Question about 2000 Chevrolet Impala

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Starter Interlock (IMS) Issues

What would cause the PCM module to show a "Current Gear" that is different from the IMS position? The IMS (TR) A/B/C/P values match the selector range but the resulting TR gear indication does not.

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6ya6ya
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Posted on Jan 02, 2017

  • 2 Answers

SOURCE: 2003 Chev Suburban 4WD...no indication of gear, ie. P,R,N,D,2,1

There was a customer satisfaction recall for this issue, however if you are like me and most others it is of little help as they only extended coverage to 75,000 miles. Mine is still readable (barely) time to spend some $$ and get it fixed before long.

Posted on Jun 01, 2009

  • 41 Answers

SOURCE: 2009 cobalt, key is in ignition, will turn to on

theres many different terms for it but it sounds to me like your cobalt went into "theft mode" (emergency mode, panic mode, etc.) your best bet would be to call the dealer and ask them how to "reset" your car.

Posted on Jan 27, 2010

  • 409 Answers

SOURCE: truck will only start in nuetral.NSBU switch

neutral safety switch is out of adjustment

Posted on Mar 09, 2010

  • 4044 Answers

SOURCE: I have a 1989 Chevy

I assume this is on the steering column. If so you are correct in assuming this is mechanical as that is actually controlled by a cable that is adjustable. Now, having said that, there are several different things that must be opened in order to make this adjustment and to be honest I don't remember all of them or the special tools needed to open some of them. I highly recommend you get the Haynes or Chilton's repair manual on your vehicle so you have the instructions handy to follow to open the column up and adjust this linkage without causing damage. There should be a screw type adjuster like you see on bicycle hand brakes to adjust the cable to show the correct location of the gear being selected.

Posted on Dec 10, 2010

dttech
  • 4803 Answers

SOURCE: 1991 Chevy Cheyenne 4.3L V6

The shift indicator on your vehicle is controlled by a small cable that wraps around the shifter yoke and is held on with a clip. If it does not move at all, there are two possible reasons for it. Either the cable has broken or the spring in the indicator end (in the instrument cluster) is broken. The spring is what makes it go one way, the cable makes it go the other way as it pulls against the spring.

The most likely howerver, is that the cable is broken.
If the cable has broken, I have had some luck fixing them by using an 18-22 Gauge wiring **** splicer. It all depends on exactly where the cable is broken. This will not work in all cases.

Posted on May 28, 2011

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I need to find out where can i find the neutral safety switch on a 2003 cadillac deville dts


It's not called a park neutral safety switch , it is Internal Mode Switch .located inside the transmission .
The transmission internal mode switch (IMS) is a multi-signal switch assembly attached to the lower control valve body. The IMS consists of a set of stationary contacts and a set of sliding contacts. The manual valve link assembly connects the sliding contacts to the manual valve. Electrically, the stationary contacts are connected to ground through the IMS ground circuit and the sliding contacts are connected to the PCM through four IMS signal circuits. The signal voltage at the PCM is high, ignition voltage, when a signal circuit is open and low, 0 volts, when a signal circuit is closed to ground. Each gear selector position grounds one or more of the signal circuits in a unique pattern that enables the PCM to determine gear selector position. Refer to Transmission Internal Mode Switch Logic...

What problem are you having ? Have you tested the switch or are you going to guess an hope this is the problem . The way to test ,hook up a factory scan tool an see what the PCM is seeing .

Sep 17, 2017 | Cadillac Cars & Trucks

2 Answers

05 Trailblazer transmission says neutral but gear shiftier is locked in park.


Automatic Transmission Shift Lock Control System
The automatic transmission shift lock control system is a safety device that prevents an inadvertent shift out of PARK when the engine is running. The driver must press the brake pedal before moving the shift lever out of the PARK position. The system consists of the following components:
• The automatic transmission shift lock control solenoid
• The automatic transmission shift lock control switch
With the ignition in the ON position, voltage is supplied to automatic transmission shift lock control switch. Voltage flows through the normally closed contacts of the automatic transmission shift lock control switch to the automatic transmission shift lock control solenoid. The automatic transmission shift lock control solenoid is permanently grounded. This energizes the automatic transmission shift lock control solenoid causing the transmission shift lever to be physically locked in the PARK position. When the brake pedal is pressed the contacts in the automatic transmission shift lock control switch open, de-energizing the automatic transmission shift lock control solenoid. This allows the shift lever to be move out of the PARK position.

