Diagnostic Test

CHECK FOR AN ACTIVE DTC 

Read the HIGH-VOLTAGE SAFETY PROCEDURES. Refer to  HIGH VOLTAGE SAFETY PROCEDURES  . 

When the HIGH-VOLTAGE POWER-DOWN PROCEDURE is necessary. Refer to  VEHICLE HIGH VOLTAGE POWER DOWN  . 

1. With the scan tool, read Electric Vehicle Control Unit (EVCU) DTCs and record on the repair order.
2. Record the Freeze Frame Data (If available), Event Data (If available), and Environmental Data.
3. With the scan tool, erase DTCs.
4. Using the recorded data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
5. With the scan tool, read EVCU DTCs.

   Did the DTC return?

   Yes 

   • With the scan tool, review the Environmental Data and Compressor Fault Status Values in the EVCU. Using this value, perform the specific diagnostic test for the condition.

   • ENVIRONMENTAL DATA	POSSIBLE CAUSES	DIAGNOSTIC TEST
     NO FAULT	CAN C EPT COMMUNICATION DTCS AMBIENT TEMPERATURE TOO LOW TO OPERATE THE EAC SLUGGING PROTECTION CONTROL ENABLED ELECTRIC A/C COMPRESSOR (EAC)	CHECK FOR CAN C EPT DTCS, REPAIR AS NECESSARY AND RETEST. CHECK FOR COLD AMBIENT TEMPERATURES DURING USAGE. IF LOW TEMPERATURE USAGE WAS PRESENT, LOW TEMPERATURE PROTECTION ENABLED, NO REPAIR NECESSARY. GO TO STEP 3 OPERATE THE A/C SYSTEM AND RECORD DTCS. IF THE DTC RETURNS REPLACE THE ELECTRIC A/C COMPRESSOR (EAC) IN ACCORDANCE WITH THE SERVICE INFORMATION.
     UNDER VOLTAGE	OTHER UNDER VOLTAGE DTCS SET HIGH RESISTANCE IN HV CABLES OR HV CONNECTIONS LOW HIGH VOLTAGE BATTERY ELECTRIC A/C COMPRESSOR (EAC)	CHECK FOR UNDERVOLTAGE DTCS. REPAIR AS NECESSARY AND RETEST. WITH THE SCAN TOOL, COMPARE THE BATTERY PACK VOLTAGES TO THE EAC. IF THE VOLTAGE IS EQUAL GO TO NEXT STEP. IF NOT, CHECK HV CABLES TO THE EAC. REPAIR AS NECESSARY OPERATE THE A/C SYSTEM AND RECORD DTCS. IF THE DTC RETURNS REPLACE THE ELECTRIC A/C COMPRESSOR (EAC) IN ACCORDANCE WITH THE SERVICE INFORMATION.
     OVER VOLTAGE	HIGH VOLTAGE BATTERY CHARGING STATION SYSTEM VOLTAGE HIGH OVER VOLTAGE DTCS IN OTHER MODULES POOR HV CABLES OR HV CONNECTIONS	ASK THE CUSTOMER IF THE CHECK ENGINE LIGHT HAPPENED AFTER CHARGING FROM THE CHARGE PORT. IF SO, INFORM CUSTOMER OF POSSIBLE CHARGING STATION PROBLEMS. CHECK FOR OTHER HIGH VOLTAGE DTCS, REPAIR AS NECESSARY. WITH THE SCAN TOOL, COMPARE THE BATTERY PACK VOLTAGES TO THE EAC. IF THE VOLTAGE IS EQUAL GO TO NEXT STEP. IF NOT, CHECK HV CABLES TO THE EAC. REPAIR AS NECESSARY DOUBLE CHECK ALL HV CABLES AND CONNECTIONS
     OVER TEMPERATURE	A/C HIGH PRESSURE SIDE HIGH LOW RADIATOR AIR FLOW/HIGH UNDERHOOD AMBIENT TEMP CONTINUOUS LOW COMPRESSOR OPERATING SPEED LOW A/C CHARGE BLOCKED REFRIGERANT FLOW (EVAPORATOR ICING OR EVAPORATOR DEBRIS)	CHECK THE RADIATOR COOLING FAN FOR OPERATION. REPAIR AS NECESSARY. CONNECT AN APPROVED A/C RECOVERY MACHINE TO THE A/C SYSTEM. CHECK THE A/C HIGH AND LOW PRESSURE GAUGES ON THE RECOVERY MACHINE. IF THE PRESSURES ARE HIGH, CORRECT THE CAUSE OF THE HIGH A/C PRESSURE. IF LOW, GO TO STEP 3. CHECK THE A/C SYSTEM STATE OF CHARGE. IF LOW, CHECK FOR LEAKS AND RETEST. CHECK EVAPORATOR ICING OR DEBRIS.
     INPUT CONTROL	A/C HIGH PRESSURE SIDE HIGH LOW RADIATOR AIR FLOW/HIGH UNDERHOOD AMBIENT TEMPERATURES CONTINUOUS LOW COMPRESSOR OPERATING SPEED LOW A/C CHARGE EVAPORATOR ICING OR DEBRIS	CHECK THE RADIATOR COOLING FAN FOR OPERATION. REPAIR AS NECESSARY. CONNECT AN APPROVED A/C RECOVERY MACHINE TO THE A/C SYSTEM. CHECK THE A/C HIGH AND LOW PRESSURE GAUGES ON THE RECOVERY MACHINE. IF THE PRESSURES ARE HIGH, CORRECT THE CAUSE OF THE HIGH A/C PRESSURE. IF LOW, GO TO STEP 3. CHECK THE A/C SYSTEM STATE OF CHARGE. IF LOW, CHECK FOR LEAKS AND RETEST. IF OK GO TO STEP 4. CHECK EVAPORATOR ICING OR DEBRIS.
