Vehicle Diagnosis; Preparation And Connections; Preparations; Connections - LAUNCH TECH X-431 IV User Manual

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3. Vehicle Diagnosis

3.1 Preparation and connections

3.1.1 Preparations

1. Conditions for Test
1). Turn on the vehicle.
2). The voltage of vehicle battery should be 9 - 37V. The rated voltage of the X-431IV is 12V.
3). The throttle should be in the closed position.
4). Ignition timing and idle speed should be within specification range, water and transmission oil
temperature is in normal working range (water temperature is 90 – 110°C and transmission oil
temperature is 50 – 80°C).
2. Location of the DLC on the vehicle
The location of DLC varies for different vehicle make.

3.1.2 Connections

Before diagnosing a vehicle, please make sure the following connections are properly made:
1. Open the CF card slot and plug the CF card into the slot firmly with "UP SIDE" facing up;
2. Connect one end of the diagnostic main cable to diagnostic port of X-431 IV (
to one end of the selected diagnostic connector (
3. Connect the other end of diagnostic connector to the vehicle's DLC (
4. Plug one end of the cigarette lighter cable into the cigarette lighter cable jack (
to the cigarette lighter socket (
Note: If the power supply on vehicle diagnostic socket is insufficient or the power pin is
damaged, you can get power from the following ways:
1. From cigarette lighter: insert one end of the cigarette lighter cable into the lighter socket in
vehicle and connect the other end to the power connector of X-431IV main cable.
2. From battery: clamp the two clips of battery cable on the positive and negative poles of
battery and insert another end of the cable into the power connector of X-431IV main cable.
).
) to obtain power.
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X-431IV English User's Manual
), and the other end
).
) and the other end