Isuzu 4hl1-1 Ecu Pinout Extra Quality -

Never insert probes into the front of the ECU connector (terminal side). You will spread the pins, causing intermittent contact. Instead, use or a breakout harness.

Signals the ECU to wake up when the key is turned. isuzu 4hl1-1 ecu pinout

| Pin # | Signal Name | Signal Description | | --- | --- | --- | | 1 | BATT+ | Battery Positive | | 2 | BATT- | Battery Negative | | 3 | IGN | Ignition Switch | | 4 | ST | Starter Signal | | 5 | ENG OIL PRESS | Engine Oil Pressure Sensor | | 6 | COOLANT TEMP | Coolant Temperature Sensor | | 7 | FUEL TEMP | Fuel Temperature Sensor | | 8 | INTAKE AIR TEMP | Intake Air Temperature Sensor | | 9 | THROTTLE POS | Throttle Position Sensor | | 10 | VEHICLE SPEED | Vehicle Speed Sensor | | 11 | CRANK POS | Crankshaft Position Sensor | | 12 | CAM POS | Camshaft Position Sensor | | ... | ... | ... | Never insert probes into the front of the

Provides circuit diagrams specifically for the 4HL1 engine control system. Signals the ECU to wake up when the key is turned

Controls the common rail system, including the Supply Control Valve (SCV) and fuel injectors.

The ECU uses these pins to determine engine timing and fuel requirements.