1C-4 Engine Electrical Devices:
MAP Sensor
The MAP sensor is installed on the intake manifold and
used to detect the intake manifold pressure.
This sensor inputs the intake manifold pressure to the
ECM as a voltage value.
This input signal is used as the fundamental signal to
determine fuel injection duration, ignition timing, etc.
Throttle Position Sensor (TPS)
The TPS is installed on the throttle body and detects the
degree of throttle opening. The throttle shaft is
interlocked with the TPS shaft.
This sensor is a variable resistor, changing resistance
(Ohms) in accordance with the throttle opening.
The varying resistance value is converted to voltage and
input to the ECM.
Based on the TPS voltage, the ECM calculates the idle
and throttle opening positions to determine the control
modes of the various controls systems (Idle air control,
fuel injection control system, etc.).
Neutral Switch
The neutral switch is installed on the clutch lever holder
and is used to detect the shift position.
This switch is “ON” in neutral and “OFF” in forward or
reverse.
The ECM performs the following control based on the
neutral switch signal:
• When the shift lever is in forward or reverse at the
time of engine start, the ECM will not supply power to
the starter motor relay, thus preventing starter motor
engagement.
(Start-in-gear protection. Refer to “Start-In-Gear
Protection System Description” in Section 1I (Page 1I-
2).)
Shift Position Sensor (SPS)
The SPS is installed on the clutch lever holder and
detects the shift position. The clutch lever is interlocked
with the SPS shaft.
This sensor is a variable resistor that changes resistance
(Ohms) in accordance with the shift position.
The varying resistance value is converted to voltage and
input to the ECM.
Based on the SPS voltage, the ECM determines the shift
position and executes the following controls.
• When the shift lever is in neutral, fuel injection is
controlled to prevent engine speed from exceeding 3
000 r/min.
• After shifting into forward or reverse from neutral, the
IAC valve is controlled to increase intake air to
prevent unstable engine idle or stalling.
1. MAP sensor
1. TPS
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1. Neutral switch
1. SPS
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