DTC B152D:15 [HEAT PUMP CONTROL UNIT]

id0702l5719500

Outline

System malfunction location

Malfunction of circuit of temperature sensor of refrigerant line for evaporator outlet

Detection condition

•  The heat pump control unit detects a short to power supply or an open circuit in the circuit of the temperature sensor of the refrigerant line for the evaporator outlet.

Fail-safe

•  Stops cooling operation

Possible cause

•  Malfunction of connector or terminal of temperature sensor of refrigerant line for evaporator outlet

•  Heat pump control unit connector or terminal malfunction

•  Open circuit in signal circuit of temperature sensor of refrigerant line for evaporator outlet

•  Short to power supply in signal circuit of temperature sensor of refrigerant line for evaporator outlet

•  Malfunction of temperature sensor of refrigerant line for evaporator outlet

•  Heat pump control unit malfunction

System malfunction location	Malfunction of circuit of temperature sensor of refrigerant line for evaporator outlet
Detection condition	• The heat pump control unit detects a short to power supply or an open circuit in the circuit of the temperature sensor of the refrigerant line for the evaporator outlet.
Fail-safe	• Stops cooling operation
Possible cause	• Malfunction of connector or terminal of temperature sensor of refrigerant line for evaporator outlet • Heat pump control unit connector or terminal malfunction • Open circuit in signal circuit of temperature sensor of refrigerant line for evaporator outlet • Short to power supply in signal circuit of temperature sensor of refrigerant line for evaporator outlet • Malfunction of temperature sensor of refrigerant line for evaporator outlet • Heat pump control unit malfunction

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 CONNECTOR OF TEMPERATURE SENSOR OF REFRIGERANT LINE FOR EVAPORATOR OUTLET FOR MALFUNCTION

•  Inspect the applicable connector and terminal.
(See CONNECTOR INSPECTION.)

•  Are the connector and terminal normal?

Yes

Go to the next step.

No

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

3

INSPECT HEAT PUMP CONTROL UNIT CONNECTOR FOR MALFUNCTION

•  Inspect the applicable connector and terminal.
(See CONNECTOR INSPECTION.)

•  Are the connector and terminal normal?

Yes

Go to the next step.

No

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

4

INSPECT SIGNAL CIRCUIT OF TEMPERATURE SENSOR OF REFRIGERANT LINE FOR EVAPORATOR OUTLET FOR OPEN CIRCUIT

•  Inspect the applicable circuit for an open circuit.
(See CIRCUIT INSPECTION.)

•  Is the circuit normal?

Yes

Go to the next step.

No

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

5

INSPECT SIGNAL CIRCUIT OF TEMPERATURE SENSOR OF REFRIGERANT LINE FOR EVAPORATOR OUTLET FOR SHORT TO POWER SUPPLY

•  Inspect the applicable circuit for a short to power supply.
(See CIRCUIT INSPECTION.)

•  Is the circuit normal?

Yes

Go to the next step.

No

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

6

INSPECT TEMPERATURE SENSOR OF REFRIGERANT LINE FOR EVAPORATOR OUTLET FOR MALFUNCTION

•  Inspect the applicable part.
(See TEMPERATURE SENSOR OF REFRIGERANT LINE FOR EVAPORATOR OUTLET INSPECTION [FULL-AUTO AIR CONDITIONER].)

•  Is the part normal?

Yes

Go to the next step.

No

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

(See TEMPERATURE SENSOR OF REFRIGERANT LINE FOR EVAPORATOR OUTLET REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)

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 CONNECTOR OF TEMPERATURE SENSOR OF REFRIGERANT LINE FOR EVAPORATOR OUTLET FOR MALFUNCTION • Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION.) • Are the connector and terminal normal?	Yes	Go to the next step.
2		No	Repair or replace the malfunctioning location and perform the repair completion verification.
3	INSPECT HEAT PUMP CONTROL UNIT CONNECTOR FOR MALFUNCTION • Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION.) • Are the connector and terminal normal?	Yes	Go to the next step.
3		No	Repair or replace the malfunctioning location and perform the repair completion verification.
4	INSPECT SIGNAL CIRCUIT OF TEMPERATURE SENSOR OF REFRIGERANT LINE FOR EVAPORATOR OUTLET FOR OPEN CIRCUIT • Inspect the applicable circuit for an open circuit. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
4		No	Repair or replace the malfunctioning location and perform the repair completion verification.
5	INSPECT SIGNAL CIRCUIT OF TEMPERATURE SENSOR OF REFRIGERANT LINE FOR EVAPORATOR OUTLET FOR SHORT TO POWER SUPPLY • Inspect the applicable circuit for a short to power supply. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
5		No	Repair or replace the malfunctioning location and perform the repair completion verification.
6	INSPECT TEMPERATURE SENSOR OF REFRIGERANT LINE FOR EVAPORATOR OUTLET FOR MALFUNCTION • Inspect the applicable part. (See TEMPERATURE SENSOR OF REFRIGERANT LINE FOR EVAPORATOR OUTLET INSPECTION [FULL-AUTO AIR CONDITIONER].) • Is the part normal?	Yes	Go to the next step.
6		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See TEMPERATURE SENSOR OF REFRIGERANT LINE FOR EVAPORATOR OUTLET REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)
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.