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Sensing system Coolant level - Short circuit to B+ (B.50.A.95.93 -
G.30.B.54)
AFX8010
E0005-03 - Coolant Level Switch
Cause:
The coolant level switch (S-67) circuit is shorted to a higher than normal voltage source.
Possible failure modes:
1.
Switch supply wiring shorted to 12 volts.
2.
Controller internal failure (internal regulator failure).
Solution:
1.
Enter the Universal Display Plus "DIAG" screen. Select the "ENGINE" sort menu, and select "COOLANT
LEVEL SW" to check the voltage range.
The normal operating range for the coolant level switch circuit is 1.8 - 10.0 volts
A.
If the voltage reading is 10.0 volts or greater, continue with Step 2.
B.
If the voltage reading is within the proper limits, the shorted wire may not be powered up at this time.
Continue the troubleshooting at Step 4.
2.
Disconnect the coolant level switch connector X439.
A.
If the voltage drops below 10 volts, there is a fault in the switch. Replace the switch.
B.
If the voltage is above 10.0 volts, continue with Step 3.
3.
Disconnect the engine (EN) harness from the main frame (MF) harness at connector X010.
A.
If the voltage drops back within range, the short is in the engine (EN) harness between connector X010
and connector X439 wire 1216 yellow. Locate the short and repair.
B.
If the voltage remains above 10.0 volts, the short is in the main frame (MF) harness between connector
X010 and connector X019 pin J2-39 wire 1216 yellow. Locate the short and repair.
4.
Visually inspect the harness and connectors for damage, bent or dislocated pins, corroded terminals or
broken wires.
A.
If no damage is found, erase the fault code and continue operation.
POWER PRODUCTION - ENGINE COOLANT SYSTEM
9675 1 27/05/2004
B.50.A / 38
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