Are any damage, blockages or restrictions present?
Yes | REPAIR or INSTALL new components as necessary. |
|---|---|
No | INSTALL a new differential cooler oil pump. REFER to: Oil Pump (205-02 Rear Drive Axle/Differential, Removal and Installation). |
DTC P188E
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.
DTC Fault Trigger Conditions
DTC | Description | Fault Trigger Conditions |
|---|---|---|
P188E Oil Pressure Pump Control Circuit | This DTC sets in continuous memory and on-demand when the PCM detects a short to ground or an open in the differential oil pump relay control circuit. Also, an open in the relay or the relay power supply circuit can cause this DTC to set. |
Possible Causes
Fuse Wiring, terminals or connectors Differential oil pump relay PCM
Visual Inspection and Diagnostic Pre-checks
Make sure BJB fuse 46 (20A) and fuse 85 (15A) are OK Make sure the differential oil pump relay is present and fully seated in the BJB.
PINPOINT TEST C : DTC P188E
C1 CHECK THE VOLTAGE TO THE DIFFERENTIAL OIL PUMP RELAY
Ignition OFF. Disconnect Differential Oil Pump Relay . Measure:
Click to display connectors
Positive Lead | Measurement / Action | Negative Lead |
|---|
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.