Ok lets see if you can identify the fault with the communication end.Below is the PCED pinpoint test that you should be familiar with using:
Note: The diagnostic tool resets if battery voltage is less than 9.5 volts. If carrying out repeated self-tests, disable the glow plug control module (GPCM) and disregard the glow plug codes while GPCM is disabled. If equipped with a power take-off (PTO) system, it must be disabled while carrying out the PCM self-tests.
Was the correct self-test procedure used?
Is system passed obtained?
Are the voltages greater than 10.5 volts?
Are the resistances less than 5 ohms?
Are the resistances greater than 10,000 ohms?
Note: If a sensor is shorted internally the reference voltage will be within the specification when the sensor in question is disconnected.
Is the voltage between 4.5-5.5 volts?
Note: If a sensor or actuator is shorted internally the reference voltage will be within the specification when the sensor or actuator in question is disconnected.
Note: Monitor the voltage change while connecting the sensors and the actuator. If a sensor or actuator is shorted internally the reference voltage will not be within the specification when the sensor or actuator in question is connected.
This pinpoint test is intended to diagnose only the following:
CAUTION: The PCM harness connectors must be properly seated and the connector latch properly attached to eliminate possible driveability concerns or a no start condition. Installing the PCM connectors on an angle may cause an improper connection, misdiagnosis, and damaged components. Install the connector until the lever pivots and seats itself. Apply light pressure to get the connector into position on the PCM and then fully seat the connector.
Note: Visually inspect the harness connectors for corrosion, damage, proper mating, and correct pin tension.
Drivers side fender as shown in the picture below: