The Circuit Descriptions

How To Test The Ignition Module And Crank Sensor (GM 2.2L) How To Test The Ignition Module And Crank Sensor (GM 2.2L)
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Here are brief descriptions of the circuits that we'll be testing. The module connector will have the same letters on it.

Connector With 6 Wires

  • A- PURPLE wire.
    • Crankshaft position sensor circuit.
  • B- WHITE wire.
    • 1-4 Ignition Coil Control Signal (comes from the ECM). The service literature will call this the Ignition Control Signal A.
  • C- ORANGE wire.
    • 2-3 Ignition Coil Control Signal (comes from the ECM). The service literature will call this the Ignition Control Signal B.
  • D- PURPLE with WHITE stripe wire.
    • 7X Reference Signal (goes to the ECM).
  • E- YELLOW wire.
    • Crankshaft position sensor circuit.
  • F- RED with BLACK stripe wire.
    • Ground circuit for ECM.

Connector With 2 Wires

  • A- BLACK (or BLACK with WHITE stripe) wire.
    • Engine Ground (for the module).
  • B- PINK wire.
    • 12 Volts with ignition in the ON position.

You're probably thinking that there are too many wires to test. Don't worry, you'll see just how easy it is to test this module. All right, let's get started!

TEST 1: Testing For 12 Volts

How To Test The Ignition Module And Crank Sensor (GM 2.2L)

We'll begin by checking that the ignition control module on your Chevy Cavalier (or Pontiac Sunfire) is receiving 12 Volts.

I recommend using a wire piercing probe to accomplish all of the tests in this article (to see an example of this tool, go here: Wire Piercing Probe). Whatever method you use, the key here is to be careful. Remember to use common sense and take all safety precautions.

  1. 1

    Put the multimeter in Volts DC mode.

  2. 2

    Disconnect the ignition control module (ICM) from its 2-wire electrical connector.

  3. 3

    Connect the black multimeter test lead to the battery negative (-) terminal.

  4. 4

    Probe the pink (PNK) wire of the connector with the red multimeter test lead.

  5. 5

    Turn key to the ON position but don't crank or start the engine.

  6. 6

    You should see 10 to 12 Volts on the multimeter.

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

CASE 1: The multimeter registered 12 Volts. This is the correct test result.

The next step is to go to: TEST 2: Testing The Ground Circuit.

CASE 2: The multimeter DID NOT register 12 Volts. You must find out why you're missing this voltage.

Without this voltage the module will not work. With this result you have eliminated the ignition module and crank sensor as the cause of the no-start condition on your Cavalier (or Sunfire).

Chevrolet Vehicles:
  • Cavalier 2.2L
    • 1997, 1998, 1999, 2000, 2001, 2002
  • S10 Pickup 2.2L
    • 1997, 1998, 1999, 2000, 2001, 2002, 2003
GMC Vehicle:
  • Sonoma 2.2L
    • 1997, 1998, 1999, 2000, 2001, 2002, 2003
Isuzu Vehicles:
  • Hombre 2.2L
    • 1997, 1998, 1999, 2000
Pontiac Vehicle:
  • Sunfire 2.2L
    • 1997, 1998, 1999, 2000, 2001, 2002