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Group 28 Troubleshooting
MID 128 PID 111 Coolant Level,
Check
Special tools: J-43233, J-39200, J-41132, J-
42472
NOTE!
Check all the particular connectors for loose connections
as well as for switch resistance and oxidation.
For detailed circuit information, refer to “VNL, VNM Elec-
trical Schematics,” Group 37.
Measurement at the component’s
connector, to the EECU
1
Note: An incorrect value (below) can
also cause the component to fail;
therefore, it is important to check the
component if any of the values are in-
correct.
2
Disconnect the connector to the
coolant level sensor. Install breakout
harness J-42472 to the wiring harness
end only.
J-42472
Ground wire:
3
Measure the resistance with ohmme-
ter J-39200.
Ignition key must be in the OFF posi-
tion.
Measuring
points Optimal value
1 / alternate
ground <1
J-39200
Signal wire:
4
Measure the resistance with ohmme-
ter J-39200.
Ignition key must be in the OFF posi-
tion.
Measuring
points Optimal value
2 / alternate
ground 2.1 k
J-39200
Check of component
The coolant level sensor
1
Disconnect the connector to the
coolant level sensor. Install breakout
harness J-42472 to the sensor har-
ness end only.
Measure the resistance with ohmme-
ter J-39200.
Ignition key must be in the OFF posi-
tion.
Measuring
points Optimal value
1 / 2 open circuit
(coolant level
normal)
1 / 2 <1 (coolant
level low)
1 / alternate
ground open circuit
2 / alternate
ground open circuit
J-39200
J-42472
Check of Subsystem
Coolant level
1
Ignition key must be in the ON posi-
tion.
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.
Measuring
points Optimal value
EB7 / EB8 80% B+ (open,
coolant level nor-
mal)
EB7 / EB8 0 V (closed,
coolant level low)
J-41132
J-43233
J-39200
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