Engine/Transmission (1998.5 - 2002) Check engine light/idle only

[TFlewitt]

Does anyone know what this problem might be, before I try having the ecm scanned for trouble codes? Driving along, the engine will suddenly go to idle and the accelerator pedal will not control the motor when pushed and the check engine light is lit. After a short period of time coasting at idle and pushing the pedal, the motor will suddenly respond again to the accelerator pedal, but the check engine light stays on. It is slowly starting to happen more frequently. Anyone know what it may be? Thanks!

 

[Jeddi]

Same thing has been happening to mine. Just went to the dealer today and they said it is the APPS, $531. 75 to fix... . Jeff

 

[DavidC]

Same thing has been happening to mine. Just went to the dealer today and they said it is the APPS, $531. 75 to fix... . Jeff

I would call these guy's and make sure about this one

http://www.trademotion.com/partloca...8&model=Ram 2500 pickup&year=1999&catalogid=1



Or there is this one althogh a little more pricey

http://hoeslidiesel.com/specials.htm



Dave

 

[Jeddi]

Hi David,



Thanks for the reply. Appreciate the site info, their cost is alot cheaper than the dealer. Do you know what it takes to swap out the sensor?



Thanks... . Jeff

 

[DavidC]

Have not done one personally. It is under the black plastic cover on the Drivers side. Would probably be best to remove battery power remove the sensor and then calibrate with a voltmeter and reinstall. There are some claibration guidelines on posts around hereand on DTT's site. Here are DTT's recommendations.



RESETTING THE APPS SENSOR.

(ACCELERATOR PEDAL POSITION SENSOR)

2ND GENERATION 24 VALVE TRUCKS ONLY.



LIST OF TOOLS NEEDED



DIGITAL VOLT METER

# 20 TORQUE BIT SOCKET

# 1 PHILLIPS

# 10 MM SOCKET



Proper service and repair procedures are vital to ensure personal safety of those performing the repairs. Standard safety procedures and precautions should be followed at all times to eliminate the personal injury or improper service, which could damage the vehicle or compromise its safety.

Although this material has been prepared with the intent to provide reliable information, no liability is assumed in reliance of this material.



It has come to my attention that a lot of people think by disconnecting & re-connecting the batteries and stepping on the throttle it is going to reset the apps, no, that is not correct. It is impossible to adjust your apps if you do not know where it is supposed to be set at. That is why you need the voltmeter.



This is the procedure I use to re-set the apps.



With the key on, engine off you need to probe the apps wire to see where your voltage is currently set at.

The best location to probe the wire is on the PCM (power control module) which is located off the passenger side of the firewall.



· You want the C1 connector, this is the connector closest to the engine,

· You want the orange wire with the dark blue tracer which is pin # 23

· Voltage should read somewhere around 0. 5 volts,

· At this point the voltage reading does not matter, it just has to be accurately written down for later reference.



*** TURN THE IGNITION OFF ON THE TRUCK ***









Resetting the APPS Sensor cont. page 2

(Accelerator Pedal Position Sensor)

2nd generation 24 valve trucks only.



· The apps sensor is located slightly above and a little to the left of the injection pump.



· Remove the black plastic cover that is located by your injection pump.



The two screws that are holding it are plastic, do not put any downward pressure on them or you will never get them off.



· Un do the 6 - 10 mm headed bolts that hold the bracketry in place.

(DO NOT REMOVE THE CABLES)



You will notice the apps is on the back of the bracketry that you just removed, it is held in place by 2 - 20 bit screws. These screws have a little bit of locktite on them so make sure you have a good socket and gently give a little tap with a hammer before attempting to loosen. Be very careful these screws strip very easily and you only get one shot at them.



· On the apps you will find a white tag that gives you the information on what the apps adjustment should be.



· After loosening the screws you can rotate the apps both clockwise and counter clockwise to get the adjustment you need.



· The reading you took at the beginning of the process on pin # 23 should match the white tag on your apps, if not adjust accordingly.



Dave

 

[DavidC]

If you do the Bob's link be sure to call them. That price looks awfully low for a 24 valve. It could be for a 12 valve.



Dave

 

[mroidt]

Daid C Thanks I was doing that this weekend .

I thought you could do it by disconnecting and

pushing the throttle too. thanks

 

[OL RATLR]

If you do the Bob's link be sure to call them. That price looks awfully low for a 24 valve. It could be for a 12 valve.



Dave

It says on it for a Gas engine. :-{}

 

[DavidC]

It says on it for a Gas engine. :-{}

Better read it again. There are 2.



Dave