Lull 944E-42 Service Manual - Manual (Page 660)

Electrical System
9.150 Model 644E-42/944E-42 Rev. 6/04
9.10.2 Engine Coolant Temperature Gauge Troubleshooting
0000000
RPM X 100
5
10
15
30
20
25
F
1/2
E 104
176
80
248
120 °C
°F
D
r/min
MU4280
Check radiator coolant level,
fan belt tension, radiator cap,
thermostat, and for plugged
condition or debris on radiator.
Engine coolant
temperature gauge
reads incorrectly.
Repair as needed.
Disconnect harness at
temperature sender.
Needle in gauge should
deflect fully to the left.
Check connections at
temperature sender and back
of dash panel.
If OK
Repair as needed.
Replace engine coolant
temperature sender and
retest system.
If OK
If OK
Check circuit for grounded
wire [D4A] (LT BLU).
If grounded, repair wire.
Refer to page 9.48 or 9.50.
Replace dash panel.
If circuit tests OK
Engine Coolant
Temperature
Gauge
Ground sender wire [D4A]
(LT BLU) to engine block.
Needle in gauge should
deflect fully to the right.
If OK
Not
OK
Not
OK
Not
OK
Not
OK
Before troubleshooting any
electrical circuit, ALWAYS begin
by checking the following:
1. Fuses.
2. Battery for proper charge.
3. All connections relating to
circuit are clean and tight.
4. All grounding straps are intact
and securely fastened, refer to
Section 9.1.12, “General
Overview (Vehicle Ground
Strap Locations).”