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Yes. Check and B-41 (CAN High) . You must measure 60 ohms between these two pins at the DLC (Data Link Connector). If you see 120 ohms, one terminating resistor is missing. If you see 0 ohms, the CAN bus is shorted.
For 4HL1 models, never disconnect the battery within one minute of turning off the ignition to prevent ECM malfunction or data loss. isuzu 4hl1 ecu pinout link
For a more detailed and visual representation of the Isuzu 4HL1 ECU pinout, you can refer to the following resources: isuzu 4hl1 ecu pinout link
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The Isuzu 4HL1 ECU pinout diagram is shown below: