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How to trouble shoot the tachometer to determine if it's the tac or the drive?

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  • Chevrolet Master
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Take out the speed sensor from the gearbox but leave it connected to the wiring. Start the engine and keep the gearbox in Park. Put the shaft of the sensor in a drill and start rotating it - the speed indicator should move proportionally with the speed of rotation of the shaft. If it doesn't then a part is faulty, start by replacing the sensor.

Posted on Jul 14, 2010

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Posted on Jan 02, 2017

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2009 Chevy Silverado 1500 cruse stoped working but light is still on.


This is very complex , first thing is have the vehicle checked for DTC'S - diagnostic trouble codes stored in the BCM , PCM !
The body control module (BCM) monitors the signal circuit of the cruise control switches. The BCM relays the cruise control switch status to the engine control module (ECM) via the GMLAN serial data circuit. The ECM uses the status of the cruise control switch to determine when to capture and maintain the vehicle speed. The ECM monitors the vehicle speed signal circuit in order to determine the desired vehicle speed. The ECM uses the throttle actuator control (TAC) motor in order to maintain the vehicle speed. For further information on the TAC System, refer to Throttle Actuator Control (TAC) System Descriptionfor the 4.3L engine or Throttle Actuator Control (TAC) System Description for the 4.8L, 5.3L, 6.0L, 6.2L or 7.0L engines.
Your best bet would be to take to the dealer !
Yo

Oct 24, 2016 | 2009 Chevrolet Silverado 1500

1 Answer

Where can I find the cruise control fuse on a 2008 hhr


The odds of a fuse being the problem with a non operating cruise control are astronomical . Knowing how the cruise control works is a must in trouble shooting . The different modules involved ,the GMLAN serial data network etc... Here is the factory repair manual description .
Cruise Control Description and Operation
Cruise control is a speed control system that maintains a desired vehicle speed under normal driving conditions at speeds above 40 km/h (25 mph). Steep grades may cause variations in the selected vehicle speeds.
The following are the main components of the cruise control system:
?€¢
The accelerator pedal


?€¢
The brake pedal position (BPP) sensor


?€¢
The body control module (BCM)


?€¢
The cruise on/off switch


?€¢
The + RES switch (equivalent to resume/accel switch)


?€¢
The - SET switch (equivalent to set/coast switch)


?€¢
The engine control module (ECM)


?€¢
The clutch pedal position (CPP) sensor, if equipped with a manual transmission


?€¢
The throttle actuator control (TAC) motor


?€¢
The vehicle speed sensor

The body control module (BCM) monitors the signal circuit of the cruise control switches, which are located on the steering wheel. The BCM relays the cruise control switch status to the engine control module (ECM) via the GMLAN serial data circuit. The ECM uses the status of the cruise control switch to determine when to capture and maintain the vehicle speed. The ECM monitors the vehicle speed signal circuit in order to determine the desired vehicle speed. The ECM uses the TAC motor in order to maintain the vehicle speed. For further information on the TAC system, refer to Throttle Actuator Control (TAC) System Description for the 2.2L engine or to Throttle Actuator Control (TAC) System Description for the 2.4L engine.
Ignition voltage is supplied to the cruise control switch from the 2-ampere EPS fuse located in the integrated BCM fuse block. The cruise control function switches are arranged in a resistive ladder design, with each cruise control function switch having a different resistance value. The BCM detects a specific voltage value that is associated with the cruise control function switch being activated. When the normally open cruise control on/off switch is turned ON, the switch closes and the BCM sends a GMLAN serial data message to the ECM indicating that the on/off switch is active. Similarly, when the normally open + RES switch or the normally open - SET switch are pressed, the switch closes and the BCM detects the predetermined voltage signal on the cruise control switch signal circuit. The BCM sends a GMLAN serial data message to the ECM indicating that the + RES switch or the - SET switch is active. The + RES switch or the - SET switch will remain inactive when the BCM has not received the predetermined voltage signal from the on/off switch.
Unless the air bag light is lit too , your best bet would be to take your vehicle to a qualified repair shop.

Aug 09, 2016 | 2008 Chevrolet Chevrolet HHR LT

1 Answer

Have an 03 suberban z71 today wife was driving and lost power to the pettle and overheating transmission light came on how can i fix this


Check engine light come on ? Any messages on DIC - driver information center , reduced power ,if the vehicle has it . Any other lights lite , yellow wrench symbol . Do you own a scan tool ? a professional grade scan tool , not a code reader . Do you know how to do electrical trouble shooting ? Suggest you go on you tube an check out videos on electronic throttle control .
Throttle Actuator Control (TAC) System Description
The throttle actuator control (TAC) system delivers improved throttle response and greater reliability and eliminates the need for mechanical cable. The TAC system performs the following functions:
• Accelerator pedal position sensing
• Throttle positioning to meet driver and engine demands
• Throttle position sensing
• Internal diagnostics
• Cruise control functions
• Manage TAC electrical power consumption
The TAC system components include the following:
• The accelerator pedal position (APP) sensors
• The throttle body assembly
• The throttle actuator control module
• The powertrain control module (PCM) .I strongly suggest you take it to a ASE certified repair shop

Feb 15, 2016 | Cars & Trucks

1 Answer

I have a 2003 Cadillac CTS. It continues to go into reduced power mode. How do I correct that.


