Chrysler PT Cruiser 2001 Service Manual Supplement page 2520

DRIVEABILITY - GAS
P0121-TPS VOLTAGE DOES NOT AGREE WITH MAP —
TEST
2 Turn the ignition on.
Using the wiring diagram as a guide, inspect the Throttle Position Sensor wiring and
connectors.
Were any problems found?
Yes → Repair as necessary.
→ Go To 3
No
3 Turn the ignition on.
With the DRBIII , read TPS VOLTS.
While monitoring the DRBIII , slowly open and close the Throttle.
Is the voltage change smooth?
Yes → Go To 4
→ Replace the Throttle Position Sensor.
No
4 Turn the ignition off.
Tee in a Vacuum Gauge to a Manifold Vacuum source.
Start the engine.
Allow the engine to idle.
Note: If the engine will not idle, maintain a constant RPM above idle.
Using the DRB, read the MAP Sensor vacuum.
Is the reading within 1 of the teed-in Vacuum Gauge?
Yes → Go To 5
→ Replace the MAP Sensor.
No
5 Turn the ignition on.
With the DRB, read the Throttle Position Sensor voltage.
Is the voltage above 1.0 volt?
Yes → Replace the Throttle Position Sensor.
→ Go To 6
No
6 Turn the ignition on.
With the DRB, read the Throttle Position Sensor voltage.
Open the Throttle Plate to wide open throttle.
Is the Throttle Position Sensor voltage above 3.5 volts?
Yes → Go To 7
→ Replace the Throttle Position Sensor.
No
7 Turn the ignition off.
Disconnect the Throttle Position Sensor harness connector.
Note: Check connectors - Clean/repair as necessary.
Turn the ignition on.
Measure the Throttle Position Sensor 5-Volt Supply circuit at the TPS harness
connector.
Is the voltage below 4.0 volts?
Yes → Go To 8
→ Go To 10
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.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
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Continued
APPLICABILITY
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