Intake Manifold Heater Check; Temperature/Cycle Time Chart Of Normal Operation - Dodge D250 1990 Service Manual

Engine Electrical System Replacement Procedures
Page 8-24
Electrical System
DODGE Turbo Diesel
a an ohmmeter and check the resistance from ground to
h heater terminal. The resistance should read "0". Replace
heater or repair connections if necessary.
Meter reading "0
H
= Good heaters
Meter does not move = Bad heaters
Meter reads, but not "0" = Dirty or corroded connections -
clean and repair as necessary
Temperature/Cycle Time Chart of Normal Operation
Engine intake
manifold temperature
Above 15°C
[59°F]
-9°C [15°F] to
15°C 159°F]
-18°C [0°F] to
-9®G [15°F1
-25°C [-15°F] to
-18°C [0°F]
Below-26°C
[- 1 50F]
Preheat Cycle time
ignition key ON
Before crank cycle
0 Seconds
10 Seconds *
15 Seconds
17.5 Seconds
20 Seconds
Postheat Cycle occurrence
Ignition key ON
After crank cycle
No
Yes
Yes
Yes
Yes
Note: The KSB valve activation voltage is independent of the intake manifold heater control system. The KSB valve
will be activated any time the manifold temperature is above 15°C [59°F] and the ignition key is in the ON position.
* Heater Control Modules / Electronic Control Modules with serial numbers below 0080000A will not have Preheat
during this cycle.