Acceptable Readings for the Actuator Stepper Motor Test
Condition
Toggle Switch Position
Conclusion
Action
Normal
Reversed
If the readings in all four
rotary switch positions are...
10–14 mA
less than 0.2 mA Normal
None; actuator is okay
electrically.
If the readings in any one or
more of the rotary switch
positions are...
15–350 mA
less than 0.2 mA
Shorted or partially shorted
motor coil
Replace actuator.
less than 0.2 mA less than 0.2 mA Open diode or motor coil
*
0.3–9.9 mA
less than 0.2 mA
Check tester battery and
retest. If battery okay, motor
winding has high
resistance.
19–24 mA
19–24 mA
Shorted diode
*
If the reading for each rotary switch and toggle switch position is less than 0.2 mA, check the fuse in the digital multimeter.
Table 7, Acceptable Readings for the Actuator Stepper Motor Test
Actuator Circuit Diagnosis
See
for the actuator circuit test procedures.
Evaporator Temperature Sensor
General Information
The evaporator temperature sensor is located on the
evaporator. The sensor input to the FCU is used to
control the A/C compressor in order to prevent
evaporator freezing. The sensor has a negative tem-
perature coefficient (NTC), which means that its re-
sistance decreases as temperature increases.
Evaporator Temperature Sensor
Circuit Test
See
for the evaporator temperature sensor
circuit test procedures.
Actuator Circuit Test
Test
No.
Test
Test Procedure
Test Result
Action
1
Check for fault codes.
Check if any one of the following
fault codes is active:
f040619
07/02/2002
146 s005 05
146 s006 05
146 s009 05
200 s009 05
Group A
Group B
146 s005 06
146 s006 06
146 s009 06
200 s009 06
Single fault in Group A
is active.
Go to test no. 2
.
All three MID 146 faults
are active in Group A.
Go to test no. 6
.
Single fault in Group B
is active.
Go to test no. 8
.
No faults listed in
Group A or B are
active.
No problem found.
Heater and Air Conditioner Troubleshooting
83.00
Electrical System Tests
122SD and Coronado Workshop Manual, Supplement 9, June 2014
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