Dodge Cummins Diesel Forum - Reply to Topic
98.5-02 Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect..NO ADVERTISING .

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  Topic Review (Newest First)
09-20-2019 08:03 PM
Voltronics
Quote:
Originally Posted by Clunk View Post
Good work!
Hope it stays good for you.
Truck has been running good decided to hook up my buddies scanner and the codes are still stored in the truck plus there was the same codes but under pending no cel tho. Does this mean I did not fix the problems. I cleared the codes for no but want to know if I didn’t fix the problem by putting in a new apps
09-14-2019 02:05 PM
Clunk Good work!
Hope it stays good for you.
09-14-2019 11:39 AM
Voltronics Put the timbo apps in took it for a drive and felt just like it did before the problems no surging or bucking either I hope this apps holds up
09-14-2019 10:53 AM
Voltronics Just tested for bad sensor it starts at .36 at idle and climbs to 3.56 I’m stuck idk if this is bad or not
09-13-2019 09:19 PM
Voltronics Just took the truck for a ride and after I went to see if anymore codes came up and got a code for a p0122 now plus the 1693 which I’m guessing is still the p0121 code
09-13-2019 03:30 PM
Voltronics
Quote:
Originally Posted by bigfish95971 View Post
If batteries and alt are all good bad connections are usually the problem. A bad APPS can be the problem but not usually. The Timbo is a problem sometimes but not usually for LOW Voltage. It is actually a problem wiht too HIGH of idle voltage casueing the ECM to think you are accelerating and surge the throttle not dead pedal. Definitely clean all related terminals and connections and do the APPS reset, it can never hurt. if done right.
Disconnect batteries and leave key on for 30 min to overnight.
Key to off.
Reconnect batteries after cleaning to metal to perfect metal connection.
turn key to ON three times leaving on the third time.
Slowly depress the pedal to full throttle and release slowly one time.
Turn key off and then start.

Both input and idle or throttle voltage can be tested by probing the apps plug and checking with key to on. Idle and throttle are on output Pin #3. Check schematic for input pin #.

All trucks should be 5 volts apps input and about .48 to 529v at idle voltage running or just key to ON. It should graduate smoothly to about 4 volts at WOT. The Timbo has a preset non adjustable idle voltage of about .64 volts(too High) causing the surging problem. Factory and other apps are adjustable with the torx screws and rotation on the back, not at the throttle stop screws, the stop is just a throttle resting place to eliminate slack in cables. but dead pedal(low voltage) These voltages can be monitored by running a jumper wires to the cab and a voltmeter while running to test the apps.

Do that to eliminate apps issues.
I believe ECM provides the 5 volts to the apps and monitors its signals and relays them to the VP44. The idle in the VP is separate from the throttle acceleration is why it will idle but gets dead pedal.
I’m very new to all of this found a schematic for the apps plugs tested it and got this number with the truck in the on position
Also when I tested the resistance I don’t know if I did it right I took the plug in the previous picture put the paper clip in pin 4 and measures the resistance with ohms and got .5
09-13-2019 03:06 PM
Voltronics
Quote:
Originally Posted by bigfish95971 View Post
If batteries and alt are all good bad connections are usually the problem. A bad APPS can be the problem but not usually. The Timbo is a problem sometimes but not usually for LOW Voltage. It is actually a problem wiht too HIGH of idle voltage casueing the ECM to think you are accelerating and surge the throttle not dead pedal. Definitely clean all related terminals and connections and do the APPS reset, it can never hurt. if done right.
Disconnect batteries and leave key on for 30 min to overnight.
Key to off.
Reconnect batteries after cleaning to metal to perfect metal connection.
turn key to ON three times leaving on the third time.
Slowly depress the pedal to full throttle and release slowly one time.
Turn key off and then start.

Both input and idle or throttle voltage can be tested by probing the apps plug and checking with key to on. Idle and throttle are on output Pin #3. Check schematic for input pin #.

