Checking Power and Ground Terminal - Engine Management System

Checking power supply and ground terminal, engine control module (ECM)

Checking power supply and ground terminal, engine control module (ECM)

Checking the power supply
- Check the fuse for power supply to engine control module (ECM) terminal #A17 (#A17).
If the fuse is blown, check the circuit for a short-circuit to ground
- Check the fuse for power supply to engine control module (ECM) terminal #B11 (#B21).
If the fuse is blown, check the circuit for a short-circuit to ground
- Check the power supply to engine control module (ECM) terminal #A17 (#A17). The voltage must be approximately battery voltage when the ignition is on.
If the voltage is incorrect, check the cable between ignition switch terminal 30 and system relay terminal #3 and the cable between system relay terminal #5 and engine control module (ECM) terminal #A17 (#A17). Check for an open-circuit
- Check the power supply to engine control module (ECM) terminal #B11 (#B21). The voltage must be approximately battery voltage when the ignition is on.
If the voltage is incorrect, check the cable between ignition switch terminal 30 and engine control module (ECM) terminal #B11 (#B21). Check for an open-circuit.

Checking ground terminal
- Check the ground leads between engine control module (ECM) terminals #A53 (#A53), #A54 (#A54), #A63 (#B3) and the common ground terminal in the body for the wiring. Check for an open-circuit
- Check the ground terminal in the body for the engine control module (ECM). Check for contact resistance and oxidation.
Remedy as necessary

Other information
- To connect the breakout box, see Connecting the breakout box, B5244T5, B5254T2 Connecting the Breakout Box
- For information about signals on 5 cylinder engines, see Signal specification Signal Description / Specification
- For information about signals on 6 cylinder engines, see Signal specification Signal Description / Specification
- For further information about the fuses and relays, see the Wiring Diagram
- Checking wiring and terminals Checking Wiring And Terminals





Was a fault detected?

Yes - Fault Found

No - No Fault Found

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