WTEC II ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL
4–2 Copyright © 1998 General Motors Corp.
WIRE CHECK PROCEDURES
b. If the continuity check is good (0–2 Ohms resistance), remove the jumpers. Check the harness for
shorts between wires and shorts-to-ground by performing the following (refer to Figure 4–2):
(1) At the ECU end of the harness, touch one VOM probe to one wire of the circuit being tested
and touch the other probe to each terminal (in both connectors), then touch the probe to
chassis ground and to the transmission main housing. Do this for both wires in the circuit
being tested.
(2) If at any time the VOM shows zero to low resistance, or the meter’s continuity beeper sounds,
there is a short between the two points being probed — wire-to-wire or wire-to-ground.
Isolate and repair the short.
Figure 4–2. Short Between Wires And To Ground
4–2. CHECKING AT TRANSMISSION CONNECTOR AND THE INTERNAL HARNESS
FOR OPENS, SHORTS BETWEEN WIRES, AND SHORTS-TO-GROUND
1. Disconnect the external wiring harness from the transmission.
a. For MD, B 300, and B 400 transmissions prior to S/N 6510015259, refer to SIL 11-WT-94, Rev. A.
b. Water and white film contamination have been found in the main transmission connector (external)
in these transmissions. This condition has usually caused the setting of diagnostic codes 25 11 or
22 16.
c. If water is found at the main transmission connector, properly torque the retaining bolt to
2.0–2.8 N·m (18–25 lb in.) following the prescribed cleaning of the connector terminals.
2. Inspect the connectors. Any terminals which are corroded or dirty must be thoroughly cleaned.
+
–
0
+
–
0
CONNECTOR
WIRING HARNESS
Two wires have frayed and are shorted
together. Continuity beeper of VOM will
sound, or reading will go to zero Ohms
when these two wires are probed with
the VOM.
Harness has been chafed and one or more
wires are shorted to ground. VOM continuity
beeper will sound, or reading will go to zero
Ohms when meter is probing between this wire
and chassis ground.
WIRES
SHORTED
TOGETHER
0 OHMS0 OHMS
SHORTED TO
GROUND ON
METAL FRAME
RAIL
GROUND
TO METAL
FRAME RAIL
V01109
CONNECTOR
VOLT-
OHMMETER
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