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 "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 | Data Byte |
|---|---|---|
| $00: | Supported PIDs $01 - $20 | |
| $02: | Freeze Frame DTC | |
| - DTC that caused required freeze frame data storage | A, B | |
| $03: | Fuel System Status | |
| - Fuel System "A" Status: | A | |
| $04: | Calculated Load Value | |
| - Calculated Load Value | A | |
| $05: | Engine Coolant Temperature | |
| - Engine Coolant Temperature | A | |
| $06: | Short Term Fuel Trim - Bank 1 | |
| - Short Term Fuel Trim - Bank 1 (Use If Only 1 Fuel Trim Value) | A | |
| $07: | Long Term Fuel Trim - Bank 1 | |
| - Long Term Fuel Trim - Bank 1 (Use If Only 1 Fuel Trim Value) | A | |
| $0C: | Engine RPM | |
| - Engine RPM | A, B | |
| $0D: | Vehicle Speed Sensor | |
| - Vehicle Speed Sensor | A | |
| $0E: | Ignition Timing Advance | |
| - Ignition Timing Advance For #1 Cylinder | A | |
| $11: | Absolute Throttle Position | |
| - Absolute Throttle Position | A | |
| $1F: | Time Since Engine Start | |
| - Time Since Engine Start | A, B | |
| $20: | Supported PIDs $21 - $40 | |
| $2E: | Commanded Evaporative Purge | |
| - Commanded Evaporative Purge | A | |
| $2F: | Fuel Level Input | |
| - Fuel Level Input | A | |
| $33: | Barometric Pressure | |
| - Barometric Pressure | A | |
| $40: | Supported PIDs $41 - $60 | |
| $42: | Control Module Voltage | |
| - Control Module Voltage | A, B | |
| $43: | Absolute Load Value | |
| - Absolute Load Value | A, B | |
| $44: | Fuel/Air Commanded Equivalence Ratio | |
| - Fuel/Air Commanded Equivalence Ratio | A, B | |
| $45: | Relative Throttle Position | |
| - Relative Throttle Position | A | |
| $46: | Ambient Air Temperature | |
| - Ambient Air Temperature | A | |
| $47: | Absolute Throttle Position B | |
| - Absolute Throttle Position B | A | |
| $49: | Accelerator Pedal Position D | |
| - Accelerator Pedal Position D | A | |
| $4A: | Accelerator Pedal Position E | |
| - Accelerator Pedal Position E | A | |
| $4C: | Commanded Throttle Actuator Control | |
| - Commanded Throttle Actuator Control | A | |
| $51: | Type Of Fuel Currently Being Utilized By The Internal Combustion Engine | |
| - Type Of Fuel Currently Being Utilized By The Vehicle | A | |
| - $01 | A | |
| $56: | Long Term Secondary O2 Sensor Fuel Trim - Bank 1 (Use If Only 1 Fuel Trim Value) | |
| - Long Term Secondary O2 Sensor Fuel Trim - Bank 1 (Use If Only 1 Fuel Trim Value) | A | |
| $60: | Supported PIDs $61 - $80 | |
| $67: | Engine Coolant Temperature | |
| - ECT Sensor 1 supported | A, Bit 0 | |
| - ECT Sensor 2 supported | A, Bit 1 | |
| - Engine Coolant Temperature 1 | B | |
| - Engine Coolant Temperature 2 | C | |
| $68: | Intake Air Temperature | |
| - IAT Bank 1, Sensor 1 supported | A, Bit 0 | |
| - Intake Air Temperature Bank 1, Sensor 1 | B | |
| $6D | Fuel Pressure Control System | |
| - Fuel Rail Pressure A supported | A, Bit 1 | |
| - Fuel Rail Pressure A | D, E | |
| $70: | Boost Pressure Control | |
| - Support Of Boost Pressure Control Data | A | |
| - Boost Pressure Sensor A supported | A, bit 1 | |
| - Boost Pressure Sensor A | D, E | |
| $77 | Charge Air Cooler Temperature | |
| - CACT Bank 1, Sensor 1 supported | A, bit 0 | |
| - Charge Air Cooler Temperature Bank 1, Sensor 1 | B | |
| $80 | Supported PIDs $81-$A0 | |
| $87 | Intake Manifold Absolute Pressure | |
| - Intake Manifold Absolute Pressure A supported | A, bit 0 | |
| - Intake Manifold Absolute Pressure A | B, C |
-- Switch the ignition off.