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If DTC is intermittent or has a history, perform tests while wiggling wiring and connectors. This
can often cause malfunction to appear. Inspect sensor connector and harness for damage,
corrosion or water intrusion. Check for adequate terminal tension, harness routing, damaged wire
insulation, and broken wires. Resistance value of sensor must be close to values listed in chart.
See OUTSIDE AIR TEMPERATURE SENSOR RESISTANCE or INSIDE AIR
TEMPERATURE SENSOR RESISTANCE . If sensor is out of specification, it must be
replaced.
Diagnostic Procedure
1. Perform diagnostic system check. See DIAGNOSTIC SYSTEM CHECK under
TROUBLE SHOOTING. Go to next step.
2. Connect scan tool. Turn ignition on. Observe INSIDE AIR TEMP SENSOR in HVAC data
list. If scan tool indicates inside air temperature sensor value is 0.1-5 volts, see
DIAGNOSTIC AIDS . If scan tool does not indicate inside air temperature sensor value is
0.1-5 volts, go to next step.
3. Turn ignition off. Disconnect inside air temperature sensor. Turn ignition on. Use scan tool
to observe inside air temperature sensor parameter with scan tool. If scan tool indicates
more than 4.9 volts, go to next step. If scan tool indicates 4.9 volts or less, go to step 5 .
4. Turn ignition off. Connect a fused jumper wire between terminal "A" (Dark Green wire)
and terminal "B" (Gray/Black wire) of inside temperature sensor harness connector. Turn
ignition on (with engine off). Use scan tool to observe INSIDE AIR TEMP SENSOR
parameter. If scan tool indicates 0.1 volt or more exists, go to step 8 . If scan tool indicates
less than 0.1 volt exists, go to step6 .
5. Turn ignition off. Check continuity between ground and terminal "A" (Dark Green wire) of
inside air temperature sensor harness connector. If continuity exists, repair short to ground
in Dark Green wire between inside air temperature sensor and terminal D2 of HVAC
control head harness connector. After repair, go to step 12 . If continuity does not exist, go
to step 9 .
6. Measure voltage between ground and terminal "A" (Dark Green wire) of inside air
temperature sensor. If voltage exists, repair short to voltage in Dark Green wire between
inside air temperature sensor and terminal D2 of HVAC control head harness connector.
After repair, go to step 12 . If voltage does not exist, check continuity of Dark Green wire
between terminal "A" of inside air temperature sensor and terminal D2 of HVAC control
module. If continuity exists, go to next step. If continuity does not exist, repair open or high
resistance in Dark Green wire and go to step 12 .
7. Check continuity between ground and terminal "B" (Gray/Black wire) of inside air
temperature sensor. If continuity exists, go to step 9 . If continuity does not exist, repair
open or high resistance in Gray/Black wire between ambient outside air temperature sensor
2001 Chevrolet Corvette
2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette
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