Toyota 84540-20220 Switch Assy, Neutral Start

To remove the switch, unbolt the negative terminal of the battery and also engage the transaxle into Neutral. Subtract the nut and take off the shift lever and disconnect the electrical connector. Next, undo the attaching bolts with the help of a wrench and slightly lift the switch off the shift shaft. To install, the flats of the shift shaft must be slid into the corresponding notches in the switch and then push the switch onto the shaft. Place the bolts in a loosely manner and then go ahead with the adjustment. There are two methods to adjust the Neutral start switch: One of them, for example, requires the disconnection of the electrical connector, the loosening of the mounting bolts on the switch, and the measurement of the switch's continuity with an ohmmeter after rotating the switch; when correct continuity is obtained between the terminals, this means the switch is in the Neutral position, and the mounting bolts should be tightened securely. The second one applies the use of a switch which should be rotated until the neutral basic line on the switch housing matches the groove of the shift shaft and then the bolts are tightened.

The Park/Neutral switch is incorporated in the transmission position switch, along with the backup light switch while at the same time sending transmission gear position information to the PCM. This function does not allow the engine to start while the shifter lever is in any position other than the Park or the Neutral and should the engine engage while the shifter lever is in any other position, the switch must require adjustment. Further, switch B is an information sensor for the Electronic Controlled Transaxle ECU and the voltage is outputted when positioning the shift lever. For the switch replacement, turn the vehicle upward using jackstands, then you will have to disconnect the electrical connector of the switch, also you will need to remove the lock plate and the nut for the manual lever, in case the lock plate has tabs you need to flatten them. Then, the switch retaining bolts have to be pulled out, and then the manual lever must be disconnected, as well as the switch itself. Installation is done in the reverse order to removal but with a required adjustment of the switch. For adjustment they have to remove the switch retaining bolts and turn the switch counterclockwise until one of them fits into the groove of the shaft, the switch has to be held with hands and switch retaining bolts to be tightened, there is a pointer on the sheetmetal lock plate to confirm the position of the neutral basic line of the switch.