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DTC No. P0940-00 Hydraulic Oil Temperature Sensor Circuit High
 
 
 
 
DTC SET CONDITION
Check Condition
  • The power supply mode of the electric motor switch is ON.
Judgment Criterion
  • The high input of the transaxle fluid temperature sensor signal is detected.
 
 
TROUBLESHOOTING HINTS
  • Damaged wiring harness and connectors
  • Malfunction of the transaxle fluid temperature sensor
  • 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 transaxle fluid temperature sensor connector (OTSG terminal)
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Check the continuity between the EV coolant temperature sensor connector (OTSG terminal) and body ground.
OK: Continuity exists (2 Ω or less)
Is the check result normal?
 
2.Check of open circuit in OTSG line between PHEV-ECU and transaxle fluid temperature sensor
Is the check result normal?
Repair the connector(s) or wiring harness.
 
3.Voltage measurement at transaxle fluid temperature sensor connector (OTS 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 transaxle fluid temperature sensor connector (OTS terminal) and body ground.
OK: Approximately 5 V
Is the check result normal?
 
4.Check of open circuit in OTS line between PHEV-ECU and transaxle fluid temperature sensor
Is the check result normal?
Repair the connector(s) or wiring harness.
 
5.Check wiring harness and connectors for damage.
Check the wiring harness and connectors in OTS line between PHEV-ECU and transaxle fluid temperature sensor for damage.
Is the check result normal?
Repair the connector(s) or wiring harness.
 
6.Check the transaxle fluid temperature sensor.
Check the transaxle fluid temperature sensor (Refer to Front Transaxle – On-vehicle Service TRANSAXLE FLUID TEMPERATURE SENSOR CHECK).
Is the check result normal?
Replace the transaxle fluid temperature sensor (Refer to Transaxle Overhaul – Front Transaxle DISASSEMBLY AND ASSEMBLY).
 
7.Check whether the DTC is set again.
Is the DTC set?
Replace the PHEV-ECU (Refer to PHEV-ECU 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).