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Faulty wires from low pressure sensor

Short in wires from low pressure sensor on a/c.when wires are wiggled at
harness going to the ecm,the clutch on the a/c will engage.also the ecm
is showing 2 codes on the oxygen sensors which were replaced but it would still not pass a smog test in california.there was also a blown fuse
on the oxygen sensors which i replaced but the service engine light still comes back on.this to me looks like it could be in need of a new wire
harness.what do you think?

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Try disconnecting battery & then remove connector @ ECM and clean all contacts at ECM & connector well with electrical cleaner. Check for loose ones & do as necessary (carefully) to tighten if needed. Add a little dielectric grease to connection before re-attaching & try that.

Posted on Jul 20, 2009

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Code on 2010 Enclave about the cooling fans running all the time while engine is on.Code is refrigerant pressure sensor cicuit low voltage. # is P0532-00.Does anybody know where sensor is located


DTC P0532: Air Conditioning A/C Refrigerant Pressure Sensor Circuit Low Voltage
The sensor gets 5 volt ref. voltage from the ECM - engine control module . Three wire sensor , all wires are to an from the ECM .

Circuit/System Description
The engine control module (ECM) monitors the high side refrigerant pressure through the A/C refrigerant pressure sensor. The ECM supplies a 5-volt reference and a low reference to the sensor. Changes in the A/C refrigerant pressure cause the A/C refrigerant pressure sensor signal to the ECM to vary. When the pressure is low, the signal voltage is low. When the pressure is high, the ECM commands the cooling fans on. When pressure is too high or too low, the ECM will not allow the A/C compressor clutch to engage.

Circuit/System Testing
Ignition OFF, disconnect the harness connector at the A/C refrigerant pressure sensor.
Ignition OFF, test for less than 10 ohms between the low reference circuit terminal 1 and ground.
? If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 2 and ground.
? If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
? If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
Verify the scan tool A/C High Side Pressure Sensor parameter is less than 0.1 volts (1 psi).
? If greater than the specified range, test the signal circuit terminal 3 for a short to voltage. If the circuit tests normal, replace the ECM.
Install a 3A fused jumper wire between the signal circuit terminal 3 and the 5-volt reference circuit terminal 2. Verify the scan tool A/C Refrigerant High Side Pressure Sensor parameter is greater than 4.90 volts (425 psi).
? If less than the specified range, test the signal circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
If all circuits test normal, test or replace the A/C refrigerant pressure sensor.

A/C Refrigerant Pressure Sensor
In the engine compartment, on the high pressure refrigerant line

Do you know difference between high an low side lines ?
between alternator an the compressor

Feb 07, 2018 | Cars & Trucks

1 Answer

Will not start p2045 p2197 p0190 p2247 p2245 p2248 p2249 p2518 comes up


code p2045 refers to reductant temperature sensor--high input==causes --wiring faulty sensor
code p2197 refers to heated oxygen sensor(HO2S)1 bank 2-- signal stuck lean===causes HO2S---fuel pressure---injectors---intake leak
also refers to oxygen sensor (O2s)1 bank 2 -signal stuck lean===causes--O2S--fuel pressure---injectors---intake leak
also refers to heated oxygen sensor (HO2S) 1 bank 2--implausible signal===causes wiring---short to ground--short to positive--HO2S---ECM
code po190 refers to fuel rail pressure (FRP) sensor-circuit malfunction===causes --wiring ---fuel rail pressure sensor---ECM
code p2247 refers to heated oxygen sensor (HO2s) 1 bank 1 reference voltage--open circuit===causes--wiring ---ho2s
also refers to o2s 1 bank 2 reference voltage ---open circuit===causes wiring---o2s
also refers to HO2S 1 bank 2 ---no signal===causes wiring--ho2s---ECM
code p2245 refers to HO2S 1 bank 1 --reference voltage --circuit low===causes--wiring short to ground--ho2s also refers to o2s 1 bank 1 circuit low===causes wiring short to ground--o2s
code p2248 refers to the ho2s I bank --performance problem===causes --wiring--ho2s
code p2249 has the same causes short to ground---ho2s and o2s
code p2518 refers to a/c refrigerant pressure sensor B ---circuit high===causes wiring short to positive--a/c refrigerant pressure sensor.
so after all that replace all the ho2s and o2s sensors using the correct tools so that the wiring is not damaged and check the wiring back to the ECM for burns and rub marks.

