Pinpoint Test J: DTC P0AFA:16 or P0AFB:17
Climate Control System
Pinpoint Tests
Pinpoint Test J: DTC P0AFA:16 or P0AFB:17
Refer to Wiring Diagram Set 55 (Escape/Mariner, Escape Hybrid/Mariner Hybrid), Automatic Climate Control System for schematic and connector information. Diagrams By Number
Normal Operation
Under normal operation, the Air Conditioning Compressor Module (ACCM) receives hybrid battery system voltage through circuit HYT03 (OG/WH). Circuit HYT03 (OG/WH) has a non-serviceable fuse in the high voltage wiring harness between the Battery Control Module (BCM) and ACCM. The ACCM is grounded through circuit HYT04 (OG/BK).
- DTC P0AFA:16 (Hybrid Battery System Voltage Low: Circuit Voltage Below Threshold) - The module senses when hybrid battery system voltage is less than 165 volts.
- DTC P0AFB:17 (Hybrid Battery System Voltage High: Circuit Voltage Above Threshold) - The module senses when hybrid battery system voltage is greater than 450 volts.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- ACCM
PINPOINT TEST J: DTC P0AFA:16 OR P0AFB:17
NOTE: Before carrying out the following test, diagnose any PCM DTCs.
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J1 COMPARE THE ACCM HIGH VOLTAGE PID WITH THE BCM HIGH VOLTAGE PID
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Battery Pack Voltage (V_PACK) Battery Control Module (BCM) PID .
- Enter the following diagnostic mode on the scan tool: Electric A/C Compressor High Voltage Supply (ACCM_CHVS) Air Conditioning Compressor Module (ACCM) PID .
- Compare the V_PACK BCM PID voltage with the ACCM_CHVS ACCM PID voltage.
- Are both voltages approximately the same?
Yes
CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. If the DTCs return, INSTALL a new ACCM. TEST the system for normal operation. If the DTCs do not return, the system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
No
GO to J2.
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J2 CHECK CIRCUIT HYT03 (OG) FOR AN OPEN
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.
- Ignition OFF.
- Depower the high-voltage traction battery system. For additional information, refer to Hybrid Drive Systems.
- Disconnect: BCM C4227B.
- Disconnect: ACCM C1469B.
- Disconnect: Transmission Control Module (TCM) C1458D.
- Measure the resistance between ACCM C1469B, circuit HYT03 (OG), harness side and BCM C4227B, circuit HYT03 (OG), harness side
- Is the resistance less than 5 ohms?
Yes
INSPECT the ACCM for loose or corroded connections. If OK, INSTALL a new ACCM. TEST the system for normal operation.
No
INSPECT the high-voltage harness for damage. If the high-voltage harnessis damaged, INSTALL a new high-voltage harness only. If the high-voltage harness is not damaged, INSTALL a new high-voltage harness and INSTALL a new ACCM. TEST the system for normal operation.
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