PSCM Circuit Information
WARNING: This page is about a different car, the 2020 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
Refer to the Power Steering Controls wiring diagrams for schematic and connector information. Refer to Steering GSB for additional connector and wiring inspection tips.
NOTE:
Use the correct probe adapters when making measurements. Failure to use the correct probe adapters may cause damage to the connector.
Harness Side
| Circuit | Pin |
|---|---|
| HS-CAN2- (High Speed Controller Area Network 2 Low) - VDB26 | 17 (GRAY) |
| HS-CAN2+ (High Speed Controller Area Network 2 High) - VDB25 | 18 (GREEN) |
Harness Side
| Circuit | Pin |
|---|---|
| HS-CAN2- (High Speed Controller Area Network 2 Low) - VDB26 | 3 (GRAY) |
| HS-CAN2+ (High Speed Controller Area Network 2 High) - VDB25 | 2 (GREEN) |
- BL1: RECHECK FOR DTC U0420 INVALID DATA RECEIVED FROM THE PSCM
- Ignition ON, engine OFF.
- Using a diagnostic scan tool, carry out a self-test of the module reporting DTC U0420:xx.
- Is DTC U0420:xx currently present and active in the reporting module?
Yes No Go to BL2. If the module does NOT list DTC U0420 Invalid Data Received from the PSCM, DISCONTINUE this test and REFER to the DTC Chart for diagnostic direction.
- BL2: CHECK THE VEHICLE BATTERY AND CHARGING SYSTEM VOLTAGE
- Ignition ON, engine OFF.
- Refer to the Charging System General Information article and carry out Pinpoint Test A: Battery Condition Test (battery state of charge).
- Did the battery pass the condition test (battery state of charge)?
Yes No Go to BL3. INSTALL a new 12-volt battery. REFER to the Battery, Mounting and Cables article.
Go to BL3.
- BL3: RECHECK FOR DTC U0420
- Ignition ON, engine OFF.
- Using a diagnostic scan tool, carry out a self-test of the module reporting DTC U0420:xx.
- Is DTC U0420:xx currently present and active in the reporting module?
Yes No Go to BL4. The concern is not present at this time and may have been set due to a low battery state of charge. The test is complete, no further action is required.
- BL4: INSPECT THE PSCM COMMUNICATION WIRING AND CONNECTORS NOTE: The PSCM receives messages from other modules through 2 connectors: the PSCM-A (or B) 3-pin connector at the gear and the multi-pin in-line connector in the engine compartment. The in-line connector receives messages from the other modules into the PSCM wiring harness. The PSCM wiring harness uses the VDB wiring to carry the messages from the in-line connector to the PSCM-A (or B) 3-pin connector. If any of the connector pins or VDB communication wires are loose or damaged, the PSCM cannot properly receive messages from other modules.
- Ignition OFF.
- Disconnect PSCM-A (or B) 3-pin and the in-line electrical connectors.
- Inspect all disconnected connectors for:
- pushed-out pins, loose pins, spread terminals, water ingress and corrosion.
- missing or loose latches, broken or cracked connector housings.
- VDB wiring for pinched or cut wiring under brackets, air cleaner boxes, battery trays, engine pulleys, etc.
- Inspect the VDB wiring for pinched or cut wiring under brackets, air cleaner boxes, battery trays, engine pulleys, etc.
- Inspect the VDB wiring harness anchors for coming loose from anchoring locations in the engine compartment.
- Repair the connectors or wiring as necessary.
- Connect PSCM-A (or B) 3-pin and the in-line electrical connectors.
- Verify connectors are solidly latched and connected without water ingress gaps.
- Verify wiring harness anchors are solidly pushed into retaining holes, etc.
- Ignition ON, engine OFF.
- Using a diagnostic scan tool, clear all DTCs from the module reporting DTC U0420:xx.
- Ignition OFF.
- Ignition ON, engine OFF.
- Using a diagnostic scan tool, carry out a self-test of the module reporting DTC U0420:xx.
- Is DTC U0420:xx currently present and active in the reporting module?
Yes No Go to BL5. The concern is not present at this time and may have been set due to a loose or damaged electrical connector. The test is complete, no further action is required.
- BL5: CHECK THE PSCM HS-CAN CIRCUITS FOR AN OPEN
- Ignition OFF.
- GWM connector disconnected. (C2431)
- BL6: CHECK FOR DTC U0420