Question about 2008 Chevrolet Impala

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No tach signal 2008 impala

I donot have a short I have a open 5v referanc on cercit b the only sensors I did not test is on the trany thanks for any help

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  • Chevrolet Master
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I told you before check 5 volt ref. if you can't , take it to a qualified repair shop . You probably shouldn't be trying to fix it anyway ,unless at least a dealer tech .

Posted on Dec 05, 2016

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2008 impala no tach signal to pcm


DTC P0651: 5-Volt Reference 2 Circuit
You have a bad sensor or a short on the five ref. circuit .
The 5-volt reference 2 buss provides 5 volts to the following sensors:
?€¢
The APP sensor 1

?€¢
The crankshaft position (CKP) sensor

?€¢
The throttle position (TP) sensor 1 and 2

?€¢
The brake booster vacuum sensor

A bad sensor or short on the five volt ref. circuit will bring down the PCM and you will have a no start . I would pull the connectors off each of these sensors listed above to see if five volt ref. comes back to five volts . Well first check five volt ref at easiest sensor to get to . watch this video , he explains better !

2006 Cadillac DTS Shorted 5v Reference Circuit

Dec 05, 2016 | Cars & Trucks

1 Answer

1996 honda civic vtec. so in the morning on my way to work my engine light came on the speedometer went crazy and the transmission started sliping.. so I took it to 3 tranmission shops they all said...


Disconnecting any sensor will cause a non working car to work suddenly.I would check two things. 1. The Transmission control module- vary rare issue. 2. the ignition control module. These break down a lot in Honda's. In the 96-98 model of the civic, the dash uses the tach built into the ignition control module. the 99-00 model doesn't use the ICM tach signal, but uses the same module. Test your ICM with a digital multi meter ($5 @ harbor frieght), before dropping $60- 140 on one.

Apr 30, 2017 | 1996 Honda Civic

1 Answer

Sensor P0340 where does it go on 2005 chrysler sebring


Trouble Code: P0340

No Camshaft Position Sensor Circuit Failure

Possible Causes:


CMP Sensor connector is damaged, open or it is shortedCMP Sensor signal circuit is open or shorted to ground or to battery voltage or 5v supply circuitCMP Sensor 5v supply circuit is open or shorted to ground or to battery voltageCMP Sensor ground circuit is openCMP Sensor is damaged or has failedCKP Sensor is damaged or has failedPCM has failed.Here's a link to your sensor.

Mar 16, 2013 | 2005 Chrysler Sebring Conv

1 Answer

How to fix code p0452 on 2005 Explorer


Trouble Code: P0452

FTP Sensor Circuit Low Input

Possible Causes:


FTP sensor signal circuit is open or the ground circuit is open.FTP sensor signal circuit is shorted to VREF (5v).FTP sensor is damaged or the PCM has failed.Now you have to figure out what FTP is.Trouble Code: P0453

FTP Sensor Circuit High Input

Possible Causes:


FTP sensor signal circuit is open or the ground circuit is openFTP sensor signal circuit is shorted to VREF (5v)FTP sensor is damaged or the PCM has failed.Here's a link.

Jan 01, 2013 | Ford Explorer Cars & Trucks

1 Answer

What does the code p1143


Hello there!

P1143 Pressure Sensor Circuit Low Input Possible Causes

* Pressure sensor vacuum line damaged, loose or disconnected * Pressure sensor signal circuit is open or shorted to ground * Pressure sensor reference (5v) circuit is open or shorted to ground * Pressure sensor has failed

Tests/Procedures:

Check for a 5 volt reference on the reference wire Check the voltage on the signal signal wire. 4.0-4.2V KOEO (key on engine off), 2.0-2.3V with manifold vacuum applied. And be sure it has a good ground key on engine off and running.

Source: Subaru master mechanic (Brian)

Oct 29, 2012 | 1997 Subaru Legacy

1 Answer

Please Help 2004 dodge neon have spark engine cranks new camshaft sensor and coil does not pop w/ starting fluid code 340on reader



Trouble Code: P0340

No Camshaft Position Sensor Circuit Failure
Possible Causes:


CMP Sensor connector is damaged, open or it is shorted CMP Sensor signal circuit is open or shorted to ground or to battery voltage or 5v supply circuit CMP Sensor 5v supply circuit is open or shorted to ground or to battery voltage CMP Sensor ground circuit is open CMP Sensor is damaged or has failed CKP Sensor is damaged or has failed PCM has failed

Jun 08, 2012 | 2004 Dodge Neon

1 Answer

How do you fix a PO113 & PO123 code on a 02 Jeep Grand Charokee Larado 4.0



Trouble Code: P0113

IAT Sensor Circuit High Input
Possible Causes:


IAT Sensor signal circuit shorted to VREF (5v) IAT Sensor signal circuit is open, or the ground circuit is open


Trouble Code: P0123

TP Sensor/APPS Circuit High Input
Possible Causes:


Related TP Sensor engine DTCs present Intermittent wiring or connector problem TP signal circuit is open or is shorted to battery voltage or to 5v supply circuit TP sensor has failed TP sensor ground circuit is open PCM has failed IAT Sensor is damaged or it has failed (an internal open circuit) PCM has failed

Jun 02, 2012 | 2002 Jeep Grand Cherokee

1 Answer

Mapsenor


Hi there:Test the MAP Sensor output voltage at the MAP Sensor connector terminal B (as marked on the sensor body). This is done with the ignition switch ON and the engine OFF. Output voltage should be 4-5 volts.

The voltage should drop to 1.5-2.1 volts with a hot, neutral idle speed condition.

Test engine controller (terminal 5) for the same voltage as described above to verify the wire harness condition. Repair as necessary.

Test MAP Sensor supply voltage at sensor connector (terminal C) with the ignition ON. The voltage should be approximately 5V (+/- 0.5V). 5V (+/- 0.5V) should also be at terminal 6 of the engine controller wire harness connector.

Test the MAP Sensor ground circuit at the sensor connector (terminal A) and the engine controller connector (terminal 4).

Test the MAP Sensor ground circuit at the engine controller connector between terminal 4 and terminal 11 with an ohmmeter. If the ohmmeter indicates an open circuit, inspect for a defective sensor ground connection. This connection is located on the right side of the cylinder block, at the oil dipstick tube mounting stud. If the ground connection is good, replace the engine controller. If terminal 4 has a short circuit to 12V, correct this condition before replacing the engine controller.

Also could check this video...



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May 07, 2012 | 1998 GMC Jimmy

2 Answers

I have a jeep grand cherokee i have a code p1296. voltage missing at throttle position sensor.explanation engine running and the ecm detected map sensor voltage less than expected. probable cause open or...


I would change the TPS throttle position sensor and the Map/MAF are you sure its not the mass air flow?. I think your computer is fine it could be have a loose ground issues but computers dont go bad.

Sep 12, 2011 | 1997 Jeep Grand Cherokee

1 Answer

Po705 2001 mustang auto


CODE PO705 IS DTR SENSOR TR SENSOR CIRCUIT MALFUNCTION. POSSIBLE CAUSES, DTR OR TR SENSOR CONNECTOR IS DAMAGED OR SHORTED, DTR OR TR SENSOR SIGNAL CIRCUIT IS OPEN OR SHORTED TO GROUND, DTR OR TR SENSOR SIGNAL CIRCUIT IS SHORTED TO VREF 5V, DTR OR TR SENSOR DAMAGED, PCM HAS FAILED.

Jun 24, 2011 | 2001 Ford Mustang

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