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TM 9-2320-360-20-1
2-13. INTRODUCTION TO LOGIC TREE TROUBLESHOOTING (CONT)
NOTE
Chart is used only when a DDEC problem is suspected but no codes are displayed
on DDR or codes are intermittent.
Table 2-6. DDEC Troubleshooting (No Codes on DDR)
KEY SYMPTOM
No codes on DDR
SECONDARY SYMPTOMS
PAGE
CHECK ENGINE indicator on and code 25 on DDR..........................................................................2-94
CHECK ENGINE indicator always on, no data link, codes not flashing................................................2-98
CHECK ENGINE indicator does not light when ENGINE switch is positioned to ON ............................2-282
Engine cranks but will not start ........................................................................................................2-292
No DATA link and bulb check OK.....................................................................................................2-314
DDR displays intermittent code ........................................................................................................2-326
CHECK GAUGES indicator always on and code 25 on DDR..............................................................2-330
No CHECK GAUGES indicator during bulb check .............................................................................2-334
Power take off high idle not working.................................................................................................2-340
Engine brake is always on ...............................................................................................................2-348
Engine brake not working................................................................................................................2-354
f.
Contact Test Set (CTS)
The troubleshooting for the HET M1070 Tractor was developed utilizing the Digital Data
Reader (DDR) and Simplified Test Equipment for Internal Combustion Engines
(STE/ICE-R). Since the initial publication of this manual, the Contact Test Set (CTS) has
been developed for use as the primary Test, Measurement, and Diagnostic Equipment
(TMDE) for the HET M1070, in place of the DDR and STE/ICE-R.
The CTS J1708 programming performs the sarie function as the DDR and the CTS/ICE
programming performs the same tests as the STE/ICE-R unit The procedural steps
contained within this manual still reflect the original test equipment, however, the CTS
can be used to troubleshoot the vehicle. The same test results will be obtained using
either piece of test equipment.
Some of the detailed test procedures shown on the right-hand pages of the
troubleshooting will deviate slightly from the steps required to operate the CTS. For
additional information on CTS operating procedures and individual test instructions, refer
to the information provided with the CTS unit.
2-78 Change 1
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