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 MANUALSGEO1993PRIZM L4-1600CC 1.6L DOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSDATA LINK CONNECTORDESCRIPTION AND OPERATION
1993 Geo Prizm L4-1600cc 1.6L DOHC
Data Link Connector: Description and Operation
1993 Geo Prizm L4-1600cc 1.6L DOHCSECTION Description and Operation
Jumper Installation:
The DLC is located in the engine compartment and is mounted to the left strut tower. The DLC is used to access DTCs that may be stored in the ECM/PCM memory. Diagnostic trouble codes (DTCs) stored in the ECM/PCM memory can be read by counting the number of flashes of the malfunction indicator lamp (MIL) with the ignition switch in the "ON" position with the diagnostic request terminal "TE1" grounded. The ECM/PCM enters its normal diagnostic mode and emits DTCs that have been detected one time within the last two ignition cycles. When "TE2" is grounded, the ECM/PCM enters its test diagnostic mode and lowers the threshold at which DTCs can be stored in the ECM/PCM memory. This function is helpful when diagnosising intermittent problems. With "TE1" and "TE2" grounded, DTCs that cannot be read in the normal diagnostic mode can be read.
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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.