Isuzu OBD / OBD2 Codes

Table of Contents

NOTE: 96 & later are OBD2 systems and require a scanner. For an OBD2 code list, please see our Isuzu code list or the appropriate generic list.

Isuzu: Accessing Trouble Codes

Except I-MARK

  • Connect white (test lead) and black (ground lead) wires that are branched from harness approximately eight inches from ECM.
  • After leads are grounded, the “Check Engine” light will flash the diagnostic trouble codes.
  • The DTC’s are indicated by the flashing CEL.
  • FLASH, FLASH, pause, FLASH, FLASH, FLASH = Code 23.
  • If only one diagnostic trouble code is stored, the DTC will repeat continuously until test leads are disconnected.
  • If more than one diagnostic trouble code is stored, each DTC will repeat three times, starting with the lowest, then proceed to the next DTC. After all DTC’s have been displayed, the pattern will repeat.
  • I-MARK 84-85

    • Connect male and female test leads taped into wire harness near ECM.
    • After leads are connected, the “Check Engine” lamp will flash the trouble codes.
    • The DTC’s are indicated by the flashing CEL.
    • FLASH, FLASH, pause, FLASH, FLASH, FLASH = Code 23.
    • If only one diagnostic trouble code is stored, the DTC will repeat continuously until test leads are disconnected.
    • If more than one diagnostic trouble code is stored, each DTC will repeat three times, starting with the lowest, then proceed to the next DTC. After all DTC’s have been displayed, the pattern will repeat.

    86-87 Impulse

    Entering Diagnostic Mode

    1. Turn ignition on. “CHECK ENGINE” lamp should light.
    2. Locate diagnostic leads.
    3. Connect diagnostic terminal leads together.
    4. If any trouble codes are stored in ECU memory, the “CHECK ENGINE” lamp will flash 2-digit codes.
    5. The trouble codes will be displayed from lowest to highest numbered code. Each code is repeated three times before the next code sequence is displayed. The trouble codes will be repeated as long as the diagnostic terminals are connected and the ignition is on.
    6. Remove fuse No.4 to clear memory.

    88-89

    • A three-terminal connector (ALDL), located near the ECM connector, is used to actuate the Engine Control Module (ECM) trouble code memory within the module.
    • Two terminals (A and C) of this connector are used to activate the diagnostic trouble code system in the ECM.
    • With the ignition switch turned On, engine Off, connect a jumper wire between terminals A and C.
    • The “Check Engine” lamp will begin by flashing a DTC 12. DTC 12 = flash, pause, flash, flash. There will be a longer pause and a code 12 will repeat two more times. This code indicates the self-diagnostic system is operating.
    • The cycle will then repeat until the engine is started or the ignition is switched Off. In most cases, DTC’s will be checked with the engine running since no DTC’s other than DTC 12 or 51 will be present without the engine running.
    • Remove jumper wire from ALDL connector before starting engine.
    • Reconnect jumper wire after engine is running.

    Throttle Body Fuel Injection

    • The ECM test connection is located under the center console.
    • A built-in, self diagnostic system will identify problems in the throttle body fuel injection system.
    • When a problem is detected, the diagnostic system will illuminate the “Check Engine” light.
    • When the engine is started, the Check Engine light should turn off.
    • If the light remains lit, the self diagnostic has detected a problem.
    • To determine where the problem exists, ground the “Test” terminal of the connector with the ignition On, engine Off and watch the check engine light. Each DTC will flash three times (lowest to highest).

    Multi-Port Fuel Injection

    Amigo,Trooper II , Rodeo & Pickup

    • On Rodeo, Amigo, and Pickup (except 1993-95 models W/3.2L engine), connect the single wire diagnostic leads located behind the left hand kick panel together.
    • On Trooper models to 1991, the single wire diagnostic connectors are located under the center console.
    • On 1992-95 Trooper & 1993-95 Rodeo models W/3.2L engine, connect a jumper wire between data link connector terminals 1 and 3.
    • On 1992-95 Trooper models the data link connector is located behind the lower front of the instrument panel.
    • On 1993-95 Rodeo models W/3.2 engine, the data link is located under the left hand side of the instrument panel.
    • On all models, turn the ignition switch to the On position. At this point, the “Check Engine” light should flash.

