Dakota Quad Cab 2WD V8-5.9L VIN Z LDC (2002)
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Transmission Control Module
Each module provides its own bias and termination in order to transmit and receive messages. The bus voltage is at 0 volts when no modules are
transmitting and is pulled up to about 7-1/2 volts when modules are transmitting.
The bus messages are transmitted at a rate averaging 10800 bits per second. Since there is only voltage present when the modules transmit and the
message length is only about 500 milliseconds, it is ineffective to try and measure the bus activity with a conventional voltmeter. The preferred
method is to use the DRB III lab scope. The 12v square wave selection on the 20-volt scale provides a good view of the bus activity. Voltage on the
bus should pulse between 0 volts and about 7-1/2 volts. Refer to the following figure for some typical displays.
The PCI Bus failure modes are broken down into two categories. Complete PCI Bus Communication Failure and individual module no response.
Causes of a complete PCI Bus Communication Failure include a short to ground or battery on the PCI circuit. Individual module no response can be
caused by an open circuit at either the Diagnostic Junction Port or the module, or an open battery or ground circuit to the affected module.
Symptoms of a complete PCI Bus Communication Failure would include but are not limited to:
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All gauges on the EMIC stay at zero
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All telltales on EMIC illuminate
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EMIC backlighting at full intensity
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Dashed lines in the Compass Mini-Trip Computer display
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No response received from any module on the PCI bus (except the PCM)
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No start (if equipped with Sentry Key Immobilizer)
Symptoms of Individual module failure could include any one or more of the above. The difference would be that at least one or more modules would
respond to the DRB III.
Diagnosis starts with symptom identification. If a complete PCI Bus Communication Failure is suspected, begin by identifying which modules the
vehicle is equipped with and then attempt to get a response from the modules with the DRB III. If any modules are responding, the failure is not
related to the total bus, but can be caused by one or more modules PCI circuit or power supply and ground circuits. The DRB III may display "BUS
+/- SIGNAL OPEN" or "NO RESPONSE" to indicate a communication problem. These same messages will be displayed if the vehicle is not
equipped with that particular module. The CCD error message is a default message used by the DRB III and in no way indicates whether or not the
PCI bus is operational. The message is only an indication that a module is either not responding or the vehicle is not equipped.
Vehicle Theft Security/System
VEHICLE THEFT SECURITY SYSTEM
The VTSS system monitors the door ajar switches, and ignition switch to detect unauthorized entry into the vehicle. Once the vehicle is "armed", any
one of these inputs can cause the VTSS system to be tripped. Once tripped, the horn and lights will pulse for 3 minutes and if an attempt is made to
start the engine with a non-programmed SKIM key, it will start and stall. If the trigger condition is still present, the lights will continue to flash for an
additional 15 minutes, after which the system will stop pulsing the lights and return to the "armed" state. The cause of the last 4 alarm triggers is
stored by the CTM and may be retrieved by the DRB III. The system may be disarmed by either an unlock command from a valid RKE key fob by
using a key in either door, or by using a valid SKIM key in the ignition. The door key cylinders are equipped with disarm switches. There is also a
VTSS lamp on the dash that provides information to the driver about the state of the vehicle theft system.
Windshield Wiper System
WINDSHIELD WIPER SYSTEM
The AN or AN84 truck utilize speed sensitive intermittent wipers. The low and high speeds are controlled through the wiper stalk switch. The
intermittent portion of the wiper control is handled by the CTM through the intermittent wiper relay. When the module detects a decrease in delay time
as selected by the driver, an immediate wipe of the windshield takes place and the new delay interval is implemented.
