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Posted on Jan 02, 2017
That is a hard problem to pin point without knowing what codes the computer has stored. It can be any number or sensors or engine problems.
You can go to most auto parts stores and they will pull the codes for you for free.
Posted on Jul 27, 2009
DO A LITTLE TUNE UP.CHANGE FUEL FILTER * AIR FILTER * SPARK PLUG * WIRES *CLEAN FUEL INJECTORS.CHECK TRANSMISSION FLUID.MOST TIME YOU RUN AC IN CAR YOUR ENGINE HAS TO BE WELL TUNED.BECAUSE THE AC WILL TAKE SOME POWER FROM ENGINE.
Posted on Aug 23, 2009
This problem is directly related to the APP (Accelerator Pedal Position) Sensor and the associated Module located on the Firewall immediately to the Left side of the Power brake booster unit. Disconnect the Negative Battery Cable before doing anything else! The Gray Connector is the one closest to the Left Front Fender. All of the leads to this connector are associated with the Accelerator Pedal Position Sensors and many other circuits controlling the electronics which operate the Air Valve Butterfly located on the front of the Intake Plenum. Corrosion of the contacts in the Gray Connector is common. Carefully clean the contacts, re-assemble the connector, re-connect the Negative Battery Cable and start the engine. If the problem is gone you should be home free. Another cause is Squirrels or Chipmunks eating through the insulation of the wires inside the Plastic Wire Loom. In my case this was what happened and I had to splice 6 of the wires which had been eaten through and broken. There are numerous Factory Service Bulletins covering related problems including a Program Update of the ECM.
Posted on Apr 26, 2010
SOURCE: i have a 2003 chevy
P1518 CHEVROLET - Electronic Throttle Module to PCM Communication
Customers may have a concern of lack of power and engine light on. DTCs set will almost always contain a P1518 and may contain any of the following (P1516, P2108, P0220, P0120, U0107). An improperly torqued TAC module ground may be at fault. The Ground is listed as G104 on TAC module schematic which is incorrectly labeled on SI document ID 855376. The correct ground is G103. The locator for SI states that G103 is located on the left hand side which is incorrect. However, there have been field reports stating that G104 has also corrected this condition. G104 is a horizontal bolt in the rear of the left head and extremely difficult to reach. G104 should also be tightened at the same time.
There have also been field cases where ground G110 on the outer drivers side frame rail caused a P1518 code and an intermittent connection at splice 102 on the intake.
All published SI diagnostics should be followed in addition to following the recommendation listed.
Tighten ground G103 located behind the right cylinder head (passenger side) just below the head and mounted into the block. The ground uses a 13 mm bolt head mounted vertically to the engine block just above the bell housing.
• DTC P1518 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 P1518. Clear any DTCs from memory that may have set from the low battery voltage condition.
• DTC P1518 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 P1518 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 P1518 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.
Conditions for Setting the DTC
• The TAC module detects that the predicted and the actual throttle positions are not within a calibrated range of each other.
• The PCM and the TAC cannot determine the throttle position.
• Both of the TP sensors are invalid.
• All of the above conditions are met for more than 1 second.
A vehicle may be brought into the dealer for a reduced power message, and DTCs P0120, P0220, P1516, P2101, or P2135.
The Throttle Actuator Control (TAC) / throttle body type trouble codes, may be caused by a loose wiring crimp at the throttle body connector, or a broken throttle body circuit.
Complete the current SI diagnostics for any symptoms or trouble codes found. If a intermittent T/P or TAC module type code is occurring complete the inspections below.
Inspect all related throttle body terminals for a loose wiring crimp. The loose crimp may be difficult to find, and the poor connection will be between the terminal and the copper strands of the wire. Wiggle test the individual throttle body circuits to see if the concern can be duplicated.
Inspect the related circuits for broken wires inside the insulation. The outer wire insulation may look fine, but the internal copper strands may be partially broken. Breaks in the wires usually occur within 1 to 4 inches of the throttle body connector. Wiggle testing may also induce a trouble code to set.
On C/K trucks complete SI procedures for voltage drop on grounds G103 and G104. Grounds G103 or G104 may be loose or corroded.
If a terminal crimp or a broken wire has been found, repair or replace only the circuits involved.
Keep us updated.
Posted on Apr 05, 2011
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