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Sensing system Shift position sensor - Open circuit (C.20.B.95.81 -
G.30.B.50)
AFX8010
E0128-05 - Trans Shift Position N Sensor
Cause:
The transmission shift position sensor B-37 "N" circuit is open.
Possible failure modes:
1.
Sensor supply or ground wiring is open.
2.
Controller internal failure (internal regulator failure).
Solution:
1.
Enter the Universal Display Plus "DIAG" screen. Select the "TRANSMISSION" sort menu, and select "POS N
SEN" to check the voltage range. The proper voltage when in shift position N is 5.6 - 7.3 volts. The proper
voltage when not in shift position N is 0.5 - 5.6 volts.
A.
If the voltage reading is 7.3 - 9.0 volts, continue with step 2.
B.
If the voltage reading is within the proper limits, continue the troubleshooting at step 6.
NOTE: Visually inspect the wiring harness and connectors. Verify that the connector is fully installed. Inspect
the terminals and wires at the connector for pushed back or corroded terminals or damaged wires. Flex the
harnesses involved to reveal intermittent breaks or shorts in the wiring concerned.
2.
Disconnect the transmission shift position sensor connector X093 at the transmission. Use a jumper wire
to short connector X093 pin 1 to chassis ground.
A.
If the voltage drops to 0 - 0.5 volts indicating a short to ground, the open circuit is not in the supply side
of the circuit. Continue with step 4.
B.
If the voltage remains at 7.3 - 9.0 volts, continue with step 3.
3.
Disconnect the lower frame (LF) harness from the front frame (FF) harness at connector X023. Use a jumper
wire to short connector X023 pin 10 to chassis ground.
A.
If the voltage drops to 0 - 0.5 volts indicating a short to ground, there is an open circuit in the lower
frame (LF) harness between connector X023 pin 10 and connector X093 pin 1 wire 407 yellow. Locate
the open and repair.
B.
If the voltage remains at 7.3 - 9.0 volts, there is an open circuit in the front frame (FF) harness between
connector X023 pin 10 and connector X017 pin J3-28 wire 407 yellow. Locate the open and repair.
4.
Disconnect the transmission shift position sensor connector X093 at the transmission. Use a multimeter to
check for continuity between the harness end of connector X093 pin 6 to chassis ground. There should
be continuity to ground.
A.
If there is continuity to ground, the ground path for the sensor is complete, and the fault is in the sensor
itself. Replace the sensor.
B.
If there is no continuity to ground, the ground path for the sensor is open. Continue with step 5.
5.
Disconnect the lower frame (LF) harness from the front frame (FF) harness at connector X023. Use a
multimeter to check for continuity between the front frame (FF) harness end of connector X023 pin 5 to
chassis ground. There should be continuity to ground.
A.
If there is continuity to ground, there is an open circuit in the lower frame (LF) harness between connector
X023 pin 5 and connector X093 pin 6 wire 426 blue or wire 042 blue. Locate the open and repair.
POWER TRAIN - TRANSMISSION Mechanical
9680 1 27/05/2004
C.20.B / 94
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