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 | Description |
|---|---|
| 01: | Number of malfunctions in Mode 3/MIL status/Readiness status |
| 03: | Condition of system 1 (Bank 1), (Bank 2) |
| 04: | Calculated load value |
| 05: | Coolant temperature |
| 06: | Oxygen sensor integrator bank 1 |
| 07: | Oxygen sensor adaptation value Bank 1 |
| 08: | Oxygen sensor integrator Bank 2 |
| 09: | Oxygen sensor adaptation value Bank 2 |
| 12: | Engine speed |
| 13: | Vehicle speed |
| 14: | Ignition angle cylinder 1 |
| 15: | Intake air temperature |
| 16: | Air mass |
| 17: | Absolute throttle valve position 1 |
| 19: | Location of oxygen sensor monitoring (constant oxygen sensors) |
| 21: | Oxygen sensor voltage Bank 1 Sensor 2 |
| 25: | Oxygen sensor voltage Bank 2 Sensor 2 |
| 28: | OBD requirements (only master ECM) |
| 31: | Time since engine start (must NOT be reset after erasing DTC memory with engine running) |
| 33: | Driven distance after MIL on |
| 35: | Fuel pressure (rail pressure) |
| 46: | Tank ventilation valve activation |
| 48: | No. of WUCs after erasing DTC memory |
| 49: | Distance driven after erasing DTC memory |
| 51: | Ambient pressure |
| 52: | Oxygen sensor actual value Bank 1 - Sensor 1 Oxygen sensor monitoring pump current Bank 1 - Sensor 1 |
| 56: | Oxygen sensor actual value Bank 2 - Sensor 1 Oxygen sensor monitoring pump current Bank 2 - Sensor 1 |
| 60: | Catalytic converter temp. Bank 1 - Sensor 1 |
| 61: | Catalytic converter temp. Bank 2 - Sensor 1 |
| 64: | Supported definition PIDs $41 through $60 |
| 65: | Monitor-Status in this driving cycle |
| 66: | System voltage control modules |
| 67: | Absolute load value |
| 68: | Oxygen sensor specified value |
| 69: | Relative throttle valve position |
| 70: | Ambient air temperature |
| 71: | Absolute throttle valve position. 2 (redundant) |
| 73: | Absolute accelerator pedal position 1 |
| 74: | Absolute accelerator pedal position (redundant) |
| 76: | Specified throttle valve position |
| 86: | Offset oxygen sensor control behind cat. Bank 1 |
| 88: | Offset oxygen sensor control behind cat. Bank 2 |
-- Switch the ignition off.
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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.
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