If you have a scan tool, command the PCM to perform the actuator test mode to test the ignition coils.
Next, use a digital meter to check the voltage output at the body control module form the ignition switch. With the key out, you should see 4.6 volts, key in 4.6 volts, accessory position 3.2 volts, unlock 2.2 volts, run 1.12 volts, start 0.41 volts.
If you’re not seeing those voltages, then the BCM will not send the proper digital message to the PCM and the main computer will not know the engine is cranking. So it will set the trouble codes P0351, P0352, P0353, when in fact the problem lies in the ignition switch. The fix is to replace the ignition switch if the voltages aren’t correct.
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© 2012 Rick MuscoplatPosted on by Rick Muscoplat