Checking Power and Ground Terminal - Engine Management System

Checking Engine Control Module (ECM) Power Supply And Ground Terminal







Checking power supply
- Check fuse 11 B/18. If the fuse is blown check the circuit after the fuse for a short-circuit to ground according to Checking wiring and terminals. Permanent faults (under Related Tests and Information)
- Check fuse 11/B14. If the fuse is blown check the circuit after the fuse for a short-circuit to ground according to Checking wiring and terminals. Permanent faults (under Related Tests and Information)
- Check power supply to #A70. Voltage should be approximately battery voltage.
- Check power supply to #B11. Voltage should be approximately battery voltage.

Checking ground terminal
- Check ground lead between engine control module (ECM) #A53, #A54, #A63 and right side member ground terminal 31/96 for an open-circuit according to Checking wiring and terminals. Permanent faults (under Related Tests and Information)
- Check engine control module (ECM) ground terminal for contact resistance and oxidation according to Checking wiring and terminals. Permanent faults (under Related Tests and Information)

Remedy as necessary

Other information
- To connect the breakout box, see Connecting the breakout box (under Scan Tool Connecting)
- Power supply to the engine control module (ECM) #A70 is from fuse 11 B/18 via the system relay.
- Power supply to engine control module (ECM) #B11 is from fuse 11 B/14 via terminal 30+.
- The engine control module (ECM) ground terminal is common to engine control module (ECM) terminals #A53, #A54 and #A63.
- For further information about the location of ground terminals on the B52X4 T, see Location of components, B6304 S, see Location of components or B6284 T, see Location of components
- For information about signals on 5-cyl, see Signal Specification (under Diagnostic Parameters and Pinout Values).
- For information about signals on 6-cyl, see Signal Specification (under Diagnostic Parameters and Pinout Values).
- For information about circuit see the relevant wiring diagram

Was a fault detected?

YES: Refer to Trouble Code Descriptions. Diagnostic Trouble Code Descriptions
NO: Continue with Test (Fault-Tracing Information - Permanent Fault). Fault-Tracing Information - Permanent Fault