Diagnostic Test

CHECK IF DTC IS CURRENT
1. Using the scan tool, read EVCU DTCs.
2. Record the Environmental Data and any DTCs.
3. Clear DTCs.
4. Using the recorded Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
5. Read EVCU DTCs.
  Did the DTC reset?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to STANDARD PROCEDURE .
CHECK THE (H99) POWER ELECTRONICS COOLING PUMP PWM CIRCUIT SHORTED TO GROUND
1. Turn the ignition off. Remove the key from the Ignition Switch, close doors and allow the EVCU to shut down.
  NOTE:
  Allow up to two minutes for the EVCU to shut down. Opening the vehicle door will interrupt the shut down process.
2. Disconnect the EVCU C1 and C2 harness connectors.
3. Disconnect the Power Electronics Cooling Pump harness connector.
4. Measure the resistance of the (H99) Power Electronics Cooling Pump PWM circuit between ground and both EVCU C1 and C2 harness connectors.
  Is the resistance above 100k Ohms?
  
  Yes
  - Using the schematics as a guide, check the Power Electronics Cooling Pump pins, terminals, and connectors for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the Power Electronics Cooling Pump in accordance with the Service Information.
  - If the DTC resets after Power Electronics Cooling Pump replacement, replace and program the EVCU in accordance with the Service Information. Refer to UNIT, ELECTRIC VEHICLE CONTROL (EVCU), REMOVAL .
  - Perform the EVCU VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Repair the (H99) Power Electronics Cooling Pump PWM circuit for a short to ground.
  - Perform the EVCU VERIFICATION TEST. Refer to STANDARD PROCEDURE .