*Disclaimer* This information was taken directly out of a 1993 Pontiac Firebird GM Service Manual. This is NOT my own work, just scans of the charts and descriptions from the manual. Being that the 93 is a model specific year, I cannot guarantee accuracy of these on a 94-97 LT1 vehicle, but a lot of them do cross flow, especially the Non-DTC Driveability Diagnosis.
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Diagnostic Trouble Codes (SES Light |
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DTC 13 -- Bank 1 (Left) Oxygen Sensor Circuit (Open Circuit) Description -- Chart DTC 14 -- Engine Coolant Temperature Sensor Circuit (High Temperature Indicated) Description -- Chart DTC 15 -- Engine Coolant Temperature Sensor Circuit (Low Temperature Indicated) Description -- Chart DTC 16 -- Distributor Ignition System (Low Resolution Pulse) Description -- Chart DTC 21 -- Throttle Position Sensor Circuit (Signal Voltage High) Description -- Chart DTC 22 -- Throttle Position Sensor Circuit (Signal Voltage Low) Description -- Chart DTC 23 -- Intake Air Temperature Sensor Circuit (Low Temperature Indicated) Description -- Chart DTC 24 -- Vehicle Speed Sensor (VSS) Circuit Description -- Chart DTC 25 -- Intake Air Temperature (IAT) Sensor Circuit (High Temperature Indicated) Description -- Chart DTC 26 -- Quad-Driver Module (QDM) #1 Circuit Description -- Chart DTC 27 -- Quad-Driver Module (QDM) #2 Circuit Description -- Chart DTC 28 -- Quad-Driver Module (QDM) #3 Circuit Description -- Chart DTC 32 -- Exhaust Gas Recirculation (EGR) Circuit DTC 33 -- Manifold Absolute Pressure Sensor Circuit (Signal Voltage High - Low Vacuum) Description -- Chart DTC 34 -- Manifold Absolute Pressure Sensor Circuit (Signal Voltage Low - High Vacuum) Description -- Chart DTC 36 -- Distributor Ignition System (Faulty High Res Pulse or Extra Low Res Pulse Detected) Description -- Chart DTC 41 -- Ignition Control (IC) Circuit (Open or Shorted Circuit) Description -- Chart
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DTC 42 -- Ignition Control (IC) Circuit (Grounded Circuit) Description -- Chart DTC 43 -- Knock Sensor (KS) Circuit Description -- Chart DTC 44 -- Bank 1 (Left) Oxygen Sensor (O2S) Circuit (Lean Exhaust Indicated) Description -- Chart DTC 45 -- Bank 1 (Left) Oxygen Sensor (O2S) Circuit (Rich Exhaust Indicated) Description -- Chart DTC 46 -- Personal Automotive Security System (PASS-Key II) Circuit Description -- Chart DTC 51 -- Prom Error (Faulty or Incorrect Prom) Description -- Chart DTC 53 -- System Voltage Description -- Chart DTC 55 -- Fuel Lean Monitor Description -- Chart DTC 61 -- A/C System Performance Description -- Chart DTC 63 -- Bank 2 (Right) Oxygen Sensor (O2S) Circuit (Open Circuit) Description -- Chart DTC 64 -- Bank 2 (Right) Oxygen Sensor (O2S) Circuit (Lean Exhaust Indicated) Description -- Chart DTC 65 -- Bank 2 (Right) Oxygen Sensor (O2S) Circuit (Rich Exhaust Indicated) Description -- Chart DTC 66 -- A/C Refrigerant Pressure Sensor Circuit (Open or Shorted) Description -- Chart DTC 67 -- A/C Pressure Sensor Circuit (Pressure Sensor or A/C Clutch Circuit Problem) Description -- Chart DTC 68 -- A/C Relay Circuit (Shorted Circuit) Description -- Chart DTC 69 -- A/C Clutch Circuit Description -- Chart DTC 71 -- A/C Evaporator Temperature Sensor Circuit (Open or Shorted) Description -- Chart |
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Non-DTC Driveability Diagnosis |
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Lack or Power, Sluggish or Spongy |
Engine Cranks But Will Not Run
Fuel Pump Relay Circuit
Fuel System Diagnosis
Cuts Out, Misses
Rough, Unstable, or Incorrect Idle, Stalling |
