Isuzu 4hl1 Ecu Pinout Link [best] Info

You're looking for a guide on the Isuzu 4HL1 ECU pinout. The 4HL1 is a diesel engine produced by Isuzu, commonly used in various applications such as trucks, buses, and industrial equipment.

Unfortunately, I couldn't find a publicly available, direct link to a comprehensive guide covering the Isuzu 4HL1 ECU pinout. However, I can provide you with some general information and potential resources that might help you find what you're looking for:

General Information:

  • The Isuzu 4HL1 engine is a 4-stroke, 4-cylinder, diesel engine with a displacement of 5.2 liters.
  • The ECU (Engine Control Unit) for the 4HL1 engine is typically a Bosch or Delphi unit, but this may vary depending on the specific application and region.

Resources:

  1. Isuzu Official Website: You can try visiting the official Isuzu website (www.isuzu.com) and searching for technical information or documentation related to the 4HL1 engine.
  2. Bosch or Delphi Websites: If you're looking for ECU-specific information, you can try visiting the websites of Bosch (www.bosch.com) or Delphi (www.delphi.com), as they are common ECU suppliers for Isuzu engines.
  3. Technical Forums and Communities: Websites like Diesel World, Truck Forum, or Reddit's DIY community may have threads or discussions related to the Isuzu 4HL1 engine and ECU pinout.
  4. Wiring Diagrams and Repair Manuals: You can try searching online marketplaces like eBay or Amazon for wiring diagrams or repair manuals specific to the Isuzu 4HL1 engine. These resources may contain ECU pinout information.
  5. Specialized Automotive Forums: Websites like AutoElectric, Automotive Technical Information Forum, or Heavy Duty Truck Forum might have sections dedicated to engine control units and wiring diagrams.

ECU Pinout:

  • A search for "Isuzu 4HL1 ECU pinout" or "Isuzu 4HL1 engine control unit wiring diagram" may yield some results, but be cautious when using unverified sources, as they may not be accurate.

If you're still having trouble finding a comprehensive guide, I recommend reaching out to:

  • Isuzu dealerships or authorized service centers
  • Automotive electricians or mechanics experienced with diesel engines
  • Online communities or forums focused on diesel engines or Isuzu vehicles

Keep in mind that ECU pinouts can vary depending on the specific engine application, model year, and region. Ensure you verify the information with a reliable source to avoid any potential damage to your engine or ECU.

Isuzu 4HL1 ECU Pinout: A Comprehensive Guide

The Isuzu 4HL1 engine is a popular diesel engine used in various Isuzu vehicles, known for its reliability and performance. The Engine Control Unit (ECU) plays a crucial role in managing the engine's functions, and understanding the ECU pinout is essential for troubleshooting, tuning, and modifying the engine. In this article, we will provide a detailed overview of the Isuzu 4HL1 ECU pinout, including the pinout diagram, connector information, and a brief explanation of each pin's function.

ECU Pinout Diagram:

The Isuzu 4HL1 ECU pinout diagram is shown below:

| Pin # | Pin Name | Description | | --- | --- | --- | | 1 | BATT+ | Battery Positive | | 2 | IG_SW | Ignition Switch | | 3 | E_GND | Engine Ground | | 4 | Sensor GND | Sensor Ground | | 5 | CKP Sensor | Crankshaft Position Sensor | | 6 | CMP Sensor | Camshaft Position Sensor | | 7 | ECT Sensor | Engine Coolant Temperature Sensor | | 8 | IAT Sensor | Intake Air Temperature Sensor | | 9 | MAF Sensor | Mass Airflow Sensor | | 10 | TPS Sensor | Throttle Position Sensor | | 11 | Fuel Pump Relay | Fuel Pump Relay Control | | 12 | Injector 1 | Fuel Injector 1 Control | | 13 | Injector 2 | Fuel Injector 2 Control | | 14 | Injector 3 | Fuel Injector 3 Control | | 15 | Injector 4 | Fuel Injector 4 Control | | 16 | EGR Valve | Exhaust Gas Recirculation Valve Control | | 17 | Turbo Boost Sensor | Turbo Boost Pressure Sensor | | 18 | Wastegate Solenoid | Wastegate Solenoid Control | | 19 | Fuel Pressure Sensor | Fuel Pressure Sensor | | 20 | Oil Pressure Sensor | Engine Oil Pressure Sensor |

