Troubleshooting Guide for Deutz EM3 Error Code 12/91/APP1

Fault Description: Throttle 1

This error relates to the analog accelerator pedal sensor (1) or a dual accelerator pedal sensor. The voltage measured by the ECU is outside the acceptable range, or the calculated pedal position conflicts with the position of the second pedal sensor.

Preparations:

Deutz Diagnostic Kit DECOM for Deutz Engine
2023 Deutz Serdia2010 v14.1.9.1 Diagnostic Software Free Download

Error Code Details

• DEUTZ Error Code: 12
• Blink Code: 2 – 2 – 6 (short-long-short)
• SPN: 91

FMI (Failure Mode Indicator):

1. FMI 3: Voltage too high or short circuit to +Ubatt
2. FMI 4: Voltage too low or short circuit to -Ubatt
3. FMI 12: Error mode cannot be recognized
4. FMI 2: Data stream is defective

Error Detection

• The error lamp remains continuously lit.
• Entry is logged in the error memory.

Possible Causes

• Voltage outside the expected range.
• Inconsistent signal compared to the redundant pedal sensor.
• Sensor failure.
• Damaged connecting cables.

Corrective Measures

1. Inspect the Wiring:
   • Look for damage, corrosion, or loose connections.
   • Repair or replace any compromised sections.
2. Check the Accelerator Pedal Sensor:
   • Test the voltage range to ensure it falls within specifications.
   • Verify the signal consistency between redundant sensors (if applicable).
3. Replace Faulty Components:
   • Replace the sensor if it is found defective.
   • Replace or repair the connecting cables if needed.

System Reaction

• The system triggers a warning.
• It may switch to an alternative value based on the priority chain or enter a “limp home” mode.

Error Lamp Behavior

• Continuously lit.

Self-Healing

• No: The error must be manually corrected.

Signal Priority

• Priority Level: 4

For more repair case of Deutz engine,please refer to:Deutz Engine Repair