After selecting Snapshot from the Test Mode menu, a lof Snapshot options will appear on the Tech 1 displ(figures 6-32 and 6-33). These options, explained beloallow you to select the conditions or circumstances thdefine data capture, storage, and retrieval. • FO: Any Code — This option causes a snapshot to trigger any time a Diagnostic… Read More »
After completing the OBD, you can enter the Tech 1’s “Test Mode.” This mode offers a variety of testing and data compilation options, as shown in figures 6-24 and 6-25. These options are described below. • FO: Data List — this option displays the data parameters for identified data pairs. • F1: Field Service —… Read More »
1. With the “Applications” screen visible (refer to figure 6-17), press the F0 key to enter powertrain diagnostics. 2. The next screen to display (figure 6-18) asks you to identify the vehicle model year. Do this by entering the vehicle model year’s last two digits. This information can be obtained from the vehicle identification number… Read More »
Use the following procedures to prepare the Tech 1 for use with the 6.5L EFI V8 diesel engine PCM. 1. Install the appropriate master cartridge in the bottom slot of the Tech 1 by squeezing the tabs on the cartridge and sliding it into the connector. Do not force the cartridge; it only fits one… Read More »
The Tech 1 consists of the following elements (figure 6-14): • A display screen where information and instructions can be read. The display area is 16 characters wide and accommodates a maximum 4 lines of text. • A keypad where information is entered. There are 16 keys • Slots for master and auxiliary cartridges •… Read More »
The PCM is continually monitoring and communicating with the different electronic systems of the vehicle. It monitors input data from sensors and uses this data to command solenoids, relays, switches, and indicator lamps. When the incoming data is within range and the PCM and output devices are functioning properly, the vehicle operates as it should.… Read More »
Three diagnostic approaches can be used to solve driveability problems: code-based diagnostics, symptom-based diagnostics, and system-based diagnostics. Each has a specific purpose and should only be undertaken as directed by the On-Board Diagnostic (OBD) check. Code-Based Diagnostics Code-based diagnostics centers around the Diagnostic Trouble Codes (DTCs) stored by the PCM. These codes are systematically numbered… Read More »
A diagnostic strategy (figure 6-12) is simply an organized process of elimination. It directs you to look for the simplest cause to a problem first, before undertaking more difficult and time-consuming procedures. A key element of a sound diagnostic strategy is the On-Board Diagnostic Check (figure 6-13).
Several other on-vehicle items aid in diagnostics. Data Link Connector (DLC) The Data Link Connector (DLC) is located under the left side of the instrument panel (figure 6-11). It is a twelve terminal connector wired to the PCM. By connecting a jumper wire between terminals “B” and “A” or connecting the Tech 1 adapter to… Read More »
Basic circuit testing tools such as a tachometer, a test light, and a by-pass jumper allow further circuit examination. JUMPER WIRES Jumper wires (figure 6-6) are simple, effective testing aids. They are used to complete a circuit by allowing current to “jump” across a suspected open or break. Thus, they are actually a test of… Read More »