UIC 000974.02 – Hand Throttle Potentiometer, Voltages at Channel 1 and Channel 2 Not in the Correct Ratio

UIC 000974.02 (UIC 974.02)

Code: 000974.02

Shortcode: 974.02

Description:

This diagnostic trouble code (DTC) UIC 000974.02 is triggered when the control unit detects a mismatch between the output signals of the hand throttle potentiometer (B78). The voltage at channel 1 (lead 6077) must be double the voltage of channel 2 (lead 6036).

Reaction:

When this error occurs, the control unit may limit throttle response or activate a fail-safe mode to ensure vehicle safety and prevent potential damage.

Recommendations:

  • Inspect Throttle Potentiometer Connections:
    • Check the wiring connections at the hand throttle potentiometer for any loose, damaged, or corroded connectors.
    • Measure the output voltages at channel 1 (lead 6077) and channel 2 (lead 6036) to confirm the discrepancy.
  • Verify Voltage Ratios:
    • Ensure that the voltage at channel 1 is exactly double the voltage at channel 2. If the ratio is incorrect, recheck the wiring and sensor.
  • Replace Hand Throttle Potentiometer:
    • If the wiring and connections are intact and the voltage ratio remains incorrect, consider replacing the hand throttle potentiometer (B78).
  • Consult Technical Support:
    • If the issue persists, contact John Deere technical support for further assistance and potential software updates.

Note:

  • Intermittent faults in the wiring or connectors can cause voltage mismatches. Ensure a thorough inspection to avoid repeat occurrences.
  • Keeping a log of error code occurrences and the conditions under which they happen can help in diagnosing intermittent issues.

Control Units: John Deere