RV METER
TSB Revision
CHASSIS ELECTRICAL
54A-269
STEP 3. Using scan tool MB991958, read the A/C
diagnostic trouble code.
CAUTION
To Prevent to damage to scan toll MB991958, always turn
the ignition switch to "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch "ON" position.
(3) Read the A/C diagnostic trouble code.
Q: Is A/C diagnostic trouble code 13 or 14 set?
YES : Go to Step 4.
NO : Go to Step 5.
STEP 4. Check the ambient air temperature sensor.
(1) Remove the radiator grille.
(2) Remove the ambient air temperature sensor.
(3) Measure the resistance between the ambient air
temperature sensor terminals at two or more temperature
conditions.
Q: Does the resistance value exist within the characteristic
graph?
YES : There is no action to be taken.
NO : Replace the ambient air temperature sensor.
AC306409AF
MB991911
MB991824
MB991827
ACX2146 AB