W T E C I I I E L E C T R O N I C C O N T R O L S T R O U B L E S H O O T I N G M A N U A L
Main code 42 indicates the ECU has detected a short-to-battery condition in a solenoid wiring circuit. The DO
NOT SHIFT response is activated when some subcodes are detected, all solenoids are turned off and the CHECK
TRANS light is illuminated. All solenoids have a driver on the low (ground) side which can turn off the solenoid.
All solenoids also have a driver on the high (power) side of the solenoid. Even though the high side driver can be
turned off, a short-to-battery means the solenoid is continuously powered at an unregulated 12V or 24V instead of
a regulated (pulse width modulated) voltage. The low side driver will not tolerate direct battery current and will
open, causing the solenoid to be deenergized.
For subcodes 12, 13, 14, 15, 16, 22 neutral start is inoperable; all display segments are on if the
code is logged during ECU initialization (ignition on). Subcodes 21, 23, 24, and 26 will not trigger the
CHECK TRANS light.
Active Indicator Clearing Procedure:
Intermittent connections or lack of battery-direct power and ground connections may cause this and
Before troubleshooting, read Paragraph 56. Also, check battery and ECU input voltages.
Energizing the solenoids and listening for ball/plunger movement is sometimes useful in
N solenoid on the retarder accumulator has either a 12.5 ± 1.5 Ohm coil or a 23.5 ± 2.4 Ohm coil
and is not correlated to sump temperature.
PROBING THE CONNECTOR
When testing the control system from the feedthrough connector with the internal harness connected, the resistance
of each solenoid can be measured by using a VOM. Refer to Figure 515 for solenoid resistance versus
Short-to-battery A Solenoid Circuit
Short-to-battery B Solenoid Circuit
Short-to-battery C Solenoid Circuit
Short-to-battery D Solenoid Circuit
Short-to-battery E Solenoid Circuit
Short-to-battery F Solenoid Circuit
Short-to-battery G Solenoid Circuit
Short-to-battery H Solenoid Circuit
Short-to-battery J Solenoid Circuit
Short-to-battery N Solenoid Circuit
CODE 42 XX SHORT-TO-BATTERY IN SOLENOID CIRCUIT (Figure 514)