Connector Information:

The Isuzu 4HL1 ECU has several connectors that need to be identified before accessing the pinout:

  • Connector A: 20-pin connector ( ECU connector)
  • Connector B: 10-pin connector (Injector and Fuel Pump Relay connector)
  • Connector C: 6-pin connector (Sensor connector)

Pinout Explanation:

Here's a brief explanation of each pin's function:

  • Power and Ground: Pins 1 (BATT+), 3 (E_GND), and 4 (Sensor GND) provide power and ground to the ECU.
  • Sensors: Pins 5-10 connect to various engine sensors:
    • CKP Sensor (Pin 5): Crankshaft position sensor
    • CMP Sensor (Pin 6): Camshaft position sensor
    • ECT Sensor (Pin 7): Engine coolant temperature sensor
    • IAT Sensor (Pin 8): Intake air temperature sensor
    • MAF Sensor (Pin 9): Mass airflow sensor
    • TPS Sensor (Pin 10): Throttle position sensor
  • Fuel Injectors: Pins 12-15 control the fuel injectors:
    • Injector 1 (Pin 12): Fuel injector 1 control
    • Injector 2 (Pin 13): Fuel injector 2 control
    • Injector 3 (Pin 14): Fuel injector 3 control
    • Injector 4 (Pin 15): Fuel injector 4 control
  • Fuel Pump and EGR: Pins 11 and 16 control the fuel pump relay and EGR valve:
    • Fuel Pump Relay (Pin 11): Fuel pump relay control
    • EGR Valve (Pin 16): Exhaust gas recirculation valve control
  • Turbo and Fuel Pressure: Pins 17-19 connect to turbo and fuel pressure sensors:
    • Turbo Boost Sensor (Pin 17): Turbo boost pressure sensor
    • Wastegate Solenoid (Pin 18): Wastegate solenoid control
    • Fuel Pressure Sensor (Pin 19): Fuel pressure sensor
  • Oil Pressure: Pin 20 connects to the engine oil pressure sensor:
    • Oil Pressure Sensor (Pin 20): Engine oil pressure sensor

Link to ECU Pinout Diagram:

For a more detailed and visual representation of the Isuzu 4HL1 ECU pinout, you can refer to the following resources:

  • Isuzu 4HL1 Engine Workshop Manual (PDF)
  • Isuzu 4HL1 ECU Pinout Diagram (Image)
  • Online forums and communities (e.g., Diesel Engine forums, Isuzu enthusiast groups)

Conclusion:

Understanding the Isuzu 4HL1 ECU pinout is essential for troubleshooting, tuning, and modifying the engine. This article provides a comprehensive guide to the ECU pinout, including the pinout diagram, connector information, and a brief explanation of each pin's function. If you're planning to perform DIY repairs, tuning, or modifications, make sure to consult the ECU pinout diagram and relevant resources to ensure accurate and safe work.

For the Isuzu 4HL1 engine, the comprehensive ECU pinout and wiring data is primarily found in the official Workshop Manual (727 N-Series) . This engine often utilizes a Transtron ECU

, which features a complex multi-pin configuration (typically a large 96-pin chassis-side socket and a smaller 60-pin engine-side socket). Direct Access Links

The most reliable complete guides are hosted on specialized technical document platforms: Complete 4HL1 Workshop Manual : A 267-page guide covering the entire Engine Control System ECM/VIM Circuit Diagram : Specific Circuit Schematics for the 4HL1

showing connections between the ECM and vehicle interface module. Functional Inspection Guide : A deep dive into Fuel Injection and Sensor Wiring for the 4HL1. Key Pin Functions & Common Issues

Diagnostic data indicates several critical pins to monitor when troubleshooting: Suction Control Valve (SCV) : Control pins are known failure points where shorts to ground can occur. Power & Ground

: The manual details specific color-coded wires (e.g., Black/White for starter signals) across connectors like : Dedicated pins for the Boost Pressure Rail Pressure Coolant Temperature (THW) signals are standard across this ECU family. service-engine.com.ua Reference Values for Troubleshooting Isuzu 4HL1 Engine Control Manual | PDF | Hypertext - Scribd

Isuzu 4HL1 ECU pinout and full wiring diagrams are primarily found in the

Workshop Manual (N Series) Engine Control System (4HL1 Engine) Manual & Pinout Links isuzu 4hl1 ecu pinout link

