Civic L4-1.8L CNG (2008)
Is there continuity?
YES - Go to step 82.
NO - Update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If the symptom/indication goes away
with a known-good PCM, replace the original PCM,
82. Continue to check for continuity between PCM connector terminal A19 and body ground, while disconnecting these connectors, one at a time:
-
A/C pressure sensor 3P connector
-
Fuel rail pressure sensor
-
FTP sensor 3P connector
Does continuity go away when any of the above sensors are disconnected?
YES - Replace the sensor that caused an open when it was disconnected.
NO - Repair short in the wire between the PCM (A19) and the A/C pressure sensor, the fuel rail pressure sensor, or the FTP sensor.