Inspection For PCM Power Circuit Open/Short Circuit

1. Turn IGN Switch OFF.
2. Disconnect the PCB block "PCB-C" connector and the PCM connector.
3. Using a multi-tester, check the resistance of the power side terminal of the "PCB-C" connector and the body ground to check whether the wiring is short-circuited.
4. Using a multi-tester, check the resistance between the "PCB-C" connector power side terminal and the PCM power terminal to check if the wiring is disconnected.
5. Check the resistance to check for disconnection or short-circuiting of the wiring line on the PCM engine control relay ON power side.

   Information 

   If the resistance value is measured during short-circuit inspection, short-circuit with peripheral parts/wiring can be suspected.

   While shaking the wiring, Inspection For short-circuit area through the change value of resistance.

   Information 

   If excessive resistance is measured during disconnection inspection, short-circuit with other wiring/wiring failure/intermediate connector failure are suspected.

   In this case, a problem could occur as normal voltage/current is not energized to the circuit.

   Locate the faulty part through inspection, and repair it.

   List of Inspection	Normal value	Inspection Condition	Probe (+)	Probe (-)
   PCB Block ←→ PCM Short to wiring harness	Infinity (∞) Ω	IGN Switch "OFF" Separation of PCB block PCB-C connector Separation of PCM connector	PCB block PCB-C connector side 2. Main relay "ON" power	Chassis Ground

OK 

Go to "Inspection For PCM Ground Circuit"  procedure.

NG 

Repair the wiring and replace the assembly.

If there is no problem with the wiring, Inspection For PCM.

Go to "Final DTC Checking"  procedure.