What happens when the transmission shaft speed sensor does not work?
What happens when the transmission shaft speed sensor does not work?
Thus, if the PCM does not receive an input signal from the transmission output shaft speed sensor, it is effectively deprived of the primary information it needs to control the transmission. When this happens the PCM will set code P0722, and may also illuminate a warning light.
What happens if the gear ratio does not match?
The actual gear ratio is then compared to the desired gear ratio. If the desired gear and the actual gear do not match, then the PCM will set a diagnostic trouble code (DTC) and illuminate the Check Engine Light or Malfunction Indicator Lamp (MIL).
What causes transmission to slip in fourth gear?
If the transmission slips in fourth gear but not in third gear, the overdrive clutch is slipping. By selecting another gear which does not use these clutches, the slipping unit can be determined.
When is the overdrive clutch applied in fourth gear?
The overdrive clutch is applied only in fourth gear. However the overdrive direct clutch and overrunning clutch are applied in all ranges except fourth gear. If slippage occurs in first gear in D and 2 range but not in 1 range, the transmission overrunning clutch is faulty.
Can a VSS sensor be used for driveshaft speed?
Driveshaft Speed – This VSS sensor can also provide a Driveshaft Speed input by splitting the signal wire to a 2nd Digital Speed Input (RPM). Example #1: Divide 16 sensor pulses per revolution, by 2.54 speedometer gear ratio, and enter 6.30 PPROT (16 ÷ 2.54 = 6.30 PPROT).
What is gear ratio for Holley VSS sensor?
The rear axle gear ratio is 3.31, which becomes a final EFI “Gear Ratio” of 1.26 (3.31 ÷ 2.63 = 1.26 “Gear Ratio” in EFI software). Driveshaft Speed – This VSS sensor can also provide a Driveshaft Speed input by splitting the signal wire to a 2nd Digital Speed Input (RPM).
Can a VSS be used on a Mustang?
The Auto Meter 5292 VSS requires a modification for use with a Fox Mustang speedometer cable end. Do not modify the speedometer cable. The brass tube inside diameter must be drilled out to 17/32″. Then measure the depth of the retaining rib on the speedometer cable’s metal end cap.
How does the VSS work on the ECU?
• Some of the VSS parameters are “math operations” that occur on hardware vs the base firmware in the ECU. They are performed when you key-on only. Meaning when you change it (click “Save”), it won’t recognize the change until you do a key-on event.
