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Fuel injected engine trouble codes through 1995, except with 4L60E and 4L80E transmissions.

Code 43- Electronic Spark Control (ESC) circuit Signal to the ECM/PCM has remained low for too long or the system has failed a functional check.

Fuel injected engine trouble codes through 1995 with 4L60E transmissions.

DTC 43- Knock Sensor (KS) Circuit Signal to the PCM has remained too low for too long, or the system has failed a functional check.

Fuel injected engine trouble codes through 1995 with 4L80E transmissions.

DTC 43- Knock Sensor (KS) Circuit Signal to the PCM has remained too low for too long, or the system has failed a functional check.

Knock Sensor

OPERATION

Located in the engine block, the knock sensor retards ignition timing during a spark knock condition to allow the ECM to maintain maximum timing advance under most conditions.

|Fig. 1: Exploded view of the knock sensor location-4.3L engines |

|[pic] |

|Fig. 2: Exploded view of the knock sensor location — 5.0L, 5.7L and 7.4L engines |

|[pic] |

TESTING

1. Connect a timing light to the vehicle and start the engine.

2. Check that the timing is correct before testing knock sensor operation.

3. If timing is correct, tap on the front of the engine block with a metal object while observing the timing to see if the timing retards.

4. If the timing does not retard the knock sensor may be defective.

|Fig. 1: Knock Sensor (KS) wiring diagram — 4.3L, 5.0L 5.7L engines |

|[pic] |

5.

|Fig. 2: Knock Sensor (KS) wiring diagram — 7.4L engines |

|[pic] |

REMOVAL & INSTALLATION

1. Disconnect the negative battery cable.

2. Disengage the wiring harness connector from the knock sensor.

3. Remove the knock sensor from the engine block.

To install:

4. Apply a water base caulk to the knock sensor threads and install the sensor in the engine block.

WARNING

Do not use silicon tape to coat the knock sensor threads as this will insulate the sensor from the engine block.

5. Engage the wiring harness connector.

6. Connect the negative battery cable.

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