Power Circuits (Cranking)

Using voltmeter, backprobe ECM connector crank signal terminal. See appropriate wiring diagram in WIRING DIAGRAMS article. Hold ignition switch in START position. Battery voltage should exist between ECM terminal and ground only when ignition switch is in START position.
If battery voltage does not exist, check fusible link. Fusible links are in engine compartment. If fusible link is okay, check for open wire between fusible link and ECM terminal, or for defective ignition switch.

ECM POWER TERMINAL IDENTIFICATION

Application/Terminal No.

Wire Color

Ignition On

⁽¹⁾

39 ⁽²⁾

⁽¹⁾

⁽¹⁾	See appropriate wiring diagram in WIRING DIAGRAMS article.

⁽²⁾	Back-up power supply. Battery voltage at all times.