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Posted on Jan 02, 2017
SOURCE: 96 nissan quest code p0120
this is an obd2 trouble code table, it can help you understand the meaning of code.
and for p0120
Sticking throttle return spring
MAP or TPS connector corrosion
Misrouted harness causing chafing
If you have access to a scan tool, with KOEO (Key on engine off) observe the TPS voltage. With throttle closed, voltage should be about .45 volts. It should gradually sweep upwards to approximately 4.5 to 5 volts as you depress the throttle. Sometimes only a scope can capture an intermittent glitch in the TPS signal voltage. If you notice a glitch in the TPS sweep voltage, replace the TPS.
NOTE: Some TPS sensors require fine adjustment. If you aren't comfortable with using a DVOM (Digital Volt Ohm meter) to adjust the new TPS, then it's best to take the vehicle to a shop. If the voltage is not .45 volts (+or- .3 volts or so) with the throttle closed or if the reading is "stuck" then unplug the TPS connector. With KOEO check for 5 volts reference voltage present at the connector and a good ground. You can check the signal circuit for continuity by jumping a fused wire between the ground circuit of the TPS connector and the signal circuit. If the TPS reading on the scan tool now reads zero, then replace the TPS. However if that doesn't change the reading to zero, then check for an open or a short on the signal wire and if none is found, suspect a bad PCM. If manipulating the TPS wiring harness causes any change in idle, then suspect bad TPS.
Posted on Jul 13, 2011
P0020 Camshaft Position Actuator Circuit (Bank 2)
This sounds to me like a problem with the electrical connections in the multiplug sockets ,the previous problems were 3 yrs ago but check out that you do not have a siemans coumpter these are prone to weird and wonderfull faults .Normally once you start getting cam sensors and crank sensors then misfire 1/4 and so on this is a prelude to a faulty computer .
Posted on Apr 16, 2012
Nothing ever gets replaced, until you look up the
codes & then go to diagnostic charts for your vehicle
Then you component test the code items first
Codes have nothing to do with replacing anything
Study OBD2 Systems
Posted on May 22, 2012
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