Mazda 2007 CX-9, Service Highlights, Page: 111 / 614

CONTROL SYSTEM [MZI-3.5]
01-40–7
01-40
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POWER STEERING PRESSURE (PSP) SWITCH FUNCTION [MZI-3.5]
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•
The PSP switch monitors the hydraulic pressure within the power steering system.
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POWER STEERING PRESSURE (PSP) SWITCH CONSTRUCTION/OPERATION [MZI-3.5]
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•
The PSP switch is a normally closed switch that opens as the hydraulic pressure increases.
•
The PCM provides a low current voltage on the PSP circuit.
•
The PCM uses the input signal from the PSP switch to compensate for additional loads on the engine by
adjusting the idle RPM and preventing engine stall during parking maneuvers. Also, the PSP switch signals the
PCM to adjust the transmission electronic pressure control (EPC) pressure during increased engine load, for
example, during parking maneuvers.
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NG: INTAKE AIR TEMPERATURE SENSOR
INTAKE AIR TEMPERATURE (IAT) SENSOR FUNCTION [MZI-3.5]
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•
Detects intake air temperature.
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INTAKE AIR TEMPERATURE (IAT) SENSOR CONSTRUCTION/OPERATION [MZI-3.5]
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•
The IAT sensor is built into the MAF sensor.
•
The IAT sensor is a thermistor device in which
resistance changes with temperature.
•
The electrical resistance of the thermistor
decreases as the temperature increases, and the
resistance increases as the temperature
decreases.
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NG: ACCELERATOR PEDAL POSITION SENSOR
ACCELERATOR PEDAL POSITION (APP) SENSOR FUNCTION [MZI-3.5]
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•
The APP sensor is an input to the powertrain control module (PCM) and is used to determine the torque
demand.
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ACCELERATOR PEDAL POSITION (APP) SENSOR CONSTRUCTION/OPERATION [MZI-3.5]
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•
There are 3 pedal position signals in the sensor.
•
APP sensor No.1 has a negative slope (increasing angle, decreasing voltage) and APP sensor No.2 and APP
sensor No.3 both have apositive slope (increasing angle, increasing voltage).
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NG: KNOCK SENSOR
MAF SENSOR
IAT SENSOR
ac9uun00000176
RESISTANCE
TEMPERATURE
HIGH
HIGH
ac9uun00000141
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