The useful service tips for Automotive technician. Content information about : 1) The Ignition Key: This is a special key with a resistor pellet on it. There are 15 different key blanks of this type, each with a different resistance value (refer to Table #1). 2) The Ignition Lock Cylinder: This cylinder looks and functions like a conventional lock cylinder, except for a set of contacts for the resistor pellet, and a pair of leads which connect to the vehicle’s wiring harness. Another method in diagnosing this system is by checking the voltage from the Decoder Module to the lock cylinder. Normally the Decoder Module output is approximately 5 volts. GM 6.5L DIESEL ENG.-NO START This tip applies to the 1994 and newer version that has the computer controlled diesel fuel injection system. The starting
system should be fully operational. Also, make sure the “Service Engine Soon” light is operational. FORD- IDM FAULT
CODES AFTER MODULE REPLACEMENT If you run across a Ford vehicle that has an IDM (Ignition Diagnostic Monitor) fault code, this tip may be helpful. Wiring Diagram #4, FORD VEHICLESIDLE PROBLEMS Ford vehicles with an Idle Air Control Motor (called IAC) that have idle problems and sometimes noise concerns can be diagnosed in the following
manner. For high idle problems, try unplugging the IAC motor.
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