Diagnostic Test

CHECK FOR OTHER DTCS
1. Using the scan tool, read EVCU DTCs.
  NOTE:
  If DTC P0CED is also set with this DTC, the Power Electronics Cooling Pump Enable Circuit could be shorted to voltage.
  
  Is P0CED also set?
  
  Yes
  - Refer to the DTC INDEX - 500E and perform the P0CED diagnostic procedure.
  No
  - Go To 2
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 3
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to STANDARD PROCEDURE .
CHECK THE (H99) POWER ELECTRONICS COOLING PUMP FEEDBACK CIRCUIT OPEN/HIGH RESISTANCE
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 Feedback circuit between the Power Electronics Cooling Pump harness connector and both EVCU C1 and C2 harness connectors.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 4
  No
  - Repair the open/high resistance in the (H99) Power Electronics Cooling Pump Feedback circuit.
  - Perform the EVCU VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK THE (H99) POWER ELECTRONICS COOLING PUMP FEEDBACK CIRCUIT SHORTED TO GROUND
1. Measure the resistance of the (H99) Power Electronics Cooling Pump Feedback 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. Refer to PUMP, POWER ELECTRONICS COOLANT, REMOVAL .
  - If the DTC resets after Power Electronics Cooling Pump replacement, replace and program the EVCU in accordance with the Service Information. Refer to REMOVAL .
  - Perform the EVCU VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Repair the (H99) Power Electronics Cooling Pump Feedback circuit for a short to ground.
  - Perform the EVCU VERIFICATION TEST. Refer to STANDARD PROCEDURE .