Powertrain Controls - ECM/PCM

CODE 34 LOCK UP DUTY SOLENOID

Code Chart 34:

Transaxle Valve Body Circuit:

CIRCUIT DESCRIPTION:

The purpose of the Torque Converter Clutch (TCC) lock-up duty solenoid is to eliminate the power loss of the converter stage when the vehicle is in a cruise condition. This allows the convenience of the automatic transaxle and the fuel economy of a manual transaxle. Lock-up only takes place when in the economy mode. The ECU supplies B+ to the lock-up solenoid to energize the solenoid for lock-up.

TEST DESCRIPTION: Numbers below refer to the circled numbers on the diagnostic chart.

1. With key "ON," there should be less than 1.0 volt on BRN/WHT wire.

2. ECU should apply B+ to lock-up solenoid above 40 mph.

3. Resistance of solenoid should be 20 to 30 ohms.

DIAGNOSTIC AIDS:

Make sure vehicle is in the economy mode when checking lock-up. A faulty connection or an open or short in the BRN/WHT wire can result in a Code 34. An intermittent may be caused by a poor connection, rubbed through wire insulation or a wire broken inside the insulation.