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 22 indicates a fault within a speed sensor, the wiring to a speed sensor, incorrect speed sensor gap, or
damaged bumps or teeth which create the speed signal. This fault is determined by the reasonableness of a speed
sensor signal when compared with the other two speed sensors and the commanded range. A speed sensor will not
pass the reasonableness test if there is no signal at all from that sensor when a signal should be present.
If turbine speed is below 150 rpm when output speed is below 100 rpm and engine speed is above
400rpm, Neutral Very Low (NVL) is commanded when N (Neutral) is the range selected. NVL is
attained by turning D solenoid ON in addition to E solenoid. This causes the output to be locked
(C4and C5 clutch applied).
If the engine speed sensor code (2214) is active and a range verification test is failed, the range
verification code will not be set but a DO NOT SHIFT response is commanded.
Active Indicator Clearing Procedure:
Before troubleshooting, read Paragraph 56. Also, check the ECU input voltage.
1. Check to see if the sensor is loose, missing, or disconnected. If not, disconnect the wiring harness
from the sensor and measure the resistance of the sensor (see chart below). Also check the termi-
nals for dirt, corrosion, or damage. If resistance is not correct, replace the sensor.
2. Remove the transmission harness connector from the ECU. Check the sensor circuit (in the exter-
nal harness) for open wires, shorts between wires, or shorts-to-ground. Isolate and repair any
3. If no opens or shorts are found, the condition must be intermittent. Replace the sensor indicated
by the trouble code. Before replacing a speed sensor, check the sensor for physical damage or
contamination. Refer to the appropriate transmission Service Manual for proper replacement pro-
4. If the condition recurs, install new wiring (twisted-pair) for the sensor circuit between the ECU
and the transmission. Use St. Clair P/N 200153 Service Harness Twisted Pair for this purpose.
CODE 22 XX SPEED SENSOR/CIRCUITRY FAULT (Figure 55)