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Auxiliary Input/Output 3 Circuit – Voltage Above Normal or Shorted to High Source
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 529 PID: S051 SPN: 703 FMI: 3 LAMP: Amber SRT: |
Auxiliary Input/Output 3 Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage has been detected at the auxiliary input/output 3 circuit. |
None on performance. |
 Dual Output Signal
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Circuit Description
The electronic control module (ECM) provides a signal to the original equipment manufacturer (OEM) output control solenoid to turn the OEM supplied accessory on and off. The OEM output control circuit varies by OEM. Some OEMs will use a solenoid return that is wired to the ECM or will use a return that goes to engine block or chassis ground.
Component Location
The OEM output solenoid location varies by OEM. Refer to the appropriate OEM troubleshooting and repair manual to determine the location.
Shop Talk
Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe® Online for applicable fixes to the calibration stored in the ECM. If necessary, recalibrate the ECM. Refer to Procedure 019-032 (ECM Calibration Code) in Section 19 in the corresponding Troubleshooting and Repair Manual for the engine being serviced.
The ECM monitors the voltage level on this circuit. When the ECM commands the OEM output signal low, it expects the voltage level to be approximately 0-VDC. If it detects a high voltage, this fault is recorded. If Fault Code 529 is still active after completing the following troubleshooting steps, refer to the OEM troubleshooting and repair manual for procedures to check the OEM output device for an open circuit or short circuit to ground. Possible causes of this fault include:
- Open circuit in the engine harness or OEM output control solenoid
- Short circuit to voltage source in the OEM harness
- Malfunctioning ECM.
Refer to Troubleshooting Fault Code t05-529
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