How to Read Hyundai OBD 1 Codes Without OBD Scanner

How to Read Hyundai OBD 1 Codes

This tutorial will work for the following  Hyundai Cars Model: Excel 1990-2000,Lantra 1991-20000,Coupe 1990-2000,Sonata 1989-2000,Pony 1990-1994,Accent 1995-2000

Accessing trouble codes

  • Ensure ignition switched OFF.
  • Connect analogue voltmeter between data link connector (DLC) terminals 1 and 12 Fig. 1 .HYUNDAI OBD1 socket location and jumper settings
  • Switch ignition ON.
  • Count voltmeter needle deflections.
  • Note trouble codes. Compare with trouble code table.
  • Each trouble code consists of two groups of one or more needle deflections Fig. 2 .
  • Long deflections indicate the ‘tens’ of the trouble code Fig. 2 [A].
  • Short deflections indicate the ‘units’ of the trouble code Fig. 2 [C].
  • A short pause separates each deflection Fig. 2 [B].
  • A long pause separates each trouble code Fig. 2 [D].
  • For example: Trouble code 12 displayed Fig. 2 .
  • Rectify faults as hyundai obd 1 codes using code pattern

Erasing trouble codes

  • Ensure ignition switched OFF.
  • Disconnect battery earth lead.
  • Wait 15 seconds.
  • Reconnect battery earth lead.

WARNING: Disconnecting the battery may erase memory from electronic units (e.g. radio, clock)


List of OBD 1 Codes

Trouble codeFault locationProbable cause
11Heated oxygen sensor (HO2S) 1 – circuit malfunctionWiring, HO2S, ECM
12Mass air flow (MAF) sensor/volume air flow (VAF) sensor – circuit malfunctionWiring, MAF/VAF sensor, ECM
13Intake air temperature (IAT) sensor – circuit malfunctionWiring, IAT sensor, ECM
14Throttle position (TP) sensor – circuit malfunctionWiring, TP sensor, ECM
21Engine coolant temperature (ECT) sensor – circuit malfunctionWiring, ECT sensor, ECM
22Engine speed (RPM) sensor/crankshaft position (CKP) sensor – circuit malfunctionWiring, RPM/CKP sensor, ECM
23Camshaft position (CMP) sensor – circuit malfunctionWiring, CMP sensor, ECM
24Vehicle speed sensor (VSS) – circuit malfunctionWiring, VSS, ECM
25Barometric pressure (BARO) sensor – circuit malfunctionWiring, BARO sensor, ECM
41Injector(s) – circuit malfunctionWiring, injector(s), ECM
42Fuel pump (FP) – circuit malfunctionWiring, FP relay, FP, ECM
43Exhaust gas recirculation (EGR) solenoid – circuit malfunctionWiring, EGR solenoid, ECM
44Ignition coilWiring open/short circuit, ignition coil/ignition amplifier, ECM
59Heated oxygen sensor (HO2S) 2 – circuit malfunctionWiring, HO2S, ECM
1111111No fault found