1993 Acura Vigor LS, AutomaticFACTORY OEM SERVICE PROCEDURE

Trouble Code Identification

TROUBLE CODE IDENTIFICATION

Code (1) System Affected Probable Cause
0  ECM No Signal To ECM
1  HO2S HO2S Circuit Problem
3  MAP Sensor MAP Sensor Problem
4  Crank Angle Open/Shorted Signal Circuit
5  MAP Sensor Open/Shorted Signal Circuit
6 (2) Coolant Temperature Sensor Open/Shorted Signal Circuit
7 (2) Throttle Angle Sensor Open/Shorted Signal Circuit
8  Crank Angle Sensor (TDC) Open/Shorted Signal Circuit
9  Crank Angle Sensor (CYL) Open/Shorted Signal Circuit
10  Intake Air Temperature (TA) Sensor Sensor Problem
12  EGR System Faulty EGR Valve (A/T)
13  Barometric Pressure (BARO) Sensor BARO Circuit Problem
14  Idle Air Control Valve (IACV) Open/Shorted Signal Circuit
15  Ignition Output Signal Open/Shorted Signal Circuit, Poor Connections At ECM/Ignitor Unit
16  Fuel Injector Open/Shorted Signal Circuit
17 (2) Vehicle Speed Sensor (VSS) Open/Shorted Signal Circuit
18  Ignition Timing Adjuster Open/Shorted Signal Circuit
20 (3) Electrical Load Detector (ELD) Open/Shorted Signal Circuit
23  Knock Sensor No. 1 Open/Shorted Signal Circuit
30 (3) A/T FI Signal Open/Shorted Signal Circuit
31 (3) A/T FI Signal Open/Shorted Signal Circuit
41  HO2S Heater Open/Shorted Signal Circuit
43  Fuel Supply System Open/Shorted O2 Circuit
45  Fuel Metering Incorrect Fuel Metering
53  Knock Sensor No. 2 Open/Shorted Signal Circuit
(1)
If codes other than these are indicated, repeat self-diagnosis. If code(s) reappear, substitute a known good ECM, and recheck codes.
(2)
If S4 on automatic transaxle indicator panel also blinks, A/T control unit may require diagnosis.
(3)
MIL will not come on if malfunction is in A/T FI or Electrical Load Detector circuit. Fault code will, however, be stored in ECM memory.
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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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