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
The oil level sensor (OLS) must have been recognized by autodetect or manually selected using the Pro-Link®
(see WTEC III Pro-Link® Manual) before these codes can be logged.
Code 14 12 indicates the ECU has detected a voltage signal in the low error zone.
Code 14 12 can be caused by:
Faulty wiring to the OLS
A faulty OLS
A faulty ECU
OLS ground wire 135B is common to the TPS and the RMR devices. A power wire short-to-ground for any of
these devices will cause sensor failed low codes (21 12 and 64 12) and shutdown of the electronic pushbutton or
lever selector. An OLS signal open or short-to-ground results in a code 14 12 only. Code 14 23 is programmed out
of all calibrations.
A permanent maximum voltage signal generates a steady OLS sensor maximum count and a maximum fluid level
overfill indication. A maximum overfill indication occurs if signal wire 165 or power wire 124 is shorted to battery
or the ground wire (wire 135) is open between the OLS and the sump temperature sensor branch. An open in the
ground circuit wire 135 in the portion common to the OLS, TPS and RMR devices results in code 14 12, 21 23, and
If the ECU software supports it, Oil Level Sensor counts can be read by a DDR with Pro-Link® version 3.0 (or
later). For a complete description of fluid level checking procedures using the oil level sensor, see Section 5.
Normal operation of the OLS can be checked as follows: Attach the DDR and display OIL LEVEL COUNTS.
Read the number of counts when the engine is not running, but the ignition is ON. The count reading should be
near 255. Start the engine and observe the counts. In normal operation, the count should be 100200 because the oil
level drops when the engine starts and oil from the sump is delivered to other parts of the transmission.
Intermittent connections or lack of battery-direct power and ground connections can cause this and
other electronic control codes.
Active Indicator Clearing Procedure:
Never use a volt/ohmmeter to measure any parameters on the OLS. Damage to the OLS
Oil level sensor failed low
Oil level sensor failed high (not used)
CODE 14 XX OIL LEVEL SENSOR (OLS) (Figure 53)