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

Communications Network

Pinpoint Tests

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

Refer to Wiring Diagram Set 14, Module Communications Network for schematic and connector information. Diagrams By Number

Refer to Wiring Diagram Set 43, Power Steering Controls for schematic and connector information. Diagrams By Number

Normal Operation

The Power Steering Control Module (PSCM) communicates with the scan tool and other modules 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 N: 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 Service and Repair.

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N1 CHECK THE PSCM VOLTAGE SUPPLY CIRCUIT FOR AN OPEN


- Disconnect: PSCM C1463a.
- Ignition ON.
- Measure the voltage between the PSCM C1463a-1, circuit CBB45 (YE), harness side and ground.




- Is the voltage greater than 10 volts?

Yes
GO to N2.

No
VERIFY the BJB fuse 45 (5A) is OK. If OK, REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short. Diagrams By Number

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N2 CHECK THE PSCM GROUND CIRCUIT FOR AN OPEN


- Ignition OFF.
- Disconnect: Negative Battery Cable.
- Measure the resistance between the PSCM C1463b-1, circuit GD125 (BK), harness side and ground




- Are the resistances less than 5 ohms?

Yes
GO to N3.

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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N3 CHECK THE HS-CAN CIRCUITS BETWEEN THE PSCM AND THE DLC FOR AN OPEN


- Measure the resistance between the PSCM C1463a-2, circuit VDB04 (WH/BU), harness side and the Data Link Connector (DLC) C251-6, circuit VDB04 (WH/BU), harness side.




- Measure the resistance between the PSCM C1463a-3, circuit VDB05 (WH), harness side and the DLC C251-14, circuit VDB05 (WH), harness side.




- Are the resistances less than 5 ohms?

Yes
GO to N4.

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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N4 CHECK FOR CORRECT APIM OPERATION


- Disconnect all the PSCM connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the APIM 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 PSCM.

No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the network test with the scan tool.

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