DTC Lincoln U0121-87 Short Explanation
Channel: Maxidot Lincoln
Date: 2020-07-24

The video focuses on the basic Lincoln 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:
Lincoln
Code:
U0121 87
Definition:
Idle Speed High
Description:
DTCs P0068, P0101, P0102, P0103, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P0171, P0172, P0174, P0175, P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0220, P0221, P0222, P0223, P0300-P0308, P0351-P0358, P0461- P0463, P0496, P0502, P0503, P0606, P0722, P0723, P0806-P0808, P1516, P2066-P2068, P2101, P2135, P2227-P2230 are not set.The engine is operating for at least 60 s.The engine is idling for greater than 10 s.The barometric pressure (BARO) is greater than 70 kPa (11 psi).The engine coolant temperature (ECT) is greater than 60°C (140°F).The intake air temperature (IAT) is warmer than -20°C (-4°F).The vehicle speed is less than 3 km or h (2 mph).The commanded engine speed is steady within 25 RPM.The transmission is not changing gears.The torque converter clutch (TCC) is not changing states.The manual transmission clutch pedal position is between 20-88 percent - If equipped.The manual transmission clutch is not depressed - If equipped.The power take-off (PTO) is not active - If equipped.The transfer case is not in 4WD Low - If equipped.A scan tool output control is not active.The system voltage is between11-18 V.DTC P0506 and P0507 run continuously when the above conditions are met for greater than 10 s.
Cause:
The actual idle speed is approximately 180 RPM greater than the desired idle speed.
Failure Type:
Missing Message
This sub type is used for failures where one (or more) expected message(s) is not received, e.g., periodic transmission where the repetition time is too high, or message not received as a result of unforeseen reset events of the concerning component (e.g. engine control unit communicating with ABS).