Circuit Description
The speed sensitive power steering (SSPS) control module uses the steering wheel position sensor to determine the angle speed of the steering wheel. If the angle speed were big enough for intervention into normal steering force control during high vehicle speed, which means a driver made an evasive steering maneuver to avoid an accident, SSPS module would supply enough steering support. The steering wheel position sensor is a potentiometer type sensor with the following 3 circuits:
| • | A 5-volt reference |
| • | A low reference |
| • | A signal |
Conditions for Running the DTC
The ignition is ON.
Conditions for Setting the DTC
| • | A short to voltage on the steering wheel position sensor signal circuit |
| • | A short to battery voltage on the steering wheel 5-volt reference circuit |
| • | Open circuit on the steering wheel position sensor reference low signal |
| • | A defective steering wheel position sensor |
Action Taken When the DTC Sets
| • | The SSPS warning light will illuminate. |
| • | Power steering assist will default to full power steering effort. |
| • | The SSPS will store a DTC 07 in memory. |
Conditions for Clearing the DTC
| • | Conditions for the fault are no longer present. |
| • | Use the scan tool in order to clear the DTC and cycle the ignition in order to clear the warning lamp. |
Diagnostic Aids
Check for the following conditions if a history or intermittent DTC is indicated.
| • | A poor connection at the SSPS control module. Inspect the harness connectors for backed out terminals, improper mating, improperly formed or damaged terminals, and poor terminal to wire connections. |
| • | A damaged wiring harness. Inspect the wiring harness for damages. If the wiring harness appears to be in good condition, observe the display on the DMM while moving the connectors and wiring harnesses related to the actuator. A change in the DMM display during the test will indicate the location of the fault. |
| • | For additional information, refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
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This test checks for a short to voltage in the steering wheel position sensor circuits.
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This test checks for a short to battery voltage on the 5-volt reference circuit
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This test checks for a short to voltage on the steering wheel position sensor signal circuit.
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This test checks for an open circuit in the reference low circuit.
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This test checks for a poor connection at the SSPS control module.
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This test checks for a poor connection at the steering wheel position sensor.
Step | Action | Values | Yes | No |
|---|---|---|---|---|
Schematic Reference: Steering Assist Schematics Connector End View Reference: Steering Assist Connector End Views | ||||
1 | Did you perform the Variable Effort Steering Diagnostic System Check? | -- | Go to Step 2 | |
2 |
Is the measured resistance within the specified value? | 4.8-5.2 V | Go to Step 3 | Go to Step 4 |
Did you find and correct the condition? | -- | Go to Step 7 | Go to Step 5 | |
4 | Test for a short to battery voltage in the steering wheel position sensor 5-volt reference circuit. Refer to Testing for Short to Ground and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 5 |
Test for a short to battery voltage in the steering wheel position sensor signal circuit. Refer to Testing for Short to Ground and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 6 | |
Test for an open in the steering wheel position sensor low reference circuit. Refer to Testing for Continuity and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 8 | |
Test for a poor connection at the speed sensitive power steering (SSPS) control module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 9 | |
Test for a poor connection at the steering wheel position sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 10 | |
Replace the power steering control module. Refer to Power Steering Control Module Replacement . Is the repair complete? | -- | Go to Step 11 | -- | |
10 | Replace the steering wheel position sensor. Refer to Steering Wheel Position Sensor or Steering Shaft Lower Bearing Replacement in Steering Wheel and Column. Is the repair complete? | -- | Go to Step 11 | -- |
11 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 2 |
