Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1985C 10 P/U 2WD V8-350 5.7LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSRELAYS AND MODULES - COMPUTERS AND CONTROL SYSTEMSENGINE CONTROL MODULESERVICE AND REPAIR
1985 Chevrolet C 10 P/U 2WD V8-350 5.7L
Engine Control Module: Service and Repair
1985 Chevrolet C 10 P/U 2WD V8-350 5.7LSECTION Service and Repair
*** THIS PROCEDURE HAS BEEN UPDATED BY TSB #88-42, DATED 09/87
Some service replacement electronic control modules (ECM's) have contained a PROM. A PROM should not have been included in a replacement ECM as it may not be the correct PROM.
When this situation is encountered, the PROM should be removed from the replacement ECM and the PROM from the vehicle should be installed.
*** THIS PROCEDURE HAS BEEN UPDATED BY TSB #88-283-6E, DATED 7/88
To prevent possible electrostatic discharge damage to electrical components:
-Do not touch the ECM connector pins or soldered components on the circuit board.
-When handling a PROM, CAL-PAK or MEM-CAL, do not touch the component leads and do not remove integrated circuit from carrier.
Fig. 249 Electronic Control Module (ECM):
1. Disconnect battery ground cable.
2. Disconnect numbered and lettered connectors from ECM, Fig. 249.
3. Remove ECM mounting hardware, then the ECM from the passenger compartment.
4. Reverse procedure to install. Replacement Electronic Control Modules are not equipped with engine calibration units (PROM). If PROM is to be reused, care should be taken when removing it from defective ECM. See ``Prom, Replace'' for proper removal procedure.
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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.