2021 RG01 Euro4 4JJ3 Diagnostic System Check Guide

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 “51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) Scan tool does not power up”.

 

Step 2:Scan tool communication verification

1) Turn ON the ignition switch.

2) Check the communication status with the ECM using the scan tool. Can communication with the ECM be established?

 

Yes

=>Go to Immobilizer-related DTC check.

 

No

Go to Lost communication with the ECM.

Refer to “51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) lost communication with the ECM (models with radar sensor/ stereo camera)”.

Refer to “51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) lost communication with the ECM (models without radar sensor and stereo camera)”.

 

 

 

Step 3 Immobilizer-related DTC check

1) Observe the DTC information with a scan tool. Is DTC P0633, P161B, U0167, U2300, U2301, U2302, or U2303 set?

Yes

Go to the applicable DTC diagnosis.

Refer to “51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P0633 Immobilizer Key Not Programmed – ECM/PCM”.

Refer to “51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P161B Immobilizer Wrong Response”.

Refer to “51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC U0167 Lost Communication With Vehicle Immobilizer Control Module”.

Refer to “51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC U2300 Immobilizer Ignition Line Off”.

Refer to “51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC U2301 Immobilizer Transponder Authentication NG”.

Refer to “51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC U2302 Immobilizer Anti-Scanning Mode”.

Refer to “51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC U2303 Immobilizer Unknown Signal Received”.

 

No

=>Go to Control module DTC check.

 

Step 4 Control module DTC check

1) Observe the DTC information for each control module with a scan tool. Does the scan tool display a DTC for any control module?

Yes

=>Go to Communication-related DTC check.

 

No

=>Go to Cranking check.

 

Step 5 Communication-related DTC check

1) Observe the DTC information with a scan tool. Is a DTC beginning with U or a DTC related to communication with other control modules set?

Yes

Go to the applicable DTC diagnosis.

 

No

=>Go to Control module internal-related DTC check.

 

Step 6 Control module internal-related DTC check

1) Observe the DTC information with a scan tool. Is DTC P0601, P0602, P0604, P0606, P060B, or P1621 set?

Yes

Go to the applicable DTC diagnosis.

Refer to “51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P0601 Internal Control Module Memory Check Sum Error”.

Refer to “51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P0602 Control Module Programming Error”.

Refer to “51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P0604 Internal Control Module Random Access Memory (RAM) Error”.

Refer to “51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P0606 ECM/PCM Processor”.

Refer to “51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P060B Internal Control Module A/D Processing Performance”.

Refer to “51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P1621 Control Module Long Term Memory Performance”.

 

No

=>Go to System voltage-related DTC check.

 

Step 7 System voltage-related DTC check

1) Observe the DTC information with a scan tool. Is DTC P0563 set?

Yes

Go to DTC P0563 diagnosis.

Refer to “51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P0563 System Voltage High”.

 

No

=>Go to Other DTC check.

 

Step 8 Other DTC check

1) Observe the DTC information with a scan tool. Are other DTCs set?

Yes

Go to the applicable DTC diagnosis.

 

No

=>Go to Cranking check.

 

Step 9 Cranking check

1) Crank the engine. Does the engine crank?

Note:

• If the immobilizer system is activated, the ECM deactivates the fuel injection and performs starter cut to cancel cranking.

 

Yes

=>Go to Engine start check.

 

No

Diagnose the cause of the lack of cranking.

Refer to “202.Engine 15D.Symptom(4JJ3 with DPD) engine does not turn over”.

 

 

 

Step 10 Engine start check

1) Start the engine. Does the engine start?

Yes

=>Go to Customer’s concern check.

 

No

Go to Starting system check.

Refer to “51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) starting system check”.

 

 

 

Step 11 Customer’s concern check

1) Check if the customer’s concern is related to the systems other than engines. Is the customer’s concern related to the systems other than engines?

Yes

Go to the applicable control system inspection.

 

No

=>Go to Symptom check.

 

Step 12 Symptom check

1) Check if the following symptoms are present. Is there any applicable symptom?

 

• Hard start
• Rough, unstable
• High idle speed
• Cuts out
• Surges
• Lack of power, sluggishness or sponginess
• Hesitation, sag or stumble
• Abnormal combustion noise
• Poor fuel economy
• Black smoke
• White smoke

 

Yes

Repair the applicable symptom.

Refer to “202.Engine 15D.Symptom(4JJ3 with DPD) Hard start”.

Refer to “202.Engine 15D.Symptom(4JJ3 with DPD) rough, unstable”.

Refer to “202.Engine 15D.Symptom(4JJ3 with DPD) High idle speed”.

Refer to “202.Engine 15D.Symptom(4JJ3 with DPD) cuts out”.

Refer to “202.Engine 15D.Symptom(4JJ3 with DPD) surges”.

Refer to “202.Engine 15D.Symptom(4JJ3 with DPD) lack of power, sluggishness or sponginess”.

Refer to “202.Engine 15D.Symptom(4JJ3 with DPD) hesitation, sag or stumble”.

Refer to “202.Engine 15D.Symptom(4JJ3 with DPD) abnormal combustion noise”.

Refer to “202.Engine 15D.Symptom(4JJ3 with DPD) poor fuel economy”.

Refer to “202.Engine 15D.Symptom(4JJ3 with DPD) Black smoke”.

Refer to “202.Engine 15D.Symptom(4JJ3 with DPD) White smoke”.

 

No

Go to Intermittent conditions of engine.

Refer to “202.Engine 15D.Symptom(4JJ3 with DPD) intermittent conditions of engine”.

 

For more guide about ISUZU,please refer to:ISUZU Trouble Repair.