DTC C0550
Diagnostic Instructions
DTC Descriptors
DTC C0550 00: Electronic Control
Unit |
DTC C0550 35: Electronic Control Unit ROM
Malfunction |
DTC C0550 39: Electronic Control Unit
Internal Malfunction |
DTC C0550 43: Electronic Control Unit
EEPROM Incorrect Programming |
Circuit/System Description
The internal fault detection is handled inside the control
module. The symptom byte listed in the DTC Descriptor is for
engineering reference only. No external circuit diagnosis is
involved.
Conditions for Running the DTC
The module runs the program to detect an internal fault when
power up is commanded. The only requirements are voltage and
ground. This program runs even if the voltage is out of the valid
operating range.
Conditions for Setting the DTC
The module has detected an internal malfunction.
Action Taken When the DTC Sets
The module refuses all additional inputs.
Conditions for Clearing the DTC
• |
A current DTC clears when the
malfunction is no longer present. |
• |
A history DTC clears when the
module ignition cycle counter reaches the reset threshold of 50,
without a repeat of the malfunction. |
Diagnostic Aids
• |
This DTC may be stored as a
history DTC without affecting the operation of the module.
|
• |
If stored only as a history
DTC and not retrieved as a current DTC, do not replace the
module. |
• |
If this DTC is retrieved as
both a current and history DTC, replace the module that set the
DTC. |
Circuit/System Verification
1. |
Verify that DTC B1325, B1330,
B1370, B1380, B1424, B1440, B1441, B1517, C0800, C0899, C12E1,
P0560, or P0562 is not set. |
2. |
Verify that DTC C0550 is not
set. |
⇒ |
If the DTC is set with symptom byte 39 or 43,
program the control module that set the DTC. If the DTC resets,
replace the control module that set the DTC. |
⇒ |
If the DTC is set with other symptom bytes,
replace the control module that set the DTC. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the repair.
Control Module References for module replacement, setup, and
programming
|