C 1500 Truck 2WD V8-6.5L DSL Turbo VIN F (1998)
include any equipment which is not connected to the electrical system of the vehicle such as portable telephones and radios. Therefore, the first step in
diagnosing any Powertrain problem is to eliminate all of the Aftermarket electrical equipment from the vehicle. After this is done, if the problem still
exists, diagnose the problem in the normal manner.
ENGINE CONTROLS INFORMATION
The driveability and emissions information describes the function and operation of the control module. The emphasis is placed on the diagnosis and
repair of problems related to the system.
Engine Components, Wiring Diagrams, and Diagnostic Tables (DTCs):
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The Component Locations
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The Wiring Diagrams
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The Control Module Terminal End View and Terminal Definitions
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The On-Board Diagnostic (OBD) System Check The Diagnostic Trouble Code Tables (DTCs)
The Component System includes the following items:
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The Component and circuit description
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The On-vehicle service for each subsystem
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The Functional checks with the Diagnostic Tables
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How To Use Electrical Systems Diagnostic Information
The DTCs also contain the diagnostic support information containing the circuit diagrams, the circuit or the system information, and helpful diagnostic
information.
WIRING HARNESS SERVICE
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The control module harness electrically connects the control module to the various solenoids, switches, and sensors in the vehicle engine room and
passenger compartment.
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Replace the wire harnesses with the proper part number replacement. When splicing signal wires into a harness, use the wiring that has high
temperature insulation.
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Consider the low amperage and voltage levels utilized in the Powertrain control systems. Make the best possible bond at all splices. Use rosin-core
solder in these areas.
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Molded-on connectors require complete replacement of the connector. Splice a new connector into the harness. Replacement connectors and
terminals are listed in Group 8.965 in the Standard Parts Catalog.
CONNECTORS AND TERMINALS
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In order to prevent shorting between opposite terminals, use care when probing a connector and when replacing terminals. Damage to the
components could result.
CAUTION: Always use jumper wires between connectors for circuit checking.
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Never probe through the Weather-Pack seals. Use the tachometer adapter J 35812, or the equivalent, which provides a convenient connection to
the tachometer lead. The connector test adapter kit J 35616, or the equivalent, contains an assortment of flexible connectors used in order to probe
the terminals during the diagnosis. The fuse remover and the test tool BT-8616, or the equivalent, is used for removing a fuse and to adapt the fuse
holder to a meter for diagnosis.
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Open circuits are often difficult to locate by sight because oxidation or terminal misalignment are hidden by the connectors. Merely wiggling a
connector on a sensor or in the wiring harness may temporarily correct the open circuit. Oxidized or loose connections may cause intermittent
problems.
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Be certain the type of connector and terminal before making any connector or terminal repair. Weather-Pack and Com-Pack Ill terminals look
similar, but are serviced differently.
