Question about 1999 Volvo S70

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Why is my transmission speed sensor showing no signal

I put on a new one and the check engine light still comes on . Is it my wire harness or could my ECM be going bad? because my scanner is showing no signal.

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  • 412 Answers

You need to check for power to the sensor with a volt meter. If you have power then you need to have a professional check it as you will need a lab scope or graphing multi meter to determine if you are getting a signal to the ECU

Posted on Apr 16, 2015

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Posted on Jan 02, 2017

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SOURCE: engine management light volvo s40 problem

The best thing is to go to your local Volvo maintenance shop or Volvo experts to find out whats the problem..usually the coomon ones I think is the programs inside its ECU unit..you try this..ask the volvo experts to reset the ECU and lets see..if problem arise then it is no doubt you might need the sensor..hope this help..

Posted on Nov 03, 2008

  • 184 Answers

SOURCE: Check engine light on and Troubleshooting code is P0116

Hi, I managed to find a graphic illustration of the ECT sensor.
02c7b2a.gif

Good luck!

Posted on Dec 15, 2008

  • 1 Answer

SOURCE: Transmission Service Required message

I got Volvo S80 2.4 year 2001 there is a message on the screen Transmission Service Required can you tell me what does it mean?

Posted on Jul 28, 2009

  • 164 Answers

SOURCE: No power to injectors on 1984 Volvo 240 DL New wiring harness

ok you must see what is missing. an injector requires 12volts to operate. the 12+ should be constant when key on and engine on or off,and the ground pulses. check both ways and see whats not there. if you have no pulse then ecm,cam sensor, or wiring faulty. is power+ is gone, then you have wiring trouble wich is the easier soulution. check and let us know

Posted on Sep 02, 2009

  • 1 Answer

SOURCE: Volvo V50, VIN YV1MW753152104530, engine D4204T.

Thanks for your interest, problem solved in local service workshop.
Regards,
Nenad Danicic

Posted on Oct 14, 2009

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Someter dosnt work code p0500 when code cleared eng light comes on as vehicle shifts into 2nd everytime same code reoccures


code p 0500 refers to vehicle speed sensor(VSS)--circuit malfunction===causes --wiring--VSS --- ECM
engine lights report on both engine problems and transmission problems
check all wiring connections to the transmission
the VSS reports to the transmission control module, the road speed and that is when the TCM knows when to change ratios
At this point I would be closely checking the wires and harness connections and then replace the VSS

Apr 12, 2016 | Cars & Trucks

1 Answer

I have a1999 cougar the speed on stop working now the transmission will not shift in less you manual shift your self what could be the problem


The speedometer stopped working ? is this what you meant ? You probably have a bad VSS - vehicle speed sensor . The VSS is an input to the PCM - engine computer , besides being a signal for the speedometer it is used for shift control and other thing's .
Vehicle Speed Sensor The vehicle speed sensor (VSS) (Figure 43) is a variable reluctance or Hall-effect sensor that generates a waveform with a frequency that is proportional to the speed of the vehicle. If the vehicle is moving at a relatively low velocity, the sensor produces a signal with a low frequency. As the vehicle velocity increases, the sensor generates a signal with a higher frequency. The PCM uses the frequency signal generated by the VSS (and other inputs) to control such parameters as fuel injection, ignition control, transmission/transaxle shift scheduling and torque converter clutch scheduling. You could possibly have a DTC stored in the PCM.
P0500 - Vehicle Speed Sensor (VSS) Malfunction Indicates the powertrain control module (PCM) detected an error in the vehicle speed information. Vehicle speed data is received from either the vehicle speed sensor (VSS), transfer case speed sensor (TCSS), anti-lock brake system (ABS) control module, generic electronic module (GEM), or central timer module (CTM). If the engine rpm is above the torque converter stall speed (automatic transmission) and engine load is high, it can be inferred that the vehicle must be moving. If there is insufficient vehicle speed data input, a malfunction is indicated and a DTC is set. On most vehicle applications the malfunction indicator lamp (MIL) will be triggered when this DTC is set.
  • Open in VSS+/VSS- harness circuit.
  • Open in TCSS signal or TCSS signal return harness circuit.
  • Short to GND in VSS harness circuit.
  • Short to GND in TCSS harness circuit.
  • Short to PWR in VSS harness circuit.
  • Short to PWR in TCSS harness circuit.
  • Open or short in the vehicle speed circuit(s) (VSC) between the PCM and appropriate control module.
  • Damaged VSS or TCSS.
  • Damaged wheel speed sensors.
  • Damaged wheel speed sensor harness circuits.
  • Damage in module(s) connected to VSC/VSS circuit.
  • Damage drive mechanism for VSS or TCSS.
Diagnostic Aids: - Monitor VSS PID while driving vehicle. This DTC is set when the PCM detects a sudden loss of VSS signal over a period of time. If vehicle speed data is lost, check source of where vehicle speed signal originates. Note TCSS does not have a PID, circuitry frequency must be checked for sudden loss of sensor signal. P0501 - Vehicle Speed Sensor (VSS) Range/ Performance Indicates the powertrain control module (PCM) detected an error in the vehicle speed information. This DTC is set the same way as P0500, however the malfunction indicator lamp (MIL) is not triggered.
  • Refer to possible causes for P0500.
Refer to diagnostic aids for P0500.

