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DIAGNOSTICS. Operate vehicle and verify that DTCs do not reset. If DTCs reset, go to
step 2 . If DTCs do not reset, system is okay.
DTC B0333: AMBIENT AIR TEMPERATURE SENSOR OPEN
Diagnostic Aids
If DTC is intermittent or has a history, perform tests while wiggling wiring and connectors. This
can often cause the 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 OUTSIDE AIR TEMP SENSOR in HVAC
data list. If scan tool indicates ambient outside air temperature sensor value is 0.1-5 volts,
see DIAGNOSTIC AIDS . If scan tool does not indicate outside air temp sensor value is
0.1-5 volts, go to next step.
3. Turn ignition off. Disconnect ambient temperature sensor. Turn ignition on. Use scan tool to
observe OUTSIDE AIR TEMP SENSOR parameter with scan tool. If scan tool indicates
value is more than 4.9 volts, go to step 5 . If scan tool indicates value is 4.9 volts or less, go
to next step.
4. Connect a fused jumper wire between terminals "A" (Light Green/Black wire) and
"B" (Gray/Black wire) of ambient temperature sensor. Turn ignition on. Use scan tool to
observe OUTSIDE AIR TEMPERATURE SENSOR parameter. If scan tool indicates 0.1
volt or more exists, go to step 6 . If scan tool indicates less than 0.1 volt exists, go to step 9 .
5. Turn ignition off. Check continuity between ground and terminal "A" (Light Green/Black
wire) of ambient air temperature sensor. If continuity exists, repair short to ground in Light
Green/Black wire between ambient outside air temperature sensor and terminal D3 of
HVAC control head. After repairs, go to step 12 . If continuity does not exist, go to step 9 .
6. Measure voltage between ground and terminal "A" (Light Green/Black wire) of ambient
outside air temperature sensor. If voltage exists, repair short to voltage in Light Green/Black
wire between ambient outside air temperature sensor and terminal D3 of HVAC control
head harness connector. After repairs, go to step 12 . If voltage does not exist, check
continuity of Light Green/Black wire between terminal "A" of ambient outside air
2001 Chevrolet Corvette
2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette
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