Manitou A203EC – MP1: Accelerator Inconsistency

The MP1 computer has detected an inconsistency in the signals from the electronic accelerator pedal. Modern electronic pedals use dual independent sensors (potentiometers) to translate physical position into electrical signals. This fault is logged if the signals do not match their pre-defined relationship, or if one of the signals is intermittent, out of its expected voltage range, or does not change smoothly as the pedal is depressed.

• MT-X 1440
• MT-X 1840
• MT
• MLT
• MLT-X
• ML

1. 1

   Visually inspect the accelerator pedal assembly, its connector, and the wiring harness (including foot throttle harness) for physical damage, corrosion, chafing, or loose connections.

2. 2

   With the ignition OFF, disconnect the pedal connector. Turn ignition ON and check for a 5-volt reference supply at the harness connector pins.

3. 3

   With the ignition OFF, check for low resistance continuity to ground from the ground pins on the harness connector to a known good chassis ground.

4. 4

   Reconnect the pedal and back-probe the signal wires. Turn ignition ON (engine off) and verify Signal A voltage increases smoothly from approximately 0.5V to 4.5-4.7V as the pedal is pressed, without dropouts or spikes.

5. 5

   Verify Signal B voltage increases smoothly across its expected range (e.g., 0.3V to 2.5V) without sudden drops or dead spots.

1. 1

   Prepare machine

   Ensure the machine is turned off and the key is removed.

2. 2

   Disconnect pedal

   Disconnect the electrical connector from the accelerator pedal assembly.

3. 3

   Remove pedal assembly

   Remove the bolts or screws that secure the pedal assembly to the floor or mounting bracket.

4. 4

   Install new pedal

   Install the new accelerator pedal assembly and secure it with the mounting hardware, then reconnect the electrical connector.

5. 5

   Recalibrate pedal

   If required, perform a recalibration by turning the ignition on and slowly depressing the pedal from idle to full throttle three times to allow the ECM to learn the new voltage range.