E 350 V10-6.8L (2007)
Transmission Position Switch/Sensor: Testing and Inspection
4R70W/4R75W Automatic Transmission
Digital Transmission Range (TR) Sensor Diagnosis Chart
Digital Transmission Range (TR) Sensor Diagnosis Chart
A. TRV is the voltage at the PCM pin 19 (TR3A circuit) to signal return.
B. "In Between" reading could be caused by a selector lever cable or digital TR sensor misaligned or a digital TR sensor circuit failure of TR1, TR2,
TR3A or TR4.
C. TRD: 1= Open Digital TR switch, 0= Closed Digital TR switch.
D. Readings taken from PCM signal pins for TR1, TR2, TR3A or TR4 to signal return.
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Voltages for TR1, TR2, TR4:
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0 = 0.0 volt.
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1 = 9.0 - 14.0 volts.
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Voltage for TR3A:
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0 = 0.0 volt.
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1 = 1.3 - 1.8 volts.
Wiggle Test Information For Open/Shorts
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TR4, TR3A, TR2 and TR1 are all closed in PARK. PARK is a good position to check for intermittent open circuits (with scan tool monitoring
TRD).
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TR4, TR3A, TR2 and TR1 are all open in OVERDRIVE, so OVERDRIVE is a good position to check for shorts to ground. To determine the
shorted components while observing TRD, unplug the TR and determine if the short goes away.
If the short is still present, unplug the transmission harness and determine if the short goes away. If the short is still present, then the short is in the
PCM or vehicle harness. Remove the suspect circuit(s) wire from the PCM vehicle harness.
If the short is still present, then the PCM has an internal failure. Otherwise the failure is in the vehicle harness.
