P132

DTC P132:

Knock Sensor Circuit:

CIRCUIT DESCRIPTION
This diagnostic test checks for a Knock Sensor wiring problem. The circuitry within the Knock Sensor causes the Powertrain Control Module's (PCM) supplied 5 volts signal to be pulled down, so that under no knock condition CKT 496 will 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 of the AC signal is dependent upon the knock level.

If CKT 496 becomes open or shorted, the voltage will either go above 4.2 volts or below 0.3 volt. If either of these conditions are met for 0.4 second, Code P132 is set.

TEST CONDITIONS
1. Coolant Temperature 40°C or greater.
2. Battery voltage 11 or greater volts.

FAILURE CONDITIONS
1. Knock Sensor feedback voltage greater than:
- 4.48 volts (295 hp VIN 9)
- 4.2 volts (270 hp VIN Y)
OR
2. Knock Sensor feedback voltage 0.3 volt or less.

ACTION TAKEN
PCM turns "ON" the Malfunction Indicator Lamp (MIL) (Service Engine Soon).

NOTES ON FAULT TREE
1. Checking if Code P035 is also set. A REF LO problem can cause other ignition problems.
2. Checking for proper operating voltage of 0.3 to 4.2 volts present at PCM terminal "1A13."
3. Checking CKT 496 for a short to ground. If circuit OK, knock sensor must be bad.
4. Checking for a short to voltage on CKT 496.
5. Checking CKT 496 for an open.