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.