Ray climbed onto the step plate. The operator, a kid named Elias, looked pale. "It just stopped, Ray. Mid-lift. I didn't hit anything."
| Common Cause | Detailed Explanation | Solution | | :--- | :--- | :--- | | | The sensor, often a Hall effect sensor, may have failed. Internal drift, cold solder joints, or a broken track can cause it to send a continuous signal. | Inspect the pedal sensor and wiring harness. If faulty, the entire pedal assembly may need replacement. | | ⚠️ Mechanical Obstruction | A physical object (e.g., a floor mat, debris, ice in cold storage) might be pressing against the pedal, or the pedal's pivot could be jammed, preventing full return to the 'zero' position. | Remove any obstruction and ensure the pedal moves freely and springs back to its upright position. | | ⚡ Electrical Issues | A broken wire, loose connector, short to ground, or corrosion in the wiring harness can send a stray 'active' voltage to the controller. | Inspect the wiring harness from the pedal to the main controller for any signs of damage, wear, or loose connections. | | 💻 Controller Malfunction | In rarer cases, the analog-to-digital (A/D) converter input on the main controller responsible for reading the pedal signal could be faulty. | Advanced diagnostics with dealer-level software like Jungheinrich's JUDIT-4 are required to test the controller's inputs. |
"I need electrical tape and a razor blade," Ray shouted to Elias. "From the maintenance cart!"
What is the of your Jungheinrich truck (e.g., EFG, ETV, EJE)? Jungheinrich Error Code 1901
If the error persists even when your foot is off the pedal, there may be a technical issue:
stands for "Drive pedal activated during startup" .
Sometimes, an issue with a related switch can trick the system into behaving like Error 1901. Ray climbed onto the step plate
| Sub-Code | Meaning | | :--- | :--- | | | Signal voltage too low (sensor short to ground) | | 1901-2 | Signal voltage too high (sensor open circuit or broken wire) |
When Error 1901 becomes active, the forklift will typically exhibit one or more of the following behaviors:
: Activation of the drive pedal while the parking brake is still engaged. Mid-lift
Ensure that no objects (such as clipboards, floor mats, or debris) are resting against the drive pedal.
: Turn the key to the 'Off' position, ensure the pedal is in its neutral position, and then turn the machine back on.
Troubleshooting Jungheinrich Error Code 1901: Drive Pedal Activation During Startup
The pedal linkage, spring, or return mechanism is worn, damaged, or dirty, preventing the pedal from returning to the absolute "neutral" position.