Primary/Secondary Ignition Testing So the whole picture here is that the ECM sees the CKP input and sends a signal out over the IC circuit to the ICM or the ignition coil (8.1L) to trigger the coil primary which induces voltage into the secondary ignition system. A breakdown anywhere in the system causes failure of the whole system. Taking what you have learned here, answer the following questions on the 5.0GXi-C engine. 1. In the picture below, which terminal (at the ignition coil) is the ignition coil primary ground circuit? TERMINAL ____________
2. With the ignition switch on and engine not running, disconnect the ICM connector and measure the voltage at pin D. What is the reading? __________ volts 3. What does this voltage reading tell you about the condition of the coil primary circuit? _____________________________________________________________________
128