Dec 30, 2013 | Cars & Trucks

1 Answer

I just got my car scanned and a few codes pop up


Error Code: P0130
Fault:
Oxygen Sensor (O2S) 1, Bank 1 - Circuit Malfunction
Possible Cause:
Malfunction Indicator Lamp (MIL) Triggered on first occurrence.
-Wiring harness.
-Oxygen sensor (O2S).
-Engine control module (ECM).

Error Code: P0505
Fault:
Idle Speed Control (ISC) System - Malfunction
Possible Cause:
-Wiring harness.
-Idle speed control (ISC) actuator/Idle air control valve (IAC) valve.
-Throttle motor.
-Throttle valve tight/sticking.
-Engine control module (ECM).

Error Code: P0100
Fault Location:
-Mass Air Flow (MAF) Sensor/Volume Air Flow (VAF) Sensor - Circuit --Malfunction
Possible Cause:
-Wiring harness.
-Mass air flow (MAF) sensor.
-Volume air flow (VAF) sensor.
-Engine control module (ECM).

Error Code: P1491
Fault:
Exhaust Gas Recirculation (EGR) Valve Insufficient Lift
Possible Cause:
-Wiring harness.
-EGR Valve.
-ECM

Error Code:P1607
Fault:
-Engine Control Module (ECM)/Powertrain Control Module (PCM)

Error Code: P0966
Location:
-Pressure Control (PC) Solenoid B - Circuit Low
Possible Cause:
-Wiring short to earth.
-Pressure control (PC) solenoid.
-Engine control module (ECM)/Powertrain control module -(PCM)/Transmission control module (TCM) .


Apr 30, 2013 | 2004 Honda Civic

1 Answer

2005 Mercedes C240 has code P0452


P0452 - Evaporative Emission Control System Pressure Sensor Low Input

Possible causes- Evaporative Emission System (EVAP) Pressure sensor harness is open or shorted
- Evaporative Emission System (EVAP) Pressure sensor circuit poor electrical connection
- Faulty Evaporative Emission System (EVAP) Pressure sensor When is the code detected?An excessively low voltage from the sensor is sent to Engine Control Module (ECM).

Sep 10, 2012 | 2005 Mercedes-Benz C-Class

1 Answer

Could it be that the ecu is wrong


No it is not Catalytic Converter related. Your fuel tank pressure sensor must be disconnected or the wiring to it defective for the evaporative emission system.
P0453 HONDA - Fuel Tank Pressure Sensor High Voltagexicon.jpghttp://engine-codes.com/p0453_honda.htmlForum CodePossible causes- Fuel Tank Pressure sensor harness is open or shorted
- Fuel Tank Pressure sensor circuit poor electrical connection
- Fuel Tank Pressure Sensor
- Faulty Engine Control Module (ECM) When is the code detected?A high voltage signal from the fuel tank pressure sensor is sent to Engine Control Module (ECM).
P0450 - Evaporative Emission Control System Pressure Sensor Malfunctionxicon.jpghttp://engine-codes.com/p0450.htmlForum CodePossible causes- Evaporative Emission System (EVAP) Pressure sensor harness is open or shorted
- Evaporative Emission System (EVAP) Pressure sensor circuit poor electrical connection
- Faulty Evaporative Emission System (EVAP) Pressure Sensor
- Faulty Engine Control Module (ECM) When is the code detected?- An improper voltage signal from EVAP control system pressure sensor is sent to ECM.

Aug 10, 2012 | 1998 Honda Civic

1 Answer

2000 gmc 1500 p0300


I think the P0107 is the root cause of the problem.
P0300 is a random engine misfire on all cylinders.

Possible causes - Faulty spark plug (s)
- Faulty ignition coil (s)
- Ignition coils harness is open or shorted
- Ignition coils poor electrical connection
- Clogged or faulty fuel injectors
- Injectors harness is open or shorted
- Injectors poor electrical connection
- Improper spark plugs
- Insufficient cylinders compression
- Incorrect fuel pressure
- Intake air leak
P0107 Manifold Absolute Pressure/Barometric Pressure Circuit Low Input.
Possible causes - Manifold Absolute Pressure harness is open or shorted
- Manifold Absolute Pressure sensor poor electrical circuit connector
- Faulty Manifold Absolute Pressure sensor
- Faulty Powertrain Control Module (PCM) or Engine Control Module
(ECM)

Feb 02, 2012 | 2000 GMC New Sierra 1500

1 Answer

WE ARE HAVING PROBLEM FINDING DIAGNOSTIC PROCEDURE FOR CADILLAC DIVILLE WITH DTCs P0029,P0047,P0137 and P0107


P0029 - Exhaust Valve Control Solenoid Circuit Range/Performance Bank 2
Causes:
- Dirty engine oil
- Low engine oil level
- Exhaust valve control solenoid circuit open or shorted
- Exhaust valve control solenoid circuit poor electrical connection
- Faulty exhaust valve control solenoid

Solutions:
- Change oil
- Replace exhaust valve control solenoid

P0047 - Turbocharger/Supercharger Boost Control A Circuit Low
This vehicle is not equipped with a turbocharger or supercharger if it is a 1994.

