The Cummins ISM code 395 manual is a 5-page diagnostic PDF for the actuator circuit on the ISM CM570 (1999–2002) engine. It covers the front timing actuator that the electronic control module (ECM) pulses to control fuel timing on the fuel delivery housing.
Cummins ISM code 395 document details
| Brand | Cummins |
| Model coverage | ISM CM570 (1999–2002) |
| System / group | Actuator circuit — DTCs |
| DTC number | 395 |
| PID / SPN | S020 / 635 |
| FMI | 6/6 |
| Warning lamp | YELLOW |
| Pages | 5 |
| File format | |
| Language | English |
Document table of contents
- Circuit description and component location
- Shop talk on failure modes
- Actuator harness and ECM pin inspection
- Actuator resistance measurement
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 395 manual
The document explains that each timing actuator connects to the ECM by a supply and a return wire, with the normally closed solenoid opening only on an electrical pulse. It places the front timing actuator as the second actuator from the front of the engine. For this fault the listed failure modes are a short circuit to battery, low actuator resistance, or a short between the supply and return wires. The steps inspect the actuator harness and ECM connector pins for looseness, corrosion, bent pins, broken shells and damaged insulation before measuring resistance.
This guide suits diesel technicians and workshop owners who face a front timing actuator short or low-resistance fault and want a full connector inspection and resistance path. It reads as fault code 395 troubleshooting steps for the actuator circuit, keeping the diagnosis ordered and evidence-based.
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