B3000 SE Regular Cab 4WD V6-3.0L OHV (1998)
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TR_V is the voltage at PCM Pin 64 (TR3A circuit) to signal return.
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TR_D: 1 = open DTR switch. 0= closed DTR switch.
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Breakout box readings: Taken from PCM signal pins for TR1 TR2, TR3A, TR4 to signal return.
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Voltages for TR1, TR2, and TR4:
-0 = 0.0 volts (circuit shorted to ground)
-1 = 9.0-14.0 volts (open circuit)
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Voltages for TR3A:
-0 = 0.0 volts (circuit shorted to ground)
-1 = 1.3-1.8 volts (open circuit)
-1.8-5.0 volts = invalid reading (open in wires or bad resistor in DTR sensor).
Refer to Workshop Manual section 05 under Digital Transmission Range (DTR) Sensor for additional diagnostic procedures.
6.
In addition to Workshop Manual procedures, the following tips are provided.
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"In Between" readings could be caused by a shift cable or DTR sensor misalignment or a DTR circuit failure of TR1, TR2, TR3A, or TR4.
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TR1, TR2, TR3A, and TR4 are all CLOSED in Park (shorted to signal return). Park is a good position to check for intermittent open circuits
(with NGS monitoring TR_D).
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TR1, TR2, TR3A, and TR4 are all open in Overdrive (O/D). O/D is a good position to check for shorts to ground. To determine the shorted
component, unplug each connector while observing TR_D. If the short is in the PCM, remove the suspect circuit(s) wire terminal from the
PCM connector. If the short still persists, then the PCM has an internal failure, otherwise the failure is in the vehicle harness.
7.
Verify repair.
