Test Driving Procedures

Page 7

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Volvo Bus Service and Maintenance Manual

Test driving procedures

Check the following:Power transmission
 Check that the gearbox works smoothly and quietly.
 Bus with G7 EGS transmission:
Check the EGS-system function according to below.
 Heating system, Ventilation, Air Conditioning
 Check the defroster, heater and air-conditioning fans.
 Miscellaneous
 Check doors, kneeling system, jackknifing (artic buses).

Upshift
at Fth
Engine speed r/min (rev/min)
 Allison
 MT 643MT 644/647MT 654 CR
1C-2C2200-23002100-22001900-2000
2C-3C2200-23002000-2100-
3C-3L2100-22001900-2050-
3L-4L-2000-2100-
2C-2L--1900-2000
2L-3L--2050-2200
3L-4L--2100-2200
4L-5L--2000-2200
Abbreviations
CTorque converter
LLockup
FthFull throttle
 
UpshiftZF HP 500 and 590ZF HP 600
 PthFthKDPthFthKD
1C-2C185018501850---
2C-2L*-19001900---
2L-3L200020002200---
3L-4L180020252200---
4L-5L180020502200---
Late prod.**
1C-2C170018502050175018502050
Sc-2L*-19001900*19001900
2L-3L165019002150185019002150
3L-4L165019002150165019002150
4L-5L160019002100155019002100
*During part throttle the lockup clutch is activated when gear-changing 2-3.
**In combination with engines THD 101, 102.
Abbreviations
CTorque converter
LLockup
PthPart throttle
FthFull throttle
KDKick-down

Make sure the engine cannot start with the automatic transmission in the "Drive" position. Listen for engine and transmission thumps.

Transmission G7 EGS, function check

During driving check that all gear positions function normally without abnormal delay.

After driving check/note any fault codes with the diagnostic function (see Section 4-43 Service Manual). After any faults have been put right, clear stored fault codes by keeping the diagnostic button pushed in while turning the starting key to the "Drive" position. Push in the diagnostic button. Code 13, one long and three short flashes on the indicator lamp, indicates a speed lower than 300 r/min or that the engine has stopped.

Depress the clutch pedal and hold it depressed while pushing in the diagnostic button. Code 11, one long and one short flash, shows that the sensor next to the clutch pedal is correctly adjusted. Start the engine, release the clutch pedal, push in the diagnostic button again. No fault code will register on the indicator lamp if the system is functioning correctly.

With the engine still running and the clutch pedal depressed, check that the gear lever engages smoothly without jamming and that the neutral position is correctly adjusted between 4th and 5th gear position.

Engage a gear, stop the engine. Check that the gearbox and gear lever are moved automatically to the neutral position.

With the feed current switch/starting key in the 0-position (inhibitor cylinder inactivated), move the gear lever to a gear position. Turn the feed switch/starting key to the Drive position and check that the inhibitor cylinder in the shift control automatically moves the gear lever to the neutral position.