Circuit Description
The transmission range (TR) switch is part of the park/neutral position (PNP) and back-up lamp switch assembly, which is externally mounted on the transmission manual shaft. The TR switch contains four internal switches that indicate the transmission gear range selector lever position. The powertrain control module (PCM) supplies ignition voltage to each switch circuit. As the gear range selector lever is moved, the state of each switch may change, causing the circuit to open or close. An open circuit or switch indicates a high voltage signal. A closed circuit or switch indicates a low voltage signal. The PCM detects the selected gear range by deciphering the combination of the voltage signals. The PCM compares the actual voltage combination of the switch signals to a TR switch combination chart stored in memory.

These are all electronically controlled , yur best bet would be to take your vehicle to the dealer .

Apr 19, 2017 | 2005 Chevrolet TrailBlazer

1 Answer

Where is neutral safety switch on 05 GMc envoy Denali


The transmission range (TR) switch is part of the park/neutral position (PNP) and backup lamp switch assembly, which is externally mounted on the transmission manual shaft. The TR switch contains four internal switches that indicate the transmission gear range selector lever position. The powertrain control module (PCM) supplies ignition voltage to each switch circuit. As the gear range selector lever is moved, the state of each switch may change, causing the circuit to open or close. An open circuit or switch indicates a high voltage signal. A closed circuit or switch indicates a low voltage signal. The PCM detects the selected gear range by deciphering the combination of the voltage signals. The PCM compares the actual voltage combination of the switch signals to a TR switch combination chart stored in memory.

Apr 14, 2017 | GMC Cars & Trucks

1 Answer

2005 Malibu Maxx. 1. Reverse lights won't stay on. They flicker or won't come on at all. 2. AC only works on 3. 4. The car locks and unlocks constantly when the car is in park.


Do you know how these thing's work ? How to do automotive electrical testing using a DVOM - digital volt ohm meter ? How to look up wiring diagrams to see what is involved in the working's of these systems ?

Basic Electricity for Service Techs Ohm law Current Flow Opens Shorts

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Electric Testing Techniques You Need to Know

Backup Lamps
The R-BEC 1 fuse in the underhood fuse block supplies battery positive voltage to the BACKUP LAMP relay through the BACKUP LAMP fuse. When the gear selector is placed in reverse, the body control module (BCM) supplies ground to the BACKUP LAMP relay. This energizes the BACKUP LAMP relay and current flows from the BACKUP LAMP relay to the backup lamps and then to ground. The backup lamps are grounded at G401 and G403.

The transmission range (TR) switch is part of the park/neutral position (PNP) and back-up lamp switch assembly (1), which is externally mounted on the transmission manual shaft. The TR switch contains four internal switches that indicate the transmission gear range selector lever position. The PCM supplies ignition voltage to each switch circuit. By grounding one or more of the switch circuits, the PCM detects the selected gear range by the state change of the switch input. Refer to Transmission Range Switch Logic . Switch input to the PCM is represented on the scan tool as HI and LOW. HI indicates an ignition voltage signal. LOW indicates a zero voltage signal. The four parameters represent transmission range switch signal A,B,C and Parity.

When the transmission is placed into reverse a input to the engine computer is received . The PCM - engine computer sends a massage on the C.A.N serial data network to the BCM - body control module . Which then energizes the back up lamps relay .

Same with the Door locks , controlled by the BCM .

Door Lock System Components
The Power Door Lock System consists of the following components:
• Body control module (BCM)
• Driver door lock switch
• Front passenger door lock switch
• Door lock actuators in each of the doors
• IBCM (PWR) 15-amp fuse
Door Lock System Controls
The Power Door Lock System is controlled by the body control module (BCM) and can be activated by any one of the following:
• A door lock switch Lock or Unlock actuation
• A keyless entry transmitter actuation
• An automatic door lock actuation
• An automatic door unlock actuation
• A last door closed locking (LDCL) actuation

A/C only works on 3,4 . we assume you mean the blower motor only works on med speed an high speed . This would be for the heat as well . Manual or automatic cilmate control ? The blower motor control module is probably at fault !

How to Diagnose Controller Area Network CAN

Door Locks Go Crazy 1 The BCM is receiving false input's for bad door sensor or switch .



