TROUBLE CODE 2004 ISUZU U0107

Did you read the FSM first ? seems not. Try Mitchells ?
the book flat tells you what to do. and why,,,, read excerpts here.
2004,
u codes.,
0107, ( this is in lay terms, a COMMUNICATIONS failure)
the answers by others above are wrong.!
are you sure its only ONE CODE< if its more, then that
MATTERS BIG TIME. !!!
why not get the car serviced and not play this game.
are you up to computers and networking? My guess not but?????

more?
and can be just a low battery... (main car battery)
so check it first, and all fuses, and then reset it and drive
to see if it comes back. (same with all failures)
This error can happen if one plays with wiring with the battery connected, that means , pulling connectors,or jumpering wires.
never hot wire, any wires on this car, or you will pay.
one can also get this if battery drains dead, light on
or someone jumper cable jump start the car, did you????
I say ,reset it now, and see if it come back.
same answer for all modern cars.. this.

4.2 or 5.2L engine, must we guess this???????
toss coin, 4.2
I pasted of fsm pages. (direct quotes)

DTC U0107 Circuit Description The throttle actuator control (TAC) module and the powertrain control module (PCM) communicate via a dedicated serial data circuit. This serial data circuit is separate from any other serial data circuit on the vehicle. Accurate transmitting and receiving of serial data requires not only good circuit integrity but also adequate system voltage. This diagnostic test monitors the accuracy of the serial data transmitted between the TAC module and the PCM. If the PCM detects a loss of data or invalid data, this DTC sets.
Conditions for Running the DTC

• The ignition switch is in the crank or run position.
• The ignition voltage is more than 5.23?volts.

• Invalid or missing serial data messages are detected for a predetermined amount of time.
• The above condition is met for more than 1?second.

• The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
• The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame and/or the Failure Records.
• The control module commands the TAC system to operate in the Reduced Engine Power mode.
• A message center or an indicator displays Reduced Engine Power.
• Under certain conditions the control module commands the engine OFF.

• The control module turns OFF the malfunction indicator lamp (MIL) after 3?consecutive ignition cycles that the diagnostic runs and does not fail.
• A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
• A history DTC clears after 40?consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
• Clear the MIL and the DTC with a scan tool.

• DTC?U0107 sets if the battery voltage is low. If the customer's concern is slow cranking or no crank because battery voltage is low, ignore DTC?U0107. Clear any DTCs from memory that may have set from the low battery voltage condition.
• DTC?U0107 sets when there is a short to B+ on the TAC module ground circuit. Inspect the fuses for the circuits that are in the TAC module harness-i.e. cruise, brake. An inspection of the fuses may lead you to the circuit that is shorted to the TAC module ground circuit.
• DTC?U0107 sets if the TAC module ignition feed circuit is shorted to a B+ supply circuit. The TAC module stays powered-up when the ignition switch is turned OFF. When the ignition switch is turned ON, the TAC module is powered-up before the PCM. DTC?U0107 sets because no communication is detected by the TAC module from the PCM. Inspect related circuits for being shorted to a B+ supply circuit.
• Inspect the TAC module power and ground circuits and the TAC module/PCM serial data circuits for intermittent connections.
• Inspect the TAC module connectors for signs of water intrusion. If water intrusion occurs, multiple DTCs may set without any circuit or component conditions found during diagnostic testing.
• When the TAC module detects a problem within the TAC system, more than 1 TAC system related DTC may set. This is due to the many redundant tests run continuously on this system. Locating and repairing an individual condition may correct more than 1 DTC. Remember this if you review the stored information in Capture Info.
• For an intermittent condition, refer to Intermittent Conditions.

This step determines if the ignition relay is supplying a voltage to the ETC fuse.

Increasing the engine speed to 3,000?RPM aids in locating a shorted throttle actuator motor control circuit. Depending on the polarity of the throttle actuator motor transistors, this DTC may not set with a fault in the control circuits. The throttle actuator motor is a bi-directional DC motor. Raising the engine speed changes the polarity of the transistors in the throttle actuator motor. This occurs because 1 set of the transistors are low, 0?volts, and the other set are high, B+. Therefore, if 1 set of transistors are at a low voltage and the corresponding circuit is shorted low, DTC?U0107 will not set. When the polarity of the transistors change, this DTC sets. If this DTC does not fail this ignition, continue to monitor this DTC status while moving related harnesses and connectors.

Locating and repairing an individual condition may correct more than 1 DTC.

Usually requires a new throttle actuator which may only be available as part of a throttle body assembly