Detailed technical pinouts for the 4HL1 engine control module (ECM) can be accessed via these specialized technical document repositories: Full Engine Control Manual: Isuzu 4HL1 Workshop Manual

on Scribd contains the complete Section 1A, covering the engine control system, diagnostics, and full wiring schematics. Circuit Diagrams:

For specific circuit diagrams showing the interface between the ECM, Vehicle Interface Module (VIM), and starter, refer to Page 26 of the 4HL1 Workshop Manual General ECU Pinout Reference:

While similar to the 4HK1, specific 4HL1 pin assignments for components like the SCV (Suction Control Valve), injectors, and various sensors are listed in these technical guides. Key Connector Pin Assignments (Sample)

While the full pinout contains dozens of pins across multiple connectors, key engine-side signals typically include: Common Rail Controls:

SCV (Suction Control Valve) High/Low controls and Fuel Rail Pressure (FRP) sensor inputs. Timing & Sync:

CKP (Crankshaft Position) Sensor High/Low and Cylinder Identification signals. Power & Ground:

Main relay power supply, ECM signal grounds, and case grounds. Drive-by-Wire:

APP (Accelerator Pedal Position) sensor inputs and idle-up sensor signals. Safety Note: For 4HL1 engine models, do disconnect the battery cable within

of turning off the ignition switch, as this may cause the ECM to malfunction. for a sensor or finding a troubleshooting procedure for a particular fault code?

Isuzu 4HK1 ECU Pinout Diagram | PDF | Fuel Injection - Scribd

Isuzu 4HL1 ECU Pinout Link: A Comprehensive Guide

The Isuzu 4HL1 engine is a popular diesel engine used in various applications, including trucks, buses, and construction equipment. The Engine Control Unit (ECU) plays a crucial role in the engine's performance, and understanding the ECU pinout is essential for troubleshooting, tuning, and modifying the engine. In this article, we will provide a comprehensive guide on the Isuzu 4HL1 ECU pinout link, including the ECU connector pinout, wiring diagram, and troubleshooting tips.

Introduction to Isuzu 4HL1 ECU

The Isuzu 4HL1 ECU is a sophisticated computer system that controls the engine's functions, including fuel injection, ignition timing, and emissions control. The ECU receives input from various sensors, such as the crankshaft position sensor, camshaft position sensor, and oxygen sensor, to calculate the optimal engine performance. The ECU also communicates with other vehicle systems, such as the transmission control unit and the instrument cluster.

Isuzu 4HL1 ECU Pinout Link

The Isuzu 4HL1 ECU pinout link refers to the connection between the ECU and the engine's wiring harness. The ECU connector is usually a 35-pin or 45-pin connector, depending on the engine model and year. The pinout link is critical for connecting the ECU to the engine's sensors, actuators, and other systems.

ECU Connector Pinout

The following is a general overview of the Isuzu 4HL1 ECU connector pinout:

  • 35-pin ECU connector:
    • Pin 1: Battery voltage (B+)
    • Pin 2: Ground (GND)
    • Pin 3: Crankshaft position sensor (CKP)
    • Pin 4: Camshaft position sensor (CMP)
    • Pin 5: Oxygen sensor (O2)
    • Pin 6: Fuel injector control (INJ)
    • Pin 7: Ignition coil control (IGN)
    • Pin 8: Fuel pump control (FP)
    • Pin 9: Transmission control unit (TCU)
    • Pin 10: Instrument cluster (IC)
    • Pin 11-35: Various sensor and actuator connections
  • 45-pin ECU connector:
    • Pin 1-10: Similar to the 35-pin connector
    • Pin 11: Exhaust gas recirculation (EGR) valve control
    • Pin 12: Variable geometry turbocharger (VGT) control
    • Pin 13: Fuel pressure sensor (FP)
    • Pin 14: Oil pressure sensor (OP)
    • Pin 15: Coolant temperature sensor (ECT)
    • Pin 16-45: Various sensor and actuator connections

Wiring Diagram

The wiring diagram for the Isuzu 4HL1 ECU is complex and varies depending on the engine model and year. However, the following is a general overview of the wiring diagram:

