean the Sensors

   Remove the engine speed sensors (cam and crank) and clean the sensor tips and the tone ring to ensure no debris is blocking the signal.

3. 3

   Verify Timing

   Check the mechanical timing of the engine. If the timing belt is loose, damaged, or missing teeth, it must be replaced and the engine re-timed.

4. 4

   Adjust Air Gap

   If the engine uses an adjustable sensor bracket (like Kubota diesels), measure and set the correct air gap between the sensor and the reluctor wheel.

5. 5

   Replace Faulty Sensors

   If the wiring is secure, the timing is correct, and the RPM readings remain erratic on your diagnostic tool, replace the camshaft and/or crankshaft position sensors.

6. 6

   Clear and Test

   Clear the 190-8 fault code from the ECM and run the forklift under load and at idle to verify smooth RPMs and ensure the code does not return.