Pinout Values and Diagnostic Parameters
Inspection Of ECM (PCM) And Its CircuitsCAUTION: ECM (PCM) cannot be checked by itself. It is strictly prohibited to connect voltmeter or ohmmeter to ECM (PCM) with couplers disconnected from it.
ECM (PCM) and its circuits can be checked at ECM (PCM) wiring couplers by measuring voltage.
Voltage Check
1. Remove ECM (PCM) from vehicle.
For H25 engine model, refer to Engine Control Module (ECM) / Powertrain Control Module (PCM) Removal and Installation:H25 Engine.
2. Connect ECM (PCM) couplers to ECM (PCM).
3. Check each terminal voltage with couplers connected.
For H25 engine model, refer to ECM (PCM) Voltage Values Table for Relation of A/C Control for H25 Engine Model.
A/C system wiring circuit diagram
Terminal arrangement of ECM (PCM)
Part 1:
Part 2:
ECM (PCM) Voltage Values Table for Relation of A/C Control