QuestionWhat is the driving procedure for resetting cleared computer modules in order to have smogged (1997 Volvo 850)?
AnswerGrieco,
1997 Volvo 850 L5-2.5L VIN 55 B5254S
Vehicle Level Powertrain Management Computers and Control Systems Testing and Inspection Testing and Inspection Procedures Monitors, Trips and/or Drive Cycle (Readiness Codes) Volvo Drive Cycle OBD II Readiness Codes: Revised Reset Instructions
Affected vehicles:
Vehicles equipped with Motronic 4.4 or Motronic 4.3 Engine Management System
OBD II Readiness Codes: Revised Reset Instructions
Background:
The MY 1996,1997 and 1998 Volvo 850/S70/V70/C70s require an extended driving period in order to reset readiness codes from INCOMPLETE to COMPLETE. When verifying an emission related repair, the TRIP identified in Section KKKK of the Engine Management System Service Manual TP 2308202 M 4.4 or Section EBU of the Engine Management System Service Manual TP 2301202 M 4.3 may not allow all of the diagnostic monitors to run.
The following instructions, which supersede TRIP instructions contained in the above referenced service manual, will exercise all of the diagnostic monitors on these models. As long as no diagnostic trouble codes have been stored, the readiness codes will be set to COMPLETE upon completion of two consecutive trips driven according to the instructions.
OBD II Readiness Codes: Revised Reset Instructions
Introduction 1
This on-road driving sequence will allow all of the diagnostic functions an opportunity to run. After two correct, consecutive TRIPS, the readiness codes should be set to COMPLETE, provided no diagnostic trouble codes have been stored.
General Instructions 2
No Diagnostic Trouble Codes (DTC) present in system.
Connect Volvo Systems Tester (VST). Enter the DIAGNOSTIC CHECK menu to verify if a trip has been completed refer to VST Screen Navigation for OBD II Trip and Flywheel Readiness.
M 4.4
Flywheel adaptation must be completed (status READY) TIP: Look in the Monitor Test Scroll List and find the entry "F ADAP." It will say either READY or NOT READY. If it says READY, continue. If it says NOT READY refer to setting the flywheel adaptive values to ready.
is set.M 4.3
In order to insure EVAP leakage detection completion, the fuel level in the car should be above 1/4 and below 3/4 tank.
Air conditioning (A/C) must be off during idle periods. A/C compressor activation during the Evap diagnostic may Interrupt the Evap test.
Select a suitable route where it is possible to safely stop at the side of the road. Obey all traffic regulations and posted speed limits.
Engine temperature at start must be between +29°C (84°F) +49°C (122°F). If engine temperature is below +29°C, start engine to warm up over +29°C and then shut off. Restart engine when coolant temperature is between +29°C-+49°C. TIP: The coolant temperature can be read out from the SCROLL LIST using the Volvo Systems Tester (VST).
Another confirmation that the ECU has seen the correct start criteria is to access the EFI code 112 in the DIAGNOSTIC CHECK menu. With ignition key in position 2, engine off, access the DIAGNOSTIC CHECK menu and press enter. The EFI codes will appear. Scroll down until you get to EFI 112.
Start engine, go directly from position 2 to position 3 do not cycle key. The EFI 112 status should then change from NOT TESTED to TESTED. This indicates that the ECU has seen the correct start criteria.
Trip Instructions 3
Start Engine
Accelerate gently to 1500 - 2000 rpm, manual gear box equipped, gear selection dependent on highway
Drive for 6 minutes at 1500 - 2000 rpm
Safely stop the car and idle engine for 70 seconds
[Fuel Trim adaptive functions are checked by the above steps.)
Accelerate gently to 1600 - 2000 rpm
Drive for 6 minutes at 1600 - 2000 rpm, manual gear box equipped, gear selection dependent on highway
Stop the car and idle engine for 70 seconds
[Secondary Air diagnosis should be carried out at this time (if equipped).]
