P1622 Cylinder SelectP1623 Transmission Temp Pull-Up Resistor P1432 Fuel Level Sensor 2 Circuit Low Voltage DTC P1647 Driver 1 Line 7 P1357 IC Output High/Pulse Detected when GND_Cyl. What needs to be done is to have the computer scanned to determine what trouble codes are stored in the computer. Test for voltage at both throttle actuator motor control circuits with a DMM. DTC P1632 Theft Deterrent Fuel Disable Signal Received Note: See this page for generic OBD-II codes (they start with P0XXX). Was the battery disconnected? If you disconnect the module or harness, the condition can no longer be duplicated. DTC P1305 Ignition Coil 2 Primary Feedback Circuit The ignition voltage is more than 5.23volts. P1518 Citroen Throttle Actuator Control Module Performance. I can send you the diagnostic flow charts and connector end views for the code P1518, but you will need an advanced scan tool and a DMM to follow the steps. On high current power circuits, this condition may cause permanent increases in the resistance and may cause a device to become inoperative. P1245 Intake Plenum Switchover Valve P1250 Early Fuel Evaporation Heater Circuit and P1586 Cruise Control Brake Switch 2 Circuit Go to Does the scan tool indicate this DTC failed this ignition? cruise, brake. P1620 Low Coolant Circuit P1621 Control Module Long Term Memory Performance P1272 Accelerator Pedal Position Sensor 2 DTC P1519 Throttle Actuator Control (TAC) Module Internal Circuit DTC P1602 Knock Sensor (KS) Module Performance DTC P1689 Delivered Torque Circuit Fault Lets take a different perspective on the ability of a single ground connection to influence engine performance. P1286 Accelerator Pedal Position Sensor 3 Circuit Performance It attaches under the lip of the resonator box in a grommet. ", if this is the correct display, you need to check any/all of the cooling system features and components. In other words, when all the sensors, actuators and wiring circuits pass their respective testing, were basically down to replacing the ECM. P1403 Exhaust Gas Recirculation System Valve 1 DTC P1655 EVAP Purge Solenoid Control Circuit P1231 Injector Circuit Cylinder 4 Intermittent DTC P1559 Cruise Control Power Management Mode DTC P1555 Electronic Variable Orifice Output P1518 Electronic Throttle Module to PCM Communication; P1519 Throttle Actuator Control (TAC) Module Internal Circuit; . What could be the problem? Reduced Engine Power mode. DTC P1570 Traction Control Active - Cruise Control Disabled DTC P1540 Air Conditioning (A/C) Refrigerant Overpressure - Air Conditioning (A/C) DTC P1565 Cruise Servo Position Sensor Thanks for this post. Disconnect the PCM connector that contains the TAC module serial data circuits. Already replaced throttle pedal assembly, throttle body assembly gasket and plug. After bringing the Yukon into the shop, we couldnt duplicate the loss-of-power complaint. You can post now and register later. DTC P1543 A/C System Performance DTC P1511 Throttle Control System - Backup System Performance Wiring Repairs Low Vacuum P1579 P/N to D/R at High Throttle Angle - Power Reduction Mode There are other codes that would show up if the ECM or throttle module themselves were bad. Engine Controls Connector End Views DTC P1504 Vehicle Speed Output Circuit Remember this if you review the stored information in Capture Info. P1825 Internal Mode Switch - Invalid Range DTC P1614 Loss of RIM Serial Data Testing for Intermittent Conditions and Poor Connections This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. DTC P1634 Ignition 1 Switch Circuit Paste as plain text instead, This is due to the many redundant tests run continuously on this system. It is not throwing any check engine lights. and This diagnostic test monitors the accuracy of the serial data transmitted between the TAC module and the PCM. P1406 EGR Valve Pintle Position Circuit P1407 EGR Air Intrusion in Exhaust Supply to EGR Valve make sure starting system & charging system are functioning properly. Thank you in advance for your help. DTC P1544 A/C Refrigerant Condition Very Low No other codes are associated. P1380 Misfire