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How do i know when my neutral safety switch is going bad?

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U wont be able to start motor in neutral

Posted on Nov 02, 2012

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  • 2 Answers

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Posted on Jan 02, 2017

emissionwiz
  • 75051 Answers

SOURCE: Neutral Safety Switch Location

on the transmission where the shift cable attaches.

Posted on Jun 15, 2009

ZJLimited
  • 17970 Answers

SOURCE: Looking for the neutral safety switch

Neutral Safety/Back-up Light Switch

This is a combination switch which controls both Neutral Safety and Back-up lamp circuits.

C6 Transmission


8290dff.jpg

C6 neutral start switch

  1. Disconnect the negative battery cable.
  2. Raise and safely support the vehicle on jackstands.
  3. Remove the downshift linkage rod return spring at the low-reverse servo cover.
  4. Coat the outer lever attaching nut with penetrating oil. Remove the nut and lever.
  5. Remove the 2 switch attaching bolts, disconnect the wiring at the connectors and remove the switch.
  6. Installation is the reverse of removal. Adjust the switch and tighten the bolts to 55-75 inch lbs. (6.2-8.5 Nm).
  7. Remove the jackstands and lower the vehicle.
  8. Connect the negative battery cable.
AOD Transmission

e7f4231.jpg

Removing the AOD neutral start switch
  1. Disconnect the negative battery cable.
  2. Raise and safely support the vehicle on jackstands.
  3. Disconnect the wiring from the switch.
  4. Using a deep socket, unscrew the switch.
  5. Installation is the reverse of removal. Tighten the switch to 10 ft. lbs. (14 Nm).
  6. Remove the jackstands and lower the vehicle.
  7. Connect the negative battery cable.
4R70W Transmission

2f68dfc.jpg


Removing the Manual Lever Position (MLP) sensor

As of 1994, the neutral safety switch is referred to as a Manual Lever Position Sensor (MLP).
  1. Disconnect the negative battery cable.
  2. Raise and safely support the vehicle on jackstands.
  3. Disengage the harness connector from the MLP sensor.
  4. Remove the 2 sensor attaching bolts and remove the sensor.
To install:
  1. Install the MLP sensor and install retaining bolts. Do not tighten, the sensor requires adjustment.
  2. Adjust the MLP sensor then tighten attaching screws to 80-100 inch lbs. (9-11 Nm).
  3. Remove the jackstands and lower the vehicle.
  4. Connect the negative battery cable.


ADJUSTMENT

C6 Transmission
  1. Hold the steering column transmission selector lever against the Neutral stop.
  2. Move the sliding block assembly on the neutral switch to the Neutral position and insert a 0.091 in. (2.3mm) gauge pin in the alignment hole on the terminal side of the switch.
  3. Move the switch assembly housing so that the sliding block contacts the actuating pin lever. Secure the switch to the outer tube of the steering column and remove the gauge pin.
  4. Check the operation of the switch. The engine should only start in Neutral and Park .

4R70W Transmission


4cc4151.jpg


Adjusting the MLP sensor

Park is the last detent when the manual control lever is full forward. Return 2 detents toward the output shaft for Neutral.
  1. Position the manual control lever in Neutral .
  2. Insert Gear Position Sensor Adjuster tool T93P-700 10-A or equivalent, into the slots.
  3. Align all 3 slots on the MLP sensor with 3 tabs on the tool.
  4. Tighten the attaching screws to 80-100 inch lbs. (9-11 Nm).

I hope help you. Good luck (rated this help).

Posted on Sep 18, 2009

localwonder
  • 6784 Answers

SOURCE: could a bad neutral safety switch cause my car not

HI. Yes, this is possible, but there are other reasons for this issue, as well. Use this step by step troubleshooting procedure to help isolate the issue. Step 4 deals with the neutral switch issues.

Step 1
Check for 12 volts on the large wire attached to the top terminal on the starter relay. It should have battery voltage. If not, the battery, terminals or wire is bad.


Step 2
Check the small wire on the solenoid for power when the key is in the start position. Remove the small wire on the solenoid and have a helper hold the key in the start position. Check the wire for battery voltage. If there is voltage, the starter is bad. If there is no voltage, replace the wire.


