Function Check Of Power Steering Control Module (PSCM)

Function check of Power Steering Control Module (PSCM).

Checking the supply voltage/ground terminal
Power Steering Control Module (PSCM) is supplied with voltage (30-feed) via a voltage input on the control module, as well as 15-feed via ignition to a voltage input on the control module.

Note! There is no cable harness to Power Steering Control Module (PSCM) for connecting the breakout box. Therefore, it is important that any measurements are performed very carefully to prevent short-circuits, damage to connectors, etc.

Power supply (30-supply)
Voltage input #B1 has +30-feed via a fuse from the battery. It will not be possible to activate the power steering function if there is an open-circuit.

Checking supply voltage (30-supply)
Check the voltage feed cable from the battery to Power Steering Control Module (PSCM) #B1 for open circuit, loose connection, contact resistance, and oxidation. Check the fuse. The voltage should be approx. the same as the battery voltage.

Note! In the event of a damaged fuse, check the circuit. Check for a short-circuit before replacing the fuse. Any damage to the cable insulation can also cause intermittent or permanent short-circuits.

Power supply from ignition switch (15-supply)
Voltage input #A1 has +15-feed via ignition and is fused in relay or fuse box engine compartment and in Central electronic module (CEM). It will not be possible to activate the power steering function if there is an open-circuit.

Checking the power supply from ignition switch (15-supply)
Check the voltage feed cable from the battery via the ignition to Power Steering Control Module (PSCM) #A1 for open circuit, loose connection, contact resistance, and oxidation. Check the fuse. The voltage should be approx. battery voltage at ignition on and Ulow at ignition off.

Ground terminal
Power Steering Control Module (PSCM) has a ground input. The ground input from the control module is power ground and is connected to the ground terminal in the car body. For more information on ground connections, see the relevant wiring diagram.

Checking ground terminal
Check the ground lead between the electrical power steering module (EPS) terminal #B2 and the ground terminal. Check for an open-circuit. Check for loose connections. Check for contact resistance. Check for oxidation.
Remedy as necessary.

Other information
- Checking wiring and terminals Checking Wiring And Terminals
- Signal specification Pinout Values and Diagnostic Parameters
- See the relevant wiring diagram for information about circuits and ground terminals in the bodywork.





Continue - Checking water or corrosion in the Power Steering Control Module (PSCM)

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Checking water or corrosion in the Power Steering Control Module (PSCM)
Water ingress to the control module and its contacts can result in reduced power steering and interference on the CAN in the vehicle.
Water ingress may also remain between the Power Steering Control Module (PSCM) and sound insulation boot, which is installed on certain vehicle versions.

Checking Power Steering Control Module (PSCM).
1. Check Power Steering Control Module (PSCM) for corrosion.
2. Check that the CAN is reset by disconnecting the control module.
3. If a fault is found, replace the Power Steering Control Module (PSCM).

Checking connectors and terminals
1. Check that the pump contact is in proper contact.
2. Check for water or moisture in the contacts.
3. If a fault is found, replace the pump for Power Steering Control Module (PSCM) and replace or repair the corroded connections.
4. Check and if necessary correct a poor battery status and poor ground connection.
If the problem persists, replace the Power Steering Control Module (PSCM).

Note! Avoid water collecting by reinstalling the sound insulation boot.


Continue - DONE

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