Camry Sedan L4-2.4L (2AZ-FE) (2003)
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.
As shown in Fig. 4, with each connector still connected, measure the voltage between the body ground and terminal 1 of connector "A" at
the ECU 5 V output terminal, terminal 1 of connector "B", and terminal 1 of connector "C", in that order.
2. If the results are:
5 V: Between terminal 1 of connector "a" and body ground
5 V: between terminal 1 of connector "b" and body ground
0 V: between terminal 1 of connector "C" and body ground
Then it is found out that there is an open circuit in the wire harness between terminal 1 of "B" and terminal 1 of "C".
3. CHECK SHORT CIRCUIT
a. If the wire harness is ground shorted as in Fig. 5, locate the section by conducting a "continuity check with the body ground".
b. Check the continuity with the body ground.
1. Disconnect connectors "A" and "C" and measure the resistance between terminals 1 and 2 of connector "A" and the body ground.
Resistance: 1 MOhm or higher
HINT: Measure the resistance while lightly shaking the wire harness vertically and horizontally.
In the case of Fig. 6:
Between terminal 1 of connector "A" and body ground -> Continuity (short)
Between terminal 2 of connector "A" and body ground -> No continuity
Therefore, it is found out that there is a short circuit between terminal 1 of connector "A" and terminal 1 of connector "C".