Low Coolant Indicator Inoperative
- Turn ignition off. Disconnect low engine coolant level switch.
Low engine coolant level switch is located in coolant reservoir on
right side of engine compartment. Connect jumper wire between low
engine coolant level switch connector terminals. If low engine coolant
level indicator illuminates for more than 5 seconds and coolant level
is below switch in reservoir, replace low engine coolant level switch.
If low engine coolant level indicator illuminates for more than 5
seconds and coolant level is above switch in reservoir, lower engine
coolant level and retest system. If low engine coolant level indicator
illuminates for 5 seconds or less, go to next step.
- Measure resistance between ground and low engine coolant level
switch connector Black wire. If resistance is less than 5 ohms, go to
next step. If resistance is 5 ohms or more, repair open Black
wire.
- Disconnect instrument interface module. Instrument interface
module is located behind left side of instrument panel. Measure
resistance of White/Green wire between instrument interface module
connector terminal No. 12 and low engine coolant level switch
connector. See
Fig 1
. If resistance is
less than 5 ohms, go to next step. If resistance is 5 ohms or more,
repair open White/Green wire.
- Connect jumper wire between ground and instrument interface
module connector terminal No. 13 (Black/Yellow wire). If resistance is
less than 5 ohms, check low engine coolant level indicator bulb and
replace as necessary. If bulb is okay, replace instrument cluster
printed circuit. See PRINTED
CIRCUIT
under REMOVAL & INSTALLATION. If resistance is more
than 5 ohms, repair open Black/Yellow wire.
- Turn ignition off. Remove instrument cluster. See
INSTRUMENT CLUSTER
under
REMOVAL & INSTALLATION. Disconnect instrument cluster connector C1.
See Figure
,
Figure
and
Fig 1
. Measure resistance
of Black/Yellow wire between instrument interface module connector
terminal No. 13 and instrument cluster connector C1 terminal No. 14.
If resistance is less than 5 ohms, check low engine coolant level
indicator bulb and replace as necessary. If bulb is okay, replace
instrument cluster printed circuit. See
PRINTED CIRCUIT
under
REMOVAL & INSTALLATION. If resistance is more than 5 ohms, repair open
in Black/Yellow wire.
Courtesy of FORD MOTOR CO.