tps ?
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Senior User
Joined: Sep 2008
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From: marinette wi
tps ?
97 psd, auto 4x4 truck always seamed to surge a very small amout it for a few years so small you just barly feel it. but now yesterday it got real bad at all speeds holding foot still on the throttle would speed up and slow down quite abit and now today even worse, on the way to the store was just that i had my foot touching pedel in town keeped getting faster over 50. when came out to go home went to go would only idle no responce . step on it 3 or 4 times got cel and then it went ,light aslo went out also and now it shifts all messed up
Post Fiend
Joined: Oct 2003
Posts: 5,903
Likes: 1
From: MICHIGAN
Sounds like a TPS is in your future. You can remove it and try cleaning it up. Check the wiring too.
It's nothing more than a potentiometer. The windings can get dirty causing erratic signals/RPM control.
It may be the IVS is out of adjustment when you set the CEL. Get the codes read and report back here.
You can check the TPS for dead spots with a volt meter.
It should give a nice steady increase when pressing the pedal.
Look here:
https://www.ford-trucks.com/forums/5...ge-on-tps.html
The IVS tab can be adjusted by bending the tab. It should be open at idle.
It's nothing more than a potentiometer. The windings can get dirty causing erratic signals/RPM control.
It may be the IVS is out of adjustment when you set the CEL. Get the codes read and report back here.
You can check the TPS for dead spots with a volt meter.
It should give a nice steady increase when pressing the pedal.
Look here:
https://www.ford-trucks.com/forums/5...ge-on-tps.html
The IVS tab can be adjusted by bending the tab. It should be open at idle.
Thread Starter
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Senior User
Joined: Sep 2008
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From: marinette wi
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Post Fiend
Joined: Oct 2003
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From: MICHIGAN
You don't have one....A break out box is a test instrument that is usually found in dealerships only.
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Joe Kucinski
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From: Huntsville, Tx
the od light bulb can go out, but there is a simple test to see if the bulb works, just hit the od off button and see if the light comes on. if it does the light works if the light doesnt come.....you know what it means.
Post Fiend
Joined: Oct 2003
Posts: 5,903
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From: MICHIGAN
3.99V is OK but a tad low, you want that to be a close to 4.5V to obtain wide open throttle. Higher than 4.5V will set a CEL. Nothing to worry about for now, that is not your problem.
__________________________________________________ ________
Use the pictures in this -->LINK<-- for reference:
AP= Accelerator Pedal or TPS
DTC 0122 indicates the AP sensor circuit low input.
Possible causes:
- AP sensor may not be seated properly (tightened down)
- Damaged AP sensor
- Open harness
- Grounded harness
- Damaged PCM
- Key on, engine off.
- NGS Tester installed.
- Access AP PID (voltage).
- Depress accelerator pedal while observing voltage reading on NGS Tester
Next step:
INDUCE OPPOSITE FAILURE
- Disconnect AP sensor connector and jumper VREF pin to AP signal wire.
- Does the voltage stay on and read over 4.5v?
No= Next Step
CHECK VREF CIRCUIT VOLTAGE
- Key off.
- AP sensor disconnected.
- Key on, engine off.
- Measure voltage between VREF circuit and ground.
- Is voltage 5v ± .5?
No=SERVICE open in VREF Circuit 351 (BR/W). CLEAR DTCs and RETEST
The remaining steps requires a breakout box, you may be going to the dealer
or someone here will have more info.
Hotshot
Joined: Aug 2006
Posts: 10,764
Likes: 39
.66v is OK, it needs to be between .37 and 1.6V in order for the IVS to transition without setting a CEL
3.99V is OK but a tad low, you want that to be a close to 4.5V to obtain wide open throttle. Higher than 4.5V will set a CEL. Nothing to worry about for now, that is not your problem.
__________________________________________________ ________
Use the pictures in this -->LINK<-- for reference:
AP= Accelerator Pedal or TPS
DTC 0122 indicates the AP sensor circuit low input.
Possible causes:Since you have a reading between .37 and 1.6V you need to clear the code and see if it returns....But be sure you checked all of the above first. You are having an intermittent failure, something may be loose or dirty.
Next step:
INDUCE OPPOSITE FAILUREYes= Clear the code and re-test
No= Next Step
CHECK VREF CIRCUIT VOLTAGEYes= Next step
No=SERVICE open in VREF Circuit 351 (BR/W). CLEAR DTCs and RETEST
The remaining steps requires a breakout box, you may be going to the dealer
or someone here will have more info.
3.99V is OK but a tad low, you want that to be a close to 4.5V to obtain wide open throttle. Higher than 4.5V will set a CEL. Nothing to worry about for now, that is not your problem.
__________________________________________________ ________
Use the pictures in this -->LINK<-- for reference:
AP= Accelerator Pedal or TPS
DTC 0122 indicates the AP sensor circuit low input.
Possible causes:
- AP sensor may not be seated properly (tightened down)
- Damaged AP sensor
- Open harness
- Grounded harness
- Damaged PCM
- Key on, engine off.
- NGS Tester installed.
- Access AP PID (voltage).
- Depress accelerator pedal while observing voltage reading on NGS Tester
Next step:
INDUCE OPPOSITE FAILURE
- Disconnect AP sensor connector and jumper VREF pin to AP signal wire.
- Does the voltage stay on and read over 4.5v?
No= Next Step
CHECK VREF CIRCUIT VOLTAGE
- Key off.
- AP sensor disconnected.
- Key on, engine off.
- Measure voltage between VREF circuit and ground.
- Is voltage 5v ± .5?
No=SERVICE open in VREF Circuit 351 (BR/W). CLEAR DTCs and RETEST
The remaining steps requires a breakout box, you may be going to the dealer
or someone here will have more info.
tried to rep ya ,,but you know the drill...
