2001 ford escape check engine light possible failed speed sensor
Went to trac auto for diagnostic and came back with failed output speed sensor. also just started when auto first turned on OD on off light flashes until auto is turned off and restarted. could these 2 problems be related and if so what is the remedy. thanks, wayne g.
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This may not be your problem but it does bring the vehicle in fail safe you may have a warranty
Date AUGUST, 2009
Model 1999-SONATA 2001-ELANTRA, SANTA FE & XG 2003-TIBURON 2005-TUCSON 2006-AZERA 2007-ENTOURAGE
An improperly functioning input speed sensor or output speed sensor may result in the following conditions:
"Check Engine" light on
Harsh P-R or P-D engagement shock
Transaxle in 3rd gear fail-safe
Diagnostic trouble codes
1. Using a GDS, check for DTCs in both the "Engine" and "Automatic Transaxle" menus. Record the DTC and description.
2. From the GDS, select:
"Auto Transaxle" menu
"Input speed sensor" and "output speed sensor". Drive the vehicle and monitor the input and output speed sensors. If the sensors show:
Continuous output, the wiring currently has no open/shorts. Go to Step 6.
No output, go to Step 3
3. Check the wiring harness visually for an open circuit or short circuit to ground. Check for a pinched harness at the PCM/TCM attachment bolts.
4. Disconnect the connectors at the input and output speed sensor and PCM/TCM. Check for bent pins or pins not fully inserted into the connector.
5. If a harness open/short is found, repair or replace the ECM control harness between the PCM/TCM and transaxle and go to Step 8. If not, go to Step 6.
he told you to take it to a transmission specialist because that is where those sensors are located. The speed sensor is located in the transmission. It reads the speed by counting the number of teeth on a relucter wheel. (thats the simple explanation). I sounds to me like there might be some debri in the transmission that could be affecting the reading. The engine computer uses that information to control the engine and transmission. Without that information the transmission could go into limp home mode and or have erratic shiffting plus other problems. I would really suggest you get it in for a test and evaluation asap. I do not consider this vehicle to be reliable or safe because the transmission could lockup and or otherwise fail. As a side note, these minivans are notorious for having failing transmissions and most transmission shops find that the majority of their work is on this minivans. One of the reasons I have just kept my full size van.
P1529 indicates that your TCM asked the ECM to turn on the check engine lamp.
The range switch and the output speed sensors are the items that are
abnormally affecting the operation of the transmission. The diagnostic
logic in your computer can distinguish these issues from one another,
so you'll definitely want to do both. You have no diagnostic code for
the input speed sensor (P0715) listed, so I have made no recommendation
to replace it. In my opinion, it's not a labor-intensive repair, so I
wouldn't recommend replacing it unless you have reason to believe it's
DTC - P0720 (OUTPUT SHAFT SPEED SENSOR SYSTEM)
Code No. P0720 Output shaft speed sensor system
If the output from the output shaft speed sensor is continuously 50%
lower than the vehicle speed for 1 second or more while driving in 3rd
or 4th gear at a speed of 30 km/h or more, it is judged to be an open
circuit or short-circuit in the output shaft speed sensor and
diagnostic trouble code No. P0720 is output. If diagnostic trouble code
No. P0720 is output four times, the transmission is locked into 3rd
gear or 2rid gear as a fail-safe measure.
Malfunction of the output shaft speed sensor
Malfunction of the transfer drive gear or driven gear
Malfunction of connector
Malfunction of the TCM
DTC - P0715 (INPUT SHAFT SPEED SENSOR SYSTEM)
Code No. P0715 input shaft speed sensor system
If no output pulse is detected from the input shaft speed sensor for 1
second or more while driving in 3rd or 4th gear at a speed of 30 km/h
(19 mph) or more, it is judged to be an open circuit or short-circuit
in the input shaft speed sensor and diagnostic trouble code No. P0715
is output. If diagnostic trouble code P0715 is output four times, the
transaxle is locked into 3rd gear or 2nd gear as a fail-safe measure.
Malfunction of the input shaft speed sensor
Malfunction of the underdrive clutch retainer
Malfunction of connector
Malfunction of the TCM
Yes, that sounds correct to be calibrated.and probably is what is causing your problem. Mass air flow sensors hardly ever go bad. They get dirty and set a code. Garages will try to sell you one when you can clean it with a throttle body cleaner. If you have your old one, clean it and put it back on, try it to see if it works better.
Some times the wheel speed sensor will go out on either side. This will make the A.B.S. light come on. But I dont see why the service engine light would come on. I would segest changing all wheel speed sensors and take it for a drive. The A.B.S. light should go out. If the service engine light dose not go out your local auto parts stors can run a diagnostics test to tell you what the light is on for.
Have the systems scanned for trouble codes with a scan tool.The ABS and Trac lights are on because there are fault codes stored.Access the fault codes,and they give you a direction that needs repaired.You likely have a wheel speed sensor damaged or just not working.Repair the speed sensor,clear the codes,all systems go.