(h)  
If the PMC connector resistances are in the limits shown in table 11, replace the wiring harness for the control parameter (AMM 73-21-06/401).

 (i)  
If the AC connector resistances are in the limits shown in table 11, replace the wiring harness for the control parameter (AMM 73-21-06/401).

 (j)  
If the AC connector resistances are in the limits shown in table 11 and N1 fan speed indication problems occur, do the following procedure: 1) Troubleshooting procedure for the N1 fan speed indication

 (AMM 71-00-54/101).

 (k)  
If the PMC or AC1 connector resistances are not in the limits shown in table 11, replace the N1 fan speed sensor (AMM 77-12-01/201).

 (l)  
Set PMC SRT switches 1, 2, 3, and 4 to position 0.

 (m)  
Remove the N1 fan speed sensor test cable from N1 connectors PMC.

 (n)  
Remove the AC1 from the PMC SRT N1 connector.

 (o)  
Reconnect the engine wiring harness to the N1 fan speed sensor connectors PMC and AC.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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(p)  Make sure the failure is corrected, do N1 Fan Speed Sensor Resistance Test again.
 S 765-081-C00
 (6)  T12 Inlet Temperature Sensor Resistance Test
 (a)  
Set PMC SRT switches 1, 2, 3, and 4 to position 0.

 (b)  
Make sure the Main Engine Test Cable is fully connected.

 (c)  
Make sure the multimeter indication is in the test limits for each position of the PMC SRT switch 4 (T12) (table 12).

 ~............................................................ | TABLE 12 | | T12 INLET TEMPERATURE SENSOR RESISTANCE TEST | .............................................................. | SWITCH 4 | | | | (T12) | | | | POSITION | TEST LIMITS | TEST POINT REFERENCE | .............................................................. | 1 |10M ohms minimum |P3-12 to cable shield P3-13 | .............................................................. | 2 |10M ohms minimum |P3-12 to ground | ...............................….............................. | 3 |Measure the resistance between pins P3-12 and | | |P3-24. Record the resistance for future | | |reference at step below to verify measured | | |resistance of T12 inlet temperature sensor is in | | |limits in table 13 below. | 2..........….................................................1

 (d)  
Remove the meter probe jumpers from the multimeter input terminals to disconnect the multimeter from the PMC SRT.

 (e)  
Connect the banana plugs on the temperature probe to the input terminals on the Fluke multimeter.

 NOTE: Connect the V banana plug on the temperature probe to
____ the V banana jack on the multimeter. Connect the COMM banana plug on the temperature probe to the COMM banana jack on the multimeter.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
(f)  
Set the switch on the Fluke multimeter to the 300mV position.

 (g)  
Set the power switch on the temperature probe to the degrees Celsius position or the degrees Fahrenheit position.

 (h)  
Measure the ambient temperature on the Fluke multimeter display.

 (i)  
The measured resistance of the T12 inlet temperature sensor on pins J3-12 and J3-24 (reference the measured resistance value from table 12, switch 4 (T12) position), must be in the limits shown in table 13 below.

 ~.............................................................................. | TABLE 13 | | T12 SENSOR RESISTANCE LIMITS | ...................................... ~...................................... | AMBIENT AIR | REQUIRED | | AMBIENT AIR | REQUIRED | | TEMPERATURE |RESISTANCE (OHMS)| | TEMPERATURE |RESISTANCE (OHMS)| | °F °C | MIN MAX | | °F °C | MIN MAX | ....................................... ....................................... | -10 -23 | 177 187 | | 60 16 | 208 218 | ....................................... ....................................... | -5 -21 | 179 189 | | 65 18 | 210 220 | ....................................... ....................................... | 0 -18 | 181 191 | | 70 21 | 212 222 | ....................................... ....................................... | 5 -15 | 183 193 | | 75 24 | 214 224 | ....................................... ....................................... | 10 -12 | 185 195 | | 80 27 | 216 226 | ....................................... ....................................... | 15 -9 | 188 198 | | 85 29 | 219 229 | ....................................... ....................................... | 20 -7 | 190 200 | | 90 32 | 221 231 | ....................................... ....................................... | 25 -4 | 192 202 | | 95 35 | 223 233 | ....................................... ....................................... | 30 -1 | 194 204 | | 100 38 | 225 235 | ....................................... ....................................... | 35 2 | 196 206 | | 105 41 | 228 237 | ....................................... ....................................... | 40 4 | 199 209 | | 110 43 | 230 240 | ....................................... ....................................... | 45 7 | 201 211 | | 115 46 | 232 242 | ....................................... ....................................... | 50 10 | 203 213 | | 120 49 | 234 244 | ....................................... 2..................…..................1 | 55 13 | 205 215 | 2..................…..................1
　
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