F. GROUND (mandatory) - These circuits are used to provide ground for the
various devises. Connect these wires under a bolt in the engine block,
transmission, or cylinder head. These are the grounds for the entire injection
system. For best results from your EFI system, be certain your grounding
surfaces are clean and your connections are secure.
G. INJ #1 - #8 – The Multec 2 fuel injector assembly is a solenoid operated
device, controlled by the PCM that meters pressurized fuel to a single engine
cylinder. An injector that has been sitting for more than 6 months will need to be
cleaned/ replaced as the varnish residue in the fuel will cause the injector to stick
closed. This will keep the injector from delivering fuel as needed by the injection
system. See Figure 7.12 & 7.13
H. KNOCK – To control spark knock, a Knock Sensor (KS) system is used. This
system is designed to retard spark timing up to 20 degrees to reduce spark
knock in the engine. This allows the engine to use maximum spark advance to
improve drivability and fuel economy. See Figure 7.7
I. LEFT & RIGHT O2 SEN.– The PCM uses the signal voltage from heated oxygen
sensors in a Closed Loop to adjust the fuel injector pulse width. In Closed Loop,
the PCM adjust fuel delivery to maintain an air to fuel ratio which allows the best
combination of emission control and drivability. See Figure 7.8
J. MAF-IAT – The Mass Air Flow (MAF) sensor measures the amount of air which
passes through the sensor. The PCM uses this information to determine the
operating condition of the engine in order to control the fuel delivery. A large
quantity of air indicates acceleration. A small quantity of air indicates
deceleration or idle. See Figure 7.16
K. MAP– The Manifold Absolute Pressure (MAP) sensor responds to changes in the
intake manifold pressure as a result of engine load and speed. The map sensor
converts this to a voltage output. See Figure 7.9
L. TAC MOTOR- The TAC Motor is responsible for the movement of the throttle
body blade. It receives signal from the TAC Module, according to the accelerator
pedal position the TAC Module sees. See Figure 7.15
N. STARTER B+- These circuits are used to maintain memory in the PCM and
provide power to all heavy amp circuits. Connect these wires to the battery post
on the starter solenoid (the same post as the positive battery cable) or to a
positive high output battery source.
O. TPS –
The TP sensor attaches to the side of the throttle body opposite the TAC
motor. The TP sensor senses the throttle blade angle and relays that information
to the control module. The control module requires knowledge of throttle angle
in order to generate the required injector control signals, or pulses. See Figure
7.14
11
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