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DIAGNOSTIC STATUS CODES
IT TRANSISTOR CONTROL
Do not loop level L signal wires around level H, level
MP, or HP wires.
4.2.5 RF Interference
To prevent radio frequency (RF) interference, care
should be taken in routing power cables in the vicinity
of radio-controlled devices.
Section 4.2.6 Suppression
Unless specifically noted otherwise, suppression (for
example, a snubber) is required on all inductive
devices controlled by an output. This suppression
minimizes noise and prevents damage caused by
electrical surges.
Section 4.3 Recommended Lubrication of Pins
and Sockets Prior to Installation
Beginning in January of 1999, GE will implement the
addition of a lubricant to all connections using pins
and sockets on EV100/EV200 and Gen II products.
Any connection made by GE to the A, B, X, Y, or Z
plugs will have the lubricant NYE 760G added to
prevent fretting of these connections during vehicle
operation.
Fretting occurs during microscopic movement at the
contact points of the connection. This movement
exposes the base metal of the connector pin which,
when oxygen is present, allows oxidation to occur.
Sufficient build up of the oxidation can cause
intermittent contact and intermittent vehicle
operation. This can occur at any similar type of
connection, whether at the control or in any
associated vehicle wiring, and the resultant
intermittent contact can provide the same fault
indication as actual component failure.
The addition of the NYE 760G lubricant will prevent
the oxidation process by eliminating the access of
oxygen to the contact point. GE recommends the
addition of this lubricant to the 12 pin and 23 pin
plugs of all new Gen II controls at the time of their
installation into a vehicle
When servicing existing vehicles exhibiting
symptoms of intermittent mis-operation or shutdown
by the GE control, GE recommends the addition of
this lubricant to all 12 and 23 pin plugs, after proper
cleaning of the connectors, as a preventative
measure to insure fretting is not an issue before GE
control replacement. Also, for long term reliable
control operation, the plug terminals must be
maintained per these instructions with the
recommended contact cleaner and lubricant which
provides a high degree of environmental and fretting
protection.
New and re-manufactured control plugs are cleaned
and lubricated prior to shipment from the factory.
However, in applications where severe vibration or
high temperature cycling and excessive humidity (
such as freezers ) are present, it is recommended
that the plug terminals be cleaned and lubricated
every year, per this instructions. In normal
applications, plug maintenance should be performed
every two years, unless intermittent problems arise
with the plugs, requiring more immediate attention.
Warning: Do not use any other cleaners or
lubricants other than the ones specified.
WARNING: Before conducting maintenance on
the vehicle, jack up the drive wheels, disconnect
the battery and discharge the capacitors.
Consult the Operation and Service Manual for
your particular vehicle for details on discharging
the capacitors; this procedure differs between
SCR and Transistor controls.
1. Disconnect plug from controller or mating plug.
2. Locate the plug that contains the socket (female)
terminals. Maintenance needs only to be
performed on the plug containing the socket
(female) type terminals. Reconnecting the plugs
will lubricate the pin (male) terminals.
3. Clean each terminal using Chemtronics contact
cleaner "Pow-R-WasH CZ " as shown in Figure
1.
Figure 1
4.
Lubricate each terminal using Nye 760G
lubricant as shown in figure 2. Apply enough
lubricant to each terminal opening to completely
fill each opening to a depth of .125" maximum.
Page 16
November 2005
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