New Holland CX720 Repair Manual page 2148

0.7-0.8 V at 70 kPa(10 lbf.in2 ), idle erpm, to 4.0-4.1 V at 360 kPa (52 lbf.in2 ), max erpm. If there is
voltage but out of range replace sensor, if Zero volts is indicated continue with step 4.
To test the temperature part of the sensor measure the resistance across pins 1 and 2 of the sensor. The
resistance will vary according to the temperature detailed in the table above.
B. If the sensor is to specification continue with step 4.
4. Wiring faulty
A. Check the wiring from the engine ECU to the sensor connector, X210. With the keystart ON, +5 V should
be measured on wire EN--888--PK, pin 3 of sensor connector (+5V common line). If ZERO volts is indi-
cated check for an Open Circuit or Short to ground back to the engineECU, connector X192, pin 23. Trace
fault and repair wiring as required. If wiring to pin 3 is okay continue with step B.
B. With the keystart OFF, continuity to ground should be indicated on wire EN--885--BL, pin 1 of sensor
connector (ground common line). If no ground is indicated, check for anOpen circuit back to the engine
ECU, connector X192, pin17. Trace fault and repair wiring as required. With the keystart ON, check pin 1
for a short to +12 V. If +12 V is indicated trace fault and repair wiring to pin 1. If the wiring to pin 1 is okay
continue with step C or D.
C. For an air temperature sensor error check the wiring to pin 2 of the sensor connector. Check for an open
circuit back to engine ECU, connector X192, pin 10. Check also for a short to ground, and a short to +12
V. If any fault is indicated trace and repair the wiring as required.
D. For a boost pressure sensor error check the wiring to pin 4 of the sensor connector. Check for an open
circuit back to engine ECU, connector X193, pin 12. Check also for a short to ground, and a short to +12
V. If any fault is indicated trace and repair the wiring as required.
Series 1206 and above
Wiring harness - Electrical schematic frame 04 (A.30.A.88-C.20.E.04)
POWER PRODUCTION - AIR INTAKE SYSTEM
2 4/7/2006
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