The Cummins ISM code 428 manual is a 4-page diagnostic PDF for the water-in-fuel (WIF) sensor circuit on the ISM CM570 (1999–2002) engine. It covers a short-circuit condition on the water-in-fuel (WIF) sensor that reports to the electronic control module (ECM) when water collects in the fuel filter.
Cummins ISM code 428 document details
| Brand | Cummins |
| Model coverage | ISM CM570 (1999–2002) |
| System / group | Water-in-fuel (WIF) sensor circuit — DTCs |
| DTC number | 428 |
| PID / SPN | P097 / 97 |
| FMI | 3/3 |
| Warning lamp | YELLOW |
| Pages | 4 |
| File format | |
| Language | English |
Document table of contents
- Circuit description and component location
- Shop talk on 5-volt short circuit
- Sensor and ECM connector pin inspection
- Harness and sensor replacement decision
Applicable truck models
This procedure applies to the ISM CM570 (1999–2002) engine and the shared CM570 fuel-system platform found in on-highway trucks. The same fault-code logic is carried across related CM570 engine families of that era. For engine identification and factory service references, see the manufacturer at the Cummins official website.
Who needs this Cummins ISM code 428 manual
The document identifies the same two-wire circuit, a return ground on pin 10 and a signal wire on pin 9, with the sensor on the side of the head roughly mid-engine. It lists a short circuit to a 5-volt supply wire as a likely cause. The steps inspect the sensor and ECM connector pins for corrosion, bent or pushed-back pins, moisture and missing seals, flushing contacts with electrical contact cleaner Part Number 3824510 before replacing the OEM harness, sensor or ECM.
This guide suits diesel technicians and workshop owners who face a high-signal or shorted water-in-fuel reading and want to isolate the wiring fault before swapping the sensor. It reads as fault code 428 troubleshooting steps for the water-in-fuel (WIF) sensor circuit, keeping the diagnosis ordered and evidence-based.
The full PDF is available in the DiagTechPro manuals library, where a free account is required to download it.
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