Equus 3022 Tester Manual Jun 2026

| Section | Content | Real-World Use | |---------|---------|----------------| | | Voltage limits, engine running warnings, connector handling. | Do not skip. OBD1 systems can carry 12V+ to pins you wouldn’t expect. | | 2. Tester Components | LED display, rotary dial, test leads (red/black clips), and jumper wire. | The jumper wire is the single most lost accessory. Manual shows how to substitute a paperclip. | | 3. Setting Up | Battery connection (9V internal for memory backup), ground clip placement. | Most “dead unit” complaints are because the black ground clip isn’t on chassis ground. | | 4. GM (General Motors) Testing | Jumping pins A & B on the ALDL (12-pin, later 12+4). Read codes via LED flashes or “Check Engine” light. | Engine light flashing: Code 12 (system OK) appears 3 times, then actual codes. | | 5. Ford (MCU, EEC-IV) | Using the self-test connector (STI) and jumper to STO. Two-digit and three-digit code lists. | You must watch both the tester’s LED and the vehicle’s check engine light simultaneously. | | 6. Chrysler | SCI (Serial Communication Interface) access via a single wire. | No jumper needed; just connect the tester’s single lead to the SCI pin. | | 7. Asian Imports (Toyota, Honda, Nissan) | Flash code retrieval via terminals TE1/E1 (Toyota) or SCS (Honda). | The manual’s pin diagrams here are worth the download alone. | | 8. O2 and EGR Tests | Using the multimeter-like function to measure voltage (0-1V for O2, 0-5V for EGR position). | Crucial for smog check pre-inspection. | | 9. Flash Code Library | 100+ codes for each manufacturer. | Code 33 on GM: MAP sensor high voltage. Code 41 on Ford: No HEGO switching. | | Appendix | Connector illustrations, fuse ratings, cleaning instructions. | The wiring diagram for the tester’s internal protection diode – helpful if you blow it. |

For most tests, connect the red lead to the positive (+) terminal and the black lead to the negative (-) terminal or a known good ground. 2. Measuring Battery and Alternator Voltage equus 3022 tester manual

Most people buy the 3022 just to pull codes. The manual tries to teach you how to use (Mode 6). While the 3022 screen is small (only 2 lines), you can scroll through Oxygen sensor voltages and Coolant temp. | Section | Content | Real-World Use |

Equus 3022 Analyzer is a specialized diagnostic tool designed for conventional and electronic ignition systems. It functions as a digital multimeter with added automotive-specific capabilities like measuring engine RPM and dwell angle. Key Technical Specifications The device features an auto power-off Manual shows how to substitute a paperclip

Attempting to use the Equus 3022 without the manual can blow a fuse in your vehicle’s diagnostic port or, in rare cases, damage the ECU.

Connect the leads to the battery. A healthy 12V battery should read between 12.4V and 12.7V .