Boost Air Temperature, Shorted To High Source - New Holland CX720 Repair Manual

0400.3-BOOST AIR TEMPERATURE, SHORTED TO HIGH SOURCE

(SERVICE TOOL FAULT CODE XXX) (B.30.A.95.80 - G.30.B.54)
CX860, CX880
0400.3 - BOOST AIR TEMPERATURE, SHORTED TO HIGH SOURCE (SERVICE TOOL FAULT CODE XXX)
Context:
Engine enabled - no restriction on fuel or speed
Cause:
Signal range outside threshold limits
Signal not plausible or intermittent fault
Possible failure modes:
1. Faulty sensor
2. Faulty connector or wiring
Solution:
1. Harness connector fault
A. Inspect the harness connector onto the sensor. Ensure that the connector is not damaged, the pins are
correctly located in the connector body and that it is a tight fit onto the sensor.
B. If the harness connector is okay continue with step 3.
2. Sensor Fault
Temperature in °C
-40 ± 1
-30 ± 1
-20 ± 1
-10 ± 1
0 ± 1
10 ± 1
20 ± 1
30 ± 1
40 ± 1
50 ± 1
60 ± 1
70 ± 1
80 ± 1
90 ± 1
100 ± 1
110 ± 1
120 ± 1
130 ± 1
A. To test 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 3.
3. Wiring faulty
A. Check the wiring from the engine ECU to the sensor connector. With the key start ON, +5 V should be
measured on pin1 of sensor connector (+5 common line). If 0 V is indicated, check for an open circuit or
POWER PRODUCTION - AIR INTAKE SYSTEM
Resistance in Ω
Minimum
38313
22362
13402
8244
5227
3396
2262
1555
1080
771
555
408
304
231
178
137
106
84
B.30.A / 11
Nominal
45313
26114
15462
9397
5896
3792
2500
1707
1175
834
595
435
322
243
186
144
112
89
2 4/7/2006
Maximum
53103
30258
17718
10661
6623
4222
2760
1867
1277
900
639
465
342
257
196
152
119
95