Toyota 89452-28030 Sensor, Throttle Position

All the mentioned components are covered by an extended warranty mandated by the federations; therefore, it is impossible to check or replace any of the, while still under warranty; but after the warranty expires, all with the exception of the oxygen sensor and the ECU can be checked and replaced. To inspect the EFI main relay, in engine compartment fuse panel, switch on the ignition key light, and if it has clicking sound, then relay operates fine, otherwise its resistance has to be measured. For models that were produced between 1979 and 1981 make sure there is continuity between the terminals and check the resistance; for the later models the continuity should exist and use battery voltage to check for operation. The circuit opening relay of the compressor is located in a different position in various models of the car, its operation should be examined fist and then the resistance measurement. The resistance of solenoid resistor should be the one recommended by manufacture for specific model. Most coolant temperature sensors have less resistance as the temperature rises; therefore, if the resistance does not change, replace the sensor. When it comes to the fuel cut RPM checks, the procedures vary according to the model year and involve bridging terminals and checking RPM. Continuity and resistance must be tested on the fuel pump relay and the resistor and the high temperature line pressure-up system must check whether the vacuum switching valve is operational with the right amount of resistance. The High Altitude Compensation System's sensor shall make resistance measurement, and the EGR gas temperature sensor shall be checked in hot water. The functionality of the oxygen sensor can be determined by methods such as voltage and deflections and the methods differs with the model year. It will only be appropriate to check the sub-oxygen sensor when a certain code is on while the throttle position sensor needs to be bench checked and might even need to have its continuity altered. Cam position sensor is for turbo only; ECU should be replaced only if faulty according to a dealer, and there is a detailed method on how to remove and install it.

The coolant temperature sensor is a thermistor whose resistance rises when temperature drops or falls when temperature rises; a failure noticed by Code 22 often results from a faulty connection or a new thermistor is needed. To test this particular sensor kindly submit the sensor and pull out the connectors then measure the resistance across the terminals, this should read 2000-3000 ohms when the sensor is cold and 200-400 ohms when the sensor is warmed up, tests can also be conducted on heated water. If resistance is correct, then check if you have approximately 5 volts of reference voltage with the ignition turned on. For replacement, the connector should be disconnected and the screws on the sensor removed and new threads on the sensor can be covered with Teflon when fixing. The oxygen sensor, either single or dual-stage, listens to the exhaust gas and outputs a voltage, the ECM then uses this to maintain the AFM and try to achieve an ideal ratio of 14.7 parts air to 1 part fuel for emissions compliance. They mandate appropriate working conditions such as electrical conduction, availability of clean air, and desirable temperature, and the usage of unleaded gasoline. To check its operation, observe the output millivolt signal during the operation and verify that the signal constantly changes in the range from 0.1 to 0.9 volts, with the engine warming up. If any problems occur, then it is necessary to measure the post-catalytic converter sensor and the heater to confirm if there is good supply voltage. Here, there is detachment of battery cable, lifting of car and slow unscrewing of the sensor, use of anti-seize compound on the threaded portion before screwing the sensor back. TPS to control the flow of fuel depending on the position of the throttle and Airflow which is an electrical engine sensor that measures the volume of air that is coming in, with certain resistance which are coded based on the model year of the vehicle. The Intake Air Temperature (IAT) sensor which is inside the airflow sensor changes the voltage relaying to the temperature of the air, and problems lead to code 24. The EGR temperature sensor, which is located close to the EGR valve, controls the turn-on of EGR based on exhaust temperature; failure is signaled by Code 71. The Voltage Speed Sensor, abbreviated VSS, sends a voltage signal to the ECM for speed a prompt, and the problems arising from them cause Code 42. In Nissan cars, the knock sensor detects detonation and alters timing based on this feature; trouble related to it is noted as Code 52. To check the knock sensor, one has to pull out the intake manifold, and continuity tests confirm proper operation. Crankshaft position sensor is situated below the timing chain cover, it sends crankshaft position to the ECM, checks with the help of the resistance tests and its removal is relatively simple.