Mazda Trucks 1994-1998 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.  

To install:
  1. Fit a new O-ring to the switch. Install the switch.
  2.  
  3. Reconnect the harness connector to the switch.
  4.  
  5. Lower the vehicle.
  6.  
  7. Reconnect the negative battery cable.
  8.  
  9. 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.  

4R44E, 4R55E and 5R55E Transmissions

See Figures 2, 3 and 4

Starting in 1995, the switch was used not only for neutral start sensing and back-up light activation, but also as a gear position range sensor. The Powertrain Control Module reads the sensor to determine which gear position the transmission is in, and adjusts fuel and spark timing accordingly. The new switch is called the Transmission Range (TR) sensor.

To install the Transmission Range (TR) sensor requires a special Transmission Range Sensor Alignment Tool T97L-70010-AH, or equivalent.

  1. Disconnect the negative battery cable, block the rear wheels and apply the parking brake.
  2.  
  3. Place the transmission shift lever in the Neutral (N) position.
  4.  
  5. Raise and safely support the front of the vehicle
  6.  
  7. Disconnect the shift control cable from the transmission manual control lever.
  8.  
  9. Disconnect the electrical wire harness plug from the TR sensor.
  10.  



Click image to see an enlarged view

Fig. Fig. 2: Remove the two Transmission Range (TR) sensor retaining bolts

  1. Remove the manual control lever retaining nut as well as the lever.
  2.  
  3. Remove the two retaining bolts and the sensor.
  4.  

To install:
  1. Ensure that the transmission shift lever is in the Neutral (N) position.
  2.  
  3. Install the TR sensor and loosely install the retaining bolts.
  4.  



Click image to see an enlarged view

Fig. Fig. 3: Align the new sensor with the Digital TR Sensor Alignment Tool

  1. Align TR sensor slots using the Transmission Range Sensor Alignment Tool T97L-70010-AH, or equivalent.
  2.  
  3. Tighten the retaining bolts to 7-9 ft. lbs. (9-12 Nm).
  4.  



Click image to see an enlarged view

Fig. Fig. 4: Install the manual control lever to the sensor and tighten the retaining bolt

  1. Install the manual control lever to the sensor and tighten the retaining nut to 22-26 ft. lbs. (30-35 Nm).
  2.  
  3. Connect the TR sensor electrical wire harness plug.
  4.  
  5. Install the shift control cable to the transmission manual control lever.
  6.  
  7. Lower the vehicle and connect the negative battery cable.
  8.  
  9. Ensure that the wheels are still blocked and the parking brake is applied.
  10.  
  11. Check for proper operation of the switch. The engine should only start in Park (P) or Neutral (N).
  12.  

RA4A-EL and RA4AX-EL (Electronically Controlled) Transmissions

  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 (Hydraulically Controlled) Transmission
  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.  

ADJUSTMENT



A4LD Transmission

No adjustment is necessary or possible on the A4LD transmission Park Neutral Position (PNP) switch.

4R44E, 4R55E and 5R55E Transmissions

See Figures 5 and 6

To adjust the Transmission Range (TR) sensor requires a special Transmission Range Sensor Alignment Tool T97L-70010-AH, or equivalent.

  1. Raise and safely support the vehicle.
  2.  
  3. Block the rear wheels and apply the parking brake.
  4.  
  5. Place the transmission shift control lever in the Neutral (N) position.
  6.  
  7. Remove the nut securing the transmission control manual lever to the TR sensor.
  8.  
  9. Loosen the two TR sensor retaining bolts.
  10.  
  11. Align the TR sensor slots using the Transmission Range Sensor Alignment Tool T97L-70010-AH, or equivalent.
  12.  
  13. Tighten the TR sensor retaining bolts to 7-9 ft. lbs. (9-12 Nm).
  14.  
  15. Install the nut retaining the transmission manual control lever to the TR sensor. Tighten to 12-16 ft. lbs. (16-22 Nm).
  16.  
  17. Lower the vehicle. Leave the wheels blocked and the parking brake applied.
  18.  
  19. Check the TR sensor operation. The engine should only start in Park (P) or Neutral (N).
  20.  

RA4A-EL and RA4AX-EL (Electronically Controlled) Transmissions

See Figure 5

  1. Install the park/neutral switch over the manual shaft.
  2.  
  3. 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).
  4.  



Click image to see an enlarged view

Fig. Fig. 5: Adjusting the park/neutral switch-RA4A-EL/RA4AX-EL transmissions

  1. Insert a 0.157 inch (4.0mm) pin through the holes of the switch and the manual shaft lever.
  2.  
  3. Tighten the switch mounting bolts to 22-35 inch lbs. (2.5-3.9 Nm). Remove the pin.
  4.  
  5. Connect the electrical connector.
  6.  
  7. Reinstall the shift control linkage.
  8.  
  9. Connect the negative battery cable, and check for proper operation.
  10.  

NA4A-HL (Hydraulically Controlled) Transmission

See Figure 6

  1. Position the park/neutral switch over the manual shaft lever and install the mounting bolts.
  2.  
  3. Move the manual shaft lever to the N position.
  4.  



Click image to see an enlarged view

Fig. Fig. 6: Adjusting the park/neutral switch-NA4A-HL transmission

  1. 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.
  2.  
  3. Tighten the switch mounting bolts to 43-61 inch lbs. (4.9-6.9 Nm).
  4.  
  5. Install the screw in the park/neutral switch body and reconnect the wiring harness connector.
  6.  
  7. Reinstall the control linkage.
  8.  
  9. Safely lower the vehicle, reconnect the negative battery cable, and check for proper operation.
  10.  

 
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