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: | Monitoring status since erasing DTC memory |
| $03: | Condition of fuel system |
| $04: | Calculated load value |
| $05: | Coolant temperature |
| $06: | Short term air fuel ratio |
| $07: | Long term air fuel ratio |
| $0C: | Engine RPM |
| $0D: | Vehicle speed |
| $0E: | Ignition timing advance for #1 cylinder |
| $0F: | Intake air temperature |
| $10: | Air flow rate from mass air flow sensor |
| $11: | Absolute throttle position |
| $12: | Secondary Air Injection |
| $13: | Oxygen Sensor Bank 1, Sensor 1 (LSU) |
| $13: | Oxygen Sensor Bank 1, Sensor 2 (LSF) |
| $13: | Oxygen Sensor Bank 1, Sensor 3 (SULEV) |
| $13: | Oxygen Sensor Bank 1, Sensor 4 |
| $15: | Oxygen Sensor Bank 1, Sensor 2 (LSF) |
| $16: | Oxygen Sensor Bank 1, Sensor 3 (SULEV) |
| $1C: | OBD requirements (OBD, OBDII, EOBD, No OBD) |
| $1F: | Time since engine start |
| $21: | Distance driven with MIL ON |
| $23: | Fuel rail pressure |
| $2E: | Commanded EVAP purge |
| $30: | Warm up counts after MIL erased |
| $31: | Distance driven after erasing DTC memory |
| $33: | Barometric pressure |
| $34: | Heater current Bank 1 Sensor 1 |
| $3C: | Calculated Catalyst Temperature Sensor 1 |
| $3E: | Calculated Catalyst Temperature Sensor 2 (SULEV) |
| $41: | Monitor status current drive cycle |
| $42: | Control module voltage |
| $43: | Absolute load value |
| $44: | Specified value of oxygen sensor signal |
| $45: | Relative throttle valve position |
| $46: | Ambient temperature |
| $47: | Throttle valve position 2 absolute |
| $49: | Accelerator pedal position 1 absolute |
| $4A: | Accelerator pedal position 2 absolute |
| $4C: | Specified throttle valve position |
| $56: | Offset oxygen sensor regulation after catalytic convertor |
-- Switch the ignition off.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra 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.