Gear Selector Lever Assembly (Automatic gearbox - Jatco) (page 3 of 3)

The sport/manual switch comprises a PCB and connector socket which is located to the left of the selector lever and is an integral part of the selector lever assembly and cannot be serviced separately. The switch is connected to the main harness by a twelve pin connector.

The sport/manual switch has five proximity sensors which correspond to the D, N, 4 and +/- positions. The selector lever has two targets. An upper target is aligned with the DN4 sensors and the lower target is aligned with the +/- sensors.

When the selector lever is in the D position, the D sensor is aligned with the target and the EAT ECU receives a signal that D is selected. When the selector lever is moved to the S/M (sport) position, the target moves away from the sensor. This is sensed by the ECU which then initiates sport mode.

The sensors in the N and 4 positions inform the ECU that D has been deselected, but not to the S/M position, preventing the ECU from incorrectly initiating sport mode.

When the selector lever is moved to the S/M position, the target moves away from the D sensor. If the EAT ECU does not receive a signal from either the 4 or N sensors, it determines that sport has been selected. The lower target is positioned between the two sensors for +/- selection. If the selector lever is not moved to the +/- positions, the ECU keeps the gearbox in sport mode. If the ECU senses a signal from either the + or - sensor, it initiates manual mode and selects the manual gear selection requested. Manual mode will be maintained until the ECU senses a signal from the D sensor.

Shift Interlock Solenoid The shift interlock solenoid is controlled by the EAT ECU. When the ignition switch is in position II, with the selector lever in the Park position, the EAT ECU supplies a power feed to the shift interlock solenoid. The shift interlock solenoid energises and extends a pin into the selector lever, locking the lever in Park.

While the selector lever is in Park, when the EAT ECU senses the brake pedal being pressed, it de-energises the shift interlock solenoid and the solenoid pin retracts, allowing the selector lever to be moved. When the selector lever is in any position other than Park, the shift interlock solenoid remains de-energised after the brake pedal is released, and the lever is free to be moved through the remainder of the range.

LED Module The LED module is located in the selector lever surround and is secured with two integral clips. The module is connected to the main harness by a 12 pin connector (C0675).

The LED module illuminates the applicable LED for the P, R, N, D, 4, 2, 1 and S/M positions. When the side lamps are switched on, all the LED's are illuminated at a low intensity, with the selected gear lever position LED illuminated at a higher intensity.

Selector Cable The selector cable is a Bowden type cable that connects the selector lever to an input lever on the gearbox.

A 'C' clip secures the outer cable to the selector lever assembly; the gearbox end of the outer cable is secured to a bracket on the gearbox by an integral clip. The inner cable is adjustable at the connection with the gearbox input lever.

Brake Switch The brake switch is located on the pedal box below the fascia. The EAT ECU uses this switch to monitor brake pedal application status. The information is input to pin 43 of the EAT ECU on a hardwired connection from the switch.

The EAT ECU can allow the gearbox to apply more engine braking therefore slowing down the vehicle in a shorter distance and reducing brake pad wear. The EAT ECU achieves engine braking by applying the low and reverse clutches.

The brake switch can fail in the following ways: l Switch open circuit l Short circuit to 12 or 5 volts l Short circuit to earth.

In the event of a brake switch signal failure, extra gearbox braking will not occur and the shift lock solenoid (if fitted) will not function.