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This chapter provides troubleshooting procedures to help isolate problems in the in-
strumentation to a specific part.
Until you become familiar with the system, it is always best to begin troubleshooting
with Section 5.2.
Note - If you cannot find the problem after following the procedures in this chap-
ter, please call the AMETEK Dixson Heavy Duty Service Department. Free
telephone assistance is available between 7 a.m. and 5:30 p.m. MST, Mon-
day through Thursday, or between 7:00 a.m. and 12:00 p.m. Fridays. The
toll-free number is (800) 205-7710.
•
Volt-ohmmeter capable of reading from 0 to 20 DC volts, and resistance.
•
Air pressure gauge that is known to be accurate to 150 psi. The gauge
must have adapter fittings to allow it to be installed between the pressure
hose and the Interface Module.
•
Hand-held vacuum pump with a gauge that is known to be accurate from
0 to 20 inches of mercury (Hg) (for testing Vacuum Transducer Modules).
•
HDT (hand-held diagnostic tool, described in Chapter 6 of this manual).
•
Engine diagnostic tool that can read the J1708 data bus and check Engine
ECU operation.
•
Jumper wire.
•
-watt, 1% tolerance resistors of the following values: 33.2 ohms, 47.5
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ohms, 28 ohms, 237 ohms, and 392 ohms to check various gauges. The
Model RS-200 Resistance Substitute (a decade resistance box rated at
watt with 1% tolerance) can be used in place of individual resistors. It is
manufactured by IET Labs, Inc. in Westbury, NY (1-800-899-8438).
•
Voltage/current calibrator (optional) - a calibrated millivolt source can be
helpful in troubleshooting the pyrometer due to the low operating volt-
ages in the pyrometer circuitry. An example is the Model IVC-222HPII
Current/Voltage Calibrator manufactured by Martel Electronics in
Windham, NH (800-821-0023).
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