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Ford Escape 2011 Fuel Delivery Diagram. Ran my scan tool and had P0455 and P0456 and found the Canister Purge Valve next to my Throtle Position Sensor was degraded by leaking vacuum. Replaced Sensor

Scan tool diagnostics not showing a failure code. Ran different parameter tests and all SAT. Yet have this degraded condition with fuel gauge moving around? I must be over looking something? Need a diagram of fuel system and wiring for fuel gauge.

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Jeremy W.

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Most likely the sending unit attached to the fuel pump module is the source of the erratic fuel gauge. The fuel pump is located in the fuel tank and can be accessed through a panel located under the drivers rear seat.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

Posted on Oct 09, 2016

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2004 gmc envoy with codes po140 and poo68 andpo136 replace map sensor and upper and lower oxygen sensor


So . what's your question ? Are you asking if you should replace those part's because of the code's or you did replace those parts an the check engine light is still on ? What engine does it have ? 4.2 l , 4.8 l , 5.3 l or 6.0l

P0068
Allow the engine to reach operating temperature.
Observe the MAP sensor voltage parameter with a scan tool.
Is the manifold absolute pressure (MAP) sensor voltage within the specified range?
0.8-4 V

Action
Values
Yes
No
Schematic Reference: Engine Controls Schematics
Connector End View Reference: Powertrain Control Module Connector End Views or Engine Controls Connector End Views
1
Did you perform the Diagnostic System Check-Engine Controls?
--
Go to Step 2
Go to Diagnostic System Check - Engine Controls
2
Are any other DTCs set?
--
Go to Diagnostic Trouble Code (DTC) List
Go to Step 3
3
Observe the Freeze Frame/Failure Records for this DTC.
Turn OFF the ignition.
Start the engine.
Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
Did the DTC fail this ignition?
--
Go to Step 4
Go to Diagnostic Aids
4
Inspect for the following conditions:
• Vacuum hoses for splits, kinks, and proper connections as shown on Vehicle Emission Control Information label--Inspect thoroughly for any type of leak or restriction.
• Air leaks at throttle body mounting area and intake manifold sealing surfaces
Did you find and correct the condition?


Did you check scan data for O2 sensor's ?

Start the engine.
Command the heated oxygen sensor (HO2S) 2 heater ON with a scan tool.
Wait 15 seconds to allow the HO2S 2 heater current to stabilize.
Observe the HO2S 2 heater current parameter with a scan tool.
Is the HO2S 2 heater current parameter within the specified range?
0.217-1.56 A

Sep 21, 2018 | GMC Cars & Trucks

1 Answer

After replacing the Park/Neutral Position Switch, the code P1520 still showing up. Other codes like P1554,P1689 and P1860 are showing up. 1999 Buick Lesabre. Could be the PCM?


DTC P1554 Cruise Control Feedback Circuit
DTC P1689 Traction Control Delivered Torque Output Circuit
DTC P1860 TCC PWM Solenoid Circuit Electrical
Your best bet , take it to a qualified repair shop that knows how to diagnose DTC'S - diagnostic trouble code's , not just assume the part is bad . Code's have diagnostic trouble tree ,flow chart , to test electrical circuit's , not just replace part's . Changing a PCM would mean programming (dealer ) . Do yourself a favor an take it there .
Diagnostic Aids
An intermittent may be caused by a poor connection, rubbed through wire insulation or a wire broken inside the insulation. Check for the following conditions:
• Misadjusted transaxle range switch.
Refer to Functional Test .
• Poor connection.
Inspect the PCM and PNP switch harness and connectors for improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection.
• Damaged harness.
Inspect the wiring harness for damage. If the harness appears to be OK, disconnect the transaxle range switch 7-way connector, turn ON the ignition switch and observe a voltmeter connected to the PNP circuit at the transaxle range switch 7-way harness connector while moving connectors and wiring harnesses related to the PNP switch. A change in voltage will indicate the location of the malfunction.
Reviewing the Fail Records vehicle mileage since the diagnostic test last failed may help determine how often the condition that caused the DTC to be set occurs. This may assist in diagnosing the condition.

Before replacing the PNP switch data on scan tool should have been done .
Put the vehicle in PARK.
Apply the parking brake.
Turn ON the ignition switch.
Observe Park/Neutral Position displayed on the scan tool.
Does the scan tool indicate that Park/Neutral is selected?

Put the vehicle in Neutral.
Observe Park/Neutral Position displayed on the scan tool.
Does the scan tool indicate that Park/Neutral is selected?
--
Go to Step 4
Go to Step 8
4
Observe Park/Neutral Position displayed on the scan tool while selecting D1, D2, D3, D4 and Reverse transaxle positions.
Does the scan tool indicate that park or neutral is selected in any of the above positions?

You have no clue as to what you are doing .