    Stylus & Impulse

    • A white three terminal ALDL connector located behind the passenger side kick panel.
    • The ECM has a battery voltage line to the ALDL connector.
    • Using a jumper wire, connect this terminal to ground.
    • The ECM will then toggle the “Check Engine” light to flash any trouble codes stored in the memory of the ECM.
    • If no DTC’s are stored, the light will flash DTC 12.
    • If a trouble code exist the lowest number DTC will flash first.
    • Each DTC will flash three times.

    Oasis

    • If the malfunction indicator/check engine lamp remains lit or comes on while the engine is operating, the ECM has detected a malfunction and has stored a trouble code in its memory.
    • To access the trouble code memory, connect an OBD II scan tool to the 16-pin DLC connector located behind the right-hand side of the front console.

    Clearing Trouble Codes

    Carb Models

    Trouble codes can be cleared by removing voltage to the ECM for 10 seconds. After a fault has been corrected, remove the ECM fuse or disconnect battery cables for 10 seconds.

    Injected Models

    Except Oasis

    To prevent damage to the ECM when disconnecting the battery ground cable, ensure the ignition key is in the Off position. Disconnecting the battery ground cable for 30 seconds or longer will clear all stored trouble codes from the ECM.

    Oasis

    Trouble codes should be cleared from the ECM (ECU) by either turning off the ignition switch and removing the back-up radio (7.5A) fuse from the under hood fuse/relay box for 10 seconds, or by using the OBD II scan tool to clear the ECM’s memory.

    Isuzu Diagnostic Trouble Codes

    Isuzu Codes by Model / Year

    ModelYearEngine identificationSystem
    Amigo 2.2L1998-00X22SE/Y22SEIsuzu MFI
    Amigo 3.2L1998-006VD1Isuzu MFI
    Ascender 4.2L2003-08VIN position 8 = SIsuzu MFI
    Ascender 5.3L2003-07VIN position 8 = PIsuzu MFI
    Axiom 3.5L20026VE1Isuzu MFI
    Hombre 2.2L1996-00VIN position 8 = 4Isuzu MFI
    Hombre 4.3L1996-00VIN position 8 = XfWIsuzu MFI
    i-280/290 2.8/2.9L2006-08LK5/LLVIsuzu MFI
    i-350/370 3.5/3.7L2006-08L52/LLRIsuzu MFI
    Oasis 2.2L1996-97F22B6Honda PGM-FI
    Oasis 2.3L1998-99F23A7Honda PGM-FI
    Rodeo 2.2L1998-02X22SE/Y22SEIsuzu MFI
    Rodeo 2.6L1996-974ZE1Isuzu MFI
    Rodeo 3.2L1993-956VD1Isuzu MFI
    Rodeo 3.2/3.5L1996-046VD1/6VE-DIIsuzu MFI
    Stylus 1.6/1.8L1991-934XE1-V/WIsuzu MFI
    Trooper 3.2L1992-956VD1-V/WIsuzu MFI
    Trooper 3.2L1996-976VD1Isuzu MFI
    Trooper 3.5L1998-026VE1Isuzu MFI
    VehiCROSS 3.5L1999-016VE1Isuzu MFI
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    Fredy Roldán
    Fredy Roldán
    2 years ago

    Buenas noches, tengo una rodeo 2.6, me reporta el código 13 y 44 que son del sensor de oxigeno, lo cambie y empeoró, el consumo de combustible aumento, ayuda porfavor.

    Andres Alcantar
    2 years ago

    I have a 1997 Isuzu NPR gas 5.7L with PO1810 code what does that mean and what can I do to fix the problem

    Collin Parker
    Collin Parker
    3 years ago

    I have a UK import Isuzu Trooper Bighorn Lotus edition with the 3.1 l TD. A flash code 2:1 repeats. I cannot find this vehicle on the Internet so can you suggest what this code means please?

    Johnny chavarria
    Johnny chavarria
    3 years ago
    Reply to  Collin Parker

    Buenas noches, tengo un isuzu rodeo motor 2.6, tiene la luz de O2 encendida y ya cambie el sensor, desconecte el negativo se la batería y no se resetea la luz.,..
    Me pueden decir si ahí otra manera?

    Jan de Klerk
    Jan de Klerk
    4 years ago

    Please help I need to know in what sequence the blue, yellow and green wires must sit into the female plug of my 2008, 3,0L D- teq,The teminals pulled out of the female plug by accident when I remove the starter.