1983 Chevrolet Citation 2D Hatchback, 2.8 Z, AutomaticFACTORY OEM SERVICE PROCEDURE

Trouble Code Id Chart

ECM TROUBLE CODE IDENTIFICATION

Code Circuit Affected
13 Open Oxygen Sensor Circuit
14 Coolant sensor circuit shorted/low voltage
15 Coolant sensor circuit open/high voltage
21 Throttle position sensor circuit open/low voltage
22 Throttle position sensor circuit open/high voltage
24 Vehicle speed sensor circuit
33 MAP sensor circuit voltage high
34 MAP-vacuum sensor circuit voltage low
42 EST by-pass circuit grounded/open
43 ESC retard signal too long
44 Lean oxygen sensor indication
44 & 45 At the same time, faulty oxygen sensor
45 Rich oxygen sensor indication
51 Faulty PROM or improper PROM installation
Factory Service Tools

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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.

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