Jeep XJ. Manual — part 821
TEST
ACTION
APPLICABILITY
8
WARNING: KEEP CLEAR OF THE ENGINE’S MOVING PARTS.
NOTE: The conditions that set the DTC are not present at this time. The
following list below may help in indentifying the intermittent condition.
While the engine is running at normal operating temperatures, monitor the DRBIII
t
parameters related to the DTC while wiggling the wiring harness. Look for param-
eter values to change and/or a DTC to set.
Review the DRBIII
t Freeze Frame information. If possible try and duplicate the
conditions under which the DTC was set.
Refer to any Technical Service Bulletins (TSB) that may apply.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wiring harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Were any of the above conditions present?
All
Yes
→
Repair as necessary
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
Test Complete.
45
DRIVEABILITY - GAS
P0108-MAP SENSOR VOLTAGE TOO HIGH —
Continued
Symptom:
P0112-INTAKE AIR TEMP SENSOR VOLTAGE LOW
When Monitored and Set Condition:
P0112-INTAKE AIR TEMP SENSOR VOLTAGE LOW
When Monitored:
With the ignition on and battery voltage greater than 10.4 volts.
Set Condition:
The Intake Air Temperature (IAT) sensor circuit voltage at the PCM goes
below 0.8 volt.
POSSIBLE CAUSES
INTERMITTENT CONDITION
IAT SENSOR INTERNAL FAILURE
IAT SENSOR SIGNAL SHORTED TO GROUND
IAT SENSOR SIGNAL SHORTED TO SENSOR GROUND CIRCUIT
PCM
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, read DTCs.
Is the Good Trip Counter for P0112 displayed and equal to zero?
All
Yes
→
No
→
2
Turn the ignition on.
With the DRBIII
t, read the IATvoltage.
Is the voltage below 1.0 volt?
All
Yes
→
No
→
46
DRIVEABILITY - GAS
TEST
ACTION
APPLICABILITY
3
WARNING: KEEP CLEAR OF THE ENGINE’S MOVING PARTS.
NOTE: The conditions that set the DTC are not present at this time. The
following list below may help in indentifying the intermittent condition.
While the engine is running at normal operating temperatures, monitor the DRBIII
t
parameters related to the DTC while wiggling the wiring harness. Look for param-
eter values to change and/or a DTC to set.
Review the DRBIII
t Freeze Frame information. If possible try and duplicate the
conditions under which the DTC was set.
Refer to any Technical Service Bulletins (TSB) that may apply.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wiring harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Were any of the above conditions present?
All
Yes
→
Repair as necessary
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
4
Turn the ignition off.
Disconnect the IAT harness connector.
Turn the ignition on.
With the DRBIII
t, read IAT voltage.
Is the voltage above 1.0 volt?
All
Yes
→
Replace the IAT Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
5
Turn the ignition off.
Disconnect the IAT Sensor harness connector.
Disconnect the PCM harness connector(s).
Measure the resistance of the IAT Sensor Signal circuit in the IAT Sensor harness
connector to ground.
Is the resistance below 5 ohms?
All
Yes
→
Repair the IAT Sensor Signal circuit for a short to ground.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
6
Turn the ignition off.
Disconnect the IAT Sensor harness connector.
Disconnect the PCM harness connector(s).
Measure the resistance between the IAT Sensor Signal circuit and the Sensor ground
circuit in the IAT Sensor harness connector.
Is the resistance below 5 ohms?
All
Yes
→
Repair the IAT Sensor Signal circuit for a short to the Sensor
ground circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
7
If there are no possible causes remaining, view repair.
All
Repair
Replace the Powertrain Control Module.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
47
DRIVEABILITY - GAS
P0112-INTAKE AIR TEMP SENSOR VOLTAGE LOW —
Continued
TEST
ACTION
APPLICABILITY
8
WARNING: KEEP CLEAR OF THE ENGINE’S MOVING PARTS.
NOTE: The conditions that set the DTC are not present at this time. The
following list below may help in indentifying the intermittent condition.
While the engine is running at normal operating temperatures, monitor the DRBIII
t
parameters related to the DTC while wiggling the wiring harness. Look for param-
eter values to change and/or a DTC to set.
Review the DRBIII
t Freeze Frame information. If possible try and duplicate the
conditions under which the DTC was set.
Refer to any Technical Service Bulletins (TSB) that may apply.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wiring harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Were any of the above conditions present?
All
Yes
→
Repair as necessary
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
Test Complete.
48
DRIVEABILITY - GAS
P0112-INTAKE AIR TEMP SENSOR VOLTAGE LOW —
Continued
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