Pinpoint Test G: The Power Steering Control Module (PSCM) Does Not Respond To The Scan Tool

Communications Network

Pinpoint Tests

Pinpoint Test G: The Power Steering Control Module (PSCM) Does Not Respond To The Scan Tool

Refer to Wiring Diagram Set 14 (Escape/Mariner, Escape Hybrid/Mariner Hybrid), Module Communications Network for schematic and connector information. Diagrams By Number

Refer to Wiring Diagram Set 43 (Escape/Mariner, Escape Hybrid/Mariner Hybrid), Power Steering Controls for schematic and connector information. Diagrams By Number

Normal Operation

The Power Steering Control Module (PSCM) communicates with the scan tool through the High Speed Controller Area Network (HS-CAN).

This pinpoint test is intended to diagnose the following:

- Fuse
- Wiring, terminals or connectors
- PSCM


PINPOINT TEST G: THE PSCM DOES NOT RESPOND TO THE SCAN TOOL

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Battery, Mounting and Cables Battery Disconnect.

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G1 CHECK THE PSCM VOLTAGE SUPPLY CIRCUIT FOR AN OPEN

- Ignition OFF.
- Disconnect: PSCM C2231a.
- Ignition ON.
- Measure the voltage between the PSCM C2231a-1, circuit CBP35 (YE/GY), harness side and ground.





- Is the voltage greater than 10 volts?

Yes
GO to G2.

No
VERIFY the Smart Junction Box (SJB) fuse 35 (10A) is OK. If OK, REPAIR the circuit in question. If not OK, Refer to the Wiring Diagrams to identify the possible causes of the circuit short. CLEAR the DTCs. REPEAT the network test with the scan tool. Diagrams By Number

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G2 CHECK THE PSCM GROUND CIRCUIT FOR AN OPEN

- Ignition OFF.
- Disconnect: PSCM C2231b.
- Disconnect: Negative Battery Cable.
- Measure the resistance between the PSCM C2231b-2, circuit GD116 (BK/VT), harness side and ground.





- Is the resistance less than 5 ohms?

Yes
GO to G3.

No
REPAIR the circuit. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.

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G3 CHECK THE HS-CAN CIRCUITS BETWEEN THE PSCM AND THE DLC FOR AN OPEN

- Measure the resistance between the PSCM C2231a-2, circuit VDB04 (WH/BU), harness side and the DLC C251-6, circuit VDB04 (WH/BU), harness side.




- Measure the resistance between the PSCM C2231a-3, circuit VDB05 (WH), harness side and the DLC C251-14, circuit VDB05 (WH), harness side.





- Are the resistances less than 5 ohms?

Yes
CONNECT the negative battery cable. GO to G4.

No
REPAIR the circuit in question. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.

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G4 CHECK FOR CORRECT PSCM OPERATION

- Disconnect all the PSCM connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the PSCM connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?

Yes
INSTALL a new steering column. REFER to Steering Column Steering Column. CLEAR the DTCs. REPEAT the network test with the scan tool.

No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

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