This Cummins intake heater relay manual is a 4-page diagnostic document for Fault Code 382 on Cummins ISB CM550 engines. It covers PID S237, SPN 626, FMI 11, and the intake air heater relay circuit checks used when the ECM controls heater relays for cold-start aid and white smoke control. The file is intended for workshop diagnosis of relay enable wiring, OEM harness faults, connector damage, shorts, opens, and post-repair code clearing.
Official Cummins intake heater relay document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB CM550 (1990-94) |
| System/Group | DTCs; Intake Air Heater Relay Circuit |
| Publication no. | Not shown in the extract |
| Year/Revision | Unknown; document copywrite 2017 shown |
| Pages | 4 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Fault Code: 382
- PID: S237
- SPN: 626
- FMI: 11
- Intake Air Heater Relay Circuit
- Description
- Component Location
- Troubleshooting Steps
- Step 1A: inspect OEM harness, intake air heater relay, and ECM connectors
- Step 1B: check for an open circuit in the relay enable circuit
- Step 1C: check for an open circuit in the relay and relay ground
- Step 1D: check for a short circuit to ground in the intake air heater relay circuit
- Step 1E: check for a short circuit from pin to pin in the intake air heater relay circuit
- Step 1F: check for a short circuit to battery
- Step 2A: verify that Fault Codes 382 are inactive
- Step 2B: clear the inactive fault codes using the diagnostic tool
Applicable truck models
This document applies to Cummins ISB CM550 (1990-94) diagnostic trouble code coverage where Fault Code 382 is present for the intake air heater relay circuit. The extract does not name specific truck makes or chassis models, and it states that the intake air heater is located at the air inlet connection into the intake manifold while heater relay location varies with the OEM. For manufacturer information, visit the Cummins official website.
Who needs this Cummins intake heater relay manual
Mechanics, diesel diagnostic technicians, and workshop owners need this Cummins intake heater relay manual when an ISB CM550 reports Fault Code 382 and the repair path requires connector inspection, resistance checks, voltage checks, relay ground checks, or OEM harness replacement decisions. It is also useful when intake air heater circuits may be shorted to battery positive, a condition the document warns can keep grids on full time, drain batteries, burn out grids, or damage intake gaskets.
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