Accelerate gently to at least 45 mph, drive for 5 minutes at 1800 - 2200 rpm, manual gear box equipped, gear selection dependent on highway
Top the car and idle engine for 60 seconds
[EVAP Leakage diagnosis should be carried out at this time]
Accelerate gently to at least 45 mph, drive for 4 minutes at 1800 - 2200 rpm, manual gear box equipped, gear selection dependent on highway
Stop the car and idle engine for 60 seconds
Accelerate gently to 1800 - 2200 mm
NOTE :
Repeat this last step 3-4 times. To set the cycle flag for idle air adaptation diagnosis the engine needs to come to idle 7 times. Under normal driving conditions you come idle 7 times very easily, but during the forced "TRIP" there are just 3 idle phases
STOP, DO NOT SHUT OFF ENGINE, trip completed move gear selector to neutral apply parking brake
Check that all diagnostic functions are completed, using Volvo Systems Tester (see below)
The diagnostic check will now say, "TRIP COMPLETED".
M 4.4 systems will also display either READINESS = YES or NO based on completion of 2 "TRIPS". M 4.3 systems will not display the READINESS code, but 2 complete "TRIPS" will set the READINESS code.
If all diagnostic functions are NOT completed there are ways to rerun portions of the trip, see the descriptions following.
STOP, DO NOT SHUT OFF ENGINE, trip completed move gear selector to neutral apply parking brake
Check that all diagnostic functions are completed, using Volvo Systems Tester (see below)
The diagnostic check will now say, "TRIP COMPLETED".
M 4.4 systems will also display either READINESS YES or NO based on completion of 2 "TRIPS". M 4.3 systems will not display the READINESS code, but 2 complete "TRIPS will set the READINESS code.
If all diagnostic functions are NOT completed there are ways to rerun portions of the trip, see the descriptions following.
Using the Volvo Systems tester, VST, you can determine if all diagnostic functions were completed. If any one or more were not tested you can rerun only that portion of the TRIP. To determine which diagnostic functions have not been completed, using the VST enter the DIAGNOSTIC CHECK menu. At the TRIP/READINESS window press enter. Here the EFI codes representing individual diagnostic functions will be displayed. Note the ones that are NOT TESTED. Below are the specifics on how you can address individual codes:
NOTE:
The VST does not continuously provide "online" updates. If you want to check the status of readiness before, during or after a drive cycle you must always exit the VST Diagnostic Test and re-enter.
EFI 233, Adaptive Idle Air trim. After completing the trip and seeing that this function is not set, idle the Engine for 60 seconds, press the accelerator and rev up the Engine above 1500 rpm for a few seconds, return to Idle for 60 seconds. Continue this until EFI 233 is completed.
EFI 425/436, Rear oxygen sensor, Accelerate to at least 45 mph, drive for 5 minutes at 1800 - 2200 rpm.
EFI 435, Front heated oxygen sensor, slow response. Drive the car with an Engine speed between approximately 2200 to 2800 rpm and a load between 1,1 to 1,8 ms (LOAD - TL).
Automatic gearbox equipped, use low gear it necessary.
drive for 2 minutes at 1800 - 2200 rpm, manual gear box equipped gear selection dependent on highway
accelerate directly to 3000-3500 rpm for 30 seconds, manual gear box equipped in third gear
reduce rpm to 1800 - 2200 for 2 minutes, manual gear box equipped in fifth gear
accelerate directly to 3000 - 3500 rpm for 30 seconds, manual gear box equipped in third gear
reduce rpm to 2300 - 2500 for 2 minutes, manual gear box equipped in forth gear
EFI 611/612, Fuel tank system. Run the quick test in VST for Leakage detection monitoring. (ACTIVATION->ACTIVATE DIAG->LEAKAGE DIAGNOSIS
EFI 442+445448,Pulsed Secondary Air Injection system, Run the Quick test in VST for the Pulsed Secondary Air system monitoring (ACTIVATION->ACTIVATE DIAG->SAS DIAGNOSIS)
Again: Please note that although the readiness codes may present as INCOMPLETE, this condition will not inhibit the OBD II system from monitoring, detecting, and subsequently storing a corresponding DTC in system memory.
