wsm M7040 - Switch and Sensor

ELECTRICAL SYSTEM
M6040, M7040, WSM
9-S28
(4) Switch and Sensor
Checking Engine Oil Pressure Switch
1. Measure the resistance with an ohmmeter across the switch
terminal and the chassis.
2. If 0 ohm is not indicated in the normal state, the switch is faulty.
3. If infinity is not indicated at pressure over 50 kPa (0.5 kgf/cm
2
,
7 psi), the switch is faulty.
9Y1210143ELS0043US0
Checking Coolant Temperature Sensor
1. Disconnect the connector from the coolant temperature sensor
(1).
2. Measure the resistance with an ohmmeter across the terminal 1
and 2 of coolant temperature sensor (1).
3. If the measurement is not indicated, the sensor is faulty.
9Y1210143ELS0044US0
Resistance
(Switch terminal –
Chassis)
In normal state 0 Ω
At pressure over approx.
50 kPa (0.5 kgf/cm
2
, 7 psi)
Infinity
(1) Engine Oil Pressure Switch
Resistance
(Sensor terminal
1 – terminal 2)
Reference
value
Approx. 117 Ω at 120 °C (248 °F)
Approx. 189 Ω at 100 °C (212 °F)
Approx. 290 to 354 Ω at 80 °C (176 °F)
Approx. 808 Ω at 50 °C (122 °F)
Approx. 2.21 to 2.69 kΩ at 20 °C (68 °F)
(1) Coolant Temperature Sensor
KiSC issued 07, 2012 A