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 02 - Read Operating Conditions
When an emissions-related fault (pending DTC, visible in mode 07) is first detected, operating conditions are stored. Mode 02 makes it possible to access this freeze frame data as soon as this fault is shown in mode 03. Each control module only shows freeze frame data for one fault via mode 02. Therefore, there are two priority levels. If there is a malfunction with higher priority, the freeze frame data is overwritten.
-- Fault with higher priority: Misfire malfunction or fuel trim malfunction.
-- Fault with normal priority: All other emissions-related faults.
Depending on scan tool and protocol used, the information in diagnostic mode 02 may be referred to by different names such as Test-ID, Hex-ID, Component-ID, or On-Board Diagnostic Monitor Identifier (OBDMID).
Procedure
-- Connect the scan tool.
-- Start the engine and run at idle.
If the engine does not start, crank the engine using starter for at least 5 seconds, do not switch the ignition off afterward.
-- Select "Diagnostic Mode 2: Obtain operating conditions.".
-- From the following table, select the desired the "PID", e.g. "PID $05 Coolant temperature" that is to be monitored.
The current values of the component or system that is being monitored will be displayed on the scan tool screen.
| PID | Component or System |
|---|---|
| $02: | DTC which triggered Freeze Frame data |
| $04: | Calculated load value |
| $05: | Coolant temperature |
| $0B: | Manifold Absolute Pressure |
| $0C: | Engine RPM |
| $0D: | Vehicle speed |
| $0E: | Ignition timing advance for # 1 cylinder |
| $0F: | Intake Air Temperature |
| $10: | Air flow rate |
| $11: | Absolute Throttle Position |
| $1F: | Time since engine start |
| $23: | Fuel pressure |
| $2C: | Commanded EGR Position |
| $2D: | EGR error between Actual and Commanded |
| $33: | Barometric pressure |
| $42: | Engine Control Module system voltage |
| $46: | Ambient temperature |
| $49: | Absolute Pedal Position |
| $4A: | Redundant Absolute Pedal Position |
| $4C: | Commanded Throttle Motor Position |
| $5D: | Fuel Injection Timing |
| $5E: | Engine Fuel Rate |
| $51: | Type of fuel currently being used |
| $61: | Driver Demand - Engine Torque Percent |
| $62: | Actual Engine Torque Percent |
| $63: | Engine Reference Torque |
| $67: | Engine Coolant Temperature |
| $69: | Commanded EGR and EGR Error |
| $6B: | Exhaust gas recirculation temperature |
| $6D: | Fuel Pressure Control System |
| $70: | Boost Pressure Control |
| $71: | Variable Geometry Turbo (VGT) Control |
| $73: | Exhaust Pressure Sensor Bank 1 |
| $77: | Charge Air Cooler Temperature |
| $78: | Exhaust Gas Temperature (EGT) Bank 1 |
| $7A: | Diesel Particulate Filter (DPF) Bank 1 |
| $7F: | Engine Run Time |
| $8B: | Diesel after treatment status |
| $4C: | Commanded Throttle Motor Position |
-- Switch the ignition off.
NO RELATED
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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.