Question about 1991 Nissan 300ZX

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What would cause the transmision wiring harness to be melted by the exhaust?

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Exhaust get's very hot, might be missing the heat shield, to protect the harness.

Posted on Aug 23, 2010

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Wires are melted and exposed at fuel pump relay and code flashes for mass air flow sensor . car starts but idle is very rough and lopes


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Hi-Failed inspection at Motor Vehicle Code PO160 (2001 Nissan Maxima). Car runs fine- no dash lights on. Left Rear Oxygen Sensor? Cost to fix or rigg it? Must get this car passed. Thanks in advance,...


CausesPotential causes of an P0160 code include:
  • Holes in exhaust near post cat o2 sensor
  • Bad Bank 2, position 2, o2 sensor
  • Wiring problem, melted harness, broken connectors, etc.
  • Bad PCM
Possible SolutionsIt's always best to do a visual inspection of the exhaust system first. Look for holes near o2 sensors or wiring harnesses coming in contact with exhaust components. Repair as necessary.
1. Start the engine and allow it to reach operating temperature. Using a scan tool, observe the Bank 2 position 2 o2 sensor. If it isn't moving at all this doesn't necessarily mean that anythings wrong. Post cat o2 sensors often switch very little. Increase the engine RPM to a fast idle and then recheck the sensor voltage reading. If it starts switching now, the sensor may be sluggish and/or intermittently going "dormant". Replacing the sensor at this point would be a good idea. Visually check the o2 sensor for contaminates, etc. If you suspect it's contaminated with coolant or oil, replace it. But, if it still isn't responding after increasing engine RPM, turn off the engine and unplug the 2/2 o2 sensor. With KOEO (key on engine off) check that there is 12 Volts battery voltage and a good ground to the o2 sensor heater element. If the heater element has no battery voltage it can cause the o2 sensor to be sluggish and not switch properly which can cause a P0160.
So, diagnose that problem first(there will usually be other codes present). If there is power and ground to the heater element check that the sensor ground is present. If it is, connect a jumper wire between the sensor ground and signal wire. Now the 2/2 o2 sensor reading should be low. If so, replace the Bank 2 position 2 o2 sensor. If, after connecting the jumper wire, the o2 sensor reading still remains "stuck", check for wiring problems, harness contacting exhaust components, or broken connectors. Repair as necessary. Then recheck. If you can find no wiring problems and the o2 sensor reading on the scan tool doesn't change after installing the jumper wire, recheck at the PCM connector. It may be necessary to clip the signal wire near the PCM in a location that will be easy to repair. If it now shows a low voltage reading, then you know beyond a doubt that there is a wiring problem. At this point clipping the offending wire out of the harness and running a new one may be your best bet. But If it still shows no change, the PCM may be at fault.

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I have a 2003 ford windstar and the wiper wire harness melted any ideas if the computer would cause this


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sounds like it was burning real rich if it melted the o3 sensor harness chances are the converter melted inside and is restrickting the exhaust if you unhook the exhaust at manifold and it runs replace converter and fid out what is making it run rich before you burn out new converter

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