ASCD Pump Circuit Check

CHECK ASCD PUMP
1. Disconnect ASCD pump connector.
2. Measure resistance between ASCD pump terminals 1 and 2, 3, 4.
  
  Fig 1: Terminals Resistance
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 2: Measuring Resistance Between ASCD Pump Terminals 1 And 2, 3, 4.
  Courtesy of NISSAN MOTOR CO., U.S.A.
Refer to wiring diagram in "FIG. 4 ".

OK or NG
1. OK >> GO TO 2.
2. NG >> Replace ASCD pump.
CHECK ASCD PUMP CIRCUIT
1. Disconnect ASCD control unit harness connector.
2. Check harness for open or short between ASCD control unit and ASCD pump.
  
  Fig 3: Terminals And Circuits Table
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 4: Identifying Data Monitor
  Courtesy of NISSAN MOTOR CO., U.S.A.
  1. Continuity should exist.
OK or NG
1. OK >> GO TO 3.
2. NG >> Repair harness.
CHECK ASCD PUMP POWER SUPPLY
With CONSULT-II
1. Jack up the drive wheels.
2. See "PW SUP-VALVE" in "DATA MONITOR" mode.
3. Maintain the conditions below.
  - Vehicle speed is more than 40 km/h (25 MPH).
  - Main switch (CRUISE lamp) is ON.
  - Set/coast switch (SET lamp) is ON.
    1. "PW SUP-VALVE" should be ON.
  Fig 5: Identifying Data Monitor
  Courtesy of NISSAN MOTOR CO., U.S.A.
Without CONSULT-II
1. Jack-up the drive wheels.
2. Maintain the conditions below.
  - Vehicle speed is more than 40 km/h (25 MPH).
  - Main switch (CRUISE lamp) is ON.
  - Set/coast switch (SET lamp) is ON.
Check voltage between ASCD control unit harness connector terminal 12 and ground.
1. Battery voltage should exist.
OK or NG
1. OK >> ASCD pump power supply is OK.
2. NG >> Replace ASCD control unit.
  
  Fig 6: Checking Voltage Between ASCD Connector Terminal 12 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.