![]() There are any dead spots or it is not smooth, it probably needs to be The change should be increasing and smooth. Hooked (terminal C) up and the ignition on, move the TPS arm down and back up Replace the TPS and adjust the new one properly. If you cannot adjust the TPS to get that voltage, you'll have to If not, you'll have to adjust the TPS to get that ![]() If you see that voltage, your TPSĪnd wiring should be ok. You should notice approximately 0.8 volts. (positive) and B (Ground) with the ignition on and the throttle plate closed. If you see aboutĥ volts, hook up the connector again. Pins B (Ground) and A (5.0 volt supply) with the ignition on. Test, disconnect the connector at the TPS. Located on the right side of the front of the throttle body. Located on throttle body facing toward radiator. Here's a video of a YJ owner testing his MAP sensor. The ECUĬomputes that information and adjusts the air-fuel mixture accordingly. > What does it do? Compares ambient barometric pressureĭuring start-up (cranking) to engine load while engine is running. Voltage there should be 5 volts + or - 0.5 volts (Terminal A is the ground Supply voltage can be checked at terminal C with the ignition on. The voltage should drop to 1.5 - 2.1 volts with a HOT, neutral idleĮngine. Voltmeter with the ignition on/engine off, voltage at terminal B should be 4 -ĥ volts. Located on driver side of firewall just behind & above Manifold Absolute Pressure Sensor (MAP) MAP sensor. A short to ground would cause a 'no-resistance' faultĬausing the ECU to think the air temperature was extremely hot and lean out the The ECU to enrichen the fuel mixture because it thinks the temp is really cold ![]() When a manifold air temperature sensorįails (open circuit / no continuity) the high / infinite resisitance will cause Resistance of this sensor is read by the ECU which in turn adjusts the air/fuel (The hotter the air in the intake manifold - the lower the resistance.) The The same thing as the CTS, but based off incoming air temperature. Installed in the top of the intake manifold. Relocated MAT sensor shown on Rusty's air INFINITE resistance indicates an 'open / broken circuit. can be the sensor but will usually be a wire where the insulation has been NO resistance indicates a 'short' to ground Temperature and Manifold Air Temperature Sensor ResistanceĪpproximate resistance your meter should show at the Resistance chart for both Coolant Temperature Vehicles use a SEPARATE sensor located on the back half of the head, driver Unlike late HO engines RENIX engines do NOT have aĬombination coolant temperature sensor that also feeds the gauge! RENIX A short to ground would cause a 'no-resistance' fault causing theĮCU to think the coolant air temperature was extremely hot and lean out the The ECU then tells the injectors toĮnrichen the fuel mixture because it thinks the temp is really cold when it ![]() The max low temperature of -40 degrees F. When a coolant temperature sensor fails (open circuit / noĬontinuity) the high / infinite resisitance will cause the ECU to falsely read Sensor is read by the ECU which in turn adjusts the air/fuel ratio as close toġ4.7:1 as possible. (The hotter the coolant - the lower the resistance.) The resistance of the That the computer (ECU) uses to determine how much fuel the engine requires. Energizes the EGR valve solenoid toīasically - this sensor functions by providing a resistance-to-ground circuit Compensates for fuelĬondensation in intake manifold. Injector pulse widths and richer air-fuel mixtures). The injector pulse widths (Colder coolant temperatures result in longer (examples = 212* would be about 185 ohms, 160* would be about 450 ohms, 100* Resistance should be less than 1000 ohms with a WARM engine Coolant Temperature Sensor (CTS)Ĭoolant jacket on the driver's side of the block. If you need anything to beĬlarified, let me know. I had done all these in hopes to find andĮliminate the poor running I was experiencing. "Here's something I wrote up a while ago for someoneĭescribing tests for the sensors. Information collected and this page would not exist without it! Other tidbitsĪre added as they happen but the bulk of this page is Eric's work. THANK ERIC if this information helps ya as it was his effort that got this Has been edited to add my own photos and additional information. This information is provided with his permission and This information was provided by JabaThaHut and was also Of diagnostics for your early model 4.0L Jeep Cherokee with RENIX based This page contains information courtesy of Eric Giordano
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