4.1.1 If you are using a manual transmission, tape off and store the purple and pink
(brake switch) wires, the park neutral position plugs/ wires and the 13-position
(transmission) round connector in the tail section.
4.1.2 If you ARE going to use a 4L60E, 4L65E, 4L80E, or 4L85E transmission,
you must use the vehicle speed sensor (VSS), transmission connector, park neutral
position connectors and correct brake switch. These are necessary to make the
transmission work correctly. The brake switch should be closed (electrically connected)
when the brakes ARE NOT being applied and open (not electrically connected) when
the brakes ARE being applied. This is the opposite of a standard brake light switch. If
you are using a pressure brake switch, a SPDT relay must be installed to unlock the
converter when the brakes are applied. The vehicle speed sensor lets the computer
know how fast the wheels are turning. The park neutral position sensor tells the PCM if
the transmission is in park or neutral.
NOTE: Emission devices. This harness has provisions for the emission devices. We
have rolled up the canister purge and canister vent, air pump, and air bleed solenoid
wiring in the dash section. It may be left there if these items are not to be used. If you
plan on using these items route these wires out to the engine compartment.
4.2 YOU SHOULD GET TO KNOW THE PARTICULAR ENGINE YOU ARE USING:
NOTE: The 99–02 4.8L, 5.3L & 6.0L Vortec engines had four oxygen sensors
from the factory, but we have provisions for only two, one on the driver side
and one on the passenger side of the engine. We removed the two rear
oxygen sensors since they originally where behind the catalytic converters
and most people don’t want to run more than two oxygen sensors. This
system has two rectangular connectors at the computer. A 12200411
computer is required for proper operation.
4.2.1 PPPI recommends the use of the following parts. See Table 4.1. These will meet
all requirements and are compatible with PPPI harnesses. The numbers given are GM
and AC Delco part numbers. You must use the computer part #12200411.
4.2.2 Familiarize yourself with the harness by locating each of the harness groups and
by looking at the connectors on the wire ends.
4.2.3 Decide where and how the computer, fuse block, and relays will be mounted.
PPPI wire harness kits are designed to mount either under the dash or in the kick panel
on the right side.
4.2.4 A good exercise is to lay out the wire harness on the floor beside your vehicle
and identify all the connectors and wires.
4.2.5 You will want to route the harness through and around open areas. Inside edges
provide extra protection from hazards and also provide places for tie wraps, clips, and
other support.
4.2.6 Route the harness away from sharp edges, exhaust pipes, and the hood, trunk,
and door hinges.
4.2.7 Plan where harness supports will be located. Use a support approximately every
6 inches unless the harness routes under the floor carpet.
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