Diagnostic Test

WARNING: This page is about a different car, the 2025 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

READ AND RECORD DTCS AND ENVIRONMENTAL DATA - ERASE DTCS AND CHECK FOR DTC TO RETURN
WARNING:
On vehicles equipped with the high voltage system, you must thoroughly read and follow all High Voltage Safety procedures. In addition, before performing any diagnostic or service procedure near a high voltage component, you must perform the High Voltage Power Down. Failure to follow these instructions may result in possible serious or fatal injury.

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

When the HIGH-VOLTAGE POWER-DOWN PROCEDURE is necessary. Refer to HIGH VOLTAGE POWER DOWN .
1. With the scan tool, read DTCs in all Electronic Control Units (ECUs) and record on the repair order.
2. For future reference, with the scan tool, run and save a vehicle Scan Report and all related recorded data.
3. With the scan tool, erase all DTCs.
4. Turn the ignition off for a minimum of 10.0 seconds.
5. Turn the ignition on.
6. Using the When Monitored and Set Conditions above and recorded data, operate the vehicle in the conditions that set the DTC.
7. With the scan tool, read DTCs.
  Did the DTC return?
  
  Yes
  - Go To 2
  No
  - Perform the appropriate INTERMITTENT CONDITION diagnostic procedure. Refer to TESTING FOR AN INTERMITTENT CONDITION .
CHECK FOR OTHER HIGH VOLTAGE DTCS
1. Refer to the recorded DTCs.
  Are there any High Voltage DTCs set in the PCM, HCP, BPCM, ABM and IDCM
  
  Yes
  - Repair High Voltage DTCs.
  - Perform the Hybrid Control Processor (HCP) VERIFICATION TEST. Refer to HYBRID CONTROL PROCESSOR (HCP) VERIFICATION TEST .
  No
  - Go To 3
CHECK CONTACTOR STATUS IN THE BATTERY PACK CONTROL MODULE (BPCM)
1. With the scan tool, check the HV contactor status in the BPCM.
  Are all of the HV contactors closed?
  
  Yes
  - Go To 4
  No
  - Replace the Battery Pack Control Module in accordance with the service information. Refer to MODULES, HIGH VOLTAGE SYSTEM, REMOVAL AND INSTALLATION .
  - Perform the Hybrid Control Processor (HCP) VERIFICATION TEST. Refer to HYBRID CONTROL PROCESSOR (HCP) VERIFICATION TEST .
CHECK THE HIGH VOLTAGE DATA IN THE BATTERY PACK CONTROL MODULE (BPCM) AND ELECTRIC A/C COMPRESSOR (EAC)
1. With the scan tool, read the High Voltage data in the BPCM AND EAC.
  NOTE:
  Make sure that the EAC Fuse is not open.
  
  Are the voltages equal to each other?
  
  Yes
  - Go To 5
  No
  - Using the wiring diagram as a guide repair the High Voltage power supply to the EAC.
  - Perform the Hybrid Control Processor (HCP) VERIFICATION TEST. Refer to HYBRID CONTROL PROCESSOR (HCP) VERIFICATION TEST .
ELECTRIC A/C COMPRESSOR (EAC)
1. Reconnect any previously disconnected wire harness connections and prepare the vehicle for power up.
2. Turn the ignition on, not in ready mode.
3. Using the scan tool, record current DTCs and environmental data and erase EAC DTCs.
4. Turn the ignition off. Wait one minute.
5. Turn the ignition on. Wait one minute.
6. Using the scan tool, read DTCs.
  Does the scan tool display this DTC as active?
  
  Yes
  - Verify proper operation of the High Voltage Battery Pack Assembly. If Battery Pack Assembly is OK, Replace the Electric A/C Compressor in accordance with the service information. Refer to COMPRESSOR, A/C, REMOVAL AND INSTALLATION .
  - Perform the Hybrid Control Processor (HCP) VERIFICATION TEST. Refer to HYBRID CONTROL PROCESSOR (HCP) VERIFICATION TEST .
  No
  - Repair is complete.
  - Perform the Hybrid Control Processor (HCP) VERIFICATION TEST. Refer to HYBRID CONTROL PROCESSOR (HCP) VERIFICATION TEST .