Diagnostic Modes Description
The information provided in Modes 01 through 09 displays the various levels of emission related data that may be monitored, as well as the ability to retrieve and read stored DTC trouble codes , erase stored DTC trouble codes, generate readiness codes, and select the various PIDs and Test-IDs used within the modes to monitor the engine, and emission related component parameters.
The following table provides a link to all diagnostic modes that monitor all components and systems which influence the emission quality.
Note. Depending on scan tool and protocol used, the information displayed may be referred to by different names such as Test-ID (TID), Hex-ID, Component-ID (CID), On-Board Diagnostic Monitor Identifier (OBDMID), or contain no name at all and be referenced by only a number.
| Selectable diagnostic modes | |
|---|---|
| Mode 1: Obtain data --> Diagnostic Mode 01: Obtain data . | |
| Mode 2: Obtain operating conditions --> Diagnostic Mode 02: Obtain operating conditions . | |
| Mode 3: Interrogating fault memory --> Mode 03: Interrogating fault memory . | |
| Mode 4: Reset/delete diagnostic data --> Diagnostic Mode 04: Reset/delete diagnostic data . | |
| Mode 5: Obtain lambda test results --> Diagnostic Mode 05: Check lambda test results . | |
| Mode 6: Checking test results of components that are not continuously monitored --> Diagnostic Mode 06: Checking test results of components that are not continuously monitored . | |
| Mode 7: Checking test results of components that are continuously monitored --> Diagnostic Mode 07: Check test results of components that are continuously monitored . | |
| Mode 8: Tank leak test --> Diagnostic Mode 08: Tank leak test . | |
| Mode 9: Vehicle information --> Diagnostic Mode 09: Vehicle information . |
Readiness Code Description
Diagnostics are performed at regular intervals during normal vehicle operation. After repairing an emissions related system, a readiness code is generated by road testing the vehicle.
If a malfunction is recognized during the drive cycle, it will be stored in the DTC memory.
The OBD drive cycle operation will be monitored with a hand held diagnostic tool. Consult the manufacturers instruction manual for correct tool operation.
The readiness code is erased every time the DTC memory is erased or any time the battery is disconnected. If the DTC memory has been erased or the battery is disconnected, a new readiness code must be generated.
Only erase the DTC memory if a DTC has been stored.
General Recommendations
Most monitors will complete easier and quicker using a steady-foot and smooth acceleration during the drive cycle operation, cruise, and acceleration modes.
Operating Conditions
For the EVAP monitor test, the coolant temperature and the ambient air temperature must be between 10 ° C and 35 ° C with a difference between them no greater than 4 ° C. The ambient air temperature must not change more than 4 ° C during the drive cycle procedure (e.g. when driving out of a heated workshop in the winter).
Test requirements
- Erase the DTC memory --> «Diagnostic Mode 04: Reset/delete diagnostic data»(ref-255014-S10840575532007052300000) .
- Coolant temperature must be between 80 ° C - 110 ° C.
- The Intake Air Temperature (IAT) must be between 10 ° C - 35 ° C.
- Battery voltage must be a minimum of 12.5 volts.
- Fuel tank level 1/4 - 3/4 full.
| CAUTION | When performing the drive cycle operation, pay strict attention to driving conditions and please observe and obey all posted speed limits. Failure to follow these instructions may result in personal injury or possible death. |
Drive Cycle Procedure
- Connect the scan tool.
- Switch the ignition on and start the vehicle.
- Idle the vehicle for 2-3 minutes. This executes the O2S Heater, Misfire, Secondary AIR, Fuel Trim, and Purge system monitors.
- Drive the vehicle at 45-55 mph for a continuous 7 minute period, avoid stopping. This executes the EVAP, O2S, Fuel Trim, and Misfire monitors.
- Accelerate the vehicle to an engine speed of 5000 RPM (with automatic transmission use the tip-tronic mode); lift off the throttle until the engine speed is around 1200 rpm. This executes the fuel cut off
- Accelerate the vehicle smoothly to 60-65 mph, cruise constantly for 5 min, this executes the Catalyst; O2S, Misfire, Fuel Trim, and Purge System monitors.
- Decelerate and idle the vehicle again for 3 minutes. This executes the Misfire, Secondary AIR, Fuel Trim, and Purge system monitors.
- Check the status of the readiness code.
Note. Depending on the scan tool used. The readiness code status may be displayed as "complete, passed or OK."
- If any engine monitor fails the drive cycle test. Repeat the drive cycle test until all engine monitors have successfully run through and passed.
Note. When repeating the drive cycle operation for a failed EVAP monitor or thermostat-monitor, allow the engine to cool until the coolant temperature and the ambient air temperature are between 10 ° C and 35 ° C with a difference between them (coolant and ambient air) no greater than 4 ° C. Repeat the drive cycle operation.
If the drive cycle operation fails again.
- Check the DTC memory for stored DTCs --> «Mode 03: Interrogating fault memory»(ref-255014-S31889401162007052300000) .
Repair the vehicle if necessary.
- Repeat the drive cycle operation until all engine monitors have successfully run through and passed.
- Remove the scan tool and switch the ignition off.
End of operation