Tacoma PreRunner L4-2.7L (2TR-FE) (2005)
c. Check the voltage.
1. In a circuit in which voltage is applied to the ECU connector terminal, an open circuit can be checked by conducting a voltage check.
FIG 4:
With each connector still connected, measure the voltage between the body ground and these terminals (in this order): 1) terminal 1 of
connector A at the ECU 5 V output terminal, 2) terminal 1 of connector B, and 3) terminal 1 of connector C.
2. Example results:
If your results match the examples above, an open circuit exists in the wire harness between terminal 1 of connector B and terminal 1 of
connector C.
Check Short Circuit
CHECK SHORT CIRCUIT
a. If the wire harness is ground shorted (Fig. 5), locate the section by conducting a resistance check with the body ground.
b. Check the resistance with the body ground.