All trucks should be 5 volts apps input and about .48 to 529v at idle voltage running or just key to ON. It should graduate smoothly to about 4 volts at WOT. The Timbo has a preset non adjustable idle voltage of about .64 volts(too High) causing the surging problem. Factory and other apps are adjustable with the torx screws and rotation on the back, not at the throttle stop screws, the stop is just a throttle resting place to eliminate slack in cables. but dead pedal(low voltage) These voltages can be monitored by running a jumper wires to the cab and a voltmeter while running to test the apps.

Do that to eliminate apps issues.
I believe ECM provides the 5 volts to the apps and monitors its signals and relays them to the VP44. The idle in the VP is separate from the throttle acceleration is why it will idle but gets dead pedal.
I’ll do more tests Saturday and see what happens. As regards to the timbo apps should I just try and return it since you think it’s not my apps causing a low voltage problem
09-12-2019 01:08 AM
bigfish95971 If batteries and alt are all good bad connections are usually the problem. A bad APPS can be the problem but not usually. The Timbo is a problem sometimes but not usually for LOW Voltage. It is actually a problem wiht too HIGH of idle voltage casueing the ECM to think you are accelerating and surge the throttle not dead pedal. Definitely clean all related terminals and connections and do the APPS reset, it can never hurt. if done right.
Disconnect batteries and leave key on for 30 min to overnight.
Key to off.
Reconnect batteries after cleaning to metal to perfect metal connection.
turn key to ON three times leaving on the third time.
Slowly depress the pedal to full throttle and release slowly one time.
Turn key off and then start.

Both input and idle or throttle voltage can be tested by probing the apps plug and checking with key to on. Idle and throttle are on output Pin #3. Check schematic for input pin #.

All trucks should be 5 volts apps input and about .48 to 529v at idle voltage running or just key to ON. It should graduate smoothly to about 4 volts at WOT. The Timbo has a preset non adjustable idle voltage of about .64 volts(too High) causing the surging problem. Factory and other apps are adjustable with the torx screws and rotation on the back, not at the throttle stop screws, the stop is just a throttle resting place to eliminate slack in cables. but dead pedal(low voltage) These voltages can be monitored by running a jumper wires to the cab and a voltmeter while running to test the apps.

Do that to eliminate apps issues.
I believe ECM provides the 5 volts to the apps and monitors its signals and relays them to the VP44. The idle in the VP is separate from the throttle acceleration is why it will idle but gets dead pedal.
09-10-2019 07:14 PM
Voltronics
Quote:
Originally Posted by Clunk View Post
It's a long shot but when I get a dead pedal, I disconnect the APPS wiring
connector to the truck wiring then reconnect.
I found a discolored pin in that connector a few years ago and
connected/disconnected/reconnected to try to get a better connection.

Now, reset the "TPS" Accelerator Pedal Position Sensor/APPS;
Disconnect the negative cables on both batteries for a while, reconnnect, turn the keyswitch ON, slowly floor the throttle, slowly release, turn the keyswitch Off.
Now start and test ride.
The APPS Reset is sometimes necessary after changing the batteries.
I’ll have to do that Friday I reset the apps once and it seemed to do nothing so I’ll have to disconnect the original apps and reconnect and reset before I try the Timbo apps
09-10-2019 07:06 PM
Clunk It's a long shot but when I get a dead pedal, I disconnect the APPS wiring
connector to the truck wiring then reconnect.
I found a discolored pin in that connector a few years ago and
connected/disconnected/reconnected to try to get a better connection.

Now, reset the "TPS" Accelerator Pedal Position Sensor/APPS;
Disconnect the negative cables on both batteries for a while, reconnnect, turn the keyswitch ON, slowly floor the throttle, slowly release, turn the keyswitch Off.
Now start and test ride.
The APPS Reset is sometimes necessary after changing the batteries.
09-10-2019 04:47 PM
Voltronics
Quote:
Originally Posted by Clunk View Post
bigfish95971 reported a much better APPS than anything else......I just forget. It's available at some local chain type auto parts stores.
So I shouldn’t have bought timbos apps and if it’s throwing the low voltage code and my batteries and alternator check out will replacing with a new one fix my problem most likely
09-07-2019 07:18 PM
Clunk bigfish95971 reported a much better APPS than anything else......I just forget. It's available at some local chain type auto parts stores.
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