Service Manual — page 145 of 715

Text on this page

FUEL SYSTEM (DFI) 3-55
Intake Air Pressure Sensor #1 (Service Code 12) (DTC P0105, P0107)
Intake Air Pressure Sensor #1 Inspection (Service
Code 12/DTC P0107)
(Checking wire for short circuit to ground)
• Disconnect:
   ECU Connectors (see ECU Removal)
   Intake Air Pressure Sensor #1 Connector (see Intake Air
   Pressure Sensor #1 Removal)
• Check the wiring for short circuit to ground by checking
  continuity between the sensor connector [A] and frame
  ground [B].
    Wiring Continuity Inspection
     Y/BL lead (ECU terminal 18) [C] ←→ Frame Ground
    If there is continuity, repair or replace the main harness.
    If there is no continuity, check the intake air pressure sen-
    sor #1 (see Intake Air Pressure Sensor #1 Output Voltage
    Inspection (Service Code 12/DTC P0105, P0107)).
Intake Air Pressure Sensor #1 Output Voltage
Inspection (Service Code 12/DTC P0105, P0107)
(Checking sensor for various vacuum)
• Remove the intake air pressure sensor #1 [A] and dis-
  connect the vacuum hose from the sensor (see Intake Air
  Pressure Sensor #1 Removal).
• Connect an auxiliary hose [B] to the intake air pressure
  sensor #1.
• Temporarily install the intake air pressure sensor #1.
○Connect a digital meter [C], vacuum gauge [D], the fork oil
  level gauge [E] and the measuring adapter to the intake
  air pressure sensor #1.
    Special Tools - Fork Oil Level Gauge: 57001-1290
                    Vacuum Gauge: 57001-1369
                    Measuring Adapter: 57001-1700

    Intake Air Pressure Sensor #1 Output Voltage
       Connections to Adapter:
        Digital Meter (+) → Y (sensor Y/BL) lead
        Digital Meter (–) → BK (sensor G) lead
○Turn the ignition switch on.
○Measure the intake air pressure sensor #1 output voltage
 from various vacuum readings, while pulling the handle of
 the fork oil level gauge.
○Check the intake air pressure sensor #1 output voltage,
 using the following formula and chart.
Suppose:
 Pg: Vacuum Pressure (Gauge) of Throttle Body
  Pl: Local Atmospheric Pressure (Absolute) measured by
      a barometer
 Pv: Vacuum Pressure (Absolute) of Throttle Body
 Vv: Sensor Output Voltage (V)
then
  Pv = Pl – Pg
For example, suppose the following data is obtained:
 Pg = 8 cmHg (Vacuum Gauge Reading)
 Pl = 70 cmHg (Barometer Reading)
 Vv = 3.2 V (Digital Meter Reading)