Atmospheric Pressure Sensor (Service Code 15)

Input Voltage Inspection

NOTE

O Be sure the battery is fully charged.

O The inspection is the same as “Input Voltage Inspection” of the throttle sensor and the inlet air pressure sensor.

• Turn the ignition switch OFF.

• Remove the ECU (see this chapter). Do not disconnect the ECU connectors.

• Connect a digital voltmeter [A] to the connector [B], with the needle adapter set.

Special Tool - Needle Adapter Set: 57001-1457

Atmospheric Pressure Sensor Input Voltage Connections to ECU Meter (+) -» BL lead (terminal 1)

Meter (-) -> BR/BK lead (terminal 14)

• Measure the input voltage with the engine stopped, and with the connectors joined.

• Turn the ignition switch ON.

Input Voltage at ecu

Standard: 4.75 - 5.25 V DC

• If the reading of input voltage is less than the standard range, check the ECU for its ground, and power supply (see this chapter). If the ground and power supply are good, replace the ECU.

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Atmospheric Pressure Sensor (Service Code 15)

• If the reading is within the standard range, remove the seat cover, and check the input voltage again at the sen- sor connector.

• Remove the air cleaner housing (see Air Cleaner Housing Removal).

• Disconnect the atmospheric pressure sensor connector and connect the harness adapter [A] between the main harness connector and pressure sensor connector.

• Connect a digital meter to the harness adapter leads.

[B] Atmospheric Pressure Sensor

Special Tool - Throttle Sensor Harness Adapter #2: 57001-1408

Atmospheric Pressure Sensor Input Voltage Connections to Sensor Meter (+) -> BL lead [C]

Meter (-) -> BR/BK lead [D]

• Measure the input voltage with the engine stopped, and with the connector joined.

• Turn the ignition switch ON.

Input Voltage at Sensor Connector Standard: 4.75 - 5.25 V dc

• If the reading is out of the standard range, check the wiring (see wiring diagram in this section).

• If the reading is good, the input voltage is normal. Check the output voltage.

• Turn the ignition switch OFF.

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Atmospheric Pressure Sensor (Service Code 15)

Output Voltage Inspection

• Measure the output voltage at the ECU in the same way as input voltage inspection. Note the following.

Digital Meter [A]

ECU Connector [B]

Atmospheric Pressure Sensor Output Voltage Connections to ECU

Meter (+) G/W lead (terminal 4)

Meter (-) -» BR/BK lead (terminal 14)

Output Voltage

Usable Range: 3.80 - 4.20 V DC at the standard

atmospheric pressure (101.32 kPa, 76 cmHg abs.)

NOTE

O The output voltage changes according to the local at- mospheric pressure.

O The atmospheric sensor output voltage is based on a nearly perfect vacuum in the small chamber of the sensor. So, the sensor indicates absolute atmospheric pressure.

• If the output voltage is within the usable range, check the ECU for its ground, and power supply (see this chapter). If the ground and power supply are good, replace the ECU.

• If the output voltage is far out of the usable range, remove the fuel tank, and check the output voltage at the sensor connector [A] (when the wiring is open, the output voltage is about 1.8 V).

• Connect a digital meter [A] to the harness adapter leads.

[B] Atmospheric Pressure Sensor

Special Tool - Throttle Sensor Harness Adapter #2: 57001-1408

Atmospheric Pressure Sensor Output Voltage Connections to Sensor Meter (+) -» G/W lead [C]

Meter (-) -» BR/BK lead [D]

Output Voltage at Sensor

Usable Range: 3.80 - 4.20 V DC at the standard

atmospheric pressure (101.32 kPa, 76 cmHg abs)

• If the output voltage is normal, check the wiring for conti- nuity (see next diagram).

• If the output voltage is out of the usable range, replace the sensor.

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Atmospheric Pressure Sensor (Service Code 15)

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2. Atmospheric Pressure Sensor

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• If you need to check the atmospheric pressure sensor for various altitudes other than sea level, check the output voltage as follows:

O Determine the local altitude (elevation). ^★

★ If you know the local atmospheric pressure using a barometer, substitute the atmospheric pressure for throt­tle vacuum pressure in the inlet air pressure sensor chart (see intake Air Pressure Sensor section in this chapter). And get the usable range of the atmospheric pressure sensor output voltage and check if output voltage is within the standard or not in the same way as Output Voltage Inspection of the inlet air pressure sensor.

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G/W

Atmospheric Pressure Sensor (Service Code 15)

Atmospheric Pressure/Altitude Relationship

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Crankshaft Sensor (Service Code 21)

Start the engine and switch the diagnosis mode to Dealer 1 mode to know all the problem that the DFI system has at the time of self-diagnosis. If the engine cannot be started, the self-diagnosis system does not detect dynamic condi­tion of the crankshaft sensor. In this case turn off the igni­tion switch and turn it on again to enter the Dealer 2 mode. In this mode the system tells all the troubles which the DFI system had in both static and dynamic conditions.

Crankshaft Sensor Removal/lnstallation

• See the Ignition System section in the Electrical System chapter.

Crankshaft Sensor Inspection

OThe crankshaft have no power source, and when the en­gine stops, the crankshaft generates no signals.

• Crank the engine and measure the peak voltage of the crankshaft sensor (see Electrical System chapter) in or­der to check the sensor.

• Check the wiring for continuity, using the following dia­gram.

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Camshaft Position Sensor (Service Code 23)

Start the engine and switch the diagnosis mode to Dealer 1 mode to know all the problem that the DFI system has at the time of self-diagnosis. If the engine cannot be started, the self-diagnosis system does not detect dynamic condi­tion of the camshaft position sensor. In this case turn off the ignition switch and turn it on again to enter the Dealer 2 mode. In this mode the system tells all the troubles which the DFI system had in both static and dynamic conditions.

Camshaft Position Sensor Removal/lnstallation The camshaft position sensor detects the position of the camshaft, and distinguishes the cylinder.

• See the Ignition system section in the Electric System chapter.

Camshaft Position Sensor Inspection O The camshaft position sensor have no power source, and when the engine stops, the camshaft position sensor gen­erates no signal.

• Crank the engine and measure the peak voltage of the camshaft position sensor (see Electrical System chapter) in order to check the sensor.

• Check the wiring for continuity, using the following dia­gram.

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1. ECU

2. Camshaft Position Sensor

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FUEL SYSTEM (DFI) 3-89

Speed Sensor Removal/lnstallation • See the Switches and Sensors section in teh Electrical System chapter.

Speed Sensor Inspection

• See the Switches and Sensors section in teh Electrical System chapter.

Input Voltage Inspection

NOTE

O Be sure the battery is fully charged.

• Turn the ignition switch OFF.

• Remove the fuel tank (see Fuel Tank Removal).

• Disconnect the speed sensor connector [A] and connect the harness adapter [B] between the harness connector and speed sensor connector.

• Connect a digital meter to the harness adapter leads. Special Tool - Throttle Sensor Setting Adapter:

57001-1400

Speed Sensor Input Voltage Connector to Sensor Meter (+) -> P lead [C]

Meter (-) -> BK lead [D]