Copyright © 1998 General Motors Corp. 4–1
WTEC II ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL
4–1. CHECKING OPENS, SHORTS BETWEEN WIRES, AND SHORTS-TO-GROUND
(Use Digital Volt-Ohmmeter J 34520-A and Jumper Wire Set J 39197).
NOTE: Please refer to Section 3–5 to begin the troubleshooting process.
1. Make sure all connectors are tightly connected and recheck the circuit.
2. Disconnect and inspect all connectors.
3. Thoroughly clean corroded or dirty terminals. If dirty or corroded terminals are the probable cause of
the problems, reconnect the clean connectors and operate the vehicle normally. If the problem recurs,
proceed with Step 4.
4. If all connectors are clean and connected correctly, determine which wires in the chassis harness are
indicated by the diagnostic code. For example, Code 41 12, indicates an open or short-to-ground in
the solenoid A circuit — wires 102 and 120.
a. Check continuity of wires 102 and 120 by performing the following (refer to Figure 4–1):
(1) Disconnect both connectors at the ECU and disconnect the harness from the transmission
main connector. At one end of the harness, using jumper wire kit J 39197, connect wire 102
and 120 to each other, being careful not to distort the terminals. Jumping the wires together
creates a circuit between wires 102 and 120.
(2) On the opposite end of the harness, check the continuity of the jumpered pair. No continuity in
a jumpered pair circuit (infinite resistance reading) indicates an open in the wire being tested.
Locate and repair the damaged portion of the wire.
Figure 4–1. Open Circuit
CAUTION:
The cleaning solvent must not be chlorine based, contain petroleum distillates, or conduct
electricity. The cleaning solvent should evaporate quickly to prevent the possibility of
condensation within the connectors. Always blow or shake any excess cleaner from the
connector before assembling it to its mating connector or hardware. Cleaner trapped in the
connector can affect the connector seal. (Refer to SIL 17-TR-94 for detailed information
on the recommended cleaners.)
+
–
0
+
–
VOLT-
OHMMETER
0 OHMS OHMS
V00633.03
CONNECTOR
WIRING HARNESS
CONNECTOR
JUMPER
Circuit has continuity. Jumper
from 102 or 120 to another wire
produces a complete circuit. VOM
reading is near zero Ohms.
Circuit does not have continuity due
to a broken wire (open circuit). VOM
reading is very high (infinite Ohms or OL–Overlimit).
S
ECTION
4 — WIRE CHECK PROCEDURES
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