Click here to make tpub.com your Home Page

Page Title: CHART - 3 - ERRATIC PERFORMANCE AND NO CODES
Back | Up | Next

Click here for thousands of PDF manuals

Google


Web
www.tpub.com

Home


   
Information Categories
.... Administration
Advancement
Aerographer
Automotive
Aviation
Construction
Diving
Draftsman
Engineering
Electronics
Food and Cooking
Logistics
Math
Medical
Music
Nuclear Fundamentals
Photography
Religion
   
   

 

TM 9-2320-364-20-1
2-14. DDEC III/IV TROUBLESHOOTING (CONT).
Section IV. TROUBLESHOOTING CHARTS (Cont.)
D. CHART - 3 - ERRATIC PERFORMANCE AND NO CODES
-
This is a helpful hints chart. It assumes that you have received no codes, made all the basic mechanical checks first,
could not find the problem, and suspect the DDEC III/IV system to be at fault. Based on the particular symptom here's
what to look for:
SYMPTOM
WHAT TO LOOK FOR
1. Can't get full power.
Plugged fuel filters (para 4-13 and 4-17).
Hose not connected to Turbo Boost Sensor (TBS).
Verify injector calibration(s) are correct:
Remove rocker covers (para 3-4 and 3-5). Record the
injector calibration codes found on the injector load
plate for each injector. Compare the calibration
codes with those on the DDR FUEL INJECTOR CAL
display. Update calibration codes if necessary. See
Section V for additional details. Install rocker covers
(para 3-4 and 3-5).
2. Can't get full throttle.
Incorrect Throttle Position Sensor (TPS) counts. See
Step 21-4 for details (page 2-643).
Proper gapping of Timing Reference & Synchronous
3. Runs rough, misses and/or occasionally stalls.
Reference Sensors (TRS and SRS). See
Step C 2--8 (page 2-561) on how to check this.
Check for Fuel Leaks.
Loose battery power (ckt #240 or #241), ignition
(ckt #439), or ground (ckt #150) wires.
Check power contribution from each cylinder using
cylinder cut-out feature described in Diagnostic
Data Reader (DDR) instruction manual.
Check pulse wheel: missing teeth, damaged or
loose.
Check for signs of insulation wear on injector
harnesses.
Check calibration of Throttle Position Sensor (TPS)
4. Engine idles high (after warm-up) or slow
return to idle.
using procedure in Step 21-4 (page 2-643). You
may have a TPS or pedal problem.
Check vernier control signal line (ckt #525) for
short to voltage source.

Privacy Statement - Press Release - Copyright Information. - Contact Us

Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business