CODE 42 XX -- SHORT-TO-BATTERY IN SOLENOID CIRCUIT

WTEC III ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL

CODE 42 XX -- SHORT-TO-BATTERY IN SOLENOID CIRCUIT (Figure 514)

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.

NOTE:

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.

Main

Code

Subcode

Meaning

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

Active Indicator Clearing Procedure:

Power down

Manual

NOTE:

Intermittent connections or lack of battery-direct power and ground connections may cause this and

other codes.

NOTE:

Before troubleshooting, read Paragraph 56. Also, check battery and ECU input voltages.

NOTE:

Energizing the solenoids and listening for ball/plunger movement is sometimes useful in

troubleshooting.

NOTE:

"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

temperature.

0021 0084