Intake Manifold Heater - Check; Check Battery Voltage; Check Thermistor - Dodge D250 1990 Service Manual

Exhaust System and Intake Manifold
DODGE Turbo Diesel
Air System
Page 11-9
Intake Manifold Heater - Check
Check Battery Voltage
The temperature In the intake manifold must be below -9°C
[15°F] (early module before serial number 0080000A) 15°C
[59°FJ (late module) for preheat to occur.
Check the voltage output of the battery.
Minimum: 6.5 volts
Check Thermistor
Disconnect the thermistor.
Turn the ignition switch to the "ON" position.
Note: The "Wait to Start" light should come on.
The solenoids should click on.
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Set the multimeter scale to read DC voltages.
Connect one lead to the KSB Valve wire terminal (A) and the
other to a convenient ground on the engine (B).
There should be no voltage.