COIL PACK TEST 6: Switching Signal Cylinders 2/5

How To Test The Coil Pack (1990-1998 Chrysler 3.3L, 3.8L) How To Test The Coil Pack (1990-1998 Chrysler 3.3L, 3.8L) How To Test The Coil Pack (1990-1998 Chrysler 3.3L, 3.8L)

In this test step you'll be verifying that the PCM is creating and feeding the Switching Signal (for cylinders 2 and 5) with an LED Light.

This is a very simple and straight forward process in which the ignition coil pack must be connected to its connector.

These are the test steps:

  1. 1

    With an appropriate tool, connect the black lead of the LED Light to the wire identified with the number 4 in the image viewer.

    This is the circuit that feeds the Switching Signal to the ignition coil (within the coil pack) that feeds spark to cylinders 2 and 5 simultaneously.

  2. 2

    Connect the red lead of the LED Light to the battery positive terminal.

  3. 3

    Have your helper crank the car (the car may start so be careful).

  4. 4

    If the car started, have your helper turn it off.

  5. 5

    If the Switching Signal is present, the LED Light will flash on an off the whole time the engine was cranking and during the time it was running.

Let's take a look at what your test results mean:

CASE 1: If the LED light flashed on and off, the whole time the engine was cranking or running, then the PCM is providing the Switching Signal and the circuit is OK. This result confirms that the ignition coil pack is BAD, replace it.

CASE 2: If the LED Light DID NOT flash on and off, the whole time the engine was cranking or running, then there's either an open in the circuit between the connector and the PCM or the PCM is fried (altho' a fried PCM is rare). With this result you have eliminated the coil pack as the source of the misfire condition or No Spark Condition.

COIL PACK TEST 7: Switching Signal Cylinders 3/6

How To Test The Coil Pack (1990-1998 Chrysler 3.3L, 3.8L) How To Test The Coil Pack (1990-1998 Chrysler 3.3L, 3.8L) How To Test The Coil Pack (1990-1998 Chrysler 3.3L, 3.8L)

In this test step you'll be verifying that the PCM is creating and feeding the Switching Signal (for cylinders 3 and 6) with an LED Light.

This is a very simple and straight forward process in which the ignition coil pack must be connected to its connector.

Let's get started:

  1. 1

    With an appropriate tool, connect the black lead of the LED Light to the wire identified with the number 2 in the image viewer.

    This is the circuit that feeds the Switching Signal to the ignition coil (within the coil pack) that feeds spark to cylinders 3 and 6 simultaneously.

  2. 2

    Connect the red lead of the LED Light to the battery positive terminal.

  3. 3

    Have your helper crank the car (the car may start so be careful).

  4. 4

    If the car started, have your helper turn it off.

  5. 5

    If the Switching Signal is present, the LED Light will flash on an off the whole time the engine was cranking and during the time it was running.

Let's take a look at what your test results mean:

CASE 1: If the LED light flashed on and off, the whole time the engine was cranking or running, then the PCM is providing the Switching Signal and the circuit is OK. This result confirms that the ignition coil pack is BAD, replace it.

CASE 2: If the LED Light DID NOT flash on and off, the whole time the engine was cranking or running, then there's either an open in the circuit between the connector and the PCM or the PCM is fried (altho' a fried PCM is rare). With this result you have eliminated the coil pack as the source of the misfire condition or No Spark Condition.