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Compatible with Jeep Models:
Grand Cherokee Laredo 1999-2004 WJ Series 6Cyl 4.0L
Grand Cherokee Laredo 1999-2004 WJ Series 8Cyl 4.7L
Grand Cherokee Limited 1999-2004 WJ Series 6Cyl 4.0L
Grand Cherokee Limited 1999-2004 WJ Series 8Cyl 4.7L
Grand Cherokee Sport 2002 WJ Series 6Cyl 4.0L
Grand Cherokee Sport 2002 WJ Series 8Cyl 4.7L
Grand Cherokee Overland 2002-2004 WJ Series 8Cyl 4.7L
Grand Cherokee Special Edition 2004-2004 WJ Series 6Cyl 4.0L
Grand Cherokee Special Edition 2004-2004 WJ Series 8Cyl 4.7L
2009 - 2010 Dodge Challenger
2007 - 2010 Dodge Charger
2006 - 2010 Dodge Charger
2004 - 2008 Dodge Dakota
2000 - 2010 Dodge Dakota
2009 - 2010 Dodge Dakota
2004 - 2008 Dodge Durango
2006 - 2007 Dodge Durango
2000 - 2009 Dodge Durango
2001 - 2009 Dodge Durango
2009 - 2009 Dodge Durango
2004 - 2009 Dodge Durango
2011 - 2013 Dodge Durango
2011 - 2013 Ram 1500 Truck
2011 - 2012 Ram 1500 Truck
2011 - 2011 Ram Dakota
2005 - 2008 Dodge Magnum
2005 - 2008 Chrysler 300
2009 - 2010 Chrysler 300
2006 - 2008 Chrysler 300
1999 - 2006 Jeep Grand Cherokee
2005 - 2006 Jeep Grand Cherokee
2008 - 2010 Jeep Grand Cherokee
2008 - 2013 Jeep Grand Cherokee
2003 - 2011 Jeep Wrangler
2002 - 2012 Jeep Liberty
2002 - 2002 Jeep Liberty
2005 - 2006 Jeep Liberty
2003 - 2003 Jeep Liberty
2006 - 2007 Mitsubishi Raider
2008 - 2009 Mitsubishi Raider
2006 - 2008 Jeep Commander
2009 - 2010 Jeep Commander
2007 - 2010 Jeep Commander
2007 - 2009 Chrysler Aspen
2009 - 2011 Dodge Nitro
2004 - 2008 Dodge Ram 1500 Truck
2002 - 2010 Dodge Ram 1500 Truck
2003 - 2010 Dodge Ram 1500 Truck
2002 - 2005 Dodge Ram 1500 Truck
2005 - 2010 Dodge Ram 2500 Truck
2003 - 2004 Dodge Ram 2500 Truck
2003 - 2003 Dodge Ram 3500 Truck
2005 - 2010 Dodge Ram 3500 Truck
The Input and Output Speed Sensors are two-wire magnetic pickup devices that generate AC signals as rotation occurs. They are mounted in the left side of the transmission case and are considered primary inputs to the Transmission Control Module (TCM).
Note:
The 42RE transmissions use a single sensor (located on the overdrive gear case, over the park gear).
The 45RFE / 545RFE transmissions use two sensors, an input speed sensor and an output speed sensor. Both are the same part number.
Operation:
The Input Speed Sensor provides information on how fast the input shaft is rotating. As the teeth of the input clutch hub pass by the sensor coil, an AC voltage is generated and sent to the TCM. The TCM interprets this information as input shaft rpm.
The Output Speed Sensor generates an AC signal in a similar fashion, though its coil is excited by rotation of the rear planetary carrier lugs. The TCM interprets this information as output shaft rpm.
The TCM compares the input and output speed signals to determine the following:
- Transmission gear ratio
- Speed ratio error detection
- CVI calculation
The TCM also compares the input speed signal and the engine speed signal to determine the following:
- Torque converter clutch slippage
- Torque converter element speed ratio
Sensor
failure:
Failure of the Transmission Input Shaft Speed Sensor and/or the Output Shaft Speed Sensors are somewhat common on early model WJ Grand Cherokees. Diagnostic Trouble codes that may be tripped are:
P0500 - No vehicle speed sensor signal
P0720 - Low Output SPD Sensor RPM Above 15 MPH
The relationship between the Output Shaft Speed Sensor and vehicle speed is not
within acceptable limits.
P0720 - Low Output SPD Sensor RPM Above 15 MPH
Output shaft speed is less than 60 rpm with vehicle speed above 15 mph (4-speed auto. trans. only).
P0721-P0723 - Sensor circuit range, performance, no signal
Speed sensor removal
1. Raise vehicle.
2. Place a
suitable fluid catch pan under the transmission.
3. Remove the wiring connector from the input speed sensor.
4. Remove the bolt holding the input speed sensor to the transmission case.
5. Remove the input speed sensor from the transmission case.
Speed sensor installation
1. Install the input
speed sensor into the transmission case.
2. Install the bolt to hold the input speed sensor into the transmission case. Tighten the bolt to 105 in.lbs. (11.9 N�m).
3. Install the wiring connector onto the input speed sensor
4. Verify the transmission fluid level. Add fluid as necessary.
5. Lower vehicle.
WJ speed sensors | ||
Output speed sensor for 42RE transmission (1999-2004) | P/N 4800879 (supercedes P/N 4412879) | List price: $18.35 |
Input speed sensor for 45RFE / 545RFE transmission (1999-2005) | P/N 4799061AB | List price: $36.70 |
Output speed sensor for 45RFE / 545RFE transmission (1999-2005) | P/N 4799061AB | List price: $36.70 |