DTC 132

DTC 131 Chart:

Knock Sensor Circuit:

CIRCUIT DESCRIPTION
The knock sensor (KS) is used to detect engine detonation and allow the PCM to retard the Ignition Control (IC) timing based on the signal being received. The circuitry within the knock sensor causes the Powertrain Control Module's (PCM) supplied 5 volt signal to be pulled down, so that under a no knock condition CKT 496 would measure about 2.5 volts. The knock sensor produces an AC signal which rides on the 2.5 volts DC voltage. The amplitude and signal frequency is dependent upon the knock level.
If CKT 496 becomes open or shorted to ground, the voltage will either go above 3.5 volts or below 1.5 volts. If either of these conditions are met for 20 seconds, DTC 132 will be stored.

DTC 132 WILL SET WHEN
Voltage on CKT 496 goes above 4.2 volts or equals 0 volts.

ACTION TAKEN (PCM WILL DEFAULT TO)
With a current DTC 132 set, the PCM will illuminate the Malfunction Indicator Lamp (MIL) (Service Engine Soon) for the remainder of the key cycle and retard spark timing ("Knock Retard") by 10 degrees.

DTC 132 WILL CLEAR WHEN
The fault no longer exists.

DTC CHART TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.

1. Checking if fault is current.
2. Checking CKT 496 for an open or short.
3. Checking internal resistance of the knock sensor.

DIAGNOSTIC AIDS
Check CKT 496 for a intermittent open or short to ground. Also check for proper installation of PROM.
If the knock sensor CKT 496 is routed too close to secondary ignition wires it may induce a voltage and cause a false knock signal.
Refer to Detonation, Spark Knock in Diagnosis by Symptom. Detonation/Spark Knock/Pings