  • Sensor connections:
    • Crankshaft position sensor: ECU pin 3 (CKP) to sensor pin 1
    • Camshaft position sensor: ECU pin 4 (CMP) to sensor pin 1
    • Oxygen sensor: ECU pin 5 (O2) to sensor pin 1
  • Actuator connections:
    • Fuel injector: ECU pin 6 (INJ) to injector pin 1
    • Ignition coil: ECU pin 7 (IGN) to coil pin 1
    • Fuel pump: ECU pin 8 (FP) to pump pin 1

Troubleshooting Tips

Understanding the Isuzu 4HL1 ECU pinout link is essential for troubleshooting engine problems. Here are some tips:

  • Check the ECU connector: Ensure the ECU connector is clean and secure.
  • Verify sensor and actuator connections: Check the wiring diagram to ensure correct connections.
  • Use a scan tool: Use a scan tool to monitor engine performance and detect any trouble codes.
  • Consult the repair manual: Consult the repair manual for specific troubleshooting procedures.

Tuning and Modifying the Isuzu 4HL1 ECU

The Isuzu 4HL1 ECU can be tuned and modified to improve engine performance. However, this requires a deep understanding of the ECU pinout link and the engine's wiring diagram. Here are some tips:

  • Use a tuning tool: Use a tuning tool, such as a laptop with a tuning software, to modify the ECU settings.
  • Consult a professional: Consult a professional tuner or mechanic to ensure safe and effective modifications.
  • Monitor engine performance: Monitor engine performance after modifications to ensure optimal performance and reliability.

Conclusion

The Isuzu 4HL1 ECU pinout link is a critical component of the engine's performance and reliability. Understanding the ECU connector pinout, wiring diagram, and troubleshooting tips is essential for mechanics, technicians, and enthusiasts. By following this comprehensive guide, you can ensure safe and effective troubleshooting, tuning, and modifying of the Isuzu 4HL1 ECU. You're looking for a guide on the Isuzu 4HL1 ECU pinout

Additional Resources

For more information on the Isuzu 4HL1 ECU pinout link, consult the following resources:

  • Isuzu repair manual: Consult the official Isuzu repair manual for specific information on the ECU pinout link and wiring diagram.
  • Online forums: Join online forums, such as diesel engine forums or Isuzu enthusiast forums, to connect with other mechanics, technicians, and enthusiasts.
  • Tuning software: Use tuning software, such as laptop-based tuning tools, to modify the ECU settings and monitor engine performance.

By following this guide and consulting additional resources, you can ensure optimal performance and reliability of your Isuzu 4HL1 engine.

Report: Isuzu 4HL1 ECU Pinout

Introduction

The Isuzu 4HL1 engine is a diesel engine used in various Isuzu vehicles. The Engine Control Unit (ECU) is a crucial component of the engine management system, responsible for controlling fuel injection, ignition timing, and other engine functions. Understanding the ECU pinout is essential for troubleshooting, modifying, or upgrading the engine management system. This report provides an overview of the Isuzu 4HL1 ECU pinout.

ECU Pinout Overview

The Isuzu 4HL1 ECU pinout is a 154-pin connector, which is divided into several sections:

  1. Power and Ground
    • Pin 1: Battery positive (+B)
    • Pin 2: Ignition switch (IG)
    • Pin 3: Ground (GND)
  2. Sensor Inputs
    • Pin 10: Engine speed sensor (ESS)
    • Pin 12: Crankshaft position sensor (CKP)
    • Pin 14: Camshaft position sensor (CMP)
    • Pin 16: Coolant temperature sensor (ECT)
    • Pin 18: Intake air temperature sensor (IAT)
    • Pin 20: Fuel pressure sensor (FP)
  3. Actuator Outputs
    • Pin 30: Fuel injector 1 (INJ1)
    • Pin 32: Fuel injector 2 (INJ2)
    • Pin 34: Fuel injector 3 (INJ3)
    • Pin 36: Fuel injector 4 (INJ4)
    • Pin 40: Glow relay (GLOW)
  4. Communication and Miscellaneous
    • Pin 50: CAN bus high (CAN_H)
    • Pin 51: CAN bus low (CAN_L)
    • Pin 60: Diagnostic connector ( DLC)

