Copyright © 1998 General Motors Corp. B–1
WTEC II ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL
APPENDIX B — CHECKING CLUTCH PRESSURES
Checking individual clutch pressures helps to determine if a transmission malfunction is due to a mechanical or an
electrical problem. Properly making these pressure checks requires transmission and vehicle (or test stand)
preparation, recording of data, and comparing recorded data against specifications provided. These instructions are
for all WT Series Transmissions.
NOTE: Check to see if there are diagnostic codes set which are related to the transmission difficulty you are
evaluating. Proceed to make mechanical preparations for checking clutch pressures after codes have
first been evaluated.
A. Transmission and Vehicle Preparation
1. Remove the plugs from the pressure tap locations where measurement is desired (refer to
Figure B–1).
Figure B–1. Clutch Pressure Check Points
2. Install hydraulic fittings suitable for attaching pressure gauges or transducers.
3. Connect pressure gauges or transducers. Pressure gauge set J 26417-A is available for this
purpose. See Table B–2 for pressure levels expected.
4. Check that engine speed can be monitored (Pro-Link
®
9000 diagnostic tool may be used for this
purpose).
5. Be sure that transmission sump fluid temperature can be measured. (Pro-Link
®
9000 diagnostic
tool may be used for this purpose.)
CAUTION:
Be sure that the hydraulic fittings have the same thread as the plugs removed
(
7
⁄
16-
20 UNF-2A). Also please note that these fittings must be straight thread, O-ring style.
Failure to do this will result in damage to the control module.
V01670
MAIN
MAIN
T-CASE
CONNECTOR
C7
MAIN
C2
C2
C4
C4
C1
C1
LU
LU
C3
MD/B 300/B 400 HD/B 500MD 3070PT TRANSFER CASE
FRONT VIEW
C6 (MD 3070PT ONLY)
C5
C5
C3
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