Jeep XJ. Manual — part 820
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
→
Test Complete.
4
Turn the ignition off.
Disconnect the MAP Sensor harness connector.
Turn the ignition on.
Measure the voltage of the 5 Volt Supply circuit in the MAP Sensor harness
connector.
Is the voltage between 4.5 to 5.2 volts?
All
Yes
→
No
→
5
Turn the ignition off.
Disconnect the MAP Sensor harness connector.
With the DRBIII
t, monitor the MAP Sensor voltage.
Turn the ignition on.
Is the voltage above 1.2 volts?
All
Yes
→
Replace the MAP Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
6
Turn the ignition off.
Disconnect the MAP Sensor harness connector.
Disconnect the PCM harness connector(s).
Measure the resistance of the MAP Sensor Signal circuit in the MAP Sensor harness
connector to ground.
Is the resistance below 5 ohms?
All
Yes
→
Repair the MAP Sensor Signal circuit for a short to ground.
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.
41
DRIVEABILITY - GAS
P0107-MAP SENSOR VOLTAGE TOO LOW —
Continued
TEST
ACTION
APPLICABILITY
8
Turn the ignition off.
Disconnect the MAP Sensor harness connector.
Disconnect the PCM harness connector(s).
Measure the resistance of the 5 Volt Supply circuit in the MAP Sensor harness
connector to ground.
Is the resistance below 5 ohms?
All
Yes
→
Repair the 5 Volt Supply circuit for a short to ground.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
9
Turn the ignition off.
Disconnect the MAP Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance of the 5 Volt Supply circuit between the MAP Sensor harness
connector and the PCM harness connector.
Is the resistance below 5 ohms?
All
Yes
→
No
→
Repair the 5 Volt Supply circuit for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
10
If there are no possible causes remaining, view repair.
All
Repair
Replace the Powertrain Control Module.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
42
DRIVEABILITY - GAS
P0107-MAP SENSOR VOLTAGE TOO LOW —
Continued
Symptom:
P0108-MAP SENSOR VOLTAGE TOO HIGH
When Monitored and Set Condition:
P0108-MAP SENSOR VOLTAGE TOO HIGH
When Monitored:
With the engine RPM above 400, the TPS voltage less than 1.13 volt,
and battery voltage greater than 10.4 volts
Set Condition:
The MAP sensor signal voltage is greater than 4.88 volts at start or with
the engine running for 2.2 seconds.
POSSIBLE CAUSES
INTERMITTENT CONDITION
MAP SENSOR SIGNAL CIRCUIT SHORTED TO 5 VOLT SUPPLY CIRCUIT
MAP SENSOR SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
MAP SENSOR INTERNAL FAILURE
MAP SENSOR SIGNAL CIRCUIT OPEN
SENSOR GROUND CIRCUIT OPEN
PCM
TEST
ACTION
APPLICABILITY
1
Start the engine.
With the DRBIII
t, read the MAP Sensor voltage.
Is the voltage above 4.6 volts?
All
Yes
→
No
→
2
Turn the ignition off.
Disconnect the MAP Sensor harness connector.
Disconnect the PCM harness connector(s).
Measure the resistance between the MAP Sensor Signal circuit and the 5 Volt Supply
circuit in the MAP Sensor harness connector.
Is the resistance below 5 ohms?
All
Yes
→
Repair the MAP Sensor Signal circuit for a short to the 5 Volt
Supply circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
43
DRIVEABILITY - GAS
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the MAP Sensor harness connector.
Turn the ignition on.
Measure the voltage of the MAP Sensor Signal circuit in the MAP Sensor harness
connector.
Is the voltage above 5.2 volts?
All
Yes
→
Repair the MAP Sensor Signal circuit for a short to battery
voltage.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
4
Turn the ignition off.
Disconnect the MAP Sensor harness connector.
Connect a jumper wire between the MAP Sensor Signal circuit and the Sensor
ground circuit.
With the DRBIII
t, monitor the MAP Sensor voltage.
Turn the ignition on.
Is the voltage below 1.0 volts?
All
Yes
→
Replace the MAP Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
5
Turn the ignition off.
Disconnect the MAP Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance of the MAP Sensor Signal circuit between the MAP Sensor
harness connector and the PCM harness connector.
Is the resistance below 5 ohms?
All
Yes
→
No
→
Repair the MAP Sensor Signal circuit for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
6
Turn the ignition off.
Disconnect the MAP Sensor harness connector.
Disconnect the PCM harness connector(s).
Measure the resistance of the Sensor ground circuit in the MAP Sensor harness
connector to ground.
Is the resistance below 5 ohms?
All
Yes
→
No
→
Repair the Sensor ground circuit for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
7
If there are no possible causes remaining, view repair.
All
Repair
Replace the Powertrain Control Module.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
44
DRIVEABILITY - GAS
P0108-MAP SENSOR VOLTAGE TOO HIGH —
Continued
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