     CURRENT FAULT	LOW RADIATOR AIR FLOW/HIGH UNDERHOOD TEMPERATURES HIGH COMPRESSOR LOAD DUE TO LOW REFRIGERANT CHARGE EVAPORATOR ICING OR DEBRIS	CHECK THE RADIATOR COOLING FAN FOR OPERATION. REPAIR AS NECESSARY. CONNECT AN APPROVED A/C RECOVERY MACHINE TO THE A/C SYSTEM. CHECK THE A/C HIGH AND LOW PRESSURE GAUGES ON THE RECOVERY MACHINE. IF THE PRESSURES ARE HIGH, CORRECT THE CAUSE OF THE HIGH A/C PRESSURE. IF LOW, GO TO STEP 3. CHECK THE A/C SYSTEM STATE OF CHARGE. IF LOW, CHECK FOR LEAKS AND RETEST. CHECK EVAPORATOR ICING OR DEBRIS.
     INTERNAL FAULT	UNDER VOLTAGE DTCS SET IN OTHER MODULES OPEN CONTACTORS IN THE BATTERY PACK CONTROL MODULE (BPCM) OPEN EAC HV FUSE ELECTRIC AIR-CONDITIONING COMPRESSOR (EAC) INTERNAL FAILURE	CHECK FOR OTHER HIGH VOLTAGE DTCS, REPAIR AS NECESSARY. WITH THE SCAN TOOL, COMPARE THE BATTERY PACK VOLTAGES TO THE EAC. IF THE VOLTAGE IS EQUAL GO TO NEXT STEP. IF NOT, CHECK HV CABLES TO THE EAC. REPAIR AS NECESSARY. WITH THE SCAN TOOL, CHECK THE CONTACTOR STATUS IN THE BPCM. IF OPEN, REPLACE THE HV BATTERY PACK. IF OK, GO TO STEP 4. CHECK THE EAC FUSE. IF OPEN, REPLACE THE FUSE AND EAC. INSPECT EAC WIRING, REPAIR AS NECESSARY. IF OK GO TO STEP 5. OPERATE THE A/C SYSTEM AND RECORD DTCS. IF THE DTC RETURNS REPLACE THE ELECTRIC A/C COMPRESSOR (EAC) IN ACCORDANCE WITH THE SERVICE INFORMATION.
     ROTOR LOCK	EXCESSIVE UNDERHOOD TEMPERATURE BLOCKAGE IN A/C SYSTEM INSUFFICIENT BLOWER MOTOR AIR FLOW ELECTRIC A/C COMPRESSOR (EAC)	CHECK THE RADIATOR COOLING FAN FOR OPERATION. REPAIR AS NECESSARY. CONNECT AN APPROVED A/C RECOVERY MACHINE TO THE A/C SYSTEM. CHECK THE A/C HIGH AND LOW PRESSURE GAUGES ON THE RECOVERY MACHINE. IF THE PRESSURES ARE HIGH, CORRECT THE CAUSE OF THE HIGH A/C PRESSURE. IF LOW, GO TO STEP 3. CHECK THE A/C SYSTEM STATE OF CHARGE. IF LOW, CHECK FOR LEAKS AND RETEST. CHECK EVAPORATOR ICING OR DEBRIS. CHECK BLOWER MOTOR OPERATION.
     EAC LOSS OF COM WITH HCP	OTHER LIN BUS DTCS RELATING TO A LIN BUS CONCERN LIN BUS CIRCUITS OPEN OR SHORTED TO GROUND	CHECK FOR LIN BUS DTCS, REPAIR AS NECESSARY AND RETEST. CHECK THE LIN BUS CIRCUIT TO THE EAC FOR OPENS OR SHORTS. IF OPEN OR SHORTED, REPAIR AS NECESSARY AND RETEST. CHECK THE GROUND CIRCUITS TO THE EAC. IF OPEN, REPAIR AS NECESSARY AND RETEST. CHECK THE B+ CIRCUIT TO THE EAC. IF OPEN, REPAIR AS NECESSARY AND RETEST.
     LOSS OF COMMUNICATION WITH ORC	FUSED B+ CIRCUIT OPEN OR SHORTED TO THE ORC FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN OR SHORTED TO THE ORC GROUND CIRCUIT OPEN TO THE ORC CAN C BUS CIRCUIT(S) OPEN OR HIGH RESISTANCE OCCUPANT RESTRAINT CONTROLLER (ORC) MODULE	CHECK THE B+ FEED TO THE ORC. IF OPEN, REPAIR AS NECESSARY AND RETEST. CHECK THE FUSED IGNITION SWITCH OUTPUT CIRCUIT TO THE ORC. IF OPEN, REPAIR AS NECESSARY AND RETEST. CHECK THE GROUND CIRCUITS TO THE ORC. IF OPEN, REPAIR AS NECESSARY AND RETEST. CHECK THE CAN C BUS CIRCUITS TO THE ORC. IF OPEN, REPAIR AS NECESSARY AND RETEST.

• Perform the Electric Vehicle Control Unit (EVCU) VERIFICATION TEST. Refer to ELECTRIC VEHICLE CONTROL UNIT (EVCU) VERIFICATION TEST .

No 

• Perform the TESTING FOR AN INTERMITTENT CONDITION procedure. Refer to TESTING FOR AN INTERMITTENT CONDITION .