Chrysler PT Cruiser 2001 Service Manual Supplement page 2518

DRIVEABILITY - GAS
P0118-ECT SENSOR VOLTAGE TOO HIGH —
TEST
4 Turn the ignition off.
Disconnect the ECT Sensor harness connector.
Disconnect the PCM harness connectors.
Measure the resistance of the ECT Sensor Signal circuit.
Is the resistance below 5.0 ohms?
Yes → Go To 5
→ Repair the ECT Sensor Signal circuit for an open.
No
5 Turn the ignition off.
Disconnect the ECT Sensor harness connector.
Turn the ignition on.
With the DRB, monitor the ENG COOLANT TMP VLT value.
Connect a jumper wire between the ECT Sensor Signal circuit and the ECT Sensor
Ground circuit in the ECT Sensor harness connector.
Note: The voltage should change from greater than 4.5 volts to less than 1.0
volt.
Did the ENG COOLANT TMP VLT value change from greater than 4.5 volts to less
than 1.0 volt?
Yes → Replace the ECT Sensor.
→ Go To 6
No
6 If there are no possible causes remaining, view repair.
Repair
7 Turn the ignition off.
NOTE: Visually inspect the related wiring harness. Look for any chafed,
pierced, pinched, or partially broken wires.
Note: Visually inspect the related wiring harness connectors. Look for
broken, bent, pushed out, or corroded terminals.
Note: Refer to any Technical Service Bulletins (TSB) that may apply.
Perform a wiggle test on the related wiring harnesses with the engine running.
Watch for the Good Trip Counter to change to 0.
Were any problems found?
Yes → Repair wiring harness/connectors as necessary.
→ Test Complete.
No
ACTION
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Replace the Powertrain Control Module.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Continued
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APPLICABILITY
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