Figure 515. Solenoid Resistance vs. Temperature

WTEC III ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL

CODE 42 XX -- SHORT-TO-BATTERY IN SOLENOID CIRCUIT (Figure 515)

WT SOLENOID RESISTANCE

SPEC VALUE = 3.26 .2 OHMS AT 20C

5.2

4.8

4.6

4.4

4.2

MAXIMUM OHMS

3.8

3.6

3.4

MINIMUM OHMS

3.2

2.8

2.6

2.4

SUMP TEMPERATURE IN F

2.2

104

140

176

212

248

284

100

120

140

SUMP TEMPERATURE IN C

V00719.01

Figure 515. Solenoid Resistance vs. Temperature

Troubleshooting:

1. Make sure the transmission connector is tightly connected. If the connector is properly connected,

disconnect the wiring harness at the transmission. Check the connector for corroded or damaged

terminals. Clean or replace as necessary.

2. Test each solenoid circuit at the transmission connector for shorts between the solenoid circuit be-

ing diagnosed and all other terminals in the connector. This test may be simplified by using the

J 41612 test tool. Refer to the system schematic and/or chart to identify wires in the internal har-

ness which are connected. If a short is found, isolate and repair the short. The short will probably

be in the internal wiring harness.

3. If multiple code 42s occur (42 12, 42 13, 42 14, 42 12, 42 16, 42 22, and 42 24), and wiring and

solenoids check okay, the A-Hi driver is probably failed open.

4. Replace the ECU. If replacing the ECU corrects the problem, reinstall the original (bad) ECU to

confirm that the problem is in the ECU. If the problem recurs, reinstall the new ECU to complete

the repair.

5. If code 42 21 occurs repeatedly and the F solenoid and wiring checks okay, the F-Hi or F-Lo driver

may be failed open. Follow Step (4) above.

6. If codes 42 23 and 42 26 occur repeatedly and solenoids and wiring check okay, the H and N-Hi

driver may be failed open. Follow Step (4) above.

7. If the short is not found at the transmission connector, disconnect the transmission "T" harness

connector at the ECU and check the wires of the solenoid circuit for shorts between the solenoid

wires. If the short is found in one of the wires, isolate and repair it. Use a spare wire, if available,

or provide a new wire (St. Clair P/N 200153 may be used for this purpose).

0021 0085