Service and Repair Manual December 2023
Ford MSG-425 Engine Fault Codes
154 GS
â„¢
-3390 • GS
â„¢
-4390 • GS
â„¢
-5390 Part No. 1325652GT
How t o R etrie ve For d En gin e Fa ult C od es
How to Retrieve Ford Engine
Fault Codes
The ECM constantly monitors the engine by the
use of sensors on the engine. The ECM also uses
signals from the sensors to initiate sequential fuel
injection and make constant and instantaneous
changes to ignition timing, fuel delivery and throttle
position to maintain the engine's running condition
at its highest efficiency while at the same time
keeping exhaust emissions to a minimum. When a
sensor fails or returns signals that are outside of
set parameters, the ECM will store a fault code in
memory that relates to the appropriate sensor and
will turn on the Check Engine Light.
1 Open the ground controls side cover.
2 Pull out the red Emergency Stop button to the
on position at both the ground and platform
controls. Turn the key switch to ground
controls.
3 Quickly activate and release the start toggle
switch/button. Do not start the engine.
4 Move and hold the run/test toggle switch to
the test position.
Result: The check engine light should turn on.
The check engine light should begin to blink.
5 Continue to hold the run/test toggle switch in
the test position. Count the blinks and note
the results. Refer to the Fault Codes section,
Ford MSG-425 Engine Fault Codes.
Note: Before the fault codes are displayed, the
check engine light will blink a code 1-6-5-4 three
times. After the fault codes, the check engine light
will blink a code 1-6-5-4 three times again
indicating the end of the stored codes.
Note: If any fault codes are present, the ECM will
blink a three digit code three times for each code
stored in memory. It will blink the first digit of a
three digit code, pause, blink the second digit,
pause, and then blink the third digit. For example:
the check engine light blinks 5 consecutive times,
blinks 3 times and then 1 time. That would indicate
code 531.
Note: Once a fault code has been retrieved and
the repair has been completed, the ECM memory
must be reset to clear the fault code from the
ECM. Refer to Fault Codes Procedure, How to
Clear Engine Fault Codes from the ECM.
How to Clear E ngi ne Fa ult Co des fr om th e ECM
How to Clear Engine Fault Codes
from the ECM
Note: Perform this procedure with the engine off
and the key switch in the off position.
1 Locate the battery under the ground control
panel.
2 Disconnect the negative battery cable from
the battery for a minimum of 20 minutes.
Electrocution/burn hazard.
Contact with electrically charged
circuits could result in death or
serious injury. Remove all rings,
watches and other jewelry.
3 Connect the negative battery cable to the
battery.
4 Start the engine and allow it to idle for
approximately ten minutes.
Result: The check engine light should not turn
on.
Result: If the check engine light is on, the
ECM is detecting a fault code. Refer to Fault
Codes Procedure, How to Retrieve Engine
Fault Codes.
To Next Page
Loading...
Need help?
General