Step 3
Check the fuse in the fuse box under the hood on the left fender well. If it is good, check the relay by pulling it out and checking for power at one terminal with the key off. If there is no power, the problem is in the fuse box between the fuse and the relay. If there is power, have the helper hold the key in the start position once again and check for power at another terminal from the ignition key. If there is power, the relay is bad. If there is no power, the starter circuit is suspect.


Step 4

Check to see if there is power to the neutral safety switch if there is no power at the relay. Use the voltmeter to check for power with the key in start. If there is power going in, check for power going out. If there is no power going in, the security system or ignition switch is suspect. If there is power going in and none coming out, the switch is bad. If there is power coming out, the problem is between the neutral switch and the relay.


Step 5
Remove the cover on the bottom of the steering column. Check the solid yellow wire for power when the key is in the start position. If there is no power, the ignition switch is bad.

Posted on Dec 16, 2009

dncholas
  • 222 Answers

SOURCE: neutral safety switch '97 eclipse

Under dash driver side look behind the upper arm of clutch pedal and you should see a green and black wire coming from the button (switch) assembly on the firewall. The wires go up above the clutch pedal. About in the middle of under dash on the left side you should see a white connector these wires run to. Disconnect. I just had the problem and not only starts now but not stalling like it was but it's only been one day but tested it pretty good.

Posted on Aug 16, 2010

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Can't get mark 8 1996 lincoln in to park


Your neutral safety switch is bad.The neutral safety switch is a safety device that only allows you to start your engine when the automatic transmission is in either Park or Neutral. ... This switch prevents you from starting the engine when the transmission is in any gear other than Park or Neutral.

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bad neutral safety switch,here's a link to it, Repair Guides Instruments And Switches Back up Light Switch AutoZone com

Neutral Safety Switch

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DESCRIPTION

The neutral safety switch is a combination switch that also controls the backup lights and gear position indicators. The switch is located on the transaxle assembly.Here's a link to the part.
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My first instinct is to suggest cleaning the Neutral Safety Switch (NSS) using any type of spray on electrical contact cleaner. For other suggestions, go to: http://www.forums.turbobricks.com/showthread.php?t=39526

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Is there a "neutral safety


most automatics have a safety switch so they can only be started in park or neutral.
if there is a fault in the switch it would prevent the car from starting.
i dont know specifics on oldsmobiles, but on most cars the switch is located on or around the gear selector lever.

Feb 20, 2011 | 1999 Oldsmobile Cutlass

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2002 Jeep Liberty 3.7 automatic wont turn the starter over. LIghts good. Battery good. Could it be the starter, cables to the starter, neutral safety switch?


have same problem, ratan9 solution is pretty junk and I dont know why waste time posting it. After talking to local shop, to "test" the neutral safety switch, try to start in neutral, try to move shifter "farther" into park and turn key, listen to any clicks possible. If moving to neutral starts it you've got a bad switch. All the searching i've done it's either the safety switch, the ignition switch or a short in the harness somewhere

Apr 11, 2010 | 2002 Jeep Liberty

1 Answer

Sometimes my 94 honda accord will stall going down the road,sometimes it will not start until i let it roll and put it back in park,can it be my neutral safety switch?


A Bad neutral safety switch will keep it from starting. I dont think it will stop it while going..Its only meant to keep you from starting the car in neutral. Try to see if autozone can give you a computer diognostic,.it's free of charge. If they geta code,.they will tell you whats wrong.If you cant get there just call lots of times they know just by what you tell them it's doing.

Jan 14, 2010 | 1994 Honda Accord

1 Answer

My 2001 porsche boxter S 3.2 will not start in park, but will start normally in neutral, does anyone know why? (it's an automatic)


1.Shifter linkage could be out of adjustment, and not allowing the Neutral safety switch to be bypassed, when in the Park position.

The shift linkage, could move the arm of the neutral safety switch far enough, to bypass it when the shifter is in Neutral, but not far enough when the shifter is in Park.

2.Perhaps the Neutral safety switch is bad, or has come loose on it's mount, and is out of position.

Aug 01, 2009 | 2001 Porsche Boxster

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