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Symptom:
P0111-INTAKE AIR TEMPERATURE SENSOR PERFORMANCE
When Monitored and Set Condition:
P0111-INTAKE AIR TEMPERATURE SENSOR PERFORMANCE
When Monitored: Engine off time is greater than 480 minutes. Ambient temperature is
greater than -23°C (-10°F).
Set Condition: After a calibrated amount of cool down time, the PCM compares the ECT
Sensor, IAT Sensor and the Ambient Air Temperature Sensor values. If the IAT Sensor
value is not within calibrated temperature amount of the other two temperature sensors
an error is detected. Two Trip Fault.
GOOD TRIP EQUAL TO ZERO
(K21) IAT SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
IAT SENSOR VOLTAGE BELOW 1.0 VOLTS
(K21) IAT SIGNAL CIRCUIT OPEN
(K4) SENSOR GROUND CIRCUIT OPEN
(K21) IAT SIGNAL SHORTED TO GROUND
(K21) IAT SIGNAL CIRCUIT SHORTED TO (K4) SENSOR GROUND
PCM HIGH
PCM LOW
TEST
1
Ignition on, engine not running.
With the DRBIII , read DTCs and record the related Freeze Frame data.
Is the Good Trip Counter displayed and equal to zero?
Yes → Go To 2
→ Refer to the INTERMITTENT CONDITION symptom in the
No
2
Turn the ignition off.
Disconnect the IAT Sensor harness connector.
NOTE: Visually inspect both the component and the PCM connectors. Look
for damaged, partially broken wires, and backed out or corroded terminals.
Ignition on, engine not running.
Measure the voltage on the (K21) IAT Signal circuit in the IAT Sensor harness
connector.
Is the voltage above 5.2 volts?
Yes → Repair the short to battery voltage in the (K21) IAT Signal circuit.
→ Go To 3
No
POSSIBLE CAUSES
ACTION
Driveability category.
Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.
Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.
DRIVEABILITY - NGC
59
APPLICABILITY
All
All
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