Fault diagnosis
- Make
- Fiat
- Model
- Punto (176) Factory Service Manual
- Year
- 1993–1999
- Section
- Automatic transmission (Selecta) › Fault diagnosis
21 Gearbox and differentialFault diagnosis
FAULT DIAGNOSIS
| Fault | Causes and corrective action |
|---|---|
| The parking lock does not function with the vehicle parked on an incline | 1) Check that the selector lever position agrees with the position selected at the transmission 2) If fault persists then replace the transmission |
| Oil leaks | 1) The main locations to check and adjust are: - Oil sump - Oil drain plug - Kick-down cable sealing ring - Oil cooler and associated tubing - Oil seal rings, right and left halfshafts - Sealing ring, secondary pressure take-off point - Oil seal ring, input shaft to transmission 2) If the oil leak(s) are in different points to those stated and are impossible to fix, then replace the transmission |
| It is possible to start the engine in all the selector lever positions | 1) Check the multifunction switch adjustment 2) Check the electrical connections 3) Check the transmission selector cable adjustment |
| The vehicle moves forward or backwards when starting the engine with "N" or "P" selected | 1) Check and adjust the transmission selector cable 2) If the fault persists then replace the transmission |
| It is not possible to start the engine with "P" or "N" selected | 1) Check the adjustment of the transmission selector cable 2) Check the electrical connections 3) Check the multifunction switch |
| Selector mechanism does not operate correctly | 1) Check and adjust the transmission selector cable 2) Check the condition of the power supply brushes for the electromagnetic clutch and the associated connections 3) Check the adjustment of the two accelerator pedal microswitches 4) If the fault persists then replace the transmission and clutch |
| Drive modes ("D", "L", "R") do not function when accelerator pedal is pressed | 1) Check the oil level in the transmission 2) Check and adjust the selector lever 3) Use the Fiat-Lancia Tester to check the clutch closure 4) Check the transmission mode with the multifunction switch 5) Check the adjustment of the two accelerator pedal microswitches 6) Check the state of the power supply brushes for the electromagnetic clutch and the associated connections 7) Check the transmission oil pressure 8) If the fault persists then replace the electronic control unit 9) If the fault persists then substitute the transmission and the clutch |
Parts & tools for this job For 1993 Fiat Punto
- PARTTransmission filter kitSearch: Fiat Punto 1993 transmission filter kit
- FLUIDAutomatic transmission fluidSearch: Fiat automatic transmission fluid
- TOOLFluid transfer pumpSearch: fluid transfer pump
Links open Amazon search results in a new tab. As an Amazon Associate I earn from qualifying purchases.