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DTC No. P3123-15 Water Pump monitor circuit-High
 
 
 
 
MONITOR EXECUTION
Continuous
 
 
MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)
Other Monitor (There is no temporary DTC set 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
 
 
Check Condition
  • The PHEV-ECU power supply voltage is 11 volts or more.
  • The vehicle status is in Not active, High voltage start, Propulsion system active or Charge system active condition for 1.5 seconds or more.
  • EV power source relay drive signal is ON.
Judgment Criterion
  • The water pump duty status is more than 97% for 3 seconds or more.
 
 
OBD-II DRIVE CYCLE PATTERN
 
 
TROUBLESHOOTING HINTS
  • Malfunction of the electric water pump power supply line (blown fuse)
  • Malfunction of the IGCT control relay
  • Damaged wiring harness and connectors
  • Malfunction of the water/oil pump relay
  • Malfunction of the electric water pump
  • Malfunction of the PHEV-ECU
 
 
DIAGNOSIS
Required Special Tools:
  • MB992744: Vehicle communication interface-Lite (V.C.I.-Lite)
  • MB992745: V.C.I.-Lite main harness A
  • MB992747: V.C.I.-Lite USB cable short
  • MB992748: V.C.I.-Lite USB cable long
  • MB991223: Wiring harness set
  • MB992006: Extra fine probe
1.Check of continuity at electric water pump connector (ground terminal)
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Check the continuity between the electric water pump connector (ground terminal) and body ground.
OK: Continuity exists (2 Ω or less)
Is the check result normal?
Repair the connector(s) or wiring harness in ground line between the electric water pump connector and body ground. Then,
 
2.Voltage measurement at electric water pump connector (power supply terminal)
(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: OFF).
(3) Measure the voltage between the electric water pump connector (power supply terminal) and body ground.
OK: Battery voltage
Is the check result normal?
 
3.Water/Oil pump relay check
Check the water/oil pump relay (Refer to WATER/OIL PUMP RELAY CONTINUITY CHECK).
Is the check result normal?
Replace the water/oil pump relay. Then,
 
4.Voltage measurement at water/oil pump relay connector (contact side upstream terminal)
(1) Remove the water/oil pump relay, and measure at the relay box side.
(2) Measure the voltage between the water/oil pump relay connector (contact side upstream terminal) and body ground.
OK: Battery voltage
Is the check result normal?
Repair the faulty part. Then,
 
5.Voltage measurement at water/oil pump relay connector (excitation side upstream terminal)
(1) Remove the water/oil pump relay, and measure at the relay box side.
(2) Change the power supply mode of the electric motor switch to ON (READY indicator: OFF).
(3) Measure the voltage between the water/oil pump relay connector (excitation side upstream terminal) and body ground.
OK: Battery voltage
Is the check result normal?
Repair the faulty part. Then,
 
6.Check of open circuit in power supply line between electric water pump and relay box (water/oil pump relay)
Is the check result normal?
Repair the connector(s) or wiring harness. Then,
 
7.Check of open circuit in WPR line between PHEV-ECU and relay box (water/oil pump relay)
Is the check result normal?
Repair the connector(s) or wiring harness. Then,
 
8.Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to OBD-II Drive Cycle OBD-II DRIVE CYCLE.
(2) Check the DTC.
Is the DTC set?
Replace the PHEV-ECU (Refer to PHEV-ECU 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).
 
9.Check of open circuit in WPN line between PHEV-ECU and electric oil pump
Is the check result normal?
Repair the connector(s) or wiring harness. Then,
 
10.Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to OBD-II Drive Cycle OBD-II DRIVE CYCLE.
(2) Check the DTC.
Is the DTC set?
Replace the electric water pump (Refer to WATER PUMP REMOVAL AND INSTALLATION), Then go to .
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).
 
11.Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to OBD-II Drive Cycle OBD-II DRIVE CYCLE.
(2) Check the DTC.
Is the DTC set?
Replace the PHEV-ECU (Refer to PHEV-ECU REMOVAL AND INSTALLATION). Then,
The procedure is complete.
 
12.Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to OBD-II Drive Cycle OBD-II DRIVE CYCLE.
(2) Check the DTC.
Is the DTC set?
Retry the troubleshooting.
The procedure is complete.