Proheat M80 - Page 46

PROHEAT M-SERIES SERVICE MANUAL
3-30
Test Procedure – Temperature Sensor measurement:
a) Using a multimeter set for resistance, measure across pins A and B of
the sensor.
If the sensor measures out of range (see chart below), the sensor is
faulty.
Go to Temperature Sensor replacement.
Temperature Sensor and PCM electrical (dual sensors) – Check:
a) Temperature Sensor and PCM electrical function.
Test Procedure – Sensor and PCM:
a) Remove Temperature Sensor connector from PCM connection T1.
b) Remove Temperature Sensor connector from PCM connection T2.
c) Swap the connectors. T1 to T2 and T2 to T1.
d) Switch the PROHEAT on:
If a Temperature Sensor T1 diagnostic code is now indicated, the sensor
is faulty. Go to Temperature Sensor replacement.
If a Temperature Sensor T2 diagnostic code is still indicated, the PCM is
faulty. Go to PCM replacement, page 3-39.
Figure 3-36: Temperature Sensors
T1
T2
TEMP SENSOR T1: Step 2
(7 or 9 Flashes)
TORQUE TO 100 in-lbs
TORQUE TO 50 in-lbs
Figure 3-35: Temperature Sensor Test
TEMP (C) TEMP (F) OHMS (±4%)
-30 -22 2108926.1
-25 -13 1527456.0
-20 -4 1117735.9
-15 5 826007.0
-10 14 616199.9
-5 23 463853.2
0 32 352205.6
5 41 269657.2
10 50 208103.2
15 59 161828.4
20 68 126766.5
25 77 100000.0
30 86 79417.9
35 95 63481.0
40 104 51058.1
TEMP (C) TEMP (F) OHMS (±4%)
45 113 41312.0
50 122 33618.4
55 131 27508.9
60 140 22629.3
65 149 18710.5
70 158 15546.6
75 167 12978.9
80 176 10884.8
85 185 9168.8
90 194 7756.1
95 203 6587.9
100 212 5617.8
105 221 4808.8
110 230 4131.4