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HOMESERVICE MANUALSGMC1984VALUE VAN P3500, 7.4 W, AUTOMATIC, 475/M40REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMDIESEL CEC TESTINGREMOVAL & INSTALLATIONELECTRONIC CONTROL MODULE (ECM) R & IREMOVAL
1984 GMC Value Van P3500, 7.4 W, Automatic, 475/M40

Electronic Control Module (ECM) R & I: Removal

1984 GMC Value Van P3500, 7.4 W, Automatic, 475/M40SECTION Removal

Turn ignition switch off. Disconnect negative battery cables. Locate ECM and remove mounting hardware. Remove electrical connector from ECM and remove ECM. Remove PROM from ECM.

Fig 1: ECM Location. ECM is under right side of dash on Pickup models and under driver's seat on Van models.
G9482
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.