Oct 26, 2015 | Cars & Trucks

3 Answers

2000. What are the probable causes for DTC P0720?


the output speed sensor is not at fault; check the fluid level in the transmission. If that won't help, the transmission is bad.

Jul 27, 2015 | Honda Odyssey Cars & Trucks

1 Answer

Flashing code 15,54,83


Fault Code 15

SynopsisDescription: No speed/distance sensor signal Power loss light: Off Limp-in mode: None
Possible CausesBad connector or wiring - Check the connector at the sensor and on the wiring harness near the fuel rail for corroded contacts or broken or melted wires. Check the wiring for continuity.Speed/distance sensor failure - If you have a 1992 or earlier transmission, these sensors are prone to failure. See the Hall Effect Speed/Distance Sensor Conversion page to see if you can repair this problem once and for all. The sensor is located on the transmission on top of the long casting where the right axle connects.
Diagnostic MethodTrigger Parameters
- Throttle has been closed for 7 seconds - Engine speed 768 rpm above target idle speed - Speed sensor not producing a signal

Results If Component FailsFault code 15 is stored, but there is no "limp-in" mode for this fault code and the power loss light does not turn on. Any pulses from the sensor are considered valid.

Fault Code 54

SynopsisDescription: No fuel injector sync pickup signal during engine rotation Power loss light: On Limp-in mode: Logic module will guess at injector timing
Possible Causes:Bad connection or wiring - Check the wiring and connections between the hall effect sensor (located underneath the distributer cap) and the logic module. Check the continuity of the two 3 conductor cables coming out of the sensor--these are prone to fatiguing and breaking inside the insulation where they exit the sensor if the cables are not properly tied down. You may be able to resolder them. Clean and regrease any corroded connectors with dielectric grease and repair any shorts.
Hall effect sensor failure - Check the two, flat 3 conductor cables coming out of the sensor. These often fatigue where they exit from the sensor. Upon replacing the sensor, make sure the cables are clipped or tied to the distributor cap shroud (or elsewhere) so they do not swing around.
Diagnostic MethodTrigger Parameters

- Engine cranking or running (signal coming from ignition reference sensor) - No signal from the fuel injector sync pickup sensorResults If Component Fails
Fault code 54 is stored. The engine will stall and will not start.

Hope helps.

Mar 14, 2012 | 1993 Chevrolet C1500

1 Answer

Engine stalls, p0720 engine light on. Runs ok than goes sporadic.


There are 2 possibilities here:
1.- There may be a problem with the new speed sensor, the electrical wiring between the speed sensor and the PCM, or an internal PCM problem. To see if VSS signal is present at the PCM a scan tool capable of displaying live data is required.

2.- There is a recall action on this model year for erroneous speed sensor signals; the cure is an updated software calibration. If your truck has not yet had the updated calibration installed, you should call your local Dodge dealership with your VIN number and ask the service department to check to see if there are any open recall actions on your vehicle. If the software calibration has not been updated yet, they will perform this procedure free of charge for you. If you do not have the current software calibration in your PCM to correct the VSS issue, you need to have this done before proceeding any further with attempting to diagnose this problem

This sensor is located at the rear of the transmission.

Symptom: P-0720 LOW OUTPUT SPEED SENSOR RPM, ABOVE 15 MPH
When Monitored and Set Condition: P-0720 LOW OUTPUT SPEED SENSOR RPM, ABOVE 15 MPH

When Monitored: Continuously with the key on, engine running, and gear selector not in park or neutral.
Set Condition: This code is set if the vehicle speed (as determined from the vehicle speed sensor), is above 15 MPH, and the output shaft speed is below 60 RPM for 2.6 seconds.

POSSIBLE CAUSES DTC CODE RETURNS:
OUTPUT SPEED SENSOR DEFECTIVE
PARK/NEUTRAL SWITCH CODE PRESENT
OUTPUT SPEED SENSOR GROUND CIRCUIT OPEN
OUTPUT SPEED SENSOR GROUND CIRCUIT SHORT TO GROUND
OUTPUT SPEED SENSOR SIGNAL CIRCUIT OPEN
OUTPUT SPEED SENSOR SIGNAL CIRCUIT SHORT TO GROUND
PCM DEFECTIVE (DRB SHOWS > 60 RPM)
OUTPUT SPEED SENSOR HARNESS OBSERVABLE DEFECT
OUTPUT SPEED SENSOR WIRING HARNESS INTERMITTENT DEFECTIVE

Hope helps.