Mar 31, 2017 | 2005 Chevrolet Malibu Maxx

1 Answer

2004 windstar wont start plenty of power but wont start no clicking sounds


What year ? For the 2004 model year, the Windstar was renamed the Ford Freestar. Anti-theft light lit on instrument cluster ? Battery good ! How about the battery cables ? Voltage drop test the starting system . Videos on you tube Starter Voltage Drop
Starter System The starting system cranks the engine at a speed fast enough to permit the engine to start.
  • Heavy cables, connectors and switches are used because of the large current required by the starter motor (11002) while it cranks the engine.
  • The amount of resistance in the starting circuit must be kept to a minimum to provide maximum current for starter motor operation.
  • A discharged or damaged battery (10655), loose or corroded connections or partially broken cables will cause slower than normal cranking speeds and may prevent the starter motor from cranking the engine.
The starting system includes:
  • the permanent magnet gear-reduction starter motor with a solenoid-actuated drive.
  • the battery.
  • a starter switch (part of the ignition switch (11572)).
  • the transmission range (TR) sensor.
  • The TR sensor in the starter control circuit prevents operation of the starter motor unless the selector lever is in NEUTRAL or PARK.
  • Starter Relay-Interrupt The starter relay (14N089) interrupt-consists of:
    • pull-in coil and
    • contacts.
    When the ignition switch is in the START position:
    • Current passes through the starterrelay-interrupt from the engine compartment power distribution box to the starter solenoid (11390) .
    • Anti-theft controller module activates relay-interrupt.
    • Pull-in coil in the starter relay-interrupt is activated and pulls the contacts apart.
    The starter relay-interrupt is deactivated when the ignition switch is in the RUN or OFF position.

Oct 22, 2016 | Cars & Trucks

1 Answer

2000 cadillac deville neutral saftey switch location and how to replace


Hi Andre , I'm guessing your Caddy won't start because of your wanting to replace the neutral safety switch .Before replacing or trying to,did check for B+ voltage coming through the switch to the PCM ? There are a lot thing's that could cause your caddy not to start !
Moving the ignition switch to the CRANK position sends a 12 V signal to the PCM ignition crank request input. The PCM verifies that it has received a valid theft password from the vehicle's theft deterrent module and that the transmission is in the PARK or NEUTRAL position. The PCM then grounds the control circuit of the START 1 relay. When the START 1 relay is energized it completes the B+ voltage circuit to the starter solenoid S terminal.
There could be a anti-theft system problem , is the security light lit on the instrument cluster ? Check the start 1 relay in the under hood fuse box . Did you test for Power an control at the relay ? Find the relay an pull it out of the fuse box , look on the bottom of it . You should see four set's of numbers 30,87 an 85,86 , 87 should B+ voltage ,30 goes to the starter solenoid .If you jumped those two the engine should crank over . If the starter is good an battery cables are good etc... I'm talking about jumping where the relay plugs into , not on the relay . Pin 86 should have B+ voltage with the key on , pin 85 goes to the PCM . PCM gives a ground to pin 85 energizing the relay sending B+ voltage to the starter .
Do you know where the PCM is located ?
Transaxle Range Switch Parity Input
connector 1 blue pin 41 ,white wire

Yes you need to test first because what you call neutral safety switch is really called
Transmission Internal Mode Switch
The transmission internal mode switch (IMS) is a sliding contact switch attached to the lower control valve body, within the transmission. The manual valve link assembly then connects the IMS to the manual valve. The four inputs to the PCM from the IMS indicate which position is selected by the transmission selector lever. This information is used for engine controls as well as determining the transmission shift patterns. The input voltage level at the PCM is high (ignition voltage) when the IMS is open and low when the switch is closed to ground. The state of each input is available for display on the scan tool. The four input parameters represented are Mode A , Mode B, Mode C and Mode P (Parity).
If the PCM detects an IMS transitional state between NEUTRAL and D4 while the vehicle is in motion, then DTC P1823 sets. DTC P1823 is a type B DTC.

Jul 31, 2016 | Cadillac DeVille Cars & Trucks

1 Answer

Shifter is locked in park on a 2002 bravada that sayes on dash its in reverse


PRND321 Display
The instrument panel cluster (IPC) displays the selected gear position as determined by the engine control module (ECM). The IPC - instrument panel cluster receives a serial data message from the ECM indicating the gear position. The PRND321 display blanks if:
?€¢
The ECM detects a malfunction in the transmission range switch circuit.


?€¢
The IPC detects a loss of serial data communications with the ECM. The automatic transmission shift lock control system is a safety device that prevents an inadvertent shift out of PARK when the engine is running. The driver must press the brake pedal before moving the shift lever out of the PARK position. The system consists of the following components:
?€¢
The automatic transmission shift lock control solenoid


?€¢
The automatic transmission shift lock control switch

With the ignition in the ON position, voltage is supplied to automatic transmission shift lock control switch. Voltage flows through the normally closed contacts of the automatic transmission shift lock control switch to the automatic transmission shift lock control solenoid. The automatic transmission shift lock control solenoid is permanently grounded. This energizes the automatic transmission shift lock control solenoid causing the transmission shift lever to be physically locked in the PARK position. When the brake pedal is pressed the contacts in the automatic transmission shift lock control switch open, de-energizing the automatic transmission shift lock control solenoid. This allows the shift lever to be move out of the PARK position.
The transmission range (TR) switch is part of the park/neutral position (PNP) and backup lamp switch assembly, which is externally mounted on the transmission manual shaft. The TR switch contains four internal switches that indicate the transmission gear range selector lever position. The PCM supplies ignition voltage to each switch circuit. As the gear range selector lever is moved, the state of each switch may change, causing the circuit to open or close. An open circuit or switch indicates a high voltage signal. A closed circuit or switch indicates a low voltage signal. The PCM detects the selected gear range by deciphering the combination of the voltage signals. The PCM compares the actual voltage combination of the switch signals to a TR switch combination chart stored in memory.
You need a Tech2 scan tool to diagnose this problem ! possible range sensor !

