2021 RG01 Euro4 4JJ3 Diagnostic System Check Guide

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This illustration show you guide on how perform diagnostic system check engine control for ISUZU 2021 RG01 Euro 4JJ3 AWR6B45  Engine Control 4JJ3 with DPD.

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• If there are no complaints on drivability, do not perform these diagnostic steps unless otherwise instructed in other sections.
• Check for related Service Bulletins before starting the diagnosis.
• Do not clear the DTC unless instructed to do so in a diagnostic step.
• If a malfunction is found in the engine starting system, check the symptom diagnosis relating to the engine starting.
• The battery should be fully charged.
• The battery cable should be normal and securely connected.
• The ground of the ECM should be securely connected to the correct position.
• The ECM harness connectors should be clean and correctly connected.
• Do not attempt to crank the engine with the ECM harness connectors disconnected.
• The ECM terminals should be clean and correctly connected.
• Check if the Injector ID Code is programmed correctly.
• Check whether the immobilizer information is programmed correctly.
• If fuel system DTC P0088, P0089, P1093 or other DTCs are set, diagnose sensor DTCs, solenoid DTCs, actuator DTCs, and relay DTCs first.

 

 

Step 1:Scan tool power-up check

1) Connect the scan tool. Does the scan tool power up?

Yes

=>Go to Scan tool communication verification.

 

No

Go to Scan tool does not power up.

Refer to

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