13.20
ELECTRICAL
below 392_F (200_C). Disconnected or Default temperature
is 1100_F (593_C).
INTAKE AIR TEMPERATURE SENSOR
Resistive sensor with resistive characteristics that change due
to temperature. The intake air temperature sensor is located in
the lower air intake. The ECU senses this change in resistance
and uses this information to correct fuel and/or timing based
on intake air temperature. In case of circuit failure ECU goes
to calibrated default air temperature. Default temperature is -
20_F (-28_C).
BAROMETRIC PRESSURE SENSOR
Internal ECU sensor that provides ECU with Altitude
information to adjust fuel and ignition. This sensor is located
in side the ECU and is not serviceable. Default setting is 28.74
inches of mercury.
CRANKSHAFT POSITION SENSOR (CPS)
The 5 tooth crank position sensor (A) picks up all 5 flywheel
teeth (C).
The 2 tooth crank position sensor (B) picks up 2 off set
flywheel teeth (D).
Both crank position sensors will have a gap (E) to the
flywheel pick up of.035" (.90mm).
These sensors must be in the correct position or the engine
will not run as expected. A sheared flywheel key will cause
the engine to not start or kill if running.
The 2 tooth pick up detects the crank angle and obtains
minimal information of the crank angle when control enters
into limp home mode.
5 tooth pickup is to obtain the following information in
combination with the 2 tooth pickup.
• Judge direction of rotation (forward and backward)
• Ignition advance angle control
• Injector drive angle control
• Excess advance ignition control at reverse
Table 13-13: Exhaust Temperature Sensor
Specifications
Resistance
Values
2.3MΩ @ 392_F (200_C) - 76Ω @
1652_F (900_C)
Table 13-14: Air Temperature Sensor
Specifications
Operating Temperature
Range
-22 _F - +248 _F (-30_C -
120_C)
Resistance 77_F(25_C) 9.7 - 10.3 KΩ
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