LEMON Manuals: Even more car manuals for everyone
Home >> Chrysler >> 2011 >> 300 C, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 234 (DTCS P1D94 To U1479 - 8HP45 Automatic Transmission - 1500) >> Diagnosis And Testing >> P1DB4-Incorrect Gear Ratio During Gear Engagement Or In Gear >> Set Condition

Set Condition

WARNING: This page is about a different car, the 2013 RAM 1500. However, it is still accessible from the selected car via links, so may be relevant.

If the output speed is greater than a calibrated threshold, a failure is detected when the measured gear ratio exceeds the specific gear ratio range which is depending on the ratio at the beginning of the gear engagement for a calibrated amount of time. If the output speed is lower than this calibrated threshold, a failure is detected if the input speed difference (difference between the actual input speed and the input speed at the beginning of the monitoring) exceeds a calibrated threshold for a period of time. If a failure is detected during gear engagement, the Transmission Control Module (TCM) aborts the gear engagement and changes to a neutral position. After a calibrated number of failures a DTC is stored and on the next request for gear engagement, the TCM will command a default gear.