This procedure addresses the removal and replacement of an electric power steering module on a 1966 Chevrolet Corvette 327ci V8, though this vehicle was originally equipped with manual steering and this represents a modern aftermarket conversion.

Warnings

Tools required

Parts

• Electric power steering control module × 1 — Use manufacturer-specific module for installed EPS system
• Electrical connector seals × 2 — Match EPS system connector type
• Module mounting hardware × 1 — Use OEM specification

Preparation

1. Park vehicle on level surface and engage parking brake
2. Disconnect battery negative terminal and wait at least 5 minutes
3. Document all electrical connections with photos before disconnection
4. Locate the EPS control module - typically mounted on firewall, under dash, or near steering column depending on aftermarket kit manufacturer
5. Verify which EPS system brand is installed (Ididit, Borgeson, Flaming River, etc.) to reference manufacturer-specific procedures

Procedure

1. 1

   Access the EPS control module
   Remove any trim panels or covers blocking access to the EPS module. For firewall-mounted units, this typically requires removing the lower dash panel on driver side. Remove the mounting screws securing any protective cover over the module itself.
2. 2

   Disconnect main power supply
   Locate the main power supply connector to the EPS module. This is typically a heavy-gauge wire pair (red positive and black ground) connected via ring terminals or a multi-pin connector. Note wire colors and routing. Disconnect the power supply by removing the connector or unfastening the ring terminal fasteners.
3. 3

   Disconnect steering sensor inputs
   Locate and disconnect the torque sensor connector coming from the steering column. This is typically a 4 to 6 pin connector. Release any locking tabs and carefully pull the connector straight out. If connector shows corrosion, spray with electrical contact cleaner.
4. 4

   Disconnect motor control outputs
   Disconnect the motor control connector that runs to the electric steering motor on the column or rack. This is typically a sealed multi-pin connector with 3 to 5 pins. Note the orientation and any keying features before removal.
5. 5

   Disconnect vehicle speed signal input
   Locate and disconnect the vehicle speed sensor input wire. On 1966 Corvette conversions, this typically taps into the speedometer cable sensor or uses a GPS-based speed sensor. Disconnect the connector and note routing.
6. 6

   Disconnect ignition power feed
   Disconnect the switched ignition power feed that provides power only when the key is in the run position. This prevents the EPS from drawing power when the vehicle is off. Note wire color and source connection point.
7. 7

   Remove module mounting fasteners
   Remove the mounting bolts or screws securing the EPS module to its bracket. Mounting point count and bolt size vary by kit manufacturer, so note the exact fasteners used on the installed system before removal. Support the module as you remove the final fastener to prevent it from falling.
8. 8

   Remove the EPS control module
   Carefully remove the module from its mounting location, ensuring no wiring harness is still attached. Check for any adhesive-backed wiring that may be stuck to the module housing. Place the old module on a clean, static-free surface if it will be returned as a core.
9. 9

   Inspect connectors and wiring
   Inspect all electrical connectors for corrosion, bent pins, or damage. Clean connectors with electrical contact cleaner if necessary. Inspect wiring for chafing, heat damage, or loose connections. Repair or replace any damaged wiring before installing new module.
10. 10

    Install new EPS control module
    Position the new EPS module in the mounting location. Align mounting holes and hand-thread all mounting fasteners before tightening any of them. Tighten mounting fasteners in a cross pattern to ensure even clamping pressure. Ensure the module is securely mounted with no movement.
11. 11

    Reconnect all electrical connections
    Reconnect all electrical connections in reverse order of removal: ignition power feed, vehicle speed signal, motor control outputs, steering sensor inputs, and main power supply. Ensure each connector clicks or seats fully and any locking tabs engage properly. Verify no pins are bent or pushed back in connectors.
12. 12

    Secure wiring harness
    Secure all wiring with zip ties or wire looms to prevent chafing against sharp edges or hot components. Ensure wiring has adequate slack for steering movement and does not interfere with pedals, steering column travel, or any moving components.
13. 13

    Perform electrical verification
    Before reconnecting battery, use a multimeter to check for any short circuits between power feeds and ground. Verify resistance readings match the specific EPS manufacturer's documented specifications; do not rely on a generic value, as acceptable resistance varies significantly between Borgeson, Flaming River, EZ Electric and other systems.
14. 14

    Reconnect battery and initialize system
    Reconnect the battery negative terminal. Turn the ignition to the run position without starting the engine. Most EPS systems will perform a self-test indicated by a brief motor movement or dash warning light sequence. Consult the specific EPS manufacturer's instructions for initialization procedure - some systems require turning the steering wheel lock-to-lock 3 times or cycling ignition on/off.

Reassembly

1. Reinstall all trim panels and covers removed for access
2. Verify all electrical connections are secure and properly routed
3. Ensure no tools or parts are left in the work area

Verification

• Start the engine and verify no warning lights related to power steering remain illuminated
• With engine running, turn steering wheel slowly from lock to lock and verify smooth assist with no binding, noise, or jerking
• Verify steering returns to center properly when released
• Test drive vehicle at low speed in a safe area to confirm proper steering assist operation
• Verify steering effort increases appropriately with vehicle speed if speed-sensitive assist is equipped
• Check for any error codes using manufacturer-specific diagnostic tool if available
• Inspect all connections after test drive for any signs of looseness or overheating

More procedures for this vehicle