P0137 - o2 Sensor Circuit Low Voltage Bank 1 Sensor 2
Causes:
- Sensor circuit harness or connectors is open or shorted
- Rear heated oxygen sensor Bank 1 may be faulty
- Fuel pressure may be faulty
- Fuel injector may be faulty
- Intake air leaks

Solution:
Replacing the O2 Sensor 2 usually takes care of the problem.

P0107 - Manifold Absolute Pressure/Barometric Pressure Circuit Low Input
Causes:
- Damage harness or connectors
- MAP sensor circuit is open or shorted
- MAP sensor
- Damaged PCM or ECM

Solutions:
- If damage, repair MAP sensor harness or connector
- Replace MAP sensor
- Replace PCM or ECM

Jan 25, 2011 | 1994 Cadillac DeVille

1 Answer

P0450 CODE ON 1997 T100 V6 PICKUP. WHAT IS it and how can I fix it?


Good day
P0450 is Evaporate emission system pressure sensor/switch
the cause could be
1. short or open in the vapor pressure sensor circuit
2.vapour pressure sensor
3. ECM

You can test with the following
you can access the ECM behind the glove box. turn ignition on,backprobe the ECM connector, on A/T models, measure voltage between terminals #1 (green/black wire) and #22 (brown/black wire) at the ECM E6 connector. on M/T models measure the voltage between terminals #1 (green/black wire) and #9 (brown/black wire) at ECM E6. if voltage is 4.5 - 5.5 volts, go to the next step. If the voltage is not 4.5 - 5.5 volts, replace ECM and retest.
2. back-probe ECM connector on A/T models measure voltage between terminals #15 (red/blue wire) and #22 (brown/black wire) at ECM E6. on M/T models measure voltage between terminals #4 (red/blue wire) at ECM E5 and connector #9 (brown/black wire) at ECM E6 connector. on all models disconnect the vacuum hose from the vapor pressure sensor. sensor is located near the brake master cylinder. connect a vacuum pump to sensor. if voltage is 2.9-3.7 volts without vacuum applied and 1.3-2.1 volts with .59 in.Hg (2kpa) vacuum applied. replace ECM and retest if voltage is not as specified go to next step.
3. check for open r short circuit in the wiring harness between vapor pressure sensor and ECM. repair wiring as necessary. if wiring harness is okay replace the vapor pressure sensor.

Hope this helps

Cheers

Jul 13, 2009 | 1997 Toyota T100

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vulcan bonaire comfort control External natural gas electronic ignition 2004. ISSUE: Fan blowing only cool air continuously. Forced to kill power to stop it. model is one of the following. MB514E,20E or 30E. Going by mech drawing parts list. i can confirm what type of sensors i have cleaned with very fine sandpaper. flame sensor PN 5441603SP and IGNITER ELECTRODE PN 5441602SP The fault code i see is described as the following. There are x4 LED's. Sequence Left to Right. LEGEND: 1 Flame Sensor 2 Pressure switch 3 OverTemp 4 Diag. R Red G Green S Solid Colour B Blinking LED Behaviour. In order 2RS & 4GS Until i hear ignition. 2RS & 3RB Duration: split second 2RB,3RS & 4GB Duration: split second 3RS & 4GB Duration: Until it has completed blinking x4 times. 3RS Duration 4 seconds Repeat last two mentioned behaviour. in my own opinion, as a safety feature, the unit thinks that it has overheated or is about to. so kills the gas and force feeding cool air to heating components to save it from frying. Does this mean i have fault 04 if so does this mean i may have a faulty igniter or flame sensor or maybe a faulty as described in the mech drawing SWITCH OVER TEMPERATURE 120 degrees celsius. Am i correct here? Is this the over temperature cut out switch? if no one can really pinpoint which part requires replacement, can you at least, in sequence advise which parts to purchase? so then ill just try my luck. i wonder how to properly test if flame sensor, igniter, over temp etc is faulty with a multimeter. do i just perform a continuity test. I wonder what other parts can i test related to this fault im getting.

Jul 22, 2018 | Vulcan Heating & Cooling

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