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If the sensor has been replaced, the most likely cause of the recurring trouble code is a wiring issue. I suggest following the diagnostic procedure below to figure out the source of the issue.
Before beginning this procedure, you'll need to familiarize yourself with the use of a DVOM (Digital Volt Ohm Meter). See the link below for a quick tutorial. Also, you'll need to know the location of the PCM. See attachment 4 below for this information.
1. Turn the ignition switch to ON.
2. Unplug the ECT 2 connector.
3. Measure voltage between ECT sensor 2 connector terminal No. 1 and body ground
(see attachment 1).
Is there about 5 V?
YES - Go to step 4.
NO - This indicates an open circuit somewhere between the sensor connector and the
PCM. At this point you can either trace the entire circuit and look for the break or
you can run a new circuit from the PCM to the sensor. See attachment 3 for the
circuit location at the PCM connector.
4. Disconnect ECM/PCM connector A (49P).
5. Check for continuity between ECT sensor 2 2P connector terminal No. 2 and ECM/PCM connector terminal A10 (see attachment 2).
Is there continuity?
YES - This indicates the issue you're dealing with is intermittent. Try making the above
measurements again while having a helper wiggle the wire harness.
NO - This indicates there is an open circuit somewhere between the sensor connector
and the PCM. At this point you can either trace the entire circuit and look for the
break or you can run a new circuit from the PCM to the sensor.
Let us know what you find!
Images (Click to enlarge)
Sunday, September 22nd, 2019 AT 9:40 AM