Troubleshooting Diagnostic Procedure

P2503: 00 (PCM (H3T)) DIAGNOSTIC PROCEDURE

Step	Inspection	Results	Action
1	PURPOSE: CHECK HARNESS BETWEEN BATTERY AND DC-DC CONVERTER (INCLUDING CONNECTORS AND TERMINALS) Inspect the applicable circuit. (See CIRCUIT INSPECTION .) (See CONNECTOR INSPECTION .) Is the circuit normal?	Yes	Go to the next step.
1		No	Repair or replace the malfunctioning location and perform the repair completion verification 1.
2	PURPOSE: CHECK HARNESS (INCLUDING CONNECTORS/TERMINALS) BETWEEN DC-DC CONVERTER AND PCM Inspect the applicable circuit. (See CIRCUIT INSPECTION .) (See CONNECTOR INSPECTION .) Is the circuit normal?	Yes	Go to the next step.
2		No	Repair or replace the malfunctioning location and perform the repair completion verification 1.
3	PURPOSE: PERFORM DTC INSPECTION AND VERIFY MALFUNCTIONING LOCATION IS DC-DC CONVERTER Install/connect the part removed/disconnected during the troubleshooting procedure. Clear the DTC recorded in the memory. (See CLEARING DTC .) Replicate the vehicle conditions at the time the DTC was detected using the following procedure. Implement the repeatability verification procedure. (See Repeatability verification procedure ). Perform the DTC inspection for the PCM. (See DTC INSPECTION .) Is the same DTC displayed?	Yes	Refer to the CAN (controller area network) malfunction diagnosis flow to inspect for a CAN communication error. (See MALFUNCTION DIAGNOSIS FLOW [CONTROLLER AREA NETWORK (CAN)] .) If the malfunction is not resolved, replace the DC-DC converter then go to the next step. (Refer to [DC-DC CONVERTER REMOVAL/INSTALLATION ] in service information).
3		No	Go to repair completion verification 2.
Repair completion verification 1	PURPOSE: VERIFY THAT VEHICLE IS REPAIRED Install/connect the part removed/disconnected during the troubleshooting procedure. Clear the DTC recorded in the memory. (See CLEARING DTC .) Replicate the vehicle conditions at the time the DTC was detected using the following procedure. Implement the repeatability verification procedure. (See Repeatability verification procedure ). Perform the DTC inspection for the PCM. (See DTC INSPECTION .) Is the same DTC displayed?	Yes	Refer to the CAN (controller area network) malfunction diagnosis flow to inspect for a CAN communication error. (See MALFUNCTION DIAGNOSIS FLOW [CONTROLLER AREA NETWORK (CAN)] .) If the CAN communication is normal, perform the diagnosis from Step 1. If, malfunction is not resolved, replace the PCM, then go to the next step. (Refer to [PCM REMOVAL/INSTALLATION ] in service information).
Repair completion verification 1		No	Go to the next step.
Repair completion verification 2	PURPOSE: VERIFY IF OTHER DTCs ARE DISPLAYED Perform the DTC inspection. (See DTC INSPECTION .) Are other DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [PCM (H3T)] .)
Repair completion verification 2		No	DTC troubleshooting completed.