Kawasaki Z400 - Service manual > Intake Air Pressure Sensor (Service Code 12) (DTC P0105, P0106, P0107)

Intake Air Pressure Sensor Removal

NOTICE

Never drop the Intake air pressure sensor especially on a hard surface. Such a shock to the sensor can damage it.

• Remove: Air Cleaner Housing (see Air Cleaner Housing Removal)
• Disconnect: Intake Air Pressure Sensor Connector [A]
• Remove the intake air pressure sensor; [B] from the bracket [C].

• Disconnect the vacuum hose [A].
• Remove the rubber damper [B] from the intake air pressure sensor [C].

Intake Air Pressure Sensor Installation

• Installation is the reverse of removal.
• Position the intake air pressure sensor [A] between the projections [B] on the rubber damper.

Install the  rubber damper [A] on the bracket [B]

Intake Air Pressure Sensor Input Voltage Inspection

NOTE

Be sure the battery is fully charged

• Turn the ignition switch off.
• Remove: Air Cleaner Housing (see Air Cleaner Housing Removal)
• Disconnect the intake air pressure sensor connector and connect the measuring adapter [A] between these connectors..

Main Harness [B]

Intake Air Pressure Sensor [C]

Special Tool - Measuring Adapter 57001-1700

• Connect a digital meter [D] to the measuring adapter leads.

Intake Air Pressure Sensor Input Voltage

Connections  to Adaptec:

Digital  Meter (+) → R (sensor BL) lead

Digital Meter (-) → BK (sensor BR/BK) lead

• Measure the input voltage with the engine stopped and with the connector pined.
• Turn the ignition switch on.

Input Voltage

Standard: DC 4.75 ~ 5.25 V

• Turn the ignition switch off.

If the reading is within the standard, check the output voltage (see Intake Air Pressure Sensor Output Voltage Inspection).

If the Wing is out of the standard, remove the ECU and check the wiring for continuity between main harness connectors.

Disconnect the ECU and sensor connectors.

Wiring Continuity Inspection

ECU Connector [A) ←→Intake Air Pressure, Sensor Connector [B]

ECU Terminal 10 [C] ←→ Sensor Terminal [D]

ECU Terminal 28 [E] ←→ Sensor Terminal [F]

If the wiring is good, check the ECU for b ground and power supply (see ECU Power Supply Inspection).

If the ground and power supply are good, replace the ECU (see ECU Removal/Installation).

Intake Air Pressure Sensor Output Voltage Inspection

Measure the  Output voltage at the intake air pressure sensor in the same way as input voltage Inspection, note the following.

Disconnect the intake air pressure sensor connector and connect the measuring adapter [A] between these connectors.

Main Harness [B]

Intake Air Pressure Sensor [ C]

Digital Meter [D]

Special Tool - Measuring Adapter: 57001-1700

Intake Air Pressure Sensor Output Voltage

Connections to Adapter:

Digital Meter (+)→ Y (sensor Y/BL) lead

Digital Meter (-) → BK  (sensor BR/BK) lead

• Measure the output voltage with the engine stopped and with the connector joined.
• Turn the ignition  switch on.

NOTE

The output voltage changes according to the local atmospheric pressure

• Turn the ignition switch off.

lf the reading is out of the  usable range, replace the sensor (see Intake Air Pressure Sensor Removal/Installation).

If the reading is within the usable range, remove the ECU and check the wiring for continuity between main harness connectors.

• Disconnect the ECU and sensor connectors.

Wiring Continuity Inspection

ECU  Connector [A]←→ Intake Air Pressure Sensor Connector [B] ECU Terminal 8 [C] ←→Sensor Terminal [D] ECU Terminal  28 [E]←→ Sensor Terminal [F]

If the wiring is good, check the sensor for various vacuum.

• Remove the intake air pressure sensor [A] and disconnect the vacuum hose from the sensor.
• Connect an auxiliary hose [B] to the intake air pressure sensor.
• Temporarily install the intake air pressure sensor.

Connect a digital meter [C], vacuum gauge [D], the fork oil level gauge [E] and the measuring adapter to the intake air pressure sensor.

Special Tools - Fork Oil Level Gauge: 57001-1290

Vacuum Gauge: 57001-1369

Measuring Adapter: 57001 -1700

Intake Air Pressure Sensor Output Voltage

Connections to Adapter:

Digital Meter (+) →Y (sensor Y/BL) lead

Digital Meter (-) → BK (sensor BR/BK) lead

• Turn the ignition switch on.
• Measure the intake air pressure sensor output voltage from various vacuum readings, while pulling the handle of the fork oil level gauge.
• Check the intake air pressure sensor output voltage, using the following formula and chart.

Suppose: Pg: Vacuum Pressure (Gauge) of Throttle Body

PI: Local Atmospheric Pressure (Absolute) measured by a barometer

Pv: Vacuum Pressure (Absolute) of Throttle Body

Vv: Sensor Output Voltage (V)

then Pv=Pl+Pg

Far example, suppose the following data is obtained:

Pg = -8 cmHg (Vacuum Gauge Reading)

PI = 70 cmHg (Barometer Reading)

Vv = 3.2 V (Digital Meter Reading)

then .

Pv = 70 + (-8) = 62 cmHg (Absolute)

Plot this Pv (62 cmHg) at a point [1] on the chart and draw a vertical line through the point. Then, you can get the usable range [2] of the sensor output voltage.

Usable range = 3.08 - 3.48 V

Plot Vv (3.2 V) on the vertical line. → Point [3].

Results: In the chart, Vv Is within the usable range and the sensor is normal.

• If the reading is out of the usable range, replace the sensor (see Intake Air Pressure Sensor Removal /Installation).
• If the reading is within the usable range, check the ECU for its ground and power supply (see ECU Power Supply Inspection).
• If the ground and power supply are good, replace the ECU (see ECU Removal/Installation).

ID: Idling

Ps: Standard Atmospheric Pressure (Absolute)

Pv: Throttle Vacuum Pressure (Mute)

ST Standard of Sensor Output Voltage (V)

TO: Throttle Full Open

UR: Usable Range of Sensor Output Voltage (V)

Vv: Intake Air Pressure Sensor Output Voltage (V) (Digital Meter Reading)

Intake Air Pressure Sensor Circuit

1. Intake Air Pressure Sensor
2.  ECU

See also: