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P1C05-71 Heater Valve Stuck
 
 
cautionBefore replacing the ECU, ensure that the CAN bus lines is normal.
 
 
MONITOR EXECUTION
Continuous
 
 
MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)
Other Monitor (There is no temporary DTC stored in memory for the item monitored below)
  • Not applicable
Sensor (The sensor below is determined to be normal)
  • Not applicable
 
 
DTC SET CONDITIONS
Logic Flow Chart
 
 
TROUBLE JUDGMENT
Check Condition
  • The heater PHEV A/C amp. power supply voltage is between 10 and 16 volts.
Judgment Criterion
  • Failure in the expansion valve (for heating) circuit is detected for 4 seconds or more.
 
 
OBD-II DRIVE CYCLE PATTERN
 
 
PROBABLE CAUSES
  • Malfunction of harness and connectors
  • Malfunction of expansion valve (for heating)
  • Malfunction of PHEV A/C amp.
 
 
DIAGNOSIS PROCEDURE
1.Check the drive circuit voltage of the expansion valve (for heating)
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Change the power supply mode of the electric motor switch to ON (READY indicator: ON).
(3) Measure the voltage between the PHEV A/C amp. connector (H_Exp_A1, H_Exp_A2, H_Exp_B1, H_Exp_B2) and body ground.
OK : 1 V or less
Is the inspection result normal?
Repair harness or connector.
 
2.Check of short to ground circuit in drive circuit of the expansion valve (for heating)
Check the continuity between the PHEV A/C amp. connector (H_Exp_A1, H_Exp_A2, H_Exp_B1, H_Exp_B2) and body ground.
OK : No continuity
Is the inspection result normal?
Repair harness or connector.
 
3.Check of open/short to ground circuit in drive circuit of the expansion valve (for heating)
(1) Check the continuity between the PHEV A/C amp. connector (H_Exp_A1 terminal) and (H_Exp_B1 terminal).
OK : No continuity
(2) Check the continuity between the PHEV A/C amp. connector (H_Exp_A1 terminal) and (H_Exp_A2 terminal) or (H_Exp_B1 terminal) and (H_Exp_B2 terminal).
OK : No continuity (8.0 – 10.0 Ω : At 20°C)
Is the inspection result normal?
 
4.Check the expansion valve (for heating)
Check the expansion valve (for heating). Refer to EXPANSION VALVE (FOR HEATING) INSPECTION.
Is the inspection result normal?
Repair harness or connector.
Replace expansion valve (for heating).
 
5.Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to OBD-II Drive Cycle - Pattern 5 OBD-II DRIVE CYCLE.
(2) Check the DTC.
Is the DTC set?
Replace PHEV A/C amp. Refer to Removal and Installation. then
The trouble can be an intermittent malfunction. Refer to General Information - How to Use Troubleshooting/Inspection Service Points, How to Cope with Intermittent Malfunctions HOW TO COPE WITH INTERMITTENT MALFUNCTIONS.
 
6.Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to OBD-II Drive Cycle - Pattern 5 OBD-II DRIVE CYCLE.
(2) Check the DTC.
Is the DTC set?
Replace expansion valve (for heating). Refer to REMOVAL AND INSTALLATION.
INSPECTION END