Volkswagen 01M Transmission. Manual - part 9

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.

Technical Service Information

INDEX

Figure 1

Line Pressure

LINE PRESSURE CHECK

LINE PRESSURE SHOULD INDICATE 60psi. AT IDLE IN DRIVE

LINE PRESSURE WILL INCREASE TO BETWEEN 120-150psi. AND 

SHOULD CUT BACK TO 65-75 ON EACH SHIFT 

Technical Service Information

INDEX

Figure 2

N93-EV6

"MOD"

x

x

.040"

FIL

TER

SUMP

FROM K1/B1

SHIFT V

AL

VE

FROM MANUAL

V

AL

VE

FROM PUMP

OUTPUT

SOLENOID REG.

V

AL

VE

FROM MANUAL

V

AL

VE

BOOST

REG. V

AL

VE

x

x

.045"

.039"

.079"

MAIN

REG. V

AL

VE

.058"

.058"

.038"

.058"

"01M" N93-EV6 OPERA

TION

N93-EV6, WHEN MODULA

TING, STROKES THE BOOST 

REGULA

T

OR V

AL

VE AGAINST ITS SPRING, REDUCING THE 

AMOUNT OF BOOST PRESSURE ON THE SPRING SIDE OF THE 

MAIN REGULA

T

OR V

AL

VE.

.044”

Technical Service Information

INDEX

Figure 3

N

92

-EV5

"

O

N

*"

x

x

x

x

x

x

B1 APPL

Y

V

AL

VE

K1 CLUTCH

REG. V

AL

VE

.044"

.030"

FROM MANUAL

V

AL

VE

T

O K1/B1

SHIFT V

AL

VE

SOLENOID

FEED

X

B2-BRAKE

REG. V

AL

VE

FROM K1 CONTROL

V

AL

VE

FROM 2-3 TIMING

V

AL

VE

T

O 2-3 TIMING

V

AL

VE

T

O K3/MANUAL 1

LOCKING V

AL

VE

x

K3 CLUTCH

REG. V

AL

VE

.047"

K

2

 C

L

U

TCH

K

3

 C

L

U

TCH

.063"

"01M" OVERDRIVE RANGE 1st to 2nd GEAR TRANSITION

LEGEND

MAIN LINE PRESSURE

SOLENOID REG.PRESSURE

PUMP SUCTION

CONNECTED CIRCUIT

CONVERTER REG.PRESSURE

LUBE PRESSURE

K1 CLUTCH PREFILL (10psi.)

SOLENOID APPLICA

TION

N88-EV1

OFF

ON

OFF

OFF

MOD*

ON*

MOD* = MODULA

TING

* = ON BRIEFL

Y DURING THE

     ENGAGEMENT THEN OFF

ON

N89-EV2

N90-EV3

N91-EV4

N92-EV5

N93-EV6

N94-EV7

B1

 BRAK

E

K

1

 C

LU

TCH

B

2

 B

RAK

E

.057"

x

x

x

.048"

N92-EV5 IS "ON" WHEN 

THE GEAR CHANGE IS 

COMMANDED

SUMMAR

Y

: THIS CONNECTS LINE 

PRESSURE FROM THE MANUAL V

AL

VE 

T

O THE 1ST LAND OF THE B2 

REGULA

T

OR V

AL

VE CONTROLS THE 

APPL

Y RA

TE OF THE B2 CLUTCH

Technical Service Information

INDEX