Questions on Automotive Competency

Attempt to answer the following questions to gauge your knowledge on the general aspects of  automotive repair etc..  (some of the questions are tricky, hence you need to read carefully )

1. Which sensor output is the engine rpm of the car ?

     a. Coolant Temperature Sensor
     b. Wheel Speed sensor
     c. Oxygen sensor
     d. Crank Angle sensor

Simple short circuit test

The diagram on the left is a very simple and effective way of checking for short circuits in most vehicles but the battery terminal must be disconnected.

Unless you are checking for proper ground of this wire i.e. it is a ground wire, a positive swing of the multimeter indicating continuity means that the wire is somewhere grounded in its path before reaching to another component or point in the electrical path.

Do not use this test on wires which are unknown to you as it could damage sensitive electronic components.

Mit Throttle and Ign Timing Service

Start the Car
Warm it up
Ground the Ign timing adj terminal (brown colour) with jumper wire.
Scanner to check the TPS value for (mV) and (%) opening and record it down.
Use scanner to check idle rpm of 750±50. If ok, skip below para.

If cannot achieve the above rpm, clean the throttle body as follows:
Remove air cleaner. (remove ign timing adj jumper wire if you have earlier connected it)
Plugged the air bypass hole at the bottom.... .....