So yesterday on the way home the check engine light comes on. I read the codes through the odometer and it tells me the code is P0171. This morning I checked it again and then P0206 shows up as well and then about thirty minutes ago after about an hour drive to my house it also reads P0202. How should I diagnose this and fix these issues. The fact that two of the injector codes popped up after the P0171 tells me that might be the reason why and I am worried that the rest of the injectors will throw codes and I won't be able to drive it to home and college.3
fighterkit
I would do the P020x codes first.
a noid light would make quick work of the tests here, flashing, on steady, no light at all.
Might want to check injector connector at thise cylinders, old loose corroded connectors can be replaced.
I would consider the P0171 o2 sensor a messenger and wait till injector circuit is repaired, will likely clear then .
a noid light would make quick work of the tests here, flashing, on steady, no light at all.
Might want to check injector connector at thise cylinders, old loose corroded connectors can be replaced.
I would consider the P0171 o2 sensor a messenger and wait till injector circuit is repaired, will likely clear then .
Found this. It's a TSB on the 4.7L V8.
Multiple injector circuit codes. MIL on, no noticeable driveability problems. May have code P0121 - TPS voltage does not agree with MAP. Possible codes P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208
System:
Emissions/PCM/Fuel
Codes:
P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208
Problem:
The PCM software falsely sets injector circuit codes when there is really no problem with the injectors. The problem is voltage spikes from the Throttle Position Sensor.
Test & Fix:
Throttle Position Sensor (TPS) voltage spikes greater than 0.02 volts trigger these false codes. Theoretically, this could be caused by an intermittent ground or other wiring connection. However in actual practice it is almost always a problem with the TPS itself. Due to the nature of this problem there is no conclusive way to test the TPS or the TPS circuit. If there are multiple injector circuit codes with no misfire, replace the TPS and clear the codes.
Multiple injector circuit codes. MIL on, no noticeable driveability problems. May have code P0121 - TPS voltage does not agree with MAP. Possible codes P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208
System:
Emissions/PCM/Fuel
Codes:
P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208
Problem:
The PCM software falsely sets injector circuit codes when there is really no problem with the injectors. The problem is voltage spikes from the Throttle Position Sensor.
Test & Fix:
Throttle Position Sensor (TPS) voltage spikes greater than 0.02 volts trigger these false codes. Theoretically, this could be caused by an intermittent ground or other wiring connection. However in actual practice it is almost always a problem with the TPS itself. Due to the nature of this problem there is no conclusive way to test the TPS or the TPS circuit. If there are multiple injector circuit codes with no misfire, replace the TPS and clear the codes.
engine running injectors FLASH the noid light.
Interesting TSB, Has me asking is the airbag light on? A common WJ condition. I do nt see the p0121 code but a TPS voltage ck would make sense checking the voltage range.
Interesting TSB, Has me asking is the airbag light on? A common WJ condition. I do nt see the p0121 code but a TPS voltage ck would make sense checking the voltage range.
What year is this WJ ?
neither of the other mentioned codes (TSB) and as jeep has been operating a few years now, my thoughts are the TPS cost vs labor to scope for voltage (a old part) - seams Replacing makes sense unless you have a scanner already can see live data.
neither of the other mentioned codes (TSB) and as jeep has been operating a few years now, my thoughts are the TPS cost vs labor to scope for voltage (a old part) - seams Replacing makes sense unless you have a scanner already can see live data.
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