Jul 21, 2018 | Buick Cars & Trucks

1 Answer

2001 chevy tahoe code po440, po171


DTC P0171 or P0174
Circuit Description
The powertrain control module (PCM) controls the air/fuel metering system in order to provide the best possible combination of driveability, fuel economy, and emission control. Fuel delivery is controlled differently during open and closed loop. During open loop, the PCM determines fuel delivery based on sensor signals without oxygen sensor input. During closed loop, the oxygen sensor inputs are added and used by the PCM to calculate short and long term fuel trim fuel delivery adjustments. If the oxygen sensors indicate a lean condition, fuel trim values will be above 0 percent. If the oxygen sensors indicate a rich condition, fuel trim values will be below 0 percent. Short term fuel trim values change rapidly in response to the heated oxygen sensor (HO2S) voltage signals. Long term fuel trim makes coarse adjustments in order to maintain an air/fuel ratio of 14.7:1. If the PCM detects an excessively lean condition, this DTC will set.

Diagnostic Aids
• The system will go lean if an injector is not supplying enough fuel.
• A lean condition could be present during high fuel demand due to a fuel pump that does not pump enough fuel.
• Use a scan tool in order to review the Failure Records . If an intermittent condition is suspected, refer to Intermittent Conditions .
With every DTC a diagnostic flow chart is given for a diagnostic direction .(thing's to test ) For these test's you need a professional or factory scanner ! Plus knowledge of how these system's work would be nice .

Test Description
The numbers below refer to the step numbers on the diagnostic table.
If conditions were not corrected, refer to Fuel System Diagnosis for a possible fuel problem.
If conditions were not corrected, a worn cam, worn intake or exhaust valves, or other engine mechanical failure may be the problem.

Step
Action
Values
Yes
No
1
Did you perform the Diagnostic System Check-Engine Controls?
--
YES - Go to Step 2
NO - Go to Diagnostic System Check - Engine Controls
2
Important: If any DTCs other than P0171 or P0174 are set, refer to those DTCs before continuing
Install a scan tool.
Start and idle the engine at the normal operating temperature in closed loop.
Record the Long Term Fuel Trim.
Turn OFF the engine.
Turn ON the ignition, with the engine OFF.
Review the Freeze Frame/Failure Records and record the displayed data for this DTC.
Does the scan tool indicate that the Long Term Fuel Trim is greater than the specified value?
23%
YES - Go to Step 3
NO - Go to Diagnostic Aids
3
Operate the engine at idle.
Observe the HO2S parameter with a scan tool.
Does the scan tool indicate that the parameter is within the specified range and fluctuating?
200-800 mv
YES - Go to Step 4
NO - Go to Step 5


DTC P0440
The EVAP LARGE LEAK TEST is based on applying vacuum to the EVAP system and monitoring the rate of vacuum decay. The powertrain control module (PCM) uses the input from the fuel tank pressure (FTP) sensor in order to determine the rate of vacuum decay. At an appropriate time, the PCM turns the EVAP canister purge valve ON (open) and the EVAP canister vent valve ON (closed). This allows the engine to draw a vacuum on the system. At a calibrated time or vacuum level, the PCM turns the purge valve OFF (closed), and tests the system vacuum. If the system is unable to achieve the calibrated vacuum level, the PCM will set DTC P0440.
This could be caused by a leaking purge valve . Do you know what that is ? Mounted on the engine ,under the plastic engine cover . Disconnect the hose that goes to the vapor canister under the back of the vehicle . With the engine running see if you can feel vacuumn . If you do replace it .

Dec 15, 2017 | Chevrolet Tahoe Cars & Trucks

1 Answer

How to turn off unwanted dash lights and have gas gauge work on 2003 Saturn L200 ?


What unwanted dash light's ? Gas gauge sending unit in the fuel tank could be bad or the gauge it self could be bad . Installing a scan tool first off an checking for DTC'S - diagnostic trouble codes is the place to start . GM had bad step motors inside the instrument cluster . Year's 2003 to 2006 . Videos on youtube show how to replace. can buy at amazon.com .

Low Fuel
The low fuel telltale is turned ON by the cluster when it receives a command from the body control module (BCM) (L81) engine or the powertrain control module (PCM) (L61) engine. The cluster will turn the LED ON when the fuel level in the tank reaches approximately 1.5 gallons.
The low fuel telltale will be turned ON by the cluster for 2-3 seconds, when the ignition is turned to RUN, for a visual system check.

Fuel Gage
The input information for the fuel gauge is sent over the Class 2 serial data link by the body control module (BCM) on V6 (L81) engine appications. Information is sent by the PCM on the 4 cylinder (L61) engine applications to the BCM. The cluster will position the needle on the gauge based on the fuel level information sent by the BCM.

Install a scan tool.
Turn ON the ignition, with the engine OFF.
With a scan tool, observe the Fuel Level parameter in the Powertrain Fuel and Emissions list.
Does the scan tool indicate that the Fuel Level parameter is greater than the specified value?
If you do not have a professional scan tool your best bet , take your vehicle to a qualified repair shop .

