SkyTrak 8042 Service Manual - Manual (Page 614)

9.23 Model 8042, 10042, 10054 Legacy Rev. 10/03
Electrical System
b. Flash-Out of Fault Codes
Fault flash-out mode can be entered through the use of a
diagnostic switch or the accelerator pedal. To enter the
fault flash-out mode, the key switch must be in the RUN
position with the engine not running.
When a diagnostic switch is used to enter the fault
flash-out mode, the ECM will automatically flash the first
fault code after the switch is turned to the RUN position.
The diagnostic increment/decrement is used to sequence
forward or backwards through the active faults.
To enter fault flash-out mode using the accelerator pedal,
fully depress and release the pedal 3 times. Once in
diagnostic mode, cycling the accelerator pedal will
sequence forward through the active faults. The following
graphic depicts the pattern of the fault code flash-out
scheme as indicated by the stop lamp.
Stop Lamp (1) - The stop lamp provides critical operator
messages. These messages require immediate and
decisive operator response. The stop lamp is also used
to diagnose flash-out fault codes.
Warning Lamp (2) - The warning lamp provides
important operator messages. These messages require
timely operator attention. The warning lamp is also used
to delineate diagnostic fault codes.
There is a laminated Wiring Diagram and Fault Code
Information Chart available from your local Cummins
Distributor. Call the Cummins Customer Assistance
Center at 1-800-343-7357.
Offboard Diagnostics
INSITE™, is the Windows®-based PC service/
programming/diagnostic tool for 944E-42 engine. It is
used to help troubleshoot and repair the engine with
extended fault diagnostics and processing power.
INSITE™ allows the user to view active and inactive
faults and clear the inactive faults. It provides a monitor
function that allows the service technician to monitor
measured parameters, actuator status and some
calculated values. It also provides the technician with the
capability to turn on certain drivers such as the grid
heaters and lift pump as well as running diagnostic tests
such as single cylinder cutout.
9.7.3 Troubleshooting with a Digital
Multimeter (DMM)
IMPORTANT: Circuits which include any solid-state
control modules should only be tested with a ten
megohm or higher impedance digital multimeter or
damage could occur to the module.
A DMM should be used instead of a test lamp in order to
test for voltage in high impedance circuits. While a test
lamp shows whether voltage is present, a DMM indicates
how much voltage is present.
The ohmmeter function on a DMM shows how much
resistance exists between two points along a circuit. Low
resistance in a circuit means good continuity.
IMPORTANT: Disconnect the power feed from the
suspect circuit when measuring resistance with a DMM;
this prevents incorrect readings. DMM’s apply such a
small voltage to measure resistance that the presence of
voltages can upset a resistance reading.
Diodes and solid-state components in a circuit can cause
a DMM to display a false reading. To find out if a
component is affecting a measurement, take a reading
once, then reverse the leads and take a second reading.
If the readings differ, the solid-state component is
affecting the measurement.
The following are examples of the various methods of
connecting the DMM to the circuit to be tested:
• Backprobe both ends of the connector, and either
hold the leads in place while manipulating the
connector or tape the leads to the harness for
continuous monitoring while you perform other
operations or test-driving.
• Disconnect the harness at both ends of the
suspected circuit where it connects either to a
component or to other harnesses.
1
2
Example Fault Code Sequences
1 Blink 2 Blinks 4 Blinks 4 Blinks 1 Blink
P = Pause
Fault Code 112:
1 Blink 1 Blink 1 Blink 2 Blinks 1 Blink
Fault Code 244:
MU5440