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 MANUALSOLDSMOBILE1989DELTA 88 V6-3800 3.8LREPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGTESTING AND INSPECTIONCOMPONENT TESTS AND GENERAL DIAGNOSTICSCOMPONENT DIAGNOSTIC CHARTS/TESTSCOMPRESSOR CONTROLSC: ECM COMPRESSOR CONTROL TEST
1989 Oldsmobile Delta 88 V6-3800 3.8L
C: ECM Compressor Control Test
1989 Oldsmobile Delta 88 V6-3800 3.8LSECTION C: ECM Compressor Control Test
1. Reconnect the A/C Cut-Out Relay. Remove the connectors from the ECM and check the voltage to ground using a test lamp at the following terminals.
^ If test is correct, proceed to step 2.
^ If test lamp does not light at Terminal C9 repair open in the LT BLU (67) wire.
2. Connect Terminal C15 of ECM connector C3 (see schematic) to ground with a fused jumper.
^ If A/C Compressor Control Relay operates and turns on the compressor, the compressor control wiring is good. Refer to Computers and Control Systems for ECM diagnostics. Computers and Control Systems
^ If the A/C Cut-Out Relay does not operate or the compressor does not turn on, check the LT GRN/BLK (366) wire for an open If wire is good, replace the A/C Cut-Out Relay.
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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.