Detailed Pinout

Here is a detailed list of the Isuzu 4HL1 ECU pinout:

| Pin | Signal Name | Description | | --- | --- | --- | | 1 | +B | Battery positive | | 2 | IG | Ignition switch | | 3 | GND | Ground | | 10 | ESS | Engine speed sensor | | 12 | CKP | Crankshaft position sensor | | 14 | CMP | Camshaft position sensor | | 16 | ECT | Coolant temperature sensor | | 18 | IAT | Intake air temperature sensor | | 20 | FP | Fuel pressure sensor | | 30 | INJ1 | Fuel injector 1 | | 32 | INJ2 | Fuel injector 2 | | 34 | INJ3 | Fuel injector 3 | | 36 | INJ4 | Fuel injector 4 | | 40 | GLOW | Glow relay | | 50 | CAN_H | CAN bus high | | 51 | CAN_L | CAN bus low | | 60 | DLC | Diagnostic connector |

Conclusion

The Isuzu 4HL1 ECU pinout is a complex system that requires a thorough understanding of the engine management system. This report provides a general overview of the ECU pinout, including power and ground, sensor inputs, actuator outputs, and communication and miscellaneous pins. For more detailed information, consult the Isuzu factory service manual or contact a qualified automotive technician.

References

  • Isuzu factory service manual
  • Isuzu 4HL1 engine manual
  • Online forums and discussion groups

Disclaimer

The information provided in this report is for general information purposes only. It is not intended to be a substitute for professional advice or guidance. Before attempting to diagnose or repair any issues with the Isuzu 4HL1 ECU, consult a qualified automotive technician or the Isuzu factory service manual.

The rain in Chiba Prefecture didn’t wash the grime away; it just made the asphalt slick and the cold seep deeper into the bones. Kenji stood under the tarpaulin stretched between his workshop and the chain-link fence, staring at the lifeless hulk of an Isuzu Elf.

It was a 2004 model, fitted with the 4HL1 engine—a robust, four-cylinder workhorse that usually took a beating and kept on ticking. But this one was dead. It had been towed in after stalling on the Tomei Expressway, and for three days, Kenji had been chasing a ghost.

"No compression issues, fuel pump is priming, crank sensor is new," Kenji muttered, wiping grease from his forehead with the back of a hand. "You're just not firing."

The owner, a frantic logistics manager, needed the truck running by morning. "It's the computer," he had insisted. "Just replace the ECU."

Kenji scoffed. A new Engine Control Unit for a 4HL1 was expensive, and swapping it without diagnosis was lazy mechanics. But he was running out of options. He had the scope out, checking voltages, but the readings were erratic. He suspected a break in the harness, likely somewhere deep in the loom where the insulation had rubbed away against the chassis. To find it, he needed the map—the Holy Grail of automotive diagnostics for this specific model.

He needed the pinout.

In the old days, he had thick paper manuals. Now, everything was behind paywalls or scattered across dead forums on the internet. He pulled his phone from his pocket, his thumb leaving a smudge on the screen. He typed the ritual incantation into the search bar: Isuzu 4HL1 ECU pinout link.

The first page was garbage—dead links, sketchy file-sharing sites asking for credit cards, and forums where the images had long since expired. He felt the familiar tighten of frustration in his chest. The rain drummed harder on the roof.

He refreshed the search. A result near the bottom caught his eye—a thread on a Russian truck forum from 2012. It was a simple text post, almost lost in the digital noise.

“For the 4HL1 Hitachi ECU, see attached. Saved my Elf.”

Kenji tapped the link. A PDF began to download. 2MB. 4MB. Complete. The Isuzu 4HL1 engine is a 4-stroke, 4-cylinder,

He opened the file. It was a grainy scan of a technical schematic, showing the 96-pin connector layout. It was ugly, but it was the truth.

"Okay," Kenji whispered. "Let's see what you're hiding."

He grabbed his multimeter and a long, sharp probe. He went back to the truck. The ECU was located behind the glove box, a black box with three large multi-colored plugs. He didn't need to remove it; he needed to back-probe the wires while the ignition was on.

He looked at the PDF on his phone, zooming in on the pin assignment. Pin 54: Main Relay Output. Pin 71: Engine RPM Sensor (+). Pin 12: Ground.

He started with the basics. He needed to check the continuity between the ECU pin and the injector solenoids.

"Pin 1, 2, 3... Injector #1," he counted, tracing the wire on the paper, then finding the corresponding slot on the plug. He slid the probe in. He checked the ground. Continuity. He checked the power supply. 12 Volts. Good.

