Pinpoint Test O: DTC P0AE1 - Hybrid Battery Precharge Contactor Circuit
High-Voltage Traction Battery
Pinpoint Tests
Pinpoint Test O: DTC P0AE1 - Hybrid Battery Precharge Contactor Circuit
Normal Operation
When the ignition is turned on, the Battery Control Module (BCM) makes various vehicle checks. If these checks are normal, the BCM sends a signal to the contactor to close, which will supply high-voltage power to the vehicle. If a precharge contactor overcurrent condition is sensed by the BCM, the stop safely hazard (red triangle) warning indicator is illuminated and the vehicle will shut down and/or not start.
This DTC can set as a result of a discharged 12-volt battery, a fault on the DC/DC converter enable circuit, a fault on the high-voltage bus, the Electronically Controlled Continuously Variable Transmission (eCVT) or the high-voltage wiring.
- DTC P0AE1 (Hybrid Battery Precharge Contactor Circuit) - If the precharge contactor attempts to close and current flow exceeds set values, DTC P0AE1 will set. This could indicate a short in the high-voltage system.
This pinpoint test is intended to diagnose the following:
- High-voltage cable assembly
- BCM
- High Voltage Traction Battery (HVTB)
- eCVT
PINPOINT TEST O: DTC P0AE1 - HYBRID BATTERY PRECHARGE CONTACTOR CIRCUIT
WARNING: To prevent the risk of high-voltage shock, always follow precisely all warnings and service instructions, including instructions to depower the system. The high-voltage hybrid system utilizes approximately 300 volts DC, provided through high-voltage cables to its components and modules. The high-voltage cables and wiring are identified by orange harness tape or orange wire covering. All high-voltage components are marked with high-voltage warning labels with a high-voltage symbol. Failure to follow these instructions may result in serious personal injury or death.
NOTICE: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes.
-------------------------------------------------
O1 CHECK FOR PCM AND TCM DTCs
- Connect the scan tool.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Self Test - PCM.
- Enter the following diagnostic mode on the scan tool: Self Test - Transmission Control Module (TCM).
- Is DTC P0A10 or P0A11 present in the PCM or is DTC P0A78 or P0A7A present in the TCM?
Yes
REFER to Computers and Control Systems Information to diagnose those DTCs first.
No
GO to O2.
-------------------------------------------------
O2 CHECK THE 12-VOLT BATTERY CONDITION
- Refer to Battery and carry out Pinpoint Test A: Battery Condition Test to determine if the battery can hold a charge and is OK for use. Pinpoint Tests
- Does the 12-volt battery pass the condition test?
Yes
GO to O3.
No
INSTALL a new battery. REFER to Battery. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
-------------------------------------------------
O3 CHECK HIGH-VOLTAGE CABLE CONTINUITY BETWEEN THE TRACTION BATTERY AND THE TRANSMISSION
- Ignition OFF.
- Depower the HVTB system. Refer to High-Voltage Traction Battery Systems Depowering Service and Repair.
- Disconnect: Traction Battery Control Module (TBCM) C4227C.
- Disconnect: TCM C1458D.
- Measure the resistance between TBCM C4227C-(+), circuit HYT03 (OG), harness side, and TCM C1458D-(+), circuit HYT03 (OG), harness side, and between TBCM C4227C-(-), circuit HYT04 (OG), harness side, and TCM C1458D-(-), circuit HYT04 (OG), harness side.
- Are the resistances less than 5 ohms?
Yes
GO to O4.
No
INSTALL a new HVTB-to-eCVT high-voltage cable.
REFER to High-Voltage Cables Service and Repair. CLEAR the DTCs. REPEAT the self-test.
-------------------------------------------------
O4 CHECK FOR A SHORT TO GROUND IN THE TRANSMISSION
NOTE: Due to circuit components internal to the eCVT, the resistance reading may fluctuate and/or take several seconds before an actual measurement can be made.
- Disconnect: Transaxle Control Module C1458E.
- Measure the resistance between TCM C1458E pin-(+), circuit HYT03 (OG), component side and ground, and between TCM C1458E pin-(-), circuit HYT04 (OG), component side and ground
- Is the resistance greater than 50 ohms?
Yes
GO to O5.
No
INSTALL a new eCVT. REFER to Automatic Transmission/Transaxle &/or Transmission Control Systems. CLEAR the DTCs.
