Engine System, Diesel
90
Service Manual – SC8000
Diesel Engine Will Not Run at High Speed or Turbo Speed
Conditions:
• With the engine running at idle, press the engine speed switch. (Note that when the speed switch
indicator light is not on, the engine will run at low idle.) The indicator will turn green and the engine will
run at high speed (2200 rpm).
• Hold the engine speed switch for more than two seconds and the engine will run at its highest turbo speed
(2400 rpm).
• Press the engine speed switch again and the engine will revert back to high speed.
• Press the switch again and the engine will revert to idle. See additional troubleshooting notes for control
circuit details.
Component
Current Amps
Coil Ohms
Actuator
1-1.5 Amps
3.2 ohms
Pin#
Wire Color
Function
Voltage at
1300 RPM
Voltage at
2200 RPM
Voltage at
2400 RPM
J2-30 on Driver Box
GRA/BLU
Input from Driver Box
0
0
+12 VDC
J2-29 on Driver Box
GRA/ORN
Input from Driver Box
0
+12 VDC
0
SPEED 1 (2400)
RED
B+
B-
S1
TO ENGINE FLYWHEEL
MAGNETIC PICKUP
+12V (Engine Run Signal)
RELAY PCB
PIN J7-1
PIN J7-5
Mounts to Engine
Injector Pump
FUEL RAIL & SHUT
DOWN ACTUATOR
SPEED 2 (2200)
DIAGNOSTIC
SERVICE TOOL
CONNECTOR
VIO
GRA
S28
WOODWARD
GOVERNOR
Run Relay Out J7-5
Ref: Engine Start/Run
Relay for more detail
+ + + + + + + + + + + + + +
+
+
+
+
+
+
+
+
+
+
+
+
+ + + +
+ +
+ + + + + + + + + + + + + +
OIL PRESSURE
SWITCH
(SHOWN IN LOW
PRESSURE STATE)
- - - - -
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
PIN J1-1
PIN J2-30
PIN J2-29
DRIVER BOX
