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

• Check fuse 11 /B18. If the fuse is blown check the circuit after the fuse for a short-circuit to ground according to See: Diagnostic Trouble Code Tests and Associated Procedures\Related Tests, Information and Procedures\Checking Wiring and Terminals
• Check fuse 11 /B14. If the fuse is blown check the circuit after the fuse for a short-circuit to ground according to See: Diagnostic Trouble Code Tests and Associated Procedures\Related Tests, Information and Procedures\Checking Wiring and Terminals
• 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 See: Diagnostic Trouble Code Tests and Associated Procedures\Related Tests, Information and Procedures\Checking Wiring and Terminals
• Check engine control module (ECM) ground terminal for contact resistance and oxidation according to See: Diagnostic Trouble Code Tests and Associated Procedures\Related Tests, Information and Procedures\Checking Wiring and Terminals

Remedy as necessary

Other information

• To connect the breakout box, See: Reading and Clearing Diagnostic Trouble Codes\Scan Tool Connecting\Connecting the Breakout Box (ECM)
• 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) #B 11 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, See: Locations
• For information about signals, See: Pinout Values and Diagnostic Parameters\Signal Specifications, ECM
• For information about circuit see the relevant wiring diagram