DTC P1437 (41)

DTC P1437  : Traction Motor Inverter Short

WARNING: 

This procedure includes high voltage measurements with the electric powertrain system turned on. To avoid serious injury from electrical shocks while testing the high voltage cable, use insulated gloves, select a DC range of 500 V or more on your digital multimeter, and be careful not to contact each tester probes and not to contact any metal parts while you measure the high voltage cable.

NOTE:  Before you troubleshoot, review the general troubleshooting information .

DTC (Electric Powertrain)

1. Problem verification

   -1. Turn the vehicle to the ON mode.

   -2. Clear the DTC with the HDS.

   -3. Turn the vehicle to the OFF (LOCK) mode.

   -4. Turn the vehicle to the READY TO DRIVE mode.

   -5. Position to D, and release the brake pedal.

   -6. Check for Pending or Confirmed DTCs with the HDS.

   DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
   P1437 Traction Motor Inverter Short

   Is DTC P1437 indicated?

   YES 

   Go to step 3

   NO 

   Go to step 2

2. DTC check

   -1. Check for Pending or Confirmed DTCs with the HDS.

   DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
   P1440 Traction Motor Inverter Gate Line Open

   Is DTC P1440 indicated?

   YES 

   Go to the DTC P1440 troubleshooting .

   NO 

   Intermittent failure. The system is OK at this time. If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot.

3. Traction motor check

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Remove the service plug .

   -3. Remove the PCU .

   -4. At the traction motor 3-phase terminals side, measure the resistance between the following test points individually.

   Test condition	Vehicle OFF (LOCK) mode
   	PCU: removed

   NOTICE: 

   When measuring terminals, make sure to use an ohmmeter that is capable of measuring milli-ohm range. Make sure to take the measurement when the transmission temperature is about 68°F (20°C) (rated resistance value is at 68°F (20°C)) as the resistance figures may vary.

   Connector	Terminals	Value (mΩ)
   Traction motor high voltage terminals	U - V	About 38.4-40.4
   	U - W	About 38.4-40.4

   Courtesy of HONDA, U.S.A., INC.

   Is resistance value OK?

   YES 

   Go to step 4.

   NO 

   Faulty traction motor. Replace the transmission (e-CVT) assembly .

4. Traction motor motor rotor position sensor circuit check

   -1. Do the traction motor motor rotor position sensor circuit check .

   Is it OK?

   YES 

   Replace the PCU and the transmission (e-CVT) assembly .

   NO 

   Repair an open or short in the traction motor motor rotor position sensor circuit between the PCU and the traction motor motor rotor position sensor.