DTC Jeep C1408-86 Short Explanation
The video focuses on the basic Jeep specific diagnostic error code.
Contents:
0:21 Basic DTC analysis according to OBD2 protocol standard.
1:48 Insight into programming
an explanation of what a bit is and how a byte is formed
decoding the Error Code to the base programming
2:58 A diagnostically understandable description of the Diagnostic Trouble Code
3:05 Basic error definition
Possible causes or errors of the car and its parts describing the mentioned error
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Make:
Jeep
Code:
C1408 86
Definition:
Torque Converter Clutch Pressure Control Solenoid Control Circuit-Open
Description:
The purpose of the diagnostic is to detect circuit failures on the solenoid driver circuits. The 948TE Transmission Control Module (TCM) solenoid driver circuits are low side drivers. This means that the solenoids are supplied power through a fused B+ circuit in the TCM and the ground side is Pulse Width Modulated (PWM) by the TCM to control solenoid operation. By modifying the PWM signal the solenoids can operate as either on off hydraulic valves or as variable pressure control valves. This valve body uses both depending on individual solenoid function in the hydraulic system.
Cause:
SOLENOID SUPPLY 1 CIRCUIT OPENSOLENOID SUPPLY 1 CIRCUIT SHORTED TO GROUNDTORQUE CONVERTER PRESSURE CONTROL SOLENOID CIRCUIT OPENTORQUE CONVERTER PRESSURE CONTROL SOLENOID CIRCUIT SHORTED TO GROUNDTORQUE CONVERTER PRESSURE CONTROL SOLENOID CIRCUIT SHORTED TO VOLTAGETORQUE CONVERTER PRESSURE CONTROL SOLENOIDTRANSMISSION CONTROL MODULE (TCM)
Failure Type:
Signal Invalid
This sub type is used for failures where some circuit quantity, reported via serial data, is not plausible given the operating conditions.