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Home >> GMC >> 1984 >> Jimmy 5.7 L >> Repair and Diagnosis >> Engine Performance >> System >> Diesel CEC Testing >> Removal & Installation >> Electronic Control Module (ECM) R & I >> Removal
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Electronic Control Module (ECM) R & I: 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.
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