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Section 8
Appendixes
Section 8Append ixe s
Appendix A
Expert Mode Diagnostics
When you use Expert Mode diagnostics, the blink
code lamp identifies and displays existing and
intermittent faults consecutively in three-digit fault
code sequences, with a short pause between each
fault. Refer to Expert Mode Blink Code Example
(4S/2M Configuration) and Table J — Expert Mode
Fault Code, all in this section.
Expert Mode identifies:
앫 System configuration
앫 Components that need repair;
앫 Cause (or type) of fault, such as a cut sensor
cable; and
앫 Number of times a fault has occurred.
The ECU stores intermittent and existing faults
into memory in the order in which they occur.
However, the blink code lamp displays the most
recent fault first.
How to Test for Intermittent Stored Faults
Using the Expert Mode
Before you use Expert Mode diagnostics, be
prepared to count and write down the blink code
lamp flashes for each fault.
1. The vehicle must be stationary to activate the
blink code. Power the ECU with a minimum of
12 volts DC (9.5–14 is an acceptable range). The
warning lamp on the trailer will come ON.
2. Identify the fault. If not already attached, plug
the diagnostic tool into the diagnostic cable
socket usually located on the right side of
the trailer.
앫 For an alternate blink code access procedure,
see “Warning Lamp Diagnostics” in
Appendix C.
앫 You can restart the Expert Mode fault sequence
at any time by depressing the blink code lamp
switch as described in Step 3 below.
3. Depress the blink code lamp switch located in
the diagnostic tool two times for one second
each time as follows:
a. Depress the blink code lamp switch once
for one second. The lamp will come ON.
b. Release the switch. The blink code lamp
will go OFF.
c. Depress the blink code lamp switch once
for one second. The blink code lamp will
come ON.
d. As soon as the blink code lamp comes ON,
release the blink code button.
4. Determine whether or not there are
Intermittent Stored faults in the system.
If there are no Intermittent Stored faults, the
blink code lamp will come back ON and
identify the system configuration one time
by displaying:
– 2 Flashes = 4S/3M
– 3 Flashes = 4S/2M
– 4 Flashes = 2S/2M
– 5 Flashes = 2S/1M
After the blink code lamp displays the system
configuration once, the lamp will remain OFF.
If There Are Intermittent Stored Faults in
the System
1. The blink code lamp will come back ON and
identify the system configuration one time
by displaying:
– 2 Flashes = 4S/3M
– 3 Flashes = 4S/2M
– 4 Flashes = 2S/2M
– 5 Flashes = 2S/1M
2. The blink code lamp will go OFF for
2.5 seconds, come back ON for 2.5 seconds,
and go OFF for 2.5 seconds.
앫 The blink code lamp will display the most
recent fault in a three-digit fault code
sequence. For example, a fault code
sequence of 3-5-2 reads as follows:
3. The blink code lamp will then go OFF for
2.5 seconds, then display each remaining fault
code sequence.
4. When all fault code sequences have been
displayed, the blink code lamp will come ON
and go OFF, and remain OFF.
First Digit 3 Flashes = Sensor BU1
Second Digit 5 Flashes = Cut Sensor Cable
Third Digit
(X)
2 Flashes = Number of
= Fault Occurrences
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