Chrysler 300M 2002 Service Manual page 2465

DRIVEABILITY - NGC
P0068-MANIFOLD PRESSURE/THROTTLE POSITION CORRELATION -
HIGH FLOW/VACUUM LEAK DETECTED —
TEST
13 Turn the ignition off.
Disconnect the MAP Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance between ground and the 5 Volt Supply circuit at the MAP
Sensor harness connector.
Is the resistance above 100k ohms?
Yes → Go To 14
→ Repair the resistance to ground in the 5 Volt Supply circuit.
No
14 Turn the ignition off.
Disconnect the MAP Sensor harness connector.
With the DRBIII , monitor the MAP Sensor voltage.
Ignition on, engine not running.
Connect a jumper wire between the MAP Sensor Signal circuit and the Sensor
ground circuit .
Cycle the ignition switch from off to on.
With the DRBIII , monitor the MAP Sensor voltage.
Does the DRBIII display MAP voltage from approximately 4.9 volts to below 0.5
volt?
Yes → Replace the MAP Sensor.
→ Go To 15
No
15 Turn the ignition off.
Disconnect the MAP Sensor harness connector.
Disconnect the PCM harness connector.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING
THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMI-
NALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
Measure the resistance of the MAP Sensor Signal circuit from the MAP Sensor
harness connector to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
Yes → Go To 16
→ Repair the high resistance in the MAP Sensor Signal circuit
No
16 Turn the ignition off.
Disconnect the MAP Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance between ground and the MAP Sensor Signal circuit at the
MAP Sensor harness connector.
Is the resistance above 100k ohms?
Yes → Go To 17
→ Repair the resistance to ground in the MAP Sensor Signal circuit.
No
ACTION
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Continued
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APPLICABILITY
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