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APPENDIX A: Troubleshooting a 12-7 Blink Code fault (SID-93 FMI-4) (SPN-0802 FMI-04)
Advanced In-Cab ECU
1) Remove X1, X2, X3 and X4 connector from the ECU.
2) Using X1-1 as the ground connection, check for resistance for the
entire X2 connector. There should be no resistance to ground found.
Please ll out attached worksheet.
3) Using X1-1 as the ground connection, check for resistance for X1-4
and X1-5. There should be no resistance to ground.
4) Using X1-1 as the ground connection, check for resistance for X3-4,
X3-6, X3-7, X3-9, X3-10, X3-13, X3-3 and X3-5. There should be
no resistance to ground. (Even if the vehicle is not congured for
6S/6M).
5) Using X1-1 as the ground connection, check for resistance for X4-6,
X4-9 and X4-12. There should be no resistance to ground.
6) Troubleshoot any pin that has resistance to ground. If no issues are
found continue to step 7.
7) Reconnect the X1 connector only and apply IGN power to the ECU
and using the DTC screen of Bendix
®
ACom
®
Diagnostics, clear all
DTCs. Re-check for any DTCs. If the 12-7 DTC is still present, the
problem is the Traction Solenoid Wiring or Solenoid.
8) If the 12-7 DTC does not reappear, remove power and connect the
X2 connector, reapply power, then clear all DTCs. If the 12-7 DTC
is no longer present, connect the X3 connector and clear all DTCs.
9) If at this point the 12-7 DTC is not present, the problem is with the
X4 connector.
For Peterbilt
®
& Kenworth
®
Trucks Only:
10) Clear all DTCs. If the 12-7 DTC reappears, the issue is on the
X4 connector. Otherwise, proceed to the next step.
11) Disconnect all modulators and the traction solenoid. Clear all
DTCs. If the DTC does not reappear, connect one modulator and
Traction Solenoid at a time, until the DTC reappears. Otherwise,
continue to the next step.
12) Make sure all modulators and the traction solenoid are
connected. Disconnect the ABS bulkhead connector at the
engine (top-left side) and remove Pins 1, 2, 11 &12. Reconnect
the connector and apply IGN power to the ECU. Using Bendix
ACom Diagnostics, clear all DTCs. If the 12-7 DTC returns, the
problem is either the wiring harness inside the cab or the ECU.
Record Resistances
Below:
X1-1 for ground point
X1 Pin Resistance
X1-4
X1-5
X2 Pin Resistance
X2-1
X2-2
X2-3
X2-4
X2-5
X2-6
X2-7
X2-8
X2-9
X2-10
X2-11
X2-12
X2-13
X2-14
X2-15
X2-16
X2-17
X2-18
X3 Pin Resistance
X3-4
X3-5
X3-6
X3-7
X3-8
X3-9
X3-10
X3-13
X4 Pin Resistance
X4-6
X4-9
X4-12
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