Feb 19, 2017 | Saturn Cars & Trucks

2 Answers

Code 172 hhr


DTC P0172: Fuel Trim System Rich !
The engine control module (ECM) controls the air/fuel metering system in order to provide the best possible combination of driveability, fuel economy, and emission control. Fuel delivery is controlled differently during Open Loop and Closed Loop (CL). During Open Loop, the ECM determines fuel delivery based on sensor signals without heated oxygen sensor (HO2S) input. During CL, the ECM adds HO2S inputs and level of purge to calculate the short and long term fuel trim (FT) adjustments. If the HO2S indicates a lean condition, the fuel trim values will be above 0 percent. If the HO2S indicates a rich condition, the FT values will be below 0 percent. The short term FT values change rapidly in response to the HO2S voltage signals. The long term FT makes coarse adjustments in order to maintain an air/fuel ratio of 14.7:1. A block of cells contain information arranged in combinations of engine RPM and engine load for a full range of vehicle operating conditions. The long term FT diagnostic is based on an average of cells currently being used. The ECM selects the cells based on the engine speed and load. The FT diagnostic will conduct a test to determine if a rich failure actually exists or if excessive vapor from the evaporative emission (EVAP) canister is causing a rich condition.
If the ECM detects an excessively rich condition, DTC P0172 sets
Circuit/System Testing For DTC P0172
?€¢
Allow the engine to reach operating temperature. With the engine running, observe the Long Term FT parameter with a scan tool. The value should be more than approximately -20 percent with the engine running at operating temperature.


?€¢
If the value is not more than -20 percent, inspect for the following:


-
With the engine idling and the transmission in the Park or Neutral position, observe the manifold absolute pressure (MAP) sensor parameter. The MAP sensor parameter should be between 19-42 kPa.


?‡'
If the MAP sensor parameter is not between 19-42 kPa, refer to DTC P0106 .


-
With the engine idling, observe the mass air flow (MAF) sensor parameter. The MAF sensor parameter should be within 2-6 g/s at idle.


?‡'
If the MAF sensor parameter is not within 2-6 g/s at idle, refer to DTC P0101 or P1101 or DTC P0102 or P0103 .


-
Vacuum hoses for splits, kinks, and improper connections


-
The air intake duct for being collapsed or restricted


-
The air filter for being dirty or restricted


-
Objects blocking the throttle body


-
Excessive fuel in the crankcase due to leaking fuel injectors


-
The evaporative emissions control system for improper operation


-
Excessive fuel pressure


-
Malfunctioning fuel injectors


-
Fuel contamination


-
The HO2S for improper installation and for electrical wires or connectors that may have contacted the exhaust system


-
The HO2S signal circuit shorted to voltage

Oct 05, 2015 | Cars & Trucks

1 Answer

2006 HHR. What are the probable causes of a recurrent DTC P0172?


DTC P0172 Fuel Trim System Rich ,
possible bad O2 sensor , dirty Mass air flow sensor -depending on the engine size - 2.2 l or 2.4 l , MAP sensor , leaking fuel injectors ,leaking fuel pressure regulator ! You should take the vehicle to a ASE certified repair facility where they can do a good diagnostic check with a scan tool ! Check engine sensor data parameters etc.....

Step

Action

Values

Yes

No

1

Did you perform the Diagnostic System Check - Vehicle?
--
Go to Step 2
Go to Diagnostic System Check - Vehicle

2

Important: Disregard any transmission symptoms, antilock brake system (ABS) indicators, and traction control system (TCS) indicators until any fuel trim faults are repaired. A fuel trim fault may cause default actions such as harsh shifts and illumination of the ABS/TCS indicators.
Are any DTCs other than DTC P0172 also set?
--
Go to Diagnostic Trouble Code (DTC) List - Vehicle
Go to Step 3

3

  1. Install a scan tool.
  2. Review the Freeze Frame/Failure Records and record the displayed data for this DTC.
  3. Select Fuel Trim Data parameter.
  4. Start the engine.
  5. Observe the Long Term FT parameter with a scan tool.

Is the Long Term FT parameter less than the specified value?
-18%
Go to Step 4
Go to Diagnostic Aids

4

  1. Start the engine.
  2. Allow the engine to reach operating temperature.
  3. Put the transmission in PARK or NEUTRAL position.
  4. Turn off all of the accessories.
  5. Allow the engine to idle.
  6. Observe the Manifold Absolute Pressure (MAP) sensor parameter with a scan tool.
Is the MAP sensor parameter within the specified range?
19-42 kPa
Go to Step 5
Go to DTC P0106

5

  1. Operate the engine at idle.
  2. Observe the heated oxygen sensor (HO2S) parameters with a scan tool.
Does the scan tool indicate that the values are within the specified range and fluctuating?
20-900 mV
Go to Step 6
Go to Step 7

6

  1. Turn OFF the engine.
  2. Visually and physically inspect the following items:
?€¢
The vacuum hoses for splits, kinks, and proper connections--Refer to Emission Hose Routing Diagram .


?€¢
The air intake duct for being collapsed or restricted


?€¢
The air filter for being dirty or restricted


?€¢
For objects blocking the throttle body

Did you find and correct the condition?
--
Go to Step 9
Go to Step 8

7

  1. Turn OFF the engine.
  2. Inspect for the following conditions:
?€¢
The HO2S for proper installation


?€¢
Ensure that the electrical connectors and wires are secured and not contacting the exhaust system.


?€¢
The HO2S signal circuit for a short to voltage--Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