Inspection Of Throttle Position Sensor; Inspection Of Water Temperature Sensor; Inspection Of Power Relay - TOHATSU MD 70-90C2 Service Manual

14) Inspection of Throttle Position Sensor

This test can be made without removing parts.
1. Measure resistance between terminals.
Replace throttle position sensor if the resistance is out of
specified range.
When lever is at position A (wide open throttle) :
Between a - c
Between e - g
Between a - b
Between e - f
When lever is at position B (fully closed throttle) :
Between a - c
Between e - g
Between a - b
Between e - f

15) Inspection of Water Temperature Sensor

Remove the part and test it as a separate unit.
1. Remove water temperature sensor from engine.
2. Put water temperature sensor in the water, and warm up
water slowly.
3. Measure water temperature sensor resistance. Replace if
other than specified value.
Water Temperature Sensor Resistance
(Reference Value) :
0.91 - 1.37 kΩ at 20˚C (68 ˚F)
0.13 - 0.19 kΩ at 80˚C (176 ˚F)

16) Inspection of Power Relay

・This test can be made without removing parts.
・Insert probe to covered aria of terminals, then
measure resistance.
Measure resistance between a and b terminals.
1.
Replace relay if the resistance is out of specified range.
Resistance between a and b terminals :
@20˚C (68˚F)
90 - 110 Ω
Apply 12V between terminals a and b and check
2.
conductivity between c and d.
Resistance between terminals : @20˚C (68˚F)
To be conductive when 12V is applied between
a and b.
To be non conductive when no voltage is applied
between a and b.
TLDI 75/90C2 2010
: 4 - 6 kΩ
b - c
: 4 - 6 kΩ : 0.5 - 1 kΩ
f - g
: 4 - 6 kΩ
b - c
: 0.5 - 1 kΩ : 4 - 6 kΩ
f - g
e
f
g
A B
c
a
a
b
c
8
b
d
8-15