SECTION 4 -- WIRE CHECK PROCEDURES

WTEC III ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL

SECTION 4 -- WIRE CHECK PROCEDURES

41.

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 Paragraph 35 to begin the troubleshooting process.

Make sure all connectors are tightly connected and re-check the circuit.

Disconnect and inspect all connectors.

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).

The cleaning solvent must not be chlorine based, contain petroleum distillates, or

conduct electricity. The cleaning solvent should evaporate quickly to prevent the

CAUTION:

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.

Review the WTEC III wire numbering system described in Paragraph 34.

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-T1 and 120-T4.

a. Check continuity of wires 102-T1 and 120-T4 by performing the following (refer to Figure 41):

(1) Disconnect the blue "T" connector from the ECU and disconnect the harness from the transmission

main connector. At one end of the harness, using jumper wire kit J 39197 and connector probes in

J 39775-CP, connect wire 102-T1 and 120-T4 to each other, being careful not to distort the termi-

nals. Jumping the wires together creates a circuit between wires 102-T1 and 120-T4.

TRANSMISSION CONNECTOR

WIRING HARNESS

JUMPER

ECU

"T" CONNECTOR

VOLT/OHM-

( ETER

VOM)

0 OHMS

OHMS

Circuit does not have continuity due

Circuit has continuity. Jumper

to a broken wire (open circuit).

from 102 or 120 to another wire

VOM reading is very high

produces a complete circuit. VOM

(infinite Ohms or OL overlimit).

reading is near zero Ohms.

V03374.01

Figure 41. Open Circuit