Circuit Description
The RTD system calibrations are stored in the EEPROM. When the ignition
switch is first turned to the ON position, the ESC module performs internal
tests on the EEPROM and can determine the integrity of the
EEPROM's non-volatile memory. The ESC module compares the
previously stored checksum with the checksum calculated
when the ignition switch is first turned ON. If the two checksums
do not match, the ESC module will indicate that a calibration
malfunction, which is a checksum error is current.
Conditions for Running the DTC
The ignition ON.
Conditions for Setting the DTC
| • | The stored checksum does not match the calculated checksum. |
| • | The ESC module detects an internal memory malfunction, which is
a checksum error. |
| • | The malfunction must be detected when the ignition switch is first
turned to the ON position. The ignition switch must be OFF first for 10 seconds. |
Action Taken When the DTC Sets
| • | Stores a DTC C0563 in the ESC memory. |
| • | Depending on which internal circuitry was affected by this malfunction,
the ESC module will command one of the following actions: |
| - | Command 0% PWM duty cycle in order to disable all four shock absorber
solenoids. |
| - | Ignore the steering position input. |
| - | Provide shock absorber solenoid control based on the vehicle speed
only. |
| - | Sends a message to the IPC to display the SERVICE RIDE CONTROL
message. |
| - | Sends a message to the IPC to display the SHOCKS INOPERATIVE message. |
| • | If the disable all four shock absorber solenoids action was taken,
the ESC module sends a message to the PCM to limit the speed. The PCM then
sends a message to the IPC to display the MAXIMUM SPEED
129 km/h (80 mph) message. |
Conditions for Clearing the DTC
| • | Under all fault conditions, the ignition must be cycled before
this DTC can change from current to history. |
| • | The ESC module no longer detects an internal memory malfunction,
which is a checksum error condition when the ignition is cycled from OFF to
ON. |
| • | A history DTC will clear after 100 consecutive ignition
cycles if the condition for the malfunction is no longer present. |
| • | Use the IPC clearing DTC feature. |
Diagnostic Aids
| • | Since DTC C0563 is an internal malfunction to the ESC module,
there is no repair procedure, and the module must be replaced. |
| • | The ESC module tests for multiple internal malfunctions, and will
store a DTC C0563 if one or more internal malfunctions are detected.
Therefore, depending on which malfunction
was detected, and what internal circuitry
was affected, this DTC may cause various symptoms. |
Test Description
The number below refer to the step number on the diagnostic
table.
-
This DTC requires
ESC module replacement.
