This Cummins fault 528 document is a troubleshooting manual for the ISB6.7 CM2150 alternate torque switch circuit. It explains Fault Code 528, PID P093, SPN 93, FMI 2, the amber lamp condition, and the default torque curve effect. The file is written for technicians using INSITE™ electronic service tool and standard multimeter checks.
Official Cummins fault 528 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2150 (2007-09) |
| System/Group | DTCs; Alternate Torque Circuit; Auxiliary Alternate Torque Validation Switch |
| Publication no. | Not shown in the extract |
| Year/Revision | Last Modified: 20-Jul-2010 |
| Pages | 12 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Shop Talk
- FAULT CODE 528
- Alternate Torque Circuit
- Associated Procedures
- Troubleshooting Steps
- Guided Step 1 – Check the fault codes.
- Guided Step 2 – Check the OEM switch circuit.
- Guided Step 3 – Check the electronic control module (ECM) and OEM harness.
- Guided Step 4 – Clear the fault code.
Applicable truck models
This manual applies to Cummins ISB6.7 CM2150 engines from the 2007-09 coverage group where the OEM provides a two-position or three-position torque curve switch. The extract states that component location varies by OEM and equipment model, so connector access and switch placement must be checked in the OEM troubleshooting and repair manual. For manufacturer information, visit Cummins official website.
Who needs this Cummins fault 528 manual
Workshop owners, diesel mechanics, and fleet technicians need this Cummins fault 528 manual when the ECM reports “Auxiliary Alternate Torque Validation Switch – Data Erratic, Intermittent, or Incorrect.” It supports diagnosis of inactive or intermittent faults, OEM switch condition, ECM connector pins, pin-to-pin shorts, pin-to-ground shorts, open circuits, and final fault clearing.
The procedure identifies the switch states used by the alternate torque circuit. A three-position switch can be open, closed, or 1500 ohm resistance; a two-position switch can be open or closed. If INSITE™ shows the switch changing state correctly, the fault is not in the switch circuit. The guide then moves through connector inspection, harness resistance checks, and repair direction for damaged pins, moisture, missing seals, dirt, insulation damage, broken connector shells, or damaged locking tabs.
Electrical checks in the extract use resistance limits of greater than 100K ohms for short-circuit checks and less than 10 ohms for an open-circuit check across the OEM harness. Repair actions point to OEM Wiring Harness procedure 019-071, connector and pin inspection procedure 019-361, resistance measurement procedure 019-360, and ECM calibration code procedure 019-032 where calibration issues may apply.
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