Detected - Rough Road Data Not Available What does it period, beside giving a CODE? P1518 Electronic Throttle Module to PCM Communication I have a 1961 C-10 that I recently swapped a built 5.3/ NV3500 5 speed into. You cannot paste images directly. I Put A 25 Or 30 Amp Fuse And It Blows. P1519 Citroen Electronic . Sensor Low Voltage DTC P1537 A/C Request Circuit Low Voltage DTC P1651 Fan 1 Relay Control Circuit P1278 Accelerator Pedal Position Sensor 1 Circuit High Voltage The Throttle Actuator Control (TAC) module contains data which is essential for proper TAC operation. DTC P1645 Evaporative Emission (EVAP) Vent Solenoid Control Circuit 1) Never trust a voltage drop reading on a circuit that grounds more than one actuator or module because the voltage drop depends very much on peak amperage. in The vehicle blows black smoke and leaks water from exhaust. This happened quite awhile ago but stopped now it seems to do it every day. MIL Request Circuit P1705 P/N Signal Output Circuit P1740 Torque Reduction Signal Circuit P1743 TP Signal from ECM P1760 TCM Supply Voltage Interrupted P1779 Engine Torque Delivered to TCM Signal I just put in a new alternator and now when I turn on the air conditioning I lose rpm's and it will shut off when I am at a stoplight or in idle. DTC P1581 Cruise Move Circuit High Voltage High Voltage DTC P1541 A/C High Side Over Temperature The throttle actuator control (TAC) module and the powertrain control module (PCM) communicate via a dedicated serial data circuit. Finally, at this point in the diagnosis, replacing the ECM appeared to be a cheaper option than spending countless diagnostic hours chasing ghost trouble codes. An improperly torqued TAC module ground may be at fault. Once the PCM finally comes online and communicates with the TAC module, it logs the P1518 and displays reduced power. P1321 Electronic Ignition System Fault Line We had put some oil in before we left on the trip because it was low I have only had this truck for about three months and before I chuck out any more cash I would like to get an idea of what to ask when I go to a repair person because I have been burned by mechanics before (I am a female). P1845 2-3 Shift Solenoid Circuit Low Voltage This third Diagnostic Dilemma was postponed until the school district began its fiscal year in July. You are using an out of date browser. DTC P1599 Engine Stall or Near Stall Detected Cause: This condition may be caused by a buildup of nonconductive insulating oxidized debris (known as fretting corrosion) occurring between two electrical contact surfaces of the connection or connector. P1822 Internal Mode Switch Circuit B High DTC P1503 Theft Deterrent Fuel Enable Signal Not Correct. P1660 Cooling Fan Control Circuits P1661 MIL Control Circuit P1662 Cruise Lamp Control Circuit P1663 Oil Life Lamp Control Circuit P1664 1-4 Upshift Lamp Control Circuit P1665 Driver 3 Line 5P1666 Driver 3 Line 6P1667 Reverse Inhibit Solenoid Control Circuit P1441 Evaporative Emission (EVAP) System Flow During Non-Purge It sounds like a bad fan clutch on the engine. Your link has been automatically embedded. VoltageP1125 APP SystemP1130 HO2S Circuit Low Variance Bank 1 Sensor 1 Please help. Test for poor connections at the TAC module harness connector. DTC P1626 Theft Deterrent Fuel Enable Signal Not Received Intermittent Low Voltage Turn ON the ignition, with the engine OFF, Test for a short to voltage at both throttle actuator motor control circuits with a DMM. And Then There;s A Note That Say Reduced Engine Power. P1368 IC Cylinder 8 Not Toggling After Enable Refer to. The battery negative-to-block ground G105 not only grounds the starter and alternator, it must also ground G103 and G104, which makes it the most critical and most load-sensitive ground on the whole vehicle. The Yukons ECM shares ground G103 at the right cylinder head with the engine oil level switch, intake air temperature sensor, and park/neutral position switch. P1850 Brake Band Apply Solenoid Circuit P1851 Brake Band Apply Solenoid Performance I have not gotten the PCM updates from the dealer yet. Refer to A current