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. These faults can be damaging to the catalyst system.
-- 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 (TID), Hex-ID, Component-ID (CID), 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 |
|---|---|---|
| $02: | DTC That Caused Required Freeze Frame Data Storage | A, B; Hexadecimal |
| $03: | Fuel system "A" status | A, byte 1 of 2 |
| - Fuel system "B" status | B, byte 2 of 2 | |
| $04: | Calculated Load Value | A, 100/255% |
| $05: | Engine Coolant Temperature | A, 1° C with -40° C offset |
| $06: | Short Term Fuel Trim Bank 1 | A, 100/128% (0% at 128) |
| $07: | Long Term Fuel Trim Bank 1 | A, 100/128% (0% at 128) |
| $0B: | Intake Manifold Absolute Pressure | A, 1 kPa |
| $0C: | Engine RPM | A, B; 0.25 rpm |
| $0D: | Vehicle Speed Sensor | 1 km/h |
| $0E: | Ignition Timing Advance For #1 Cylinder | A, 0.5° (0° at 128) |
| $0F: | Intake Air Temperature | A, 1° C with -40° C offset |
| $11: | Absolute Throttle Position | A, 100/255% |
| $1F: | Time Since Engine Start | 1 second per count |
| $2E: | Commanded Evaporate Purge | A, 100/255% |
| $2F: | Fuel Level Input | A, 100/255% |
| $33: | Barometric Pressure | A, 1 kPa |
| $42: | Control Module Voltage | A, B; 0.001 V |
| $43: | Absolute Load Value | A, B; 100/255% |
| $44: | Fuel/Air Commanded Equivalence Ratio | A, B; 0.0000305 |
| $45: | Relative Throttle Position | A, 100/255% |
| $46: | Ambient Air Temperature | A, 1° C with -40° C offset |
| $47: | Absolute Throttle Position B | A, 100/255% |
| $49: | Accelerator Pedal Position D | A, 100/255% |
| $4A: | Accelerator Pedal Position E | A, 100/255% |
| $4C: | Commanded Throttle Actuator Control | A, 100/255% |
| $51: | Type Of Fuel Currently Being Utilized By The Vehicle | A, byte 1 of 1 |
| $56: | Long Term Secondary O2 Sensor Fuel Trim Bank 1 | A, 100/128% (0% at 128) |
| $67: | Engine Coolant Temperature | |
| - Engine Coolant Temperature 1 | B, 1° C with -40° C offset | |
| - Engine Coolant Temperature 2 | C, 1° C with -40° C offset | |
| $6D: | Fuel Pressure Control System | |
| - Fuel Rail Pressure A | D, E; 1 kPa = 0.1450377 PSI | |
| $70: | Boost Pressure Control | |
| - Boost Pressure Sensor A | D, E; 0.03125 kPa | |
| $75: | Turbocharger A Temperature | |
| - Turbocharger A Compressor Outlet Temperature | C, 1° C with -40° C offset | |
| $77: | Charge Air Cooler Temperature (CACT) | |
| - Charge Air Cooler Temperature (CACT) Bank 1, Sensor 1 | B, 1° C with -40° C offset |
-- Switch the ignition off.