General Information: Overview Suzuki XL7 I

Abbreviations and Meanings

ABBREVIATIONS AND MEANINGS

DTC Symptom Description - Vehicle Diagnostic Information

A DTC symptom is a 2-digit number which adds additional detail to a DTC. The DTC symptom provides additional information without requiring a large increase in the number of new DTCs.

Vehicle Identification Number

The Vehicle Identification Number (VIN) Derivative is located in one place on the engine and is a seventeen digit number stamped or laser etched onto the block at the vehicle assembly plant. If reading the identification number the following information can be obtained

Scheme 1

1. The first three digits identify the vehicle make.
2. The fourth digit is the vehicle line.
3. The fifth digit identifies the chassis type.
4. The sixth & seventh digits are the grade type.
5. The eight digit is the engine.
6. The ninth digit is a check digit.
7. The tenth digit is the model year.
8. The eleventh digit is the manufacturing plant.
9. The twelfth to seventeenth digits are the serial number.

The engine block is marked with the VIN on a pad area on the left rear side (1).

Engine Barcode Description

ENGINE BARCODE DESCRIPTION

Scheme 2

Circuit/System Description

Circuit/System Description identifies how a circuit/system normally functions.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

1. 5. Obtaining rotational speed for the components rotating at tire/wheel speed is critical to systematically eliminating specific vehicle component groups. These component rotational speeds can be generated by using the J 38792-VS Vibrate Software, or through calculating them manually.
2. 14. Be certain to OBSERVE for disturbances that match the customer's description FIRST, then look at the J 38792-A frequency which corresponds with that disturbance. Proper location of the J 38792-A Electronic Vibration Analyzer (EVA) 2, sensor onto the component which is most excited by the vibration disturbance is critical to obtaining an accurate frequency reading. This test will duplicate virtually any disturbance which occurs while the vehicle is in motion.
3. 17. Accelerate to a speed high enough above the speed of the disturbance to allow for the time needed to shift into NEUTRAL and for the engine to decrease in RPM to idle speed, before coasting down through the disturbance range.
4. 18. This test will either eliminate or confirm the engine as a contributing cause of the customer concern.

PROBLEM SYMPTOMS TABLE

Electronic Vibration Analyzer (EVA) Description and Operation

Special Tool

J 38792-A Electronic Vibration Analyzer

The J 38792-A, electronic vibration analyzer (EVA), is a 12-volt powered hand-held device, similar to a scan tool, which receives input from an attached vibration sensor or accelerometer and displays the most dominate input frequency(ies) (up to three) on its liquid crystal display. The vibration concern frequency(ies) are obtained through the use of the J 38792-A while following the Vibration Analysis Diagnostic Tables. The frequency(ies) obtained, when applied to the Vibration Analysis Diagnostic Tables, are used as a primary input to help determine the source of the vibration concern.

Vibrate Software Description and Operation

The J 38792-VS, Vibrate Software, is a computer software program which is designed to be used in support of the Vibration Analysis diagnostic tables, along with the J 38792-A, Electronic Vibration Analyzer (EVA) and a scan tool, to help in determining the source of a vibration concern. The J 38792-VS is designed to provide quick calculations and produce a table of the rotational speeds and frequency ranges for specific vehicle systems and components, based upon vehicle data parameters inputted by the user.

The J 38792-VS uses the vehicle data parameters, such as axle ratio, number of engine cylinders, etc. to create the base table, depicting the relationships of the various vehicle systems and/or components. The table view can be modified to show data related to vehicle speed only, engine speed only, or both vehicle speed and engine speed. The user can then plot the dominant frequency reading obtained on the J 38792-A which correlates with the vibration concern, and the engine RPM obtained on a scan tool which correlates with the concern. Once these pieces of data are correctly plotted, the table will point to the source of the vibration concern, which should confirm the results obtained through the following the Vibration Analysis diagnostic tables.

Scheme 3

The reed tachometer consists of 2 rows of reeds arranged side-by-side. Each reed is tuned to vibrate or resonate when it is excited by a specific frequency. The reeds are arranged by their specific resonant frequency, increasing from left to right, ranging from 10-80 Hz. This arrangement allows for a visual display of the most dominate frequencies which fall within this range.

The reed tachometer can be a helpful diagnostic tool, however it is extremely sensitive to external inputs that are not related to the vibration concern, such as rough road surfaces, etc., and it is difficult to master its use. Due to these conditions, the reed tachometer has limited diagnostic capability.

Due to the limited diagnostic capability, limited availability and increasing costs of the reed tachometer, it is NOT recommended as the primary tool to use in diagnosing a vibration concern.

When diagnosing a vibration concern, use the J 38792-A, electronic vibration analyzer (EVA). The J 38792-A has been designed to overcome the shortcomings to the reed tachometer. Refer to ELECTRONIC VIBRATION ANALYZER (EVA) DESCRIPTION AND OPERATION .