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.

AUTOMATIC TRANSMISSION SERVICE GROUP

Technical Service Information

Copyright © 2001 ATSG

WWW.ALL-TRANS.BY

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

AUTOMATIC TRANSMISSION SERVICE GROUP

Technical Service Information

Copyright © 2001 ATSG

WWW.ALL-TRANS.BY

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”

AUTOMATIC TRANSMISSION SERVICE GROUP

Technical Service Information

Copyright © 2001 ATSG

WWW.ALL-TRANS.BY

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

AUTOMATIC TRANSMISSION SERVICE GROUP

Technical Service Information

Copyright © 2001 ATSG

WWW.ALL-TRANS.BY

INDEX