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.
Engine Controls - Manual Update Revised DTC 51 Chart
1993 Geo Prizm L4-1600cc 1.6L DOHCSECTION Engine Controls - Manual Update Revised DTC 51 Chart
Group Ref.: Engine Fuel & Emission
Bulletin No.: 336509
Date: December, 1993
SERVICE MANUAL UPDATE
SUBJECT:
SECTION 6E3 - DTC 51 SWITCH CONDITION SIGNAL DIAGNOSTIC CHARTS REVISED
MODEL:
1993-94 GEO PRIZM 1.6L (VIN 6) AND 1.8L (VIN 8)
This bulletin serves to revise the diagnostic charts for DTC 51 on pages 6E3-A1-71 (1.6L VIN 6 RPO L01) and 6E3-A2-75 (1.8L VIN 8 RPO LV6) in the following Geo Prizm service publications:
1993 Geo Prizm Service Manual (ST373-93)
1994 Geo Prizm Service Manual Book 2 (ST373-94-2)
Bulletin No.: 336509
Date: December, 1993
SERVICE MANUAL UPDATE
SUBJECT:
SECTION 6E3 - DTC 51 SWITCH CONDITION SIGNAL DIAGNOSTIC CHARTS REVISED
MODEL:
1993-94 GEO PRIZM 1.6L (VIN 6) AND 1.8L (VIN 8)
This bulletin serves to revise the diagnostic charts for DTC 51 on pages 6E3-A1-71 (1.6L VIN 6 RPO L01) and 6E3-A2-75 (1.8L VIN 8 RPO LV6) in the following Geo Prizm service publications:
1993 Geo Prizm Service Manual (ST373-93)
1994 Geo Prizm Service Manual Book 2 (ST373-94-2)
RENDER: 1.0x
NO RELATED
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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.