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Page Title: Table 2-12. DDEC II System Code Index
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TM 9-2320-364-20-1
2-11. TROUBLESHOOTING INSTRUCTIONS (CONT).
(d)
Diagnosis is built on codes that are displayed on the Diagnostic Data Reader (DDR) (Table 2-12).
Since the self-diagnostics do not detect all possible faults, the absence of a code does not mean
there are no problems in the system. If a DDEC problem is suspected (even in the absence of a
code), go to the DDEC II Troubleshooting (All Conditions) flowchart, (Para 2-13) or DDEC III/IV
Troubleshooting (All Conditions) flow chart Para 2-14. This chart can lead you to other charts
which can aid in the troubleshooting process.
(e)
If, after DDEC II or DDEC III/IV troubleshooting is completed and other symptoms remain, go to
Engine Troubleshooting.
(2)
Using the Diagnostic Data Reader (DDR).
(a)
Plug reader into truck connector and turn ENGINE switch ON.
Table 2-12. DDEC II System Code Index
Affected
Code
Sensor
Number
Description
11
Vernier Control
System on for 2 seconds with too low a voltage at the Vernier
Control input to the DDEC ECM.
12
Vernier Control
System on for 2 seconds with too high a voltage at the
Vernier Control input to the DDEC ECM.
14
Oil Temperature (OTS)
Engine running for 8 minutes with too high a voltage at the
OTS input to the DDEC ECM.
15
Oil Temperature (OTS)
Engine running for 2 seconds with too low a voltage at the
OTS input to the DDEC ECM.
21
Throttle Position (TPS)
System running for 2 seconds with too high a voltage at the
TPS input to the DDEC ECM.
22
Throttle Position (TPS)
System running for 2 seconds with too low a voltage at the
TPS input to the DDEC ECM.
23
Fuel Temperature (FTS)
Engine running for 8 minutes with too high a voltage at the
FTS input to the DDEC ECM.
24
Fuel Temperature (FTS)
Engine running for 2 seconds with too low a voltage at the
FTS input to the DDEC ECM.
25
NO CODES - No faults have been detected by DDEC since
the last time the codes were cleared.
32
ECM FAILURE - The backup system inside the DDEC ECM
has failed.
33
Turbo Boost (TBS)
Engine running (at less than 800 RPM or less than 30% of
maximum torque) for 5 seconds with too high a voltage at
the TBS input to the DDEC ECM.
34
Turbo Boost (TBS)
Engine running for 2 seconds with too low a voltage at the
TBS input to the DDEC ECM.
35
Oil Pressure (OPS)
Engine running for 2 seconds at less than 800 RPM with too
high a voltage at the OPS input to the DDEC ECM. Oil
temperature must be greater than 60 degrees C to log this
code.
36
Oil Pressure (OPS)
Engine running for 2 seconds with too low a voltage at the
OPS input to the DDEC ECM.
2-100

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