Jeep Wrangler TJ. Manual - part 84
Symptom:
P0111-INTAKE AIR TEMPERATURE SENSOR PERFORMANCE
When Monitored and Set Condition:
P0111-INTAKE AIR TEMPERATURE SENSOR PERFORMANCE
When Monitored:
The engine off time is greater than 480 minutes. Ambient Temperature
is greater than 4 deg C (38 deg F).
Set Condition:
After a calibrated amount of cool down time the PCM compares the ECT
Sensor, IAT Sensor, and the Ambient Air Temp Sensor values. The IAT Sensor value is not
within -10 deg C (18 deg F) of the other two temperature sensors. Two Trip Fault.
POSSIBLE CAUSES
GOOD TRIP EQUAL TO ZERO
(K21) IAT SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
IAT SENSOR
(K21) IAT SIGNAL CIRCUIT OPEN
(K900) SENSOR GROUND CIRCUIT OPEN
(K21) IAT SIGNAL CIRCUIT SHORTED TO GROUND
(K21) IAT SIGNAL CIRCUIT SHORTED TO THE (K900) SENSOR GROUND
PCM
TEST
ACTION
APPLICABILITY
1
Ignition on, engine not running.
With the DRBIII
t, read DTCs and record the related Freeze Frame data.
Is the Good Trip Counter displayed and equal to zero?
All
Yes
→ Go To 2
No
→ Refer to the INTERMITTENT CONDITION Symptom (Diagnos-
tic Procedure).
Perform POWERTRAIN VERIFICATION TEST VER - 5.
2
Turn the ignition off.
Disconnect the IAT Sensor harness connector.
Disconnect the C2 PCM 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.
Using a 12-volt test light connected to ground, probe the (K21) IAT Signal circuit in
the IAT Sensor harness connector.
Does the test light illuminate brightly?
All
Yes
→ Repair the short to voltage in the (K21) IAT Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 3
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DRIVEABILITY - NGC