Diagnosis Procedure

HEATER PUMP


Description


SYSTEM DESCRIPTION





This vehicle uses an heater pump for air conditioning. This provides a stable heater performance even if the engine is stopped because of a function of the IPDM E/R.





HEATER PUMP


Diagnosis Procedure

Regarding Wiring Diagram information, Electrical Diagrams.
1.PERFORM ACTIVE TEST
1. Turn ignition switch ON (READY).
2. Press OFF switch. (A/C system does not operates.)
3. Perform "HVAC TEST" in "ACTIVE TEST" mode with CONSULT-III.
4. Select "MODE 7" in "HVAC TEST" active test item.

CAUTION:
Complete this inspection within 10 seconds if there is no water in the heater pump.
5. Check that heater pump operates.

MODE 7 : HEATER PUMP ON

Is the inspection result normal?
YES - GO TO 4.
NO - Check 10A hues (No. 41 located in IPDM E/R), and GO TO 2.
2.CHECK CIRCUIT CONTINUITY BETWEEN IPDM E/R AND HEATER PUMP
1. Turn ignition switch OFF.
2. Disconnect IPDM E/R connector and heater pump connector.
3. Check continuity between IPDM E/R harness connector F10 terminal 48 and heater pump harness connector E83 terminal 1.





Is the inspection result normal?
YES - GO TO 3.
NO - Repair harness or connector.
3.CHECK VOLTAGE BETWEEN HEATER PUMP AND GROUND
1. Turn ignition switch ON (READY).
2. Press OFF switch. (A/C system does not operates.)
3. Perform "HVAC TEST" in "ACTIVE TEST" mode with CONSULT-III.
4. Select "MODE 1 - 7" in "HVAC TEST" active test item.

CAUTION:
Complete this inspection within 10 seconds if there is no water in the heater pump.
5. Check voltage between heater pump harness connector E83 terminal 1 and ground.






Is the inspection result normal?
YES - Replace heater pump. Heater Pump.
NO - Check IPDM E/R. Diagnosis Description.
4.CHECK AUTO amp. INPUT (HEATER PUMP ON) SIGNAL
Check heater pump ON/OFF signal in "DATA MONITOR". Auto AMP..





Is the inspection result normal?
YES - GO TO 5.
NO - Replace auto amp. Service and Repair.
5.CHECK CAN COMMUNICATION
Check CAN communication. Diagnosis Description.
- ECM - IPDM E/R
Is the inspection result normal?
YES - Replace ECM. Special Repair Requirement.
NO - Repair or replace malfunctioning part(s).