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TM 9-2320-360-20-3
Section 4
TROUBLESHOOTING CHARTS
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 Ill 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.
2. Can’t get full throttle.
3. Runs rough, misses and/or occasionally stalls.
4. Engine idles high (after warm-up) or slow
return to idle.
Hose not connected to Turbo Boost Sensor (TBS).
Verify injector calibration(s) are correct:
Remove rocker covers (para 3-2). 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 5 for additional details. Install rocker covers
(para 3-2).
Incorrect Throttle Position Sensor (TPS) counts. See
Step 21-4 for details (page H-139).
Proper gapping of Timing Reference & Synchronous
Reference Sensors (SRS and TRS). See Step C 2-8
(para H-47) 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)
using procedure in Step 21-4 (page H-139). You
may have a TPS or pedal problem.
Check vernier control signal line (ckt #525) for
Short to voltage source.
I
H-63
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