M11 code 432 ISS is the Cummins troubleshooting document for the Accelerator Pedal Circuit fault (PID P091, SPN 91, FMI 11, SRT 00-612). The accelerator pedal assembly relays the required accelerator percentage to the ECM, and this integrated sensor/switch (ISS) branch covers pedals where the position sensor and idle validation switch share one unit. It sets a red warning lamp and lists the exact conditions, causes, and step-by-step checks a technician follows.
Official document details
| Brand | Cummins |
|---|---|
| Model coverage | Cummins M11 CELECT electronic engines built 1990 to 1994 |
| System / Group | M11 CELECT (1990-94) |
| Fault identifiers | PID P091, SPN 91, FMI 11, SRT 00-612 |
| Warning lamp | Red |
| Pages | 7 |
| Format | |
| Language | English |
Document table of contents
- Circuit description
- Component location
- Shop Talk
- Step-by-step troubleshooting steps
- Fault code clearing and verification
Trucks covered by M11 code 432 ISS
This procedure applies to Cummins M11 CELECT electronic engines built 1990 to 1994. The procedure carries the Cummins fault identifiers PID P091, SPN 91, FMI 11, SRT 00-612 for reference and repair-time tracking. It is set by the ECM sees an accelerator position sensor signal that is out of range or interrupted, and typical effects include the red lamp illuminating and loss of normal accelerator control until the sensor and wiring are corrected. For engine specifications and dealer support, see the official Cummins website.
Who needs this M11 code 432 ISS manual
Heavy-truck technicians, fleet maintenance teams, and workshop owners diagnosing this fault use it to confirm the code before replacing parts. During diagnosis the accelerator position sensor circuit wires between the pedal and ECM can be replaced with test wires run around the bulkhead to isolate a faulty OEM harness. The step-by-step tree starts by reading active and inactive codes with the diagnostic tool, then inspects the harness and connector pins for bent, corroded, pushed-back, or expanded pins, flushing them with electronic contact cleaner Part Number 3824510 before any component is condemned. Test leads run around the bulkhead are used to isolate a faulty OEM harness, and the code is rechecked and cleared once the repair passes.
The full PDF is available in the DiagTechPro manuals library; a free account is required to download it.
Applies to these truck models
This is the manufacturer document shared across 2 model families. It applies to:
- Cummins DTCs
- Cummins M11 CELECT (1990-94)
Related manuals library