Then he moved to the crank signal. According to the pinout he had just downloaded, the signal wire was light blue, pin 34. He cranked the engine. The multimeter should have oscillated between 0 and 5 volts. It stayed flat.

"Found you," Kenji grinned.

He checked the wire at the sensor itself. It was pulsing perfectly. The sensor was working. But at the ECU? Nothing.

He followed the harness from the engine bay into the cabin. Near the firewall, tucked behind a mess of aftermarket alarm wires installed by a previous owner, he saw it. A spliced wire, crudely twisted together with electrical tape that had lost its adhesive.

The light blue wire—the crank signal wire—had corroded right at the splice. The ECU was blind. It didn't know the engine was turning over, so it didn't fire the injectors.

Kenji didn't need a new ECU. He needed a crimp connector and five minutes.

He cut out the rot, stripped the fresh copper, and crimped a new butt connector. He wrapped it in proper amalgamating tape. He double-checked the schematic one last time, ensuring he hadn't mixed up the crank signal with the cam signal.

"Let's try this," he said, dropping into the driver's seat.

He turned the key. The glow plug light flashed and extinguished. He turned the ignition to start.

The starter whirred, and almost instantly, the 4HL1 roared to life. It coughed once, a puff of white smoke cleared, and then it settled into a steady, rhythmic idle. The vibration of the diesel engine shook the raindrops off the side mirrors.

Kenji sat back, exhaling a breath he felt like he’d been holding for three days. He looked at his phone, the screen dimming in the evening light. The PDF was still open.

He bookmarked the page. He didn't need a hard drive full of stolen software or a dealership subscription. He just needed that one link, that one piece of data from a stranger a decade ago, to bridge the gap between a pile of scrap metal and a working truck.

The logistics manager would be happy. The rain kept falling, but inside the cab, it was warm, and the engine was humming a song of victory. Kenji patted the dashboard. "Good truck," he said. "Good truck."

4. CAN communication fails

Check continuity on pins 47 & 48. Resistance between them with key off should be 60 ohms (termination resistors in ECU and truck side).

Q1: I found a pinout link for a 4HK1. Will it work?

No. The 4HK1 uses a different DENSO ECU (EDC17 vs EDC16). The injector driver pins are reversed. Connecting a 4HL1 harness to a 4HK1 pinout will blow the ECU power transistor.

The Ultimate Guide to the Isuzu 4HL1 ECU Pinout: Links, Diagrams, and Diagnostic Secrets

If you are a heavy-duty diesel mechanic, a fleet manager, or an owner-operator running an Isuzu NPR, NQR, or NRR truck with the legendary 4HL1 engine, you have likely found yourself staring at a wiring loom, a multimeter in hand, cursing a no-start condition or an intermittent sensor fault.

The keyword saving your sanity is the "Isuzu 4HL1 ECU Pinout Link."

But here is the hard truth: Isuzu does not freely distribute its proprietary ECU pinout data. Finding a reliable, accurate link to the 4HL1’s ECU pinout is akin to finding a blueprint for a bank vault. This article serves as your master key. We will provide a descriptive analysis of the pinout, explain where to find the official link, and teach you how to interpret the data without frying a $2,000 ECU.

Visualizing the 4HL1 ECU Connectors

The 4HL1 ECU uses two main connectors (A and B). Some variants have a third (C) for body builder interfaces.

  • Connector A (44 pins): Engine sensors (Crank, Cam, MAP, IAT, Coolant, Oil pressure).
  • Connector B (48 pins): Actuators (Injectors, EGR, Fuel pump, Glow plugs, Fan clutch).
  • Connector C (optional, 12 pins): Vehicle interface (Stop lamp, A/C request, Tachometer output).

In the typical pinout link or diagram, you will view the connectors from the wire harness side (back-probing), not the ECU side.

✅ 4. BBA-Reman / ECU testing guides

Some ECU rebuilders publish connector pinouts for testing. Example:
🔗 https://www.bba-reman.com/gb/content/isuzu_4hl1_ecu_pinout

Q2: My diagnostic tool won't link to the ECU. Is that a pinout problem?

Yes. Check Pin B-40 (CAN Low) and B-41 (CAN High). You must measure 60 ohms between these two pins at the DLC (Data Link Connector). If you see 120 ohms, one terminating resistor is missing. If you see 0 ohms, the CAN bus is shorted.

Common FAQs About the 4HL1 ECU Pinout Link