Mazda Trucks 1987-1993 Repair Guide

Neutral Start Switch/Back-up Switch

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REMOVAL & INSTALLATION



A4LD Transmission

See Figure 1

The Park/Neutral Position (PNP) switch, mounted on the transmission, allows the vehicle to start only in P or N . The switch has a dual purpose, in that it is also the back-up lamp switch.



Click image to see an enlarged view

Fig. Fig. 1: View of the Park/Neutral Position (PNP) switch used on the A4LD transmission

  1. Disconnect the negative battery cable.
  2.  
  3. Raise and support the vehicle safely.
  4.  
  5. Disconnect the harness connector from the neutral start switch.
  6.  
  7. Clean the area around the switch. Remove the switch and O-ring, using a thin wall socket (tool T74P-77247-A or equivalent).
  8.  
  9. Installation is the reverse of removal. Check the operation of the switch, with the parking brake engaged. The engine should only start in N or P . The back-up lamps should come ON only in R .
  10.  

RA4A-EL and RA4AX-EL Transmissions

See Figure 2



Click image to see an enlarged view

Fig. Fig. 2: View of the Park/Neutral Position (PNP) switch

  1. Disconnect the negative battery cable.
  2.  
  3. Raise and safely support the vehicle.
  4.  
  5. Disconnect the control linkage from the transmission manual shaft.
  6.  
  7. Disconnect the park/neutral switch harness connector, remove the switch mounting bolts, and remove the park/neutral switch.
  8.  

To install:
  1. Install the park/neutral switch over the manual shaft.
  2.  
  3. Install the switch mounting bolts but do not tighten.
  4.  
  5. Make sure the transmission manual shaft lever is positioned at the L position (fully forward). Turn the manual shaft lever fully rearward, then return it 2 notches ( N position).
  6.  
  7. Insert a 0.157 inch (4.0mm) pin through the holes of the switch and the manual shaft lever.
  8.  
  9. Tighten the switch mounting bolts to 22-35 inch lbs. (2.5-3.9 Nm). Remove the pin.
  10.  
  11. Connect the electrical connector.
  12.  
  13. Reinstall the shift control linkage.
  14.  
  15. Safely lower the vehicle, connect the negative battery cable, and check for proper operation.
  16.  

NA4A-HL Transmission

See Figure 2

  1. Disconnect the negative battery cable.
  2.  
  3. Raise and safely support the vehicle.
  4.  
  5. Disconnect the control linkage from the transmission manual shaft.
  6.  
  7. Disconnect the wiring harness connector and remove the park/neutral switch mounting bolts. Remove the switch from the manual shaft lever.
  8.  

To install:
  1. Position the park/neutral switch over the manual shaft lever and install the mounting bolts. Do not fully tighten the mounting bolts.
  2.  
  3. Move the manual shaft lever to the N position.
  4.  
  5. Remove the screw on the switch body and move the switch so the screw hole is aligned with the small hole inside the switch. Check their alignment by inserting a 0.079 in. (2.0mm) diameter pin through the holes.
  6.  
  7. Tighten the switch mounting bolts to 43-61 inch lbs. (4.9-6.9 Nm).
  8.  
  9. Install the screw in the park/neutral switch body and reconnect the wiring harness connector.
  10.  
  11. Reinstall the control linkage.
  12.  
  13. Safely lower the vehicle, connect the negative battery cable, and check for proper operation.
  14.  

ADJUSTMENTS



Refer to the removal and installation procedures for adjustment.

 
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