PCV Heater: Testing and Inspection

POSITIVE CRANKCASE VENTILATION (PCV) VALVE HEATER FITTING INSPECTION [MZI-3.7]

Resistance Inspection
1. Disconnect the negative battery cable.
2. Disconnect the PCV valve heater fitting connector.
3. Measure the resistance between the PCV valve terminals.
- If within the specification, perform out the "Circuit Open/Short Inspection".
- If not within the specification, replace the PCV valve heater fitting.

PCV valve heater fitting resistance
10-35 ohms






Circuit Open/Short Inspection
1. Disconnect the PCM connector.
2. Inspect the following wiring harnesses for open or short circuit (continuity check).












Open circuit
- If there is no continuity, there is an open circuit. Repair or replace the wiring harness.
- PCV valve heater fitting terminal A and main relay No.1 terminal D
- PCV valve heater fitting terminal B and PCM terminal 2AU

Short circuit
- If there is continuity, there is a short circuit. Repair or replace the wiring harness.
- PCV valve heater fitting terminal A and power supply
- PCV valve heater fitting terminal A and body ground
- PCV valve heater fitting terminal B and power supply
- PCV valve heater fitting terminal B and body ground