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: Measuring Resistance Between ASCD Pump Terminals 1 And 2, 3, 4
  Courtesy of NISSAN MOTOR CO., U.S.A.
Refer to wiring diagram in WIRING DIAGRAM - ASCD - .

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 2: Checking Harness For Open Or Short Between ASCD Control Unit And ASCD Pump
  Courtesy of NISSAN MOTOR CO., U.S.A.
Refer to wiring diagram in WIRING DIAGRAM - ASCD - .

OK or NG
1. OK : GO TO 3.
2. NG : Repair harness.
CHECK ASCD PUMP POWER SUPPLY
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.

Fig 3: Checking Voltage Between ASCD Control Unit Harness Connector Terminal 12 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

Refer to wiring diagram in WIRING DIAGRAM - ASCD - .

OK or NG
1. OK : ASCD pump power supply is OK.
2. NG : Replace ASCD control unit.