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P1C02-71 Low Pressure 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 low pressure magnetic A/C valve circuit is detected for 4 seconds or more.
 
 
OBD-II DRIVE CYCLE PATTERN
 
 
PROBABLE CAUSES
  • Malfunction of harness and connectors
  • Malfunction of low pressure magnetic A/C valve
  • Malfunction of PHEV A/C amp.
 
 
DIAGNOSIS PROCEDURE
1.Check the low pressure magnetic A/C valve
Check the low pressure magnetic A/C valve. Refer to LOW PRESSURE MAGNETIC A/C VALVE INSPECTION.
Is the inspection result normal?
Replace low pressure magnetic A/C valve. Refer to Removal and Installation.
 
2.Voltage measurement at low pressure magnetic A/C valve connector (terminal No.1)
(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 low pressure magnetic A/C valve connector (terminal No.1) and body ground.
OK : Battery power supply
Is the inspection result normal?
Repair harness or connector.
 
3.Voltage measurement at low pressure magnetic A/C valve connector (terminal No.2)
(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 low pressure magnetic A/C valve connector (terminal No.2) and body ground.
OK : 1 V or less
Is the inspection result normal?
Repair harness or connector.
 
4.Check of open/short to ground circuit in HT_MGV line between PHEV A/C amp. and low pressure magnetic A/C valve
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Check the continuity between the PHEV A/C amp. connector (HT_MGV terminal) and body ground.
OK : No continuity
(3) Check the continuity between the PHEV A/C amp. connector (HT_MGV terminal) and low pressure magnetic A/C valve.
OK : Continuity exists (2 Ω or less)
Is the inspection result normal?
Repair harness or connector.
 
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.
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.