Dodge ZB 2005 Service Manual page 1199

DRIVEABILITY - GAS
P0172-1/1 FUEL SYSTEM RICH —
TEST
5 NOTE: The engine must be at operating temperature and in closed loop to
perform this test.
Start the engine.
WARNING: WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A
DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE
PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
Allow the engine to reach normal operating temperature.
With the DRBIII select System Tests, perform the Purge Vapors Test.
Observe the Short Term Adaptive value and press 3 to flow.
NOTE: Short Term Adaptive value change.
Did the Short Term Adaptive value change?
Yes → Go To 6
→ Refer to the Driveability category and perform the appropriate
No
6 Ignition on, engine not running.
With the DRBIII , read TP Sensor voltage.
NOTE: The throttle must be against the stop.
Is the voltage 0.92 of a volt or less with the Throttle closed?
Yes → Go To 7
→ Check for a binding throttle condition. If OK, replace the Throttle
No
7 With the DRBIII , read the TP Sensor voltage.
While monitoring the DRBIII , slowly open and close the throttle.
Does the voltage increase and decrease smoothly?
Yes → Go To 8
→ Replace the Throttle Position Sensor.
No
8 Turn the ignition off.
Connect a Vacuum Gauge to a Manifold Vacuum source.
Start the engine.
Allow the engine to idle.
Note: If engine will not idle, maintain a constant RPM above idle.
With the DRBIII in Sensors, read the MAP Sensor vacuum value.
Is the DRBIII reading within 1 of the Vacuum Gauge reading?
Yes → Go To 9
→ Replace the MAP Sensor.
No
NOTE: Remove the vacuum gauge before continuing.
Continued
ACTION
Diagnostic test.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Position Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
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APPLICABILITY
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