![]() Coolant temp sensors wires are shorted to each other. This DTC indicates one of several things: Coolant temp sensors wires are shorted to Ground. This DTC tells you that the PCM is seeing a temperature reading above 250° F (121° C). I would like to point out that the fuel pump was replaced at the dealership on 12-14-2016 and shortly thereafter the gasket between the pump and the tank needed to be replaced because it was dripping fuel. P0117: Engine Coolant Temperature (ECT) Circuit Low Input. I turn the key off and turn it back on and it starts. When you work with the P0128 code, you might be tempted to get right in there and get the diagnostics done. After about 5 minutes, the fuel pressure drops (slower than the first time) but drops to about 44.25 PSI. Replace coolant temperature (ECT) sensor 150-300 Replace intake air temperature (IAT) sensor 75-150 Repair/replace wiring 50-1,500 Mechanics Tips about the P0128 Code. I went into a bookstore, came back to the car and put the key in the on position. I turn the key off and turn it back on and then the engine starts. In 2 - 3 minutes, the fuel pressure drops from about 53 PSI to 44 PSI. With the engine off, I notice that the "REL FUEL PSI" slowly dropping. I get the code reader out and I check the data. On a side note, the temperature was about 41F. and then I got in the car at about 10:15 p.m. This has happened before and as such you are better off bench testing an alternator and testing of the battery separately when the engine is not running. Lifting a terminal can cause a voltage spike and fry the PCM. SOURCE: 2000 ford crown victoria hello lipounds, the temp sensor located on the passenger side front of engine near the 1 injector. The battery these days is regulated in part by the resistance and value of the battery state. Similar set of issues also exist for lifting the battery terminals to "test" the alternator. Code readers though are not a panacea, and I have seen cases where good old trouble shooting is required with a multimeter or other tools to measure the condition of the engine or outputs. (26 Nm).' I even tried using my crowfoot, but its not a 12 point and was too wide to fit. For any of these systems however it is highly recommended to either verify with a thermometer independent of the temperature sensors, or get a code reader for reading the codes that may be stored. 'Using a 19 mm (0.74 in) 12 point crows foot, remove and discard the CHT sensor. ![]() The EGR/DPFE sensors if that is not working properly can also cause issues with running. The 4 main sensors are the O2 sensors closest two the heads, the MAF, the IAC, and the TPS sensor. However, there are more symptoms you should be aware of. Throwing the computer into default mode may help you to determine if something is mechanically wrong, but is NOT diagnostic for a bad MAF sensor. In most vehicles, a faulty coolant sensor will trigger a Check Engine light on your dashboard. This mode can destroy catalytic convertors in short order. Pulling the MAF will throw the computer into a default mode which will run rich.
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