SPN 93 - FMI 2 (Fault Code 528)

SPN 93 - FMI 2 (Fault Code: 528)
Alternate Torque Circuit

PID(P), SID(S): P093
SPN: 93
FMI: 2

REASON: Auxiliary Alternate Torque Validation Switch - Data Erratic, Intermittent, or Incorrect. An error has been detected in the alternate torque switch circuit.

EFFECT: Torque curve setting defaults to default curve.

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.

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.

Read More:
SPN 98 - FMI 4 (Fault Code 499)
SPN 105 - FMI 16 (Fault Code 488)


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