Subsection 13 (GEARBOX AND 4X4 COUPLING UNIT (WITH GBPS))
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Testing the GBPS Input Voltage
NOTE:
Prior to conduct testing, check fault codes
in B.U.D.S.
Back-probe the GBPS connector using
FLUKE
RIGID BACK-PROBE (P/N TP88)
or equivalent.
Test as follow:
MULTIMETER PROBE POSITIONS
VOLTAGE
PIN 1 and PIN 3 of the GBPS connector
5 volts
If voltage is adequate, check GBPS signal wire.
If there is no voltage, check each GBPS input as
follows.
MULTIMETER PROBE POSITIONS
VOLTAGE
GBPS connector (pin 1)
and battery ground
5 volts
GBPS connector (pin 3)
and b terminal
Battery
voltage
If there is no voltage, check wires and connector
pins. Replace or repair defective parts and reset
fault codes.
Testing the GBPS Signal Wire
Continuity
Unplug ECM connector and connect it to the
adapter tool.
REQUIRED TOOL
ECM ADAPTER TOOL (P/N 529 036 166)
MULTIMETER PROBE
POSITIONS
RESISTANCE
@ 20°C (68°F)
GBPS connector (pin 2)
and ECM adapter tool (pin D2)
Below 1
If resistance is out of specification, check wires
and connectors. Repair and reset fault codes.
If resistance is good and the other tests suc-
ceeded, replace the GBPS and reset fault codes.
NOTE:
The GBPS must be reset.
Removing the GBPS
Set shift lever in NEUTRAL position.
Unplug GBPS connector.
Remove screws and withdraw GBPS.
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1. Screws
2. Gearbox Position Sensor (GBPS)
Installing the GBPS
For installation, reverse the removal procedure.
Pay attention to the following details.
Shift lever must be in the NEUTRAL position.
Align GBPS with the flat on the shift drum shaft.
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