Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Diagnostic Mode 01 - Read Current System Data
Diagnostic Mode 01 makes it possible to access current emissions-related measured values and diagnostic data. The original measured values (no replacement values), input and output data and system status information are displayed using Diagnostic Mode 1.
Test Requirement
- Coolant temperature at least 80 °C.
Procedure
-- Connect the scan tool.
-- Start the engine and run at idle.
-- Select "Diagnostic Mode 1: Obtain data.".
-- From the following table, select the desired the "PID" that is to be monitored, e.g. "PID $05 Coolant temperature".
The current values of the component or system that is being monitored will be displayed on the scan tool screen.
| PID | Component or System |
|---|---|
| $01 | Monitor Status Since DTC's Cleared |
| $04: | Calculated Load Value |
| $05: | Engine Coolant Temperature |
| $0C: | Engine RPM |
| $0D: | Vehicle Speed |
| $10: | Air Flow Rate |
| $13: | Location of Oxygen Sensor |
| $1C | OBD Status of Vehicle |
| $1F: | Time Elapsed Since Engine Start |
| $21: | Distance driven with MIL ON |
| $24 | Bank 1 Sensor 1 (wide Range O2S) |
| $25 | Bank 1 Sensor 2 (wide Range O2S) |
| $30: | Number of Warm Up Cycles Since Fault Memory Cleared |
| $31: | Distance Traveled After Fault Memory Cleared |
| $33: | Barometric Pressure |
| $3C: | Catalyst Temperature Bank 1 Sensor 1 |
| $3E: | Catalyst Temperature Bank 1 Sensor 2 |
| $41: | Monitor Status this drive cycle (Diesel) |
| $42: | Engine Control Module System Voltage |
| $46: | Ambient Temperature |
| $49: | Absolute Pedal Position |
| $4A: | Redundant Absolute Pedal Position |
| $4C: | Commanded Throttle Motor Position |
| $4F: | External Test Equipment Configuration Information #1 |
| $5D: | Fuel Injection Timing |
| $5E: | Engine Fuel Rate |
| $61: | Driver Demand - Engine Torque Percent |
| $62: | Actual Engine Torque Percent |
| $63: | Engine Reference Torque |
| $65: | Auxiliary Inputs/Outputs |
| $67: | Engine Coolant Temperature |
| $69: | Commanded EGR and EGR Error |
| $6D: | Fuel Pressure Control System |
| $70: | Boost Pressure Control |
| $71: | Variable Geometry Turbo (VGT) Control |
| $73: | Exhaust Pressure |
| $77: | Charge Air Cooler Temperature |
| $78: | Exhaust Gas Temperature (EGT) Bank 1 |
| $7A: | Diesel Particulate Filter (DPF) Bank 1 |
| $7F: | Engine Run Time |
| $81: | Total engine run time for AECD |
-- Switch the ignition Off.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
No obligation. See pricing before you book.