Chrysler Pacifica CS 2004 Service Manual page 50

DRIVEABILITY - NGC
P0068-MANIFOLD PRESSURE/THROTTLE POSITION CORRELATION —
Continued
TEST
13 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 (K1) MAP Sensor Signal circuit and the (K4)
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.
No
14 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 (K1) MAP 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 15
No
15 Turn the ignition off.
Disconnect the MAP Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance between ground and the (K1) MAP Signal circuit at the MAP
Sensor harness connector.
Is the resistance above 100k ohms?
Yes → Go To 16
No
16 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 (K4) Sensor ground 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 17
No
ACTION
Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.
→ Go To 14
→ Repair the (K1) MAP Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.
→ Repair the (K1) MAP Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.
→ Repair the (K4) Sensor Ground circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.
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APPLICABILITY
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