Heater Pump

HEATER PUMP

Component Function Check


1. CHECK HEATER PUMP OPERATING CONDITION

With CONSULT
1.Using CONSULT, perform "HVAC TEST" on "ACTIVE TEST" of "HVAC". Refer to "CONSULT Function" CONSULT Function.
2.Confirm heater pump operation by the sound or hose pulsation.
Is the inspection result normal?
YES- INSPECTION END
NO- Refer to "Diagnosis Procedure" .


Diagnosis Procedure


1. CHECK HEATER PUMP POWER SUPPLY

1.Turn power switch OFF.
2.Disconnect heater pump connector.
3.Turn power switch ON.
4.Check voltage between heater pump harness connector and ground.





Is the inspection result normal?
YES- GO TO 3.
NO- GO TO 2.

2. CHECK A/C RELAY CIRCUIT

Check A/C relay circuit. Refer to "Diagnosis Procedure" A/C Relay.
Is the inspection result normal?
YES- Repair harness or connector between A/C relay and heater pump.
NO- Repair or replace error-detected parts.

3. CHECK HEATER PUMP GROUND CIRCUIT

Check continuity between heater pump harness connector and ground.





Is the inspection result normal?
YES- GO TO 4.
NO- Repair harness or connector.

4. CHECK HEATER PUMP COMMUNICATION LINE FOR OPEN-I

1.Turn power switch OFF.
2.Disconnect A/C auto amp. connector.
3.Check continuity between heater pump harness connector and A/C auto amp. harness connector.





Is the inspection result normal?
YES- GO TO 5.
NO- Repair harness or connector.

5. CHECK HEATER PUMP COMMUNICATION LINE FOR SHORT-I

Check continuity between heater pump harness connector and ground.





Is the inspection result normal?
YES- GO TO 6.
NO- Repair harness or connector.

6. CHECK A/C AUTO AMP. INPUT SIGNAL-I

1.Connect heater pump and A/C auto amp. connector.
2.Turn power switch ON.
3.Check signal between A/C auto amp. harness connector and ground with oscilloscope.





Is the inspection result normal?
YES- GO TO 7.
NO- Replace A/C auto amp. Refer to "Removal and Installation" Service and Repair.

7. CHECK HEATER PUMP COMMUNICATION LINE FOR OPEN-II

1.Turn power switch OFF.
2.Disconnect heater pump and A/C auto amp. connector.
3.Check continuity between heater pump harness connector and A/C auto amp. harness connector.





Is the inspection result normal?
YES- GO TO 8.
NO- Repair harness or connector.

8. CHECK HEATER PUMP COMMUNICATION LINE FOR SHORT-II

Check continuity between heater pump harness connector and ground.





Is the inspection result normal?
YES- GO TO 9.
NO- Repair harness or connector.

9. CHECK A/C AUTO AMP. INPUT SIGNAL-II

1.Connect heater pump and A/C auto amp. connector.
2.Turn power switch ON.
3.Check signal between A/C auto amp. harness connector and ground with oscilloscope.





Is the inspection result normal?
YES- GO TO 10.
NO- Replace heater pump. Refer to "Removal and Installation" Removal And Installation.

10. CHECK INTERMITTENT INCIDENT

Check intermittent incident. Refer to "Intermittent Incident" Intermittent Incident.
Is the inspection result normal?
YES- Replace A/C control (A/C auto amp.). Refer to "Removal and Installation" Service and Repair.
NO- Repair or replace malfunctioning parts.