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Home >> Cadillac >> 2001 >> Seville STS V8-4.6L VIN 9 >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> C Code Charts >> C0584

C0584

Circuit Description
The strut actuator is controlled by the Continuously Variable Road Sensing Suspension (CVRSS) module with a Pulse-Width Modulation (PWM) signal.
Switching the voltage ON and OFF at a high frequency (2.0 kHz), or pulse width modulating, controls the amount of current delivered to the actuator. By controlling the amount of current to the actuator the CVRSS module controls the damping force in the strut.
A higher level of damping force is achieved by providing correspondingly higher current levels, relating to higher percentages of PWM duty cycle. The default damper state (no battery voltage) is one that provides a minimum damping force. The CVRSS module periodically commands each strut actuator to a preset PWM duty cycle in order to override the normal PWM command. During this preset PWM duty cycle, the CVRSS module is able to perform a diagnostic test on each strut actuator to determine if a malfunction is present. The preset PWM command can be either an OFF or ON state duty cycle.

DTC C0577, C0582, C0587,or C0592
In order to test for the conditions that set DTC C0577, C0582, C0587, or C0592, the CVRSS module must first command the strut actuator OFF. If the voltage detected in the damper control circuit during the OFF state is less than a preset value, the test is repeated. If the CVRSS module again detects voltage less than the preset value, a DTC will be set.

DTC C0578, C0583, C0588,or C 0593
In order to test for the conditions that set DTC C0578, C0583, C0588, or C0593, the CVRSS module must first command the strut actuator ON. If the voltage detected in the damper control circuit during the ON state is greater than a preset value, the test is repeated. If the CVRSS module again detects voltage greater than the preset value, a DTC will be set.

DTC C0579, C0584, C0589, or C0594
In order to test for the conditions that set DTC C0579, C0584, C0589, or C0594, the CVRSS module must first command the solenoid OFF. If the voltage detected in the damper control circuit during the OFF state is between two preset values, the test is repeated. If the CVRSS module again detects voltage between two preset values, a DTC will be set.

Conditions for Running the DTC
DTC C0577, C0579, C0582, C0584, C0587, C0589, C0592,or C0594
The following conditions must be present to run the DTC:
^ The ignition is ON.
^ The CVRSS module is in command OFF state.

DTC C0578, C0583, C0588, or C0593
The following conditions must be present to run the DTC:
^ The ignition is ON.
^ The CVRSS module is in command ON state.

Conditions for Setting the DTC
DTC C0577, C0582, C0587,or C0592
The following conditions must be present to set the DTC:
^ The CVRSS module detects voltage less than a preset value during two consecutive OFF state tests.
^ The fault is detected during three consecutive ignition cycles, or during the same ignition cycle after clearing the DTC with a scan tool.

DTC C0578, C0583, C0588, or C0593
The following conditions must be present to set the DTC:
^ The CVRSS module detects voltage greater than a preset value during two consecutive ON state tests.
^ The fault is detected during three consecutive ignition cycles, or during the same ignition cycle after clearing the DTC with a scan tool.

DTC C0579, C0584, C0589, or C0594
The following conditions must be present to set the DTC:
^ The CVRSS module detects voltage between two preset values during two consecutive OFF state tests.
^ The fault is detected during three consecutive ignition cycles, or during the same ignition cycle after clearing the DTC with a scan tool.

Action Taken When the DTC Sets
DTC C0578, C0579, C0583, C0584, C0588, C0589, C0593, or C0594
The following actions will occur when a DTC is set:
^ The SERVICE RIDE CONTROL message will be displayed. ALL the strut actuators will be disabled by commanding 0 percent PWM duty cycle.
^ The vehicle ride will be soft.

DTC C0577, C0582, C0587, or C0592
The following conditions must be present to run the DTC:
^ The SERVICE RIDE CONTROL message will be displayed.
^ ALL the strut actuators will be disabled by commanding 0 percent PWM duty cycle.
^ The damper relay control switch will be opened and the damper relay de-energized.
^ The vehicle speed will be limited.
^ The vehicle ride will be soft.

Conditions for Clearing the MIL/DTC
^ The scan tool can be used to clear the DTC.
^ The DTC is saved as history when the CVRSS module no longer detects the fault during two consecutive diagnostic tests. The DTC will clear if the fault does not return after 50 consecutive ignition cycles.

Diagnostic Aids
^ If multiple strut actuator circuit DTCs are stored along with DTC C0690, diagnose DTC C0690 first.
^ If the DTC is a history DTC, the fault may be intermittent. Refer to Testing for Intermittent and Poor Connections in Diagrams/Diagnostic Aids.

Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
3. Tests for voltage at the coil side of the solenoid.
4. Verifies that the CVRSS module is providing ground to the solenoid.
5. Tests if ground is constantly being applied to the solenoid.





DTC C0577, C0578, C0579, C0582, C0583, C0584, C0587, C0588 C0589, C0592, C0593, or C0594

DTC C0615, C0620, C0625 or C0630
Circuit Description
The Continuously Variable Road Sensing Suspension (CVRSS) module supplies a 5.0 volt reference signal to the suspension position sensor.
The suspension position sensor supplies an analog voltage (0.35 - 4.75 volts) back to the CVRSS module which represents the position between the body and the wheel. The sensor is also grounded through the CVRSS module.

Conditions for Running the DTC
The ignition is ON.

Conditions for Setting the DTC
^ The DTC is set when the CVRSS module measures the position sensor signal voltage below 0.35 volts or above 4.75 volts for more than 1.0 second.
^ The fault is detected during three consecutive ignition cycles, or during the same ignition cycle after clearing the DTC with a scan tool.

Action Taken When the DTC Sets
^ The CVRSS module will enter the Speed Dependent damping mode.
^ Both Left and Right Normal Force outputs will be set to the default output states.
^ The SERVICE RIDE CONTROL message will be displayed.

Conditions for Clearing the MIL/DTC
^ The scan tool can be used to clear the DTC.
^ The DTC is saved as history when the CVRSS module no longer sees voltage outside the
normal range. The DTC will clear if the fault does not return during 50 consecutive ignition cycles.

Diagnostic Aids
^ If this fault condition is set along with DTC C0696, diagnose DTC C0696 first.
^ If the DTC is a history DTC, the fault may be intermittent. Refer to Testing for Intermittent and Poor Connections in Diagrams/Diagnostic Aids.

Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
3. Tests for the proper operation of the circuit in the low voltage range.
4. Tests for the proper operation of the circuit in the high voltage range. If the fuse in the jumper opens when you perform this test, the signal circuit is shorted to ground.
5. Tests for a short to voltage in the 5 volt reference circuit.
6. Tests for a high resistance or an open in the ground circuit.
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