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Doktor A (864-623-9110)
The rear wheel speed sensor system, sensors and tone wheel, provide critical information not only to the ABS/ESP/ASR systems, but also to the TCM.
The TCM uses this rear speed signal to calculate transmission output shaft speed (The TCM is programmed with the appropriate rear axle ratio).
Transmission output shaft speed is needed to determine slippage, gear selection errors, ratio errors, etc.
Loss of both rear sensor signals or a mismatch of 2 rear signals can result in severe transmission symptoms as well as ABS/ESP/ASR symptoms.
Loss of 1 rear sensor signals can result in sporadic transmission anomalies as well as ABS/ESP/ASR malfunction.
Unlike the front wheel speed sensor tone wheels, the rear tone wheels are heavily exposed to contamination debris ( corrosion fallout, disintegrating hand brake shoe components) which can damage the original, thin stamped steel, tone wheel and wheel sensor face alike.
Also, unlike the front wheel speed sensor system, the rear sensors (and tone wheel face and gap) are not visible until the brake caliper and brake rotor are removed. The top hand brake shoe then needs to be carefully pried forward to inspect the sensor to tone wheel gap and the tone wheel condition.
In rust belt zones, the rear wheel speed sensors can readily seize in their axle mounting bores. Attempting to adjust the speed sensor gaps should NEVER be done without visual inspection and confirmation of gap during adjustment.
The originally installed rear tone wheels are quite thin and fragile. Their 45 degree tone face makes them even more vulnerable to damage.
Original design rear tone wheel, Dodge part# 5134641AA (MBenz # A 902 357 06 51) can now be ordered as a improved, much stronger cast steel component. Dodge part# 5134640AA (MBenz # A 902 357 02 51)
Refer to the factory workshop manual's 'disassembly of rear axle shafts', for details on replacement of damaged rear tone wheels.
Doktor A
The TCM uses this rear speed signal to calculate transmission output shaft speed (The TCM is programmed with the appropriate rear axle ratio).
Transmission output shaft speed is needed to determine slippage, gear selection errors, ratio errors, etc.
Loss of both rear sensor signals or a mismatch of 2 rear signals can result in severe transmission symptoms as well as ABS/ESP/ASR symptoms.
Loss of 1 rear sensor signals can result in sporadic transmission anomalies as well as ABS/ESP/ASR malfunction.
Unlike the front wheel speed sensor tone wheels, the rear tone wheels are heavily exposed to contamination debris ( corrosion fallout, disintegrating hand brake shoe components) which can damage the original, thin stamped steel, tone wheel and wheel sensor face alike.
Also, unlike the front wheel speed sensor system, the rear sensors (and tone wheel face and gap) are not visible until the brake caliper and brake rotor are removed. The top hand brake shoe then needs to be carefully pried forward to inspect the sensor to tone wheel gap and the tone wheel condition.
In rust belt zones, the rear wheel speed sensors can readily seize in their axle mounting bores. Attempting to adjust the speed sensor gaps should NEVER be done without visual inspection and confirmation of gap during adjustment.
The originally installed rear tone wheels are quite thin and fragile. Their 45 degree tone face makes them even more vulnerable to damage.
Original design rear tone wheel, Dodge part# 5134641AA (MBenz # A 902 357 06 51) can now be ordered as a improved, much stronger cast steel component. Dodge part# 5134640AA (MBenz # A 902 357 02 51)
Refer to the factory workshop manual's 'disassembly of rear axle shafts', for details on replacement of damaged rear tone wheels.
Doktor A