This fault code 528 DTCs document is a troubleshooting manual for the alternate torque signal circuit on Cummins ISB CM550 DTC coverage. It explains the PID P093, SPN 093, FMI 2 fault, the alternate switched torque curve switch circuit, and the checks used to confirm whether the switch, OEM harness, or ECM connector area is at fault.
Official fault code 528 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB CM550 |
| System/Group | ISB CM550 (1990-94) / DTCs; Alternate Torque Signal Circuit |
| Year/Revision | Unknown |
| Pages | 4 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- FAULT CODE: 528
- PID: P093
- SPN: 093
- FMI: 2
- ALTERNATE (SWITCHED) TORQUE CURVE SWITCH CIRCUIT
- Alternate Torque Signal Circuit
- DESCRIPTION
- COMPONENT LOCATION
- TROUBLESHOOTING STEPS
- Step 1A: Inspect the OEM harness and ECM connector pins
- Step 1B: Check for an open circuit
- Step 1C: Check for a short circuit to ground
- Step 1D: Check for a short circuit from pin to pin
- Step 2A: Inspect OEM switch pins
- Step 2B: Check resistance in position 2
- Step 2C: Check resistance in position 3
- Step 3A: Disable the fault code and verify inactive status
- Step 3B: Clear inactive fault codes using the diagnostic tool
Applicable truck models
This file applies to Cummins ISB CM550 engines in the ISB CM550 (1990-94) / DTCs group where the OEM provides an alternate switched torque curve switch circuit. The document states that component location varies with each OEM and equipment model, so the OEM manual must be used for the exact torque curve switch location. For manufacturer information, visit Cummins official website.
Who needs this fault code 528 DTCs manual
Workshop technicians, fleet mechanics, and diagnostic tool users need this code 528 DTCs manual when checking the alternate torque signal circuit, OEM harness, switch positions, and pin 39 resistance values. It is most useful after the service tool shows the fault active or when the switch state does not match expected open, closed, or 1500-ohm resistance behavior.
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