Jeep XJ. Manual — part 849
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Disconnect the vacuum line at the PCV valve.
Install Miller Tool #6714 (0.185
9 air metering orifice) into the disconnected vacuum
line in place of the PCV valve.
Disconnect the purge hose from the fitting on the throttle body. The purge hose is
located on the front of the throttle body next to the MAP sensor. Cap the fitting at the
throttle body after the purge hose has been disconnected.
Start the engine. Ensure that all accessories are off. Allow the engine to reach
operating temperature above 82°C (180°F).
With the DRBIII
t in System Tests, perform the 9Minimum Air Flow9 function.
Is the engine RPM between 500 and 900?
All
Yes
→
Test Complete.
No
→
5
Turn the ignition off.
Remove the Throttle Body.
Warning: Clean throttle body in a well ventilated area. Wear rubber or butyl
gloves. Do not let cleaner come in contact with eyes or skin. Avoid injesting
cleaner. Wash thoroughly after using cleaner.
While holding the throttle open, spray the entire throttle body bore and the manifold
side of the throttle plate with Mopar Throttle Body Cleaner. Clean the IAC motor
passage also. Use compressed air to dry the throttle body.
Re-install the throttle body.
Note: Miller Tool #6714 (0.185
( air metering orifice) still attached to the PCV
vacuum line and the purge hose fitting on the throttle body capped.
Start the engine. Ensure that all accessories are off. Allow the engine to reach
operating temperature above 82°C (180°F).
With the DRBIII
t in System Tests, perform the 9Minimum Air Flow9 function.
Is the engine RPM between 500 and 900?
All
Yes
→
Repair complete.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
No
→
Test Complete.
Caution: Stop all actuations. Turn engine off.
157
DRIVEABILITY - GAS
P1294-TARGET IDLE NOT REACHED —
Continued
Symptom:
P1296-NO 5 VOLTS TO MAP SENSOR
When Monitored and Set Condition:
P1296-NO 5 VOLTS TO MAP SENSOR
When Monitored:
During power-down and battery voltage greater than 10.4 volts.
Set Condition:
The MAP sensor signal voltage goes below 2.35 volts with the key off for
5 seconds.
POSSIBLE CAUSES
5 VOLT SUPPLY CIRCUIT
MAP SENSOR
MAP SENSOR WIRING HARNESS INTERMITTENT PROBLEM
MAP SENSOR 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
PCM (5-VOLT SUPPLY)
TEST
ACTION
APPLICABILITY
1
Note: If the PO107 - MAP Sensor Voltage Too Low is also set, diagnose it first
before continuing with P1296 - No 5 Volts To MAP Sensor.
Turn the igntion on.
With the DRBIII
t in Sensors, read the MAP sensor voltage..
Is the voltage below 2.35 volts?
All
Yes
→
No
→
2
Turn the ignition off.
Disconnect the MAP Sensor harness connector.
Measure the voltage of the 5 Volt Supply circuit at the MAP Sensor harness
connector.
Is the voltage above 4.5 volts?
All
Yes
→
No
→
Repair the 5 Volt Supply circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
3
Turn the ignition off.
Disconnect the MAP Sensor harness connector.
Turn the ignition on.
With the DRBIII
t in Sensors, read the MAP Sensor voltage.
Is the voltage above 4.5?
All
Yes
→
Replace the MAP Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
158
DRIVEABILITY - GAS
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Disconnect the MAP Sensor Electrical harness connector.
Disconnect the PCM harness connector(s).
Note: Check connectors - Clean/repair as necessary.
Measure the MAP Sensor 5-volt Supply Circuit for resistance to ground.
Is the resistance below 5.0 ohms?
All
Yes
→
Repair the 5-volt Supply Circuit for a short to ground.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
5
If there are no possible causes remaining, view repair.
All
Repair
Replace the Powertrain Control Module.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
6
Start the engine.
With the DRBIII
t in Sensors, read the MAP Sensor voltage.
Wiggle MAP Sensor harness connector & wiring harness.
Monitor the DRBIII
t display.
Was there any MAP Sensor voltage change?
All
Yes
→
Repair the Harness or Connector that caused the voltage change.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
Test Complete.
159
DRIVEABILITY - GAS
P1296-NO 5 VOLTS TO MAP SENSOR —
Continued
Symptom:
P1297-NO CHANGE IN MAP FROM START TO RUN
When Monitored and Set Condition:
P1297-NO CHANGE IN MAP FROM START TO RUN
When Monitored:
With engine RPM +/- 64 of target idle and the throttle blade at closed
throttle.
Set Condition:
Too small of a difference is seen between barometric pressure with ignition
on (engine running) and manifold vacuum for 8.80 seconds.
POSSIBLE CAUSES
MAP SENSOR TOO LOW CODE SET
MAP SENSOR WIRING HARNESS INTERMITTENT PROBLEM
VACUUM PORTS RESTRICTED
MAP SENSOR 5-VOLT SUPPLY CIRCUIT OPEN
MAP SENSOR (NO PRESS CHANGE)
MAP SENSOR (PRESS CHANGE)
MAP SENSOR RESTRICTED
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, read DTCs.
Is the MAP Sensor Voltage Too Low code set?
All
Yes
→
Refer to symptom P0107 MAP SENSOR VOLTS TOO LOW in the
DRIVEABILITY category.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
2
Turn the ignition on.
With the DRBIII
t, erase DTCs.
Start engine and allow engine to idle for 30 seconds.
With the DRBIII
t, read DTCs.
Does the DRBIII
t display No Change In MAP From Start To Run?
All
Yes
→
No
→
3
Turn the ignition off.
Disconnect the MAP Sensor harness connector.
Disconnect the PCM harness connector(s).
Measure the resistance of the MAP Sensor 5-Volt Supply Circuit between the MAP
Sensor harness connector to the PCM harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the 5-volt supply circuit for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
160
DRIVEABILITY - GAS
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