Figure 519. Solenoid Resistance vs. Temperature

WTEC III ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL

CODE 45 XX -- OPEN CONDITION IN SOLENOID CIRCUIT (Figure 519)

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 519. Solenoid Resistance vs. Temperature

Troubleshooting:

1. Check the transmission connector and make sure it is tightly connected. If the connector is

properly connected, disconnect the harness at the feedthrough harness connector and check the

terminals in the transmission harness and feedthrough harness connectors.

2. If the connector is connected, clean, and not damaged, check the solenoid circuit in the transmis-

sion for opens. Refer to the system schematic and/or chart to identify wires in the internal har-

ness which are connected. If the open circuit is found, drain the fluid, remove the control

module (see the transmission Service Manual), and isolate the open. The fault will be in the

feedthrough harness or the solenoid itself (see Figure 51 for solenoid locations).

3. If the open is not found at the transmission connector, disconnect the transmission harness

connector at the ECU and inspect the terminals in the connector and the ECU for damage or

contamination. Clean or replace as necessary. If the terminals are satisfactory, check the wires of

the solenoid circuit in the transmission harness for continuity. If the open is found in one of the

wires, isolate and repair it. If this is not feasible, use a spare wire, if available, or provide a new

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

4. If multiple code 45s occur (45 12, 45 13, 45 14, 45 15, 45 16, 45 22, and 45 24), and wiring and

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

5. 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.

6. If code 45 21 occurs repeatedly and the F solenoid and wiring checks okay, the F-Hi or F-Lo driver

may be failed open. Follow Step (5) above.

0021 0093