Chrysler 300M 2002 Service Manual page 2553

DRIVEABILITY - NGC
Symptom:
P0325-KNOCK SENSOR #1 CIRCUIT
When Monitored and Set Condition:
P0325-KNOCK SENSOR #1 CIRCUIT
When Monitored: With the ignition on and the engine running.
Set Condition: The Knock Sensor circuit voltage falls below a minimum value at idle or
deceleration. The minimum value is from a look-up table internal to the PCM and is based
on engine rpm. DTC also sets if sensor output goes above 5.0 volts. One Trip Fault.
INTERMITTENT CONDITION
KNOCK SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE
KNOCK SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
KNOCK SENSOR SIGNAL CIRCUIT OPEN
KNOCK SENSOR SIGNAL CIRCUIT SHORTED TO KNOCK SENSOR RETURN CIRCUIT
KNOCK SENSOR RETURN CIRCUIT OPEN
KNOCK SENSOR
TEST
1 Ignition on, engine not running.
With the DRBIII , read DTC's and record the related Freeze Frame data.
Is the Good Trip displayed and equal to zero?
Yes → Go To 2
No
2 Turn the ignition off.
Disconnect the Knock Sensor harness connector.
Measure the voltage of the Knock Sensor Signal circuit in the Knock Sensor harness
connector.
Is the voltage above 2.0 volts?
Yes → Repair the short to voltage in the Knock Sensor Signal circuit.
No
3 Turn the ignition off.
Disconnect the Knock Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance between ground and the Knock Sensor Signal circuit at the
Knock Sensor harness connector.
Is the resistance below 100 ohms?
Yes → Repair the short to ground in the Knock Sensor Signal circuit.
No
POSSIBLE CAUSES
ACTION
→ Go To 8
Perform POWERTRAIN VERIFICATION TEST VER - 5.
→ Go To 3
Perform POWERTRAIN VERIFICATION TEST VER - 5.
→ Go To 4
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APPLICABILITY
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All
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