Are you getting a ENGINE POWER REDUCED message ? Is the check engine light on ?
Reduced Engine Power Mode
Throttle Actuator Control (TAC) System
electronic throttle control .
When the ECM detects a condition with the TAC system the ECM may enter a reduced engine power mode. Reduced engine power may cause one or more of the following conditions:
?€¢
Limited torque


?€¢
Limited range of throttle movement


?€¢
Engine OFF


Your going to need to take this to a ASE certified repair shop or the dealer , you probably don't have the diagnostic tools to trouble shoot this problem.
https://youtu.be/oPPLAHSSluw

Aug 16, 2015 | Cadillac Cars & Trucks

1 Answer

GMC P2135 throttle sensor code


Trouble Code: P2135

Throttle Position (TP) Sensor 1-2 Correlation

Possible Causes:


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 condition within the TAC system, more than one TAC system related DTC may set. This is due to the many redundant tests run continuously on this system. Locating and repairing one individual condition may correct more than one DTC. Disconnecting components during testing may set additional DTCs. Remember this if you review the stored information in Capture Info.If this DTC is determined to be intermittent, refer to Testing for Intermittent Conditions and Poor Connections .This is what's listed for this code.

Dec 24, 2012 | 2007 GMC Yukon Denali

1 Answer

Engine won't start and shows trouble code P1516 and reduced engine power light is on


Here is the definition of the code.

Possible causes - Faulty Throttle Actuator Control (TAC) module
- Throttle Actuator Control (TAC) module harness is open or shorted
- Throttle Actuator Control (TAC) module circuit poor electrical connection (loose or broken wires)

P1516 CHEVROLET Description The Throttle Actuator Control (TAC) module contains data which is essential for proper TAC operation. The TAC module continuously test the integrity of this data. 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.
Read more: http://engine-codes.com/p1516_chevrolet.html#ixzz286Gl3cSo

Sep 28, 2012 | 2002 Chevrolet TrailBlazer

2 Answers

Promblems P0340 P2105 P2106 P2110 P161B???? vehilce has limited power and slows down while driveing due to limited power vehicle has not ever shut off i believe it s the actuator on the throttle...


Diagnostic Test Code (DTC) P0340 is a Camshaft Position Sensor (CMP) fault. This can be caused by several things including faulty CMP sensor wiring, a defective CMP sensor, a shorted Voltage Reference (VREF) circuit or interference from high voltage ignition system problems.

The Camshaft Position (CMP) sensor is used to correlate crankshaft to camshaft position so that the Engine Control Module (ECM) can determine which cylinder is ready to be fueled by the injector. The CMP is also used to determine which cylinder is misfiring when a misfire is present.

Conditions for Setting the DTC

> CMP sensor pulse is not detected at the correct interval every 4 cylinders.
> Engine is running.


DTC P2105: Throttle Actuator Control (TAC) System - Forced Engine Shutdown
Conditions for Setting the DTC

> Ignition ON.
> The ECM detects the system is in Forced Engine Shutdown Mode.

DTC P2106: Throttle Actuator Control (TAC) System Performance - Throttle Limitation Active
Conditions for Setting the DTC

> Ignition ON.
> The ECM detects the system is in Limit Performance Mode

DTC P2110: Throttle Actuator Control (TAC) System - Forced Limited Engine Speed
Conditions for Setting the DTC

> Ignition ON.
> The ECM detects the system is in Power Management Mode.

PLEASE NOTE that these codes DO NOT NECESSARILY mean that you have a defective TAC. They DO NOT NECESSARILY mean that your TAC is malfunctioning. (although they COULD mean these things) These codes are mostly for informational purposes to let you know that the throttle system is being overridden by the engine control computer. The REASON that this override has taken place must be DIAGNOSED.

DTC P161B: Control Module Torque Performance:
The actual explaination for this one is pretty long and drawn-out. But to put things in simple terms, the trouble shooting charts pretty much say to inspect the engine for hardware problems that could allow excessive air flow. If there are no such problems found, replace the ECM.

WITH ALL OF THAT BEING SAID:

There is a Technical Service Bulletin (TSB) that addresses ALL of the codes listed above and involves replacement of the Manifold Absolute Pressure (MAP) sensor to fix the vehicle.

Here is a brief description of the bulletin:

FORENZA
Section Title: Engine
TSB No. TS 18 02228

Division: Automotive
Category: Technical

SUBJECT:
ENGINE HAS NO POWER, HESITATES, STUMBLES ON ACCELERATION, CHECK ENGINE LIGHT IS ON WITH MULTIPLE DTCS WITH P161B (CONTROL MODULE TORQUE PERFORMANCE) AS THE PRIMARY DTC

See table below for possible accompanying DTCs.


dttech_186.gif

Sep 02, 2011 | 2007 Suzuki Forenza Sedan

1 Answer

Tachometer barely goes over 1000 rpm when i rev it up . at idle the car appears dead on the the tach


Sounds like your tack need calabrated, Sorry this is different on most tac's if possable try to get the model # and call your parts store and ask how you calabrate that certin tac, Good luck.

Mar 31, 2011 | 1994 Toyota Paseo

1 Answer

When my 1987 Jeep Wrangler is cold, and at an idle the tac stops working , and the ammeter shows a negitive charge, and then the belt squeals. Once it warms up it seems to correct it self for the most...


You need to have the alternator checked. The tachometer runs off signal from the distributor, but can be indirectly affected by the charging system. It may be as simple as tightening the alternator belt, but I would guess that the alternator itself is going bad. Alternators that are marginal in charging ability anyway (old) may just go bad under the load of charging a fully dead battery.

Mar 24, 2011 | 1987 Jeep Wrangler

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