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WesTech Technical Information - Isuzu Code Retrieval
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Isuzu Code Retrieval

Accessing Diagnostic Trouble Codes

Carbureted Models

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" lamp will flash the appropriate diagnostic trouble code's. The DTC's are indicated by a pulsing of the lamp. Two pulses followed by a short time lapse, then three pulses would indicate DTC 23 and so on. 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 1984-85

Connect male and female test leads taped into wire harness near ECM. After leads are connected, the "Check Engine" lamp will flash the appropriate diagnostic trouble codes. The DTC's are indicated by a pulsing of the lamp. Two pulses followed by a short time lapse, then three pulses would indicate DTC 23 and so on. 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.

1988-89

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 Oft, connect a jumper wire between terminals A and C. The "Check Engine" tamp will begin by flashing a DTC 12. DTC 12 consists of one flash, a short pause, then two flashes. 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 Oft. 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 most likely to occur in the throttle body fuel injection system. When a problem is detected, the diagnostic system will illuminate the "Check Engine" lamp in the instrument panel.

When the engine is started, the Check Engine lamp should turn oft. If the lamp 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 Oft and observe diagnostic trouble code display. Each DTC will flash three times in numerical order (lowest to highest). Each diagnostic trouble code will indicate a fault in a particular circuit.

Multi-Port Fuel Injection

Amigo, Pickup, Rodeo & Trooper II

On Amigo, Pickup and Rodeo (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" lamp should flash.

Impulse & Stylus

The provision for reading diagnostic trouble codes is through a white three cavity 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" lamp to emit any trouble codes stored in the memory of the ECM.

If no DTC's are stored, the tamp will flash DTC 12. If a diagnostic trouble code's) exist the lowest number DTC will flash first. Each DTC will flash three times.

Oasis

If the malfunction indicator/check engine lamp remains illuminated or comes on while the engine is operating, the ECM has detected a malfunction and has stored a diagnostic trouble code in its memory. To access the diagnostic 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. Turn the ignition switch On and begin troubleshooting as indicated by the tester. Follow the tester's prompts to diagnose the error. If unsure how to operate the OBD II scan tool, refer to the tools user's manuals for specific operating instructions.

Clearing Diagnostic Trouble Codes

Carbureted Models

Diagnostic 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.

Fuel 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 diagnostic trouble codes from the ECM memory.

Oasis

After making necessary repairs, the diagnostic trouble codes should be cleared from the ECM (ECU) memory. This can be done 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.

It will also be necessary to remove the SCS Service Connector if it had been connected, and reset the PCM. Turn the ignition to OFF, then disconnect the scan tool.


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