Volvo: Check Engine Light and computer reset, engine coolant temperature, engine control module ecm

Question
Hi,

I have a 1999 Volvo S70 AWD. I had some emissions repairs done for Massachusetts inspection. I drove the car over 70 miles (all in one day) to reset the computer. The system at the inspection station says it is still not reset. How long should it take? I've been told between 5 and 60 miles by different mechanics.

Thanks!

Answer
Charlie,
Verifying Repairs/Completing a Trip
VERIFYING REPAIRS

General
After carrying out repairs it may be necessary to check that the fault really has been remedied. One way of doing this is to check that the engine control module (ECM) has carried out a self diagnostic for the function/component that has been repaired, and that the diagnostic trouble code (DTC) has not recurred. Verifying repairs is only intended as an aid if uncertain whether the fault persists or not. If an obvious fault is detected during fault-tracing it is not necessary to verify the repair.

Completing a TRIP
Check all diagnostic functions as follows.
To complete a TRIP as fast as possible follow a special driving schedule.
If the engine control module (ECM) has been without power the engine must be started a few times before the test is carried out
If the car has been without power and misfire related diagnostic trouble codes (DTCs) are to be verified, a flywheel adaptation must be carried out before verification. See Misfire diagnostic , See: Description of On-Board Diagnostics\Diagnostic Functions\Misfire Diagnostics
The test must take place on a road with little traffic where it is possible to drive slowly and stop at the side of the road
The air conditioning (A/C) can be on when the engine is running at part load but must be switched off before the engine is run at idle speed
For all diagnostics to be carried out, the engine coolant temperature (ECT) should not be above 25°C when the engine is started before the test
Ensure that there are no diagnostic trouble codes (DTCs) stored in the system before carrying out verification
Start the engine. Drive according to driving schedule.

Driving schedule:
Start the engine
shift gear selector to drive
accelerate gently to 1500-2000 rpm
drive for 5 minutes at 1500-2000 rpm
run the engine at idle speed for 70 seconds drive engaged, air conditioning (A/C) off
drive for 6 minutes at 1500-2000 rpm
run the engine at idle speed for 40 seconds drive engaged, air conditioning (A/C) off
drive for 5 minutes at 1500-2000 rpm
run the engine at idle speed for 50 seconds
drive for 5 minutes at 1500-2000 rpm
Engine brake from 4000 rpm to approximately 1300 rpm a few times.
Note!    Do not use the accelerator pedal (AP) during engine braking.