Verifying Repairs/Completing a Trip
VERIFYING REPAIRS / COMPLETING A TRIP PARAMETERSGeneral
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.
The Volvo Scan Tool as a Verification Tool
One can check the control module self diagnostic by using the Volvo Scan Tool (ST). Diagnostic Test Mode (DTM) contains a menu called Diagnostic test. This displays a status menu that shows whether certain engine control module (ECM) conditions have been fulfilled or not.
When verifying a repair check whether a TRIP has been completed or not.
TRIP = YES
All diagnostic functions have been carried out at least once during the same journey.
TRIP = NO
Not all diagnostic functions have been completed, a sub-menu displays those which have not been completed.
SUBSTITUTE TRIP
The control module has not completed all diagnostic functions because diagnostic trouble codes (DTCs) have prevented other diagnoses.
READINESS = YES
Two TRIPs need to have been completed one after the other for readiness to switch to YES.. Readiness is checked in the USA in the inspection/maintenance (l/M) test. Any diagnostic trouble codes (DTCs) can be read off with a Generic Scan Tool (ST). To pass the test readiness must be confirmed and no diagnostic trouble codes (DTCs) stored.
Erase Diagnostic Trouble Codes (DTC) or reset Long-Term Fuel Trim to reset readiness.
Completing a TRIP
Check all diagnostic functions as follows.
- If the engine control module (ECM) has been without power the engine should 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 being verified a flywheel adaption must be carried out before verification (see Design and Function, Misfire Diagnostic).
- The test should 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 idled.
- Engine coolant temperature (ECT) should not be above +25~C (77~F) 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 and drive according to the schedule, use the Diagnostic test menu in the Volvo Scan Tool (ST) to see when a TRIP has been completed.
Driving Schedule:
To complete a TRIP as fast as possible follow the special Driving Schedule shown below.
- Start Engine.
- Move Gear Selector to Drive.
- Accelerate Gently to 1,500 - 2,000 rpm.
- Drive for 5 minutes at 1,500 - 2,000 rpm.
- Idle Engine for 70 seconds.
- Drive Engaged, Air Conditioning OFF.
- Drive for 6 minutes at 1,500 - 2,000 rpm.
- Idle Engine for 40 seconds.
- Drive Engaged.
- Air Conditioning (A/C) OFF.
- Drive for 5 minutes at 1,500 - 2,000 rpm.