Mac Tools Et97 User Manual -

The ET97 is designed for simplicity and professional field use.

Automatically selects the appropriate range for measurements.

: Displays the status of emission monitors to determine if a vehicle is ready for smog inspection.

: Selecting this option displays a list of fault codes with detailed descriptions. Fault Analysis Mac tools et97 user Manual

: Allows technicians to view real-time sensor, switch, and relay inputs while the engine is running to pinpoint intermittent issues. Vehicle Information

Because the ET97 features a digital display, it excels at finding high resistance in circuits. If you probe a 12V wire and the screen reads significantly lower (e.g., 9.5V), you are dealing with a voltage drop. This usually indicates a corroded wire, a loose terminal, or a failing switch. A traditional bulb-style test light would still light up on 9.5V, making this digital tool far more accurate. 🔧 Maintenance, Care, and Storage

If the meter fails to read current (Amperage), the internal fuse has likely blown. The ET97 is designed for simplicity and professional

The ET97 typically operates as a multi-functional tester. Key technical procedures outlined in manuals for similar Mac Tools diagnostic devices include:

Use the keypad to select "Read Codes" or "Diagnostics." If a "Communication Error" appears, verify the cable connection and ensure the vehicle is OBD II compliant.

Wiggle the cord near the base of the handle and near the ground clip. If the display flickers, the copper inside the cord is fractured. The cord will need to be repaired or replaced. : Selecting this option displays a list of

Touch the probe tip to the wire or metal component you suspect is a ground source.

: Plug the ET97 into the vehicle's OBDII diagnostic port (typically found under the dashboard).