DTC U3003:17 [HEAT PUMP CONTROL UNIT]

id0702l5719100

Outline

System malfunction location

Heat pump control unit high power supply voltage input

Detection condition

•  Voltage of the heat pump control unit supply circuit higher than the standard is detected.

Fail-safe

Not applicable

Possible cause

•  DTCs are stored in the PCM.

•  Lead-acid battery malfunction

•  Heat pump control unit malfunction

System wiring diagram

Not applicable

Connector diagram

Not applicable

System malfunction location	Heat pump control unit high power supply voltage input
Detection condition	• Voltage of the heat pump control unit supply circuit higher than the standard is detected.
Fail-safe	Not applicable
Possible cause	• DTCs are stored in the PCM. • Lead-acid battery malfunction • Heat pump control unit malfunction
System wiring diagram	Not applicable
Connector diagram	Not applicable

Diagnostic Procedure

Step

Inspection

Results

Action

1

VERIFY HEAT PUMP CONTROL UNIT DTCs AGAIN

•  Clear the DTC recorded in the memory.
(See CLEARING DTC.)

•  Perform the DTC inspection for the heat pump control unit.
(See DTC INSPECTION.)

•  Is the same DTC displayed?

Yes

Go to the next step.

No

Go to repair completion verification 2.

2

INSPECT FOR PCM RELATED MALFUNCTION

•  Perform the DTC inspection for the PCM.
(See DTC INSPECTION.)

•  Is a DTC displayed?

Yes

Repair the malfunctioning part according to the applicable DTC troubleshooting.

(See DTC TABLE [PCM (e-SKYACTIV)].)

No

Go to the next step.

3

INSPECT LEAD-ACID BATTERY FOR MALFUNCTION

•  Inspect the applicable part.
(See LEAD-ACID BATTERY INSPECTION.)

•  Is the part normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

(See LEAD-ACID BATTERY REMOVAL/INSTALLATION.)

Repair completion verification 1

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.)

•  Perform the DTC inspection for the heat pump control unit.
(See DTC INSPECTION.)

•  Is the same DTC displayed?

Yes

Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.

(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [L.H.D. (E)].)

(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [R.H.D.].)

If the CAN communication is normal, perform the diagnosis from Step 1.

•  If the malfunction is not resolved, replace the heat pump control unit, then go to the next step.
(See HEAT PUMP CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)

No

Go to the next step.

Repair completion verification 2

VERIFY IF OTHER DTCs ARE DISPLAYED

•  Perform the DTC inspection.
(See DTC INSPECTION.)

•  Are other DTCs displayed?

Yes

Repair the malfunctioning part according to the applicable DTC troubleshooting.

No

DTC troubleshooting completed.

Step	Inspection	Results	Action
1	VERIFY HEAT PUMP CONTROL UNIT DTCs AGAIN • Clear the DTC recorded in the memory. (See CLEARING DTC.) • Perform the DTC inspection for the heat pump control unit. (See DTC INSPECTION.) • Is the same DTC displayed?	Yes	Go to the next step.
1		No	Go to repair completion verification 2.
2	INSPECT FOR PCM RELATED MALFUNCTION • Perform the DTC inspection for the PCM. (See DTC INSPECTION.) • Is a DTC displayed?	Yes	Repair the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [PCM (e-SKYACTIV)].)
2		No	Go to the next step.
3	INSPECT LEAD-ACID BATTERY FOR MALFUNCTION • Inspect the applicable part. (See LEAD-ACID BATTERY INSPECTION.) • Is the part normal?	Yes	Go to the next step.
3		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See LEAD-ACID BATTERY REMOVAL/INSTALLATION.)
Repair completion verification 1	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.) • Perform the DTC inspection for the heat pump control unit. (See DTC INSPECTION.) • Is the same DTC displayed?	Yes	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [L.H.D. (E)].) (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [R.H.D.].) If the CAN communication is normal, perform the diagnosis from Step 1. • If the malfunction is not resolved, replace the heat pump control unit, then go to the next step. (See HEAT PUMP CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)
Repair completion verification 1		No	Go to the next step.
Repair completion verification 2	VERIFY IF OTHER DTCs ARE DISPLAYED • Perform the DTC inspection. (See DTC INSPECTION.) • Are other DTCs displayed?	Yes	Repair the malfunctioning part according to the applicable DTC troubleshooting.
Repair completion verification 2		No	DTC troubleshooting completed.