Bosch M797 Pinout Better Jun 2026

Lada Bosch M7.9.7 ECU Pinout Guide | PDF | Throttle - Scribd

| Pin Function | Signal Type | Testing Procedure | | :--- | :--- | :--- | | | Hall Effect / Inductive | Check for 5V reference or AC pulse during cranking. | | Throttle Position (TPS) | Variable Resistor | Check 5V reference and signal ground. Signal voltage should sweep smoothly 0.5V–4.5V. | | Intake Air Temp (IAT) | Thermistor | Resistance changes with temp. High resistance = Cold. | | Engine Coolant Temp (ECT) | Thermistor | Similar to IAT. Verify resistance against temp chart. | | Map Sensor | Analog Voltage | 5V Reference, Ground, and Signal. Signal changes with manifold vacuum. | bosch m797 pinout better

| Pin | Signal Description | I/O | | :-- | :----------------------------------------------------------------------------------------------- | :------- | | | Heated oxygen sensor (HO2S) heater control | Output | | 2 | Ignition coil control (cylinder 2) | Output | | 3 | Ignition coil ground | Ground | | 5 | Ignition coil control (cylinder 1) | Output | | 6 | Fuel injector control (cylinder 4 for 4-cyl) | Output | | 7 | Fuel injector control (cylinder 3 for 4-cyl) | Output | | 27 | Fuel injector control (cylinder 1) | Output | | 47 | Fuel injector control (cylinder 4) | Output | | 46 | Evaporative emission (EVAP) canister purge valve control | Output | | 64 | Idle air control (IAC) valve / stepper motor phase D | Output | | 65 | Idle air control (IAC) valve / stepper motor phase A | Output | | 66 | Idle air control (IAC) valve / stepper motor phase B | Output | | 67 | Idle air control (IAC) valve / stepper motor phase C | Output | | 69 | Fuel pump relay control | Output | | 70 | A/C compressor clutch relay control | Output | | 50 | Engine cooling fan relay control | Output | | 14 | Main relay control output | Output | Lada Bosch M7

To understand the M797 better, you must stop looking at it as a list of 134 loose wires. It is organized into functional clusters. | | Intake Air Temp (IAT) | Thermistor

The Engine Control Unit (ECU) is commonly found in vehicles like Lada, Kia, Hyundai, and Chery. Pinout configurations vary slightly by manufacturer, but the 81-pin connector follows a standard general architecture for core functions. Core Pinout Functions (81-Pin Connector)

The pinout is an invaluable diagnostic tool if the ECU is not booting.

| Pin | Wire Color (Typical) | Signal | Emergency Test | | :--- | :--- | :--- | :--- | | 1 | Red | Battery 12v | Check with test light (not meter) | | 11 | Black/Blue | Power Ground | Voltage drop test (<0.1v) | | 20 | Grey/Red | TPS Signal | Wiggle pedal; voltage must sweep smoothly | | 27 | Brown/White | Sensor Ground | Resistance to battery negative >10k Ohms? Bad relay. | | 29 | Green/Yellow | MAP | Blow into hose; voltage must change. | | 46 | Blue/Red | Inj 1 | "Noid" light must flash bright | | 26 | White/Red | K-Line | Scans at 10.4k baud only | | 6 | Black | Crank Sensor | 200mv AC while cranking | | 83 | Orange | 5v Reference | If missing, unplug all sensors. If it returns, one sensor is shorted. |