Copyright © 2002 ATSG "2003"  SEMINAR  INFORMATION Automatic Transmission Service Group SLIDE VOLKSWAGEN / AUDI UNCONTROLLABLE HARSH 1-2 UPSHIFT COMPLAINT: CAUSE: CORRECTION: Before or after overhaul, vehicles equipped with 01M, 01N and 01P transaxles, may exhibit a harsh 1-2 upshift along with firmer than normal engagements as well as firm upshifts to 3rd and 4th. The cause may be, 1. Erratic or high line pressure. 2. An electrical malfunction in the EV5 solenoid  electrical circuit. 3. A Hydraulic malfunction with EV5 solenoid. (NOTE:  The  EV5  solenoid  is  grounded  on  each  engagement  and  each  upshift  and downshift which helps control Clutch apply Pressure for smooth engagements as shown in Figures 3 and 4.) Connect a pressure gage to the line pressure port as shown in Figure 1. Line pressure should indicate 60 psi. in the Drive position at idle and should increase to 120-150 psi. at stall. Line pressure should cut back to between 65-75 psi. on each shift. If Line pressure does not cut back on each shift, or is at 120-150 psi. at all times, or is erratic on the gage, replace the EV6 solenoid and check the Boost Regulator and Main Regulator valve to ensure  they  are  not  stuck.  Refer  to  Figure  2  for  a  description  of  how  EV6  Solenoid   operates. Refer to Figure 5 and locate terminal 7 at harness connector. Back probe that terminal to verify that the computer is grounding EV5 during the 1-2 upshift. If the computer is not grounding that terminal, go to STEP A. If the Computer is grounding that terminal go to STEP B. STEP A. Connect a scan tool to the diagnostic connector and check to see if the TCM has set a trouble code 00266 (VAG) or a P0773 which are EV5 solenoid circuit faults. Repair the EV5 Solenoid circuit as needed. If the TCM has no trouble codes set and does not ground EV5 Solenoid during the 1-2 shift, the TCM may be faulty. STEP B. Go to Correction number 3. Remove EV5 Solenoid from its bore. Ensure that the B1 Apply valve, which is located below the solenoid, is not sticking in it’s bore. Air check EV5 solenoid and ensure it’s proper operation as shown in Figure 6. If EV5 Solenoid does not close consistently replace as needed. To correct this condition: 1. 2. 3.