Coolant Temperature Sensor For Cabin; Opc Controller; Glow Plug - wsm STW37 Workshop Manual

STW34, STW37, STW40, WSM

(15) Coolant Temperature Sensor for CABIN

(16) OPC Controller

(17) Glow Plug

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
(2) and terminal 2 (3) of coolant temperature sensor (1).
3. If the measurement is not indicated, the sensor is damaged.
Resistance
(Sensor terminal 1 Reference value
– terminal 2)
(1) Coolant Temperature Sensor
(2) Terminal 1
OPC Controller
1. Check the "Engine Starting Conditions" and "Automatic Engine
Stop Conditions" (See page 9-M10).
2. If the tractor does not operate appropriately, check all parts
according to the "1. TROUBLESHOOTING" section.
3. If all parts except the OPC controller (1) is not defective, replace
the OPC controller (1),
(1) OPC Controller
Lead Terminal Voltage
1. Disconnect the wiring lead (1) from the glow plug (2) after
turning the main switch off.
2. Turn the main switch key to the "PREHEAT" position, and
measure the voltage between the lead terminal and the chassis.
3. Turn the main switch key to the "START" position, and
measure the voltage with a voltmeter between the lead terminal
and the chassis.
4. If the voltage at either position differs from the battery voltage,
the wiring harness or main switch is faulty.
Main switch key at
"PREHEAT"
Voltage (Lead terminal –
Chassis)
Main switch key at
"START"
(1) Wiring Lead
9-S30
ELECTRICAL SYSTEM
16.4 to 21.2 kΩ
at −20 °C (−4 °F)
1.04 to 1.23 kΩ
at 40 °C (104 °F)
0.15 to 0.16 kΩ
at −100 °C (212 °F)
(3) Terminal 2
9Y1211109ELS0080US0
9Y1211109ELS0045US0
Approx. battery voltage
Approx. battery voltage
(2) Glow Plug
9Y1211109ELS0046US0
KiSC issued 11, 2014 A