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no edit summary
Specific information on the Detroit Diesel Electronic Control (DDEC) Generation I
Specific information on the Detroit Diesel Electronic Control (DDEC) Generation I
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== DDEC I Schematics ==
[[File:DDEC I Schematic Diagram.png|thumb|DDEC I Schematic Diagram|alt=|600x600px]]This system utilizes an engine mounted EDU and a cab mounted ECM, which has a replaceable Programmable Read-Only Memory (PROM). The EDU functions as the high current switching unit for the actuation of the injector solenoids and is fuel-cooled.
The DDEC I ECM is a microprocessor. It is the control center of the DDEC I system.
The DDEC I ECM is packaged in a die-cast aluminum housing with sealed connectors.
The DDEC I system consists of the following:
* The DDEC I ECM
* A replaceable PROM
* Connections to various engine sensors, operational displays, power and fuel injectors
DDEC I controls the timing and amount of fuel injected into each cylinder. The system also monitors several engine functions using various sensors that send electrical signals to the main Electronic Control Module (ECM). The ECM uses this information to send a command pulse to the Electronic Distributor Unit (EDU). The EDU functions as the high current switching unit for actuation of the Electronic Unit Injector (EUI) solenoids. The ECM also has the ability to limit or shut down the engine completely (depending on option selection) in the case of damaging engine conditions, such as low oil pressure, low coolant level, or high oil temperature.
== Owner Notes ==
=== Throttle Position Sensor (BB35 drawing coordinates) ===
* Wire 416A to L1 (AMP CONNECTOR)
* Wire 416 to ECM Module (in rear closet road side)
* Wire 417 to ECM Module (in rear closet road side)
* Wire 452B to High Idle Resistors (K5 drawing coordinates)
=== JIA ECM Module Connector ===
* Wire 416 to TPS
* Wire 417 to TPS
* Wire 452 goes to High Idle Resistors (K5 drawing coordinates)
=== ECU Relay Oil Pressure Switch ===
* Wire 265 to ECU DIODES
* Wire 258A to ECU RELAY terminal 87
=== HIGH IDLE RESISTORS (K5 drawing coordinates) ===
* Wire 452 to connector J1A ECM MODULE
* Wire 452A to EDU (Electronic Distribution Unit)
* Wire 452B to THROTTLE POSITION SENSOR (BB35 drawing coordinates)
=== ECU DIODES ===
* Wire 255 Red to K18 (dwg coord) CHECK TRANSMISSION RELAY
* Wire 259 Yellow to R18 (dwg coord) ECU RELAY
* Wire 266 Gray to (B25 dwg coord) 20A breaker
It appears the ECM used in the DDEC I used Motorola components and some OTS (Off The Shelf) hardware used in late 80s GM vehicles.
== Oil & Pressure Sensor Locations ==
{| class="wikitable"
{| class="wikitable"
|+
|+
|[[File:8v92 Oil Pressure & Temperature Sensor .png|none|frame|Oil Temperature and Pressure Sensor ]]
|[[File:8v92 - Oil Pressure Sensor.png|center|thumb|Oil Pressure Sensor ]]
|[[File:8v92 DDECI Turbo Boost Sensor.png|none|thumb|Turbo Boost Sensor]]
|
|-
|Oil gauge temperature sensor on my coach is on top of the oil filter and the Dash Oil Pressure Gauge sender and low oil pressure sensor is mounted to the lower rear frame curb side adjacent to the muffler. The Kysor LOW OIL PRESSURE SENSOR 3 lb. is associated with the Check
Transmission Light as well as a secondary power source for the ECU Relay. There is a 24" oil hose connected to the rear oil gallery above the starter which feeds the sensors.
|The above oil pressure sensor is for the ECM Computer only. Road side near transmission
|
|
|}
== Troubleshooting ==
=== DDEC I Trouble Codes ===
{| class="wikitable"
!Code
!Code
!Description
!Description
|-
|-
|13
|13
|'''Coolant Level Loq''' - System running for 2 seconds with a low sensor output (voltage).
|'''Coolant Level Low''' - System running for 2 seconds with a low sensor output.
|-
|-
|14
|14
|'''Low Oil Temperature''' - Engine running for 8 minutes with a very cold (less than 0° C) oil temperature indication.
|'''Low Oil Temperature''' - Engine running for 8 minutes with a very cold (less than 0° C) oil temperature indication.
|-
|-
|-
|-
|22
|22
|'''Low Throttle Position''' - System running for 2 seconds with too low a throttle position indicated.
|'''Low Throttle Position''' - System running for 2 seconds with too low a throttle position indicated.
|-
|-
|25
|25
|'''Low Oil Pressure''' - Engine running wf th the 011 pressure less than the limit (different limits at different RPM's) for 7 seconds. This fault will cause both the "Stop Engine<nowiki>''</nowiki> and "Check Engine" light to turn on, and will power down (and eventually shutdown) the engine if the engine protection system is equipped with the shutdown feature.
|'''Low Oil Pressure''' - Engine running wf th the 011 pressure less than the limit (different limits at different RPM's) for 7 seconds. This fault will cause both the "Stop Engine<nowiki>''</nowiki> and "Check Engine" light to turn on, and will power down (and eventually shutdown) the engine if the engine protection system is equipped with the shutdown feature.
|}
|}
=== [http://wanderlodge.wiki/images/8/89/DDEC_I_TroubleShooting_Guide.pdf DDEC I Troubleshooting Guide Download] ===