code reader says code 122 TPS,but I am not sure?
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Lead Driver
Joined: Apr 2001
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From: Midwest
code reader says code 122 TPS,but I am not sure?
1995 f150 5.0 4x4 4r70w. A little history on the the truck. I just finished installing long tube headers on the truck last week. The engine was running GREAT for 3 days. Then I was on the way home from a camping trip yesterday,and had to get into the gas hard to get around a semi and out of the passing lane. The engine started "skipping"/missing I guess would be the best way to describe it at about 2000 rpm and kept up until it got up to about 3500 rpm,then it started pulling like a bat out of hell again. wasn't really bogging down,was accelerating,but with the skip/miss going on. Engine idles smooth as can be.Under light acceleration,the engine runs fine I checked all plug wires to see if one was loose,none were. looked around the headers and no wires touching anywhere. I ran the codes with my code scanner and code 122,TPS low voltage came up. Is this correct? Are these the symptoms of a bad throttle position sensor? I really want to be sure this is the problem,don't want to spend money if I don't need to. thanks!!
Elder User
Joined: Aug 2007
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you can check the tps by checking it with a ohm meter! Check it both ways by reversing your leads as you sweep thur it.Should see increasing and decreasing in the meter with no open line or break in the sweep.Then check fuel pressure sounds like to me it could be a fuel filter also.
FTE Legend
Joined: Jun 2006
Posts: 31,930
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From: Ottawa, Ontario
You can do a simple test of the TPS with a multimeter, with the motor off unplug it and put the meter leads across the sensor pins(meter on ohms). Now slowly cycle the throttle through it's full range from closed to WOT. The readings should smoothly increase or decrease depending how the meter is hooked up, and there should be no dead spots or glitches in the sweep. An analog meter with a needle will better display the sweep than a DMM, but it's not necessary. If you find a glitch or dead spot in the sensor with this test then the TPS is indeed bad.
Fleet Owner
Joined: Aug 2005
Posts: 23,667
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From: Easton,Ks
If you do not have a meter (and even if you do) a very accurate way to test the TPS is with the CONTINUOUS MONITOR (WIGGLE TEST MODE).
You can enter this test and then sit in the drivers seat and play with the throttle with the engine off and if the CEL (MIL) comes on the TPS is bad.
You can also wiggle the wiring and have someone watch the light on the dash.
Observe VOM or watch the CEL for indication of a fault while performing the following:
-- Move throttle slowly to WOT position.
-- Release throttle slowly to closed position.
-- Lightly tap on TP sensor (simulating road shock).
-- Wiggle TP harness connector.
CONTINUOUS MONITOR (WIGGLE TEST MODE)
Once entered, this mode allows the technician to attempt to recreate intermittent faults by wiggling or tapping components, wiring or connectors. The test may be performed during either KOEO or KOER procedures. The test requires the use of either an analog voltmeter or a hand-held scan tool or you can use the CEL.
You can enter this test and then sit in the drivers seat and play with the throttle with the engine off and if the CEL (MIL) comes on the TPS is bad.
You can also wiggle the wiring and have someone watch the light on the dash.
Observe VOM or watch the CEL for indication of a fault while performing the following:
-- Move throttle slowly to WOT position.
-- Release throttle slowly to closed position.
-- Lightly tap on TP sensor (simulating road shock).
-- Wiggle TP harness connector.
CONTINUOUS MONITOR (WIGGLE TEST MODE)
Once entered, this mode allows the technician to attempt to recreate intermittent faults by wiggling or tapping components, wiring or connectors. The test may be performed during either KOEO or KOER procedures. The test requires the use of either an analog voltmeter or a hand-held scan tool or you can use the CEL.
- To enter the Continuous Monitor mode during KOEO testing:
- Turn the ignition switch ON.
- Activate the test, wait 10 seconds, then deactivate and reactivate the test; the system will enter the continuous monitor mode.
- Tap, move or wiggle the harness, component or connector suspected of causing the problem; if a fault is detected, the code will store in the memory. When the fault occurs, either the STAR tester will light a red indicator (and possibly beep) or the analog meter needle will sweep once.
- To enter this mode in the KOER test:
- Start the engine and run it at 2000 rpm for two minutes. This action warms up the oxygen sensor.
- Turn the ignition switch OFF for 10 seconds.
- Start the engine.
- Activate the test, wait 10 seconds, then deactivate and reactivate the test; the system will enter the continuous monitor mode.
- Tap, move or wiggle the harness, component or connector suspected of causing the problem; if a fault is detected, the code will store in the memory.
- When the fault occurs, either the STAR tester will light a red indicator (and possibly beep) or the analog meter needle will sweep once.
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Lead Driver
Joined: Apr 2001
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From: Midwest
Bill,I don't understand how to start the continuous monitoring mode test.. In the instructions you posted,it just says "activate the test" but what do I need to do to activate the test? thanks!!
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
There are some diagrams of the STI and test connector in this link but nothing about this test.
Ford Computer Codes
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