Sep 14, 2011 | Dodge Ram 1500 Cars & Trucks

1 Answer

Trubleshooting p0502 honda element


P0502 is a Vehicle speed sensor issue:
P0502 Description The vehicle speed sensor outputs a 4 pulse signal for every revolution of the rotor shaft, which is rotated by the transmission output shaft via the driven gear. After this signal is converted into a more precise rectangular waveform by the waveform shaping circuit inside the combination meter, it is then transmitted to the ECM. The ECM determines the vehicle speed based on the frequency of these pulse signals.

speed_sensor.gif Symptoms - Engine Light ON (or Service Engine Soon Warning Light)
- Speedometer may not work properly
- Transmission shifting problem Possible Causes - Vehicle speed sensor harness or connectors is open or shorted
- Vehicle speed sensor
- Combination meter
- Faulty ECM.

Jul 13, 2011 | 2003 Honda Element

1 Answer

1998 Chrysler Sebring convertible Not shifting into drive check engine light came on, error code PO715


DTC P0715 CHRYSLER - Input Speed Sensor 1 Circuit
P0715 is detected when TCM or ECM does not receive the proper signal from the sensor.

The input speed sensor detects the primary pulley revolution speed and sends a signal to the Transmission Control Module (TCM) and Engine Control Module (ECM).

Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Possible shifting problems

Possible causes
- Transmission speed sensor circuit is open or shorted.
- Poor transmission speed sensor circuit connection
- Faulty transmission speed sensor

Hope this clues helps to solve it.

Jun 02, 2011 | 2003 Chrysler Sebring

1 Answer

1993 toyota camry le 4cl speedometer wount work?


It can be faulty vehicle speed sensor .The sensor connects to the differential.The sensor in the transmission that tells the instrument panel how fast the transmission is turning. Sometimes that sensor breaks.
There is a speed sensor on the transmission that sends a signal to the
speedometer control on the back of the instrument cluster, and diagnosis is
pretty straightforward. The On-board Diagnostics Generation II (OBD II)
scan tools used by professional technicians should have the ability to read
the signal generated by the transmission speed sensor and therefore check
the function of the speed sensor. Even if the technician's scan tool does
not have this capability, the sensor can be checked with a volt meter at the
sensor itself.

If the sensor is putting out the proper signal, then the next step would be
to check the wiring between the speed sensor and the speedometer control by
checking the signal at the wire harness at the speedometer control. If the
signal is good, then the speedometer control is bad, and if the signal is
bad, then the wiring between the sensor and speedometer control is bad. The
most time confusing part of doing all these checks would be removing the
instrument cluster to get at the speedometer control, about a half-hour
total for all the checks.----------
If the needle moves you have a broken pinion or counter gear.If not, then I would replace both speedometer cables.---------------Thank you.

Mar 01, 2011 | Toyota Camry Cars & Trucks

2 Answers

Recently changed my engine,now the transmission,not changing gears or shifting properly


Check your wire harness to the transmission located on the drivers side under the battery, look for any damaged or disconnected wire harness and also inspect the wire leads to the harness at your TCM (transmission control module) located on the passenger side fender. Check the fuse to your TCM and don't forget to check the fuses under the dash on the drivers side, replace any fuse that has gone bad.
Good luck and hope this helps, 85% of the time it's going to be a electrical issue that causes your transmission not shift properly. The other causes for your transmission issues are: TPS sensor and the input speed sensor and out put speed sensor in your transmission.
Thank you for using Fixya and start with the simple and check the fuses and wire harness. Good luck

Mar 29, 2010 | 1996 Dodge Caravan

2 Answers

I got a P O 717 code what is it ???


P0717: Input/Turbine Speed Sensor Circuit No Signal.
This code shows because the computer isn't getting any signal from the sensor. Either the sensor is dead or there's a circuit issue (bad wiring, etc).

The Input/Turbine Speed Sensor is the sensor the computer uses to to monitor the the efficiency of the transmission. The computer reads the speed from the input shaft and compares it to the speed of the output shaft. If the speed is off it attempts to correct it by boosting the fluid pressure to compensate. When that fails it trips the P0717 error code. In most cases either the sensor is dead or there's a problem in the wiring harness.

There are issue of intermittent connection trouble with this circuit. That would cause the on off problem.
Hope this helps.

Nov 11, 2009 | 2003 Buick LeSabre

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