Vehicle Systems
Specifications
15
Trouble shooting of Delayed Engine Shutdown System
When the ignition key is turned on, the MIL Lamp will illuminate and remain on until the engine is started.
Once the engine is started, the MIL Lamp will go out unless one or more fault conditions are present. If a
detected fault condition exists, the fault or faults will be stored in the memory of the small engine control
module (SECM).
Once an active fault occurs, the MIL Lamp will illuminate and remain ON. This signals the operator that a fault
has been detected by the SECM. If the MIL Lamp turns on while operating the lift truck, park the lift truck
and stop the engine, and then check the follows.
Delayed Engine shutdown : Some faults, such as low oil pressure, will cause the MIL Lamp to
illuminate for 30 seconds and then shut down the engine
FAULT DESCRIPTION
CODE
(M104 CODE)
ECT Over Range
High
Engine Coolant Temperature Sensor Input is High.
Normally set if coolant sensor wire has been disconnected or
circuit has opened to the SECM
151(15)
ECT Over
Temperature
Fault
Engine Coolant Temperature is High.
The sensor has measured an excessive coolant temperature
typically due to the engine overheating
161(15)
Low Oil Pressure
Fault
Low engine oil pressure
521(52)
Transmission Oil
Temperature
Excessive transmission oil temperature
933
Diagnostic Fault Codes
DFC
PROBABLE FAULT
FAULT ACTION
CORRECTIVE ACTION FIRST CHECK
151
(15)
ECT Range High
Coolant sensor
disconnected
or open circuit
(1) Turn on MIL
(2) Delayed Engine
Shutdown
(3) Check Engine Light
Check if ECT sensor connector is
disconnected or for an open ECT
circuit SECM (Signal) Pin B15 to ECT
Pin 3 SECM (Sensor GND) Pin B1 to
ECT Pin 1
161
(15)
ECT Over Temperature
Fault
Engine coolant temperature
is high.
The sensor has measured
an excessive coolant
temperature typically due to
the engine overheating.
(1) Turn on MIL
(2) Delayed Engine
Shutdown
(3) Check Engine Light
Check coolant system for radiator
blockage, proper coolant level and for
leaks in the system.
Possible ECT short to GND, check ECT
signal wiring SECM (Signal) Pin B15 to
ECT pin 3 SECM (Sensor GND) pin B1
to ECT pin 1 SECM (System GND) pin
A16, B 17 Check regulator for coolant
leaks
521
(52)
Low Oil Pressure Fault
Low engine oil pressure
(1) Turn on MIL
(2) Delayed Engine
Shutdown
(3) Check Engine Light
Check engine oil level
Check electrical connection to the oil
pressure switch SECM Pin B9 to Oil
Pressure Switch
933
Trans Oil Temperature
Excessive Transmission oil
temperature
(1) Turn on MIL
(2) Delayed Engine
Shutdown
Refer to drive train manufacturer’s
Transmission service procedures