REPEAT the self-test.
-------------------------------------------------
O5 CHECK FOR A SHORT TOGETHER IN THE TRANSMISSION
NOTE: Due to circuit components internal to the eCVT, the resistance reading may fluctuate and/or take several seconds before an actual measurement can be made.
- Measure the resistance between TCM C1458E pin-(+), circuit HYT03 (OG), component side, and TCM C1458E pin-(-), circuit HYT04 (OG), component side.
- Is the resistance greater than 50 ohms?
Yes
GO to O6.
No
INSTALL a new eCVT. REFER to Automatic Transmission/Transaxle &/or Transmission Control Systems. CLEAR the DTCs.
REPEAT the self-test.
-------------------------------------------------
O6 CHECK FOR A SHORT IN THE DC/DC CONVERTER OR WIRING
- Measure the resistance between TCM C1458E-(+), circuit HYT03 (OG), harness side, and TCM C1458E-(-), circuit HYT04 (OG), harness side.
- Measure the resistance between TCM C1458E-(+), circuit HYT03 (OG), harness side and ground, and between TCM C1458E-(-), circuit HYT04 (OG), harness side and ground.
- Is the resistance greater than 10,000 ohms?
Yes
GO to O8.
No
GO to O7.
-------------------------------------------------
O7 CHECK FOR A SHORT IN THE DC/DC CONVERTER WIRING HARNESS
- Disconnect: DC/DC Converter C1457D.
- Measure the resistance between TCM C1458E-(+), circuit HYT03 (OG), harness side, and TCM C1458E-(-), circuit HYT04 (OG), harness side.
- Measure the resistance between TCM C1458E-(+), circuit HYT03 (OG), harness side and ground, and between TCM C1458E-(-), circuit HYT04 (OG), harness side and ground.
- Is the resistance greater than 10,000 ohms?
Yes
INSTALL a new DC/DC converter. REFER to Hybrid Drive Systems. CLEAR the DTCs. REPEAT the self-test.
No
INSTALL a new DC/DC converter wiring harness. REFER to Hybrid Drive Systems. CLEAR the DTCs. REPEAT the self-test.
-------------------------------------------------
O8 CHECK FOR VOLTAGE AT THE TBCM
- Disconnect: TBCM C4227A.
- Ignition ON.
- Measure the voltage between each of the following pins and ground:
- C4227A-4, circuit SBB15 (WH/RD), harness side
- C4227A-5, circuit SBB15 (WH/RD), harness side
- C4227A-6, circuit SBB15 (WH/RD), harness side
- C4227A-10, circuit SBB05 (GY/RD), harness side
- C4227A-11, circuit SBB05 (GY/RD), harness side
- C4227A-19, circuit CBB23 (BN/YE), harness side
- Is the voltage greater than 10 volts?
Yes
GO to O9.
No
If voltage is not present on pin 4, 5 or 6, VERIFY Battery Junction Box (BJB) fuse 15 (50A) is OK. If the fuse is OK, REPAIR circuit SBB15 (WH/RD).
If voltage is not present on pin 10 or 11, VERIFY BJB fuse 5 (10A) is OK. If the fuse is OK, REPAIR circuit SBB05 (GY/RD).
If voltage is not present on pin 19, VERIFY BJB fuse 23 (5A) is OK. If the fuse is OK, REPAIR circuit CBB23 (BN/YE).
If any fuse is not OK, Refer to the Wiring Diagrams to identify the possible causes of the circuit short. Diagrams By Number
CLEAR the DTCs. REPEAT the self-test.
-------------------------------------------------
O9 CHECK FOR CORRECT HVTB OPERATION
- Ignition OFF.
- Check TBCM C4227A, TCM C1458E, DC/DC converter C1457D, TBCM C4227C, and TCM C1458D for:
- corrosion.
- pushed-out pins.
- spread terminals.
- Connect: TBCM C4227A.
- Connect: TBCM C4227C.
- Connect: TCM C1458D.
- Connect: TCM C1458E.
- Connect: DC/DC converter C1457D.
- Make sure the connectors seat correctly before operating the system.
- Connect the scan tool.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Self Test - BCM.
- Is DTC P0AE1 present?
Yes
INSTALL a new HVTB. REFER to High-Voltage Traction Battery Removal and Replacement. CLEAR the DTCs. REPEAT the self-test.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.
-------------------------------------------------