Chrysler PT Cruiser Service & Repair Manual page 1689

PT
SPEED SENSOR - OUTPUT (Continued)
Fig. 310 O-Ring Location
1 - OUTPUT SPEED SENSOR
2 - O-RING
OPERATION
The Output Speed Sensor provides information on
how fast the output shaft is rotating. As the rear
planetary carrier park pawl lugs pass by the sensor
coil (Fig. 311), an AC voltage is generated and sent to
the PCM/TCM. The PCM/TCM interprets this infor-
mation as output shaft rpm.
Fig. 311 Sensor Relation to Planet Carrier Park Pawl
1 - OUTPUT SPEED SENSOR
2 - REAR PLANET CARRIER/OUTPUT SHAFT ASSEMBLY
3 - TRANSAXLE CASE
The PCM/TCM compares the input and output
speed signals to determine the following:
• Transmission gear ratio
• Speed ratio error detection
• CVI calculation
41TE AUTOMATIC TRANSAXLE
VEHICLE SPEED SIGNAL
The vehicle speed signal is taken from the Output
Speed Sensor. The PCM converts this signal into a
pulse per mile signal and sends the vehicle speed
message across the communication bus to the BCM.
The BCM sends this signal to the Instrument Cluster
to display vehicle speed to the driver. The vehicle
speed signal pulse is roughly 8000 pulses per mile.
REMOVAL
CAUTION: When disconnecting speed sensor con-
nector, be sure that the connector weather seal
does not fall off or remain in old sensor.
(1) Disconnect the battery cables.
(2) Remove air cleaner assembly (Fig. 312) .
Fig. 312 Air Cleaner Assembly Removal/Installation
1 - AIR CLEANER ASSEMBLY
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