Differential Oil Cooler System — 2016 workshop reference 2677

C5 CHECK FOR CORRECT PCM (POWERTRAIN CONTROL MODULE) OPERATION

Ignition OFF. Disconnect and inspect all PCM connectors. Check for the following:

corrosion (install new connector or terminals - clean module pins) damaged or bent pins - install new terminals/pins pushed-out pins - install new pins as necessary

Reconnect the PCM connectors. Make sure they seat and latch correctly. Operate the system and verify the concern is still present

Is the concern still present?

Yes	CHECK OASIS for any applicable TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSBs address this concern, INSTALL a new PCM. REFER to: Powertrain Control Module (PCM) (303-14D Electronic Engine Controls - 5.2L 32V Ti-VCT, Removal and Installation). PROGRAM the PCM with the latest calibration level. REFER to: Transmission Strategy Download (307-01 Automatic Transmission - 6-Speed Automatic Transmission - 6R80, General Procedures).
No	The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

Yes

CHECK OASIS for any applicable TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSBs address this concern, INSTALL a new PCM. REFER to: Powertrain Control Module (PCM) (303-14D Electronic Engine Controls - 5.2L 32V Ti-VCT, Removal and Installation). PROGRAM the PCM with the latest calibration level. REFER to: Transmission Strategy Download (307-01 Automatic Transmission - 6-Speed Automatic Transmission - 6R80, General Procedures).

The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

The Differential Cooler Pump Never Runs Or Runs Continuously

Refer to Wiring Diagrams Cell 25 for schematic and connector information.

Normal Operation and Fault Conditions

When the differential oil temperature reaches a predetermined level, the PCM grounds the differential oil pump relay which activates the differential oil pump. Once the oil temperature is reduced to another predetermined level, the PCM stops grounding the relay.

Possible Causes

Make sure BJB fuses 46 (20A) and 85 (15A) are OK. Differential oil pump relay PCM

Visual Inspection and Diagnostic Pre-checks

BJB fuse 85 (15A) Make sure the differential oil pump relay is present and fully seated in the BJB .

PINPOINT TEST D : THE DIFFERENTIAL COOLER PUMP NEVER RUNS OR RUNS CONTINUOUSLY

D1 CHECK THE DIFFERENTIAL OIL PUMP OPERATION

Ignition ON. Listen for differential oil pump operation.

Is the differential oil pump operating?

Yes	GO to D2
No	GO to D3

Source reference 2677

2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.