Readiness Code, Generating
NOTE:
- In order to generate the readiness code, a "mixed city and highway" drive (short test) has to be taken. A "mixed city and highway" drive is understood as approx. 1-1/2 to 5 minutes at 80 - 100 km/h (50 - 63 mph) with manual transmission in 4th or 5th gear, or automatic transmission selector lever in "D" position, preferably in 4th gear.
- If a malfunction is recognized and stored by the engine control module during a "mixed city and highway" trip, and/or the Malfunction Indicator Lamp (MIL) is switched on, the brief test can be interrupted by the technician and the malfunction repaired according to the diagnostic trouble code.
- If the readiness code has to be generated, the DTC memory should be checked (no faults should be stored) and erased (readiness code will be reset) before taking the "mixed city and highway" trip.
Step 1: Preparation
- Start engine and let idle.
- Connect VAG 1551 or VAG 1552 scan tool, switch on printer and select address word 01.
- Check and erase DTC memory.
- No malfunctions may be stored. If necessary:
- Repair malfunctions.
- Erase DTC memory.
- Stop engine and start again.
- Test drive and, as a check, check and erase DTC memory again.
- After checking and erasing DTC memory, let engine run at idle again.
Step 2: System readiness checking and creating
- Select VAG 1551 "Read Measuring Value Block" function 08, display group 29 Read Measuring Value Block (Function 08)
Read measuring value block 29 ->
1 2 3 4
Display shows display fields 1 through 4. Specified values:
- Display field 1: 111_01_1 (readiness code)
- Display field 2: 00000000 (trip status display)
- Display field 3: 0
- Display field 4: 0
- Press -> button.
Indicated on display
Read measuring value block ->
Input display group number XXX
- Push buttons -0-, -0- and -1- to input display group number 001.
- Press -Q- button to confirm input.
Read measuring value block 1 ->
1 2 3 4
Display shows display fields 1 through 4.
- Check display fields 1 and 3:
NOTE ON DISPLAY FIELD 1:
If the displayed value is less than 70 °C, let the vehicle warm up until at least 70 °C coolant temperature is attained.
NOTE ON DISPLAY FIELD 3:
If the displayed value is greater than 48 (corresponds to an altitude of approx. 1800 m) a diagnosis of the exhaust return can not be conducted due to altitude. Setting the readiness code at this altitude is not possible.
If specified values are attained See Step 3
Step 3: Road test
In order to set the readiness code, a "mixed city and highway" drive is required. The necessary driving conditions for the test drive are listed in the following chart:
Speed Between 50 and 62mph
RPM 1800 - 2700 RPM
Manual: 5th gear
Automatic: Drive mode "4"
Drive Profile After attaining the specified speed (50-82 mph) implement & short deceleraton phase (approx. 5-8 seconds), then drive if possible at constant specified speed and RPM range
Drive Time Approx. 1-1/2 to 5 minutes (as long as necessary)
Step 4: Checking readiness code
- Select VAG 1551 "Read Measuring Value Block" function 08, display group 29 Read Measuring Value Block (Function 08)
Read measuring value block 29 ->
1 2 3 4
Display shows display fields 1 through 4. Specified values:
- Display field 1: 000_00_0 (readiness code)
- Display field 2: 111_01_1 (trip status display)
- Display field 3: 0
- Display field 4: 0
- Press -> button.
- Press buttons -0- and -6- to select "End Output" function 06, and press -Q- button to confirm input.
If, during regeneration of the readiness code, the trip status display is set to "1" but the corresponding readiness code display is not set to "0" the diagnosis was carried out but not recognized as OK by the ECM.
In this case, DTC memory should be checked for malfunctions and/or to carry out a selective diagnosis:
- For three way catalytic convertor diagnosis (bank 1 and bank 2), also check display groups 035, 036 and 044.
- For EVAP system leak diagnosis, also check display group 030.
- For heated oxygen sensor diagnosis, also check display groups 032, 033, 034, 041, 042 and 043.
- For oxygen sensor heating diagnosis, also check display group 040.
- For Exhaust Gas Recirculation (EGR) throughput diagnosis, also check display group 017.