Mechanics

Isuzu Trouble Codes OBD1

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Step by step guide on how to retrieve and decode Isuzu ODB1 trouble codes for vehicles older than 1995.

Difficulty Scale: 2 of 10

Begin with the vehicle on level ground with the engine "OFF" and the parking brake set..

Step 1 - To retrieve codes locate the data port connector which is under the dash or the drivers or passengers side or under the hood near the battery or firewall. Once the connector is located use a jumper wire to connect the "A' and "B" terminals.

Step 2 - Next, turn the ignition key to the "ON" position (do not start the engine). The check engine light will start blinking; the first set of blinks will be the first number of the trouble code. Then a short pause will occur and the second code number will follow. For an example if the check engine light blinks three times and then a short break and then blinks two time the code number will be 32.

Step 3 - To restart the code gathering process turn the ignition key to the "OFF" position and then back "ON" again. To clear diagnostic trouble codes once the repair has been made remove the negative battery cable for thirty seconds and reconnect.

Trouble Code Table

Code 12 System normal

Code 13 Oxygen sensor fault

Code 14 Coolant temperature fault

Code 21 TPS signal fault

Code 23 MAT circuit fault

Code 24 Vehicle speed signal sensor fault

Code 32 EGR sensor fault

Code 23 MAP sensor fault

Code 42 Electronic spark timing fault

Code 43 Electronic spark control fault

Code 44 Oxygen sensor fault

Code 51 Prom error

Code 55 ECM fault

Helpful Information

All Isuzu cars and light truck are equipped with the ODB1 computer system (before 1996). The system triggers trouble codes once the computer system has malfunctioned. These codes will present themselves as two digit codes and can be read at the check engine light which is similar the the GM style of OBD1 code gathering.

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AUTHOR


Written by
Co-Founder and CEO of 2CarPros.com
35 years in the automotive repair field, ASE Master Technician, Advanced Electrical and Mechanical Theory.


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Article first published (Updated 2014-07-10)