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TM 9-2320-360-20-3
Section 3
TESTING THE DDEC III SYSTEM
A. TOOLS NEEDED TO DIAGNOSE THE SYSTEM
The following tools and equipment are required to properly diagnose a complete system:
MPSI - PROLINK Diagnostic Data Reader (DDR) - J38500-750 (cartridge only).
Duetsch 6-pin DDR Adapter - J38500-60A
Voltmeter and Ohmmeter: Use a digital volt-ohmmeter J-34029 or equivalent to measure voltage and resistance where
required. A digital volt-ohmmeter must be used when specified in a procedure.
Test Light 6V: Must be used when specified in the procedure.
Jumper Wires: To bypass a circuit and to insert between special connectors. This will permit access to the connector termi-
nals for circuit checking.
TRS/SRS Alignment Tool: J-39815.
.020” Feeler Gauge
Crankshaft Position Timing Tool: J34930-A
B. DIFFERENCES BETWEEN DDEC Ill AND DDEC II
To those thoroughly familiar with DDEC II, an outline is given of the differences in DDEC Ill. From an installation and testing
viewpoint, these differences are:
DDEC fault codes are still able to be “flashed”, but with DDEC III, a diagnostic request switch has been installed. There are
no longer provisions to use a jumper wire. The DDC assigned fault codes no longer appear on the "MPSI” diagnostic data
reader.
When using the MPSI DDR, the diagnostic codes are now displayed In a SAE J1587 format. The SAE have devel-
oped a standardized list of Parameter Identification Descriptions (PID), and a System identification Description
(SID). These PlDs and SID will define the area where the fault has occurred. Followlng the PID or SID will be a
Failure Mode Identifier (FYI). The diagnostlc codes (both DDEC and SAE) and their description can be found in
Section 4 of this Troubleshooting Guide.
Fault codes are now referred to as active and inactive.
DDEC III requires injector calibrations to be entered into the EEPROM with the DDR. DDEC III uses this information to
provide proper cylinder balancing.
for different cylinder location.
Injector information must be programmed whenever an injector is replaced, or changed
DDEC III engines are equipped with a 36 tooth pulse wheel, instead of DDEC II’s 13 tooth pulse wheel.
Added information now appears for some fault codes. This data includes: the hour the code is first logged, last logged,
number of occurrences, number of overrides (if applicable), and the value that caused the fault to be logged (if applicable).
Refer to code 85 page H-239 for details.
H-10
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