Sep 03, 2015 | Cars & Trucks

1 Answer

2005 GMC Yukon XL will not start. Took starter off and had it tested. The starter is good. However, the PCM fuse is blowing when attempting to start truck or turning turning the switch to start the tr


There is a dead short to ground on that circuit . There are videos on youtube showing how to find an fix a short . Do you know how to do automotive electrical testing ? How to find automotive electrical shorts Look at the wiring harness under the hood for rubbed through wire's , harness going to the PCM , also find out what if any thing else is powered by that fuse . Which PCM fuse ? There are a few PCM 1 , PCM B , etc...

PCM 1 Fuse
15A
Powertrain Control Module (PCM), Mass Air Flow (MAF) Sensor, Evaporative Emission (EVAP) Canister Purge Solenoid, Fuel Composition Sensor, Secondary Fuel Pump Relay

PCM B Fuse
20A
Powertrain Control Module (PCM)

Any one of these fuse will cause the engine not to crank . The PCM energizes the starter relay which supply's power to the starter .

Mar 11, 2017 | 2005 GMC Yukon XL

1 Answer

I have a 2004 Buick Regal LS. The transmission indicator in dash says its in Drive but the car is in Park and wont start. It started when I tried starting it after going to the store. At first the car...


It's probably a bad internal mode switch . The sensor is input to the PCM - engine computer .
The lever assembly-manual shaft detent with internal mode switch (IMS) is a sliding contact electrical switch assembly that corresponds to the PRNDL position selected. Each of the PRNDL positions has a unique ground pattern on four wires from the PCM.
The assembly consists of two major components:
• The internal mode switch that consists of:
- The housing (1), which makes up the stationary contacts.
- The insulator (2), which makes up the moving contacts and is secured on the detent lever (4).
• The lever assembly which consists of:
- The manual shaft (3)
- The detent lever (4)
The range detection is accomplished by securing the moving contacts to the detent lever. When the driver selects a PRNDL position, the detent lever inside the transmission rotates. This rotates the insulator which in turn grounds the four wires in a unique pattern for each gear selection, corresponding to the PRNDL position selected. The IMS is electrically connected by five wires (four of which the PCM supplies voltage to and one wire that is a common ground) to the transmission pass through connector.

Range Selector Displays Incorrect Range

The transmission internal mode switch (IMS) is a sliding contact switch attached to the selector detent inside the transmission side cover. The four inputs to the PCM indicate the position of the transmission range selector. The input voltage level at the PCM is high, B+, when the IMS is open and low when the switch is closed to ground. The four input parameters represented are Signals A, B, C and P, Parity. Refer to Transmission Internal Mode Switch Logic .
1
Install a scan tool.
Turn ON the ignition, with the engine OFF.
Select IMS on the scan tool.
Place the range selector in each transmission range: P, R, N, D4, D3, D2 and D1.
Does each range selected match the scan tool IMS display?
--
Go to Powertrain Control Module Replacement in Engine Controls - 3.1L or Intermittent Conditions in Engine Controls - 3.8L
Go to Step 2
2
Select IMS A/B/C/P on the scan tool.
Place the range selector in each transmission range: P, R, N, D4, D3, D2 and D1.
Does the IMS A/B/C/P display the specified values for each range?
HI/HI/HI/HI
Go to Step 12
Go to Step 3

Your best bet , take it to a qualified repair shop !

May 12, 2017 | 2004 Buick Regal

1 Answer

'04 Trailblazer. Indicator shows drive but it's not in drive.


The transmission range (TR) switch is part of the park/neutral position (PNP) and backup lamp switch assembly, which is externally mounted on the transmission manual shaft. The TR switch contains four internal switches that indicate the transmission gear range selector lever position. The powertrain control module (PCM) supplies ignition voltage to each switch circuit. As the gear range selector lever is moved, the state of each switch may change, causing the circuit to open or close. An open circuit or switch indicates a high voltage signal. A closed circuit or switch indicates a low voltage signal. The PCM detects the selected gear range by deciphering the combination of the voltage signals. One of these circuits it what is causing your problem but I hope this helps you understand some.

Jul 06, 2009 | 2004 Chevrolet TrailBlazer

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