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Group 28 Troubleshooting
MID 128 PID 107 Air Filter Dif-
ferential Pressure, Check
(D12B, D12C, D7C Engines)
Special tools: 9998534, J-39200, J-43233, J-
41132
NOTE!
Check all the particular connectors for loose connec-
tions, switch resistance, and oxidation.
For detailed circuit information, refer to “VN/VHD, Electri-
cal Schematics,” Group 37.
Measurement at the Component’s
Connector, to the EECU
1
Note: Check to verify that each of the
following values is correct. Incorrect
values can also cause this component
to fail. It is important to check the
component if any of the values are in-
correct.
2
Disconnect the connector to the air
filter restriction/temperature sensor. In-
stall breakout harness 9998534 to the
wiring harness only.
9998534
Ground wire:
3
Measure the resistance using DMM J-
39200.
Ignition key must be in the OFF posi-
tion.
Measuring
points Optimal value
2 / alternate
ground <1
J-39200
Signal wire/supply wire:
4
Measure the voltage at the supply wire
using DMM J-39200.
Ignition key must be in the ON posi-
tion.
Measuring
points Optimal value
1 / alternate
ground 80% B+
J-39200
Check of Component
Note: Faults in the component can be caused by faults
in the wiring harness of the EECU. Thus, a check of the
wiring harness should also be made before connecting a
new component.
Air Filter Restriction/Temperature Sensor
1
Disconnect the connector to the air
filter restriction/temperature sensor. In-
stall breakout harness 9998534 to the
sensor harness end only.
9998534
2
Measure the resistance with DMM J-
39200.
Ignition key must be in the OFF posi-
tion.
Measuring
points Optimal value
1 / 2 330 (inactive;
normal position)
1 / 2 2.2 k (active)
J-39200
Check of Subsystem
Air Filter Indicator
1
Connect breakout box J-41132 in se-
ries between connector EB and the
EECU. Connect jumper harness J-
43233 in series between connector EA
and the EECU.
2
Measure the voltage with DMM J-
39200.
Ignition key must be in the ON posi-
tion.
Measuring
points Optimal value
EB8 / EB17 1.35 V (inactive;
normal position)
5.1 V (active)
J-41132
J-43233
J-39200
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