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Auxiliary Alternate Torque Validation Switch – Data Erratic, Intermittent, or Incorrect
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 528 PID: P093 SPN: 93 FMI: 2 LAMP: Amber SRT: |
Auxiliary Alternate Torque Validation Switch – Data Erratic, Intermittent, or Incorrect. An error has been detected in the alternate torque switch circuit. |
Torque curve setting defaults to default curve. |
 Alternate Torque Circuit
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Circuit Description
The torque curve switch circuit allows the operator to select from up to three preprogrammed torque curves using a two- or three-position switch, depending on which one the original equipment manufacturer (OEM) has provided.
Component Location
The location of the torque curve switch circuit varies with each OEM and equipment model. Refer to the OEM troubleshooting and repair manual.
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 switch can be monitored for proper operation with INSITE™ electronic service tool. If the switch is changing state correctly on the service tool, then the problem does not lie in the switch circuit.
The 3-position switch has three states:
- Position 1 – open
- Position 2 – closed
- Position 3 – 1500 ohm resistance.
The 2-position switch has two states:
- Position 1 – open
- Position 2 – closed.
Refer to Troubleshooting Fault Code t05-528
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