DTC C078A
Diagnostic Instructions
DTC Descriptors
DTC C078A 39: Tire Pressure Indicator Module Internal Malfunction
Circuit/System Description
The internal fault detection is handled inside the tyre pressure indicator module. No external circuit diagnosis is involved.
Conditions for Running the DTC
The control 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 control module has detected an internal malfunction.
Action Taken When the DTC Sets
The control 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 control 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 control module. |
| • | If stored only as a history DTC and not retrieved as a current DTC, do not replace the control module. |
| • | If this DTC is retrieved as both a current and history DTC, replace the tire pressure indicator module. |
Circuit/System Verification
Verify that DTC C078A is not set.
| ⇒ | If the DTC is set, replace the K65 tire pressure indicator module. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
Control Module References for control module replacement, setup, and programming
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