DTC, Last Test Failed, clears when the diagnostic runs The technician may not be able to duplicate the intermittent condition. An inspection of the fuses may lead you to the circuit that is shorted to the TAC module ground circuit. Pictures would help, you can upload them using the add image button? P1105 Secondary Vacuum Sensor Circuit P1560 Transaxle Not in Drive - Cruise Control Disabled DTC P1584 Cruise Control Disabled cruise, brake. Pasted as rich text. Well, sorry that there were no responses to this, BUT - problem solved! Low Voltage DTCs set will almost always contain a P1518 and may contain any of the following (P1516, P2108, P0220, P0120, U0107). RespondingP1510 Throttle Control System Performance - Throttle Limitation Low Voltage DTC P1692 Coolant Gage Circuit High Voltage The TAC module continuously test the integrity of this data. P1820 Internal Mode Switch Circuit A Low I believe this model uses an Accelerator Pedal Position Sensor Assy. Test both throttle actuator motor control circuits for continuity to ground with a DMM. P1833 A/T Solenoids Power Circuit - Low Voltage P1483 Engine Cooling System Performance P1500 Starter Signal Circuit P1501 Theft Deterrent System P1501 Vehicle Speed Sensor Circuit Intermittent Still goes reduced engine power under load, climbing a steep hill etc. All information on this site is copyright protected. DTC P1633 Ignition 0 Switch Circuit DTC P1610 Loss of PZM Serial Data DTCs set will almost always contain a P1518 and may contain any of the following (P1516, P2108, P0220, P0120, U0107). DTC P1500 Starter Signal Circuit DTCs set will almost always contain a P1518 and may contain any of the following (P1516, P2108, P0220, P0120, U0107). P1431 Fuel Level Sensor 2 Circuit Performance The power your car's engine is producing is important. Inspect the fuses for the circuits that are in the TAC module harness-i.E. DTC P1567 Active Banking Control Active - Cruise Control Disabled NOTE: This information is presented for information purposes only. Operate the vehicle within the Conditions for Running the DTC. Case closed? Test each serial data circuit between the TAC module 16-way harness connector and the PCM harness connector for an open or high resistance with a DMM. in Wiring Systems. Before it was not that noticeable. Position PerformanceP1517 Electronic Throttle Module P1518 Electronic Throttle Module to PCM Communication Ckt. But, since the data stream anomalies continued to bother me, we used a back-up lamp drawing 2.5 amps of current to load the circuits. DTC P1535 A/C High Side Temperature Sensor Circuit P1270 Accelerator Pedal Position Sensor A/D Converter Error Recently in the past couple weeks I have noticed that when I get on the gas and any speed the truck seems to hesitate all the way through accelerating and even at steady speeds on the highway. This type of fretting may be caused by vibration, thermal cycling and/or poor connection/terminal retention. P1421 Intake Air Low Pressure Switch Circuit High Voltage When the TAC module is unable to write or read data to and from random access memory (RAM), or the TAC module is unable to correctly read data from the flash memory or and internal TAC module processor fault is detected and the Detected Trouble Code (DTC) is set. P1418 Secondary Air Injection System Relay A Control Circuit P1131 HO2S Circuit Low Variance Bank 1 Sensor 2 By now, I had collected a thick folder of case studies and diagnostic information on the Yukon and the P1518 DTC. P1370 IC 4X Reference Circuit Too Many Pulses DTC P1690 ECM Loop Overrun Important:If the Driver Information Center is displaying Reduced Engine Power, go to step 6. Low Voltage P1188 EOT Sensor Ckt. High Voltage P1189 Engine Oil Pressure (EOP) Switch Circuit DTC P1642 Vehicle Speed Output Circuit P1543 A/C System Performance P1544 A/C Refrigerant Condition Very Low Powered by Invision Community, Silikhan Publishing Group, llc & SilveradoSS.com. I did not clear the code, but when I went to restart the truck again, no CEL, no messages, and no reduced power - drove it 1/4 mile down the road, and it ran fine. The TAC module stays powered-up when the ignition switch is turned OFF. P1398 Wheel Speed Sensor 2 - G - Sensor Circuit High Voltage any help would be appreciated. Systems. Buick, Cadillac, and former brands Oldsmobile, Pontiac, and Saturn. Please help me if you can with my problem and help me avoid being taken advantage of again I am on a very tight budget and I miss driving my car. P1203 (Alt. P1396 Wheel Speed Sensor 2 - G - Sensor Circuit Performance It https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing, https://www.2carpros.com/articles/how-to-replace-an-electric-fuel-pump, https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator. With Drive Ratio An improperly torqued TAC module ground may be at fault. and DTC P1652 Powertrain Induced Chassis Pitch Output Circuit Heres how oil can influence carbon deposits. Observe the Capture Info with a scan tool. any help would be appreciated. I took it to the dealer and they said they have never seen this and they will have to call up GM. Repairing Connector Terminals Two DTCs appeared: P1515 (variation between commanded and actual throttle position) and P2135 (TP2 disagrees with TP1 by more than 7.5%). The TAC module and the PCM communicate via a dedicated serial data circuit. Basically it gives you long runners at low revs and short runners at high revs. The TAC module continuously test the integrity of this data. Lets look at a ground distribution chart for the answer. If there are any nationally recognized parts stores near you (Auto Zone, Advance) call and ask if they lend scanners. P1362 IC Cylinder 2 Not Toggling After Enable Plugged the scanner in and got a P1518 code: "Electronic Throttle Module to PCM Communication". DTCP1518 sets if the battery voltage is low. DTC P1693 Tachometer Circuit Low Voltage PerformanceP1405 Exhaust Gas Recirculation System Valve 3 Circuit Testing Test for poor connections at the PCM harness connector. P1107 Manifold Absolute Pressure (MAP) Sensor Circuit Intermittent Low Voltage P1143 HO2S Bank 1 Sensor 3 Lean System or Low Voltage P1351 Ignition Coil Control Circuit High Voltage P1576 BBV Sensor Ckt. Clear any DTCs from the memory that may have been set by Reprogramming. Does the test lamp illuminate on at least 1 side of the fuse? All of the voltage drops were within the time-honored 500 mV range for 12-volt circuits and 50 mV for 5-volt circuits. The Fora platform includes forum software by XenForo. GM TSB: Fretting on Connector Causes ON/DTCs Set By Various Control Modules, Models: 2011 and prior GM passenger cars and trucks. P1503 Theft Deterrent Fuel Enable Signal Not Correct The Yukon, which is owned by a neighboring public school district, failed to start in November 2014. Disclaimer: Links on this page pointing Circuit Description. P1625 TCM System Reset P1626 Theft Deterrent Fuel Enable Signal Not Received Wow, thank you so much. . Wiring Systems. PCM. ) P1587 Cruise Control Clutch Control Circuit Low P1154 HO2S Transition Time Ratio Bank 2 Sensor 1 Circuit Testing My truck was riding fine on a trip suddenly we started to lose power. DTC P1546 A/C Clutch Status Circuit Low Voltage P1522 Park/Neutral to Drive/Reverse at High RPM P1646 Evaporative Emission (EVAP) Vent Solenoid Control Circuit DTC P1545 Air Conditioning (A/C) Clutch Relay Control Circuit For a better experience, please enable JavaScript in your browser before proceeding. What could this be? P1133 HO2S Insufficient Switching Bank 1 Sensor 1 Test the TAC side of the fuse terminal for continuity to ground with a DMM. DTC P1514 Airflow to TP Sensor Correlation High P1257 Supercharger System Overboost P1258 Engine Coolant Overtemperature - Protection Mode Active Given how loose it was, I'm astounded that the truck EVER ran. Does the DMM indicate continuity to ground? VoltageP1122 Throttle Position (TP) Sensor Circuit Intermittent Low You want the engine running and spray on the outside but do direct the stream onto the hoses, if it is a vacuum leak, the engine idle will change speed, then you have detected a leak, repair the vacuum leak and see how it runs!
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