Backprobing Electronic Connectors

Backprobing electronic connectors provide a useful means of diagnosing a probable open or short circuit in any situation. However backprobing must be done carefully so as not to cause a short circuit in itself hence creating more problems. This means a very sharp, long and thin probe is ideal in this situation. A good idea is to remove the inner body of an insulation piercing clip (photo) and connect the end via a banana clip to the DMM (digital multimeter).

Angle Torque Wrench

This is an Angle Torque Tool.
Make sure that the stop rod (black color L rod) is slightly shorter than the ext bar and socket as shown below. Otherwise the socket will not sit at the bottom of the cylinder head bolt properly.
The stop rod can be placed outside of the cylinder head wall for support or it could be placed inside whichever is convenient.
This tool is typically attached to a 9½ inch ext rod and a ratchet wrench of 200Nm or more of torque capability.

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.... .....