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1997 Mitsubishi Pajero Questions & Answers
What does code 78 apps main and 79 tps main refer to , it is showing in Mitsubishi pajero 1997 model
Code 78 APPS Main and Code 79 TPS Main are diagnostic trouble codes (DTCs) that can appear on a 1997 Mitsubishi Pajero.
Code 78 APPS Main: This code indicates that the APPS (Air Pump System) Main relay is not working properly. The APPS relay is responsible for supplying power to the air pump, which is used to control the air-fuel mixture.
Code 79 TPS Main: This code indicates that the TPS (Throttle Position Sensor) Main circuit is not working properly. The TPS sensor is responsible for sending information to the engine control unit (ECU) about the position of the throttle valve.
If either of these codes appears, it is important to have the vehicle diagnosed by a qualified mechanic to determine the cause of the problem. The mechanic may need to test the APPS relay, the TPS sensor, or other components in the fuel system.
Here are some possible causes of Code 78 APPS Main and Code 79 TPS Main:
Faulty APPS relay: The APPS relay may be faulty and not be supplying power to the air pump properly.
Faulty TPS sensor: The TPS sensor may be faulty and not be sending accurate information to the ECU about the position of the throttle valve.
Clogged air filter: A clogged air filter can restrict airflow to the engine and cause the APPS relay to overheat and malfunction.
Low fuel pressure: Low fuel pressure can cause the APPS relay to overheat and malfunction.
Faulty wiring: The wiring to the APPS relay or TPS sensor may be damaged or corroded, causing the codes to appear.
If you are experiencing problems with your 1997 Mitsubishi Pajero and either Code 78 APPS Main or Code 79 TPS Main appears, it is important to have the vehicle diagnosed by a qualified mechanic to determine the cause of the problem and to get it repaired as soon as possible.
1997 pajero 4WD transmission making
just check on the front differential there is the actuation 4WD valve which is operated by means of vacuum. See whether you do have any vacuum leak,broken vacuum hose,or if the actuator itself does not work.
What have i done wrong/
If you removed the timing cover, you also removed the serpentine/accessory drive belt(s), and probably idler or tensioner pulleys. Make sure they are reinstalled properly. If the engine is hard to turn over, it may be because one of the pulleys is binding. Try removing the drive belt and see if the engine turns over more easily. If so, check to see which pulley is binding.
Idle 1800 rpm.
Test/check your ISC, make sure you have no vacuum leaks, reset the base idle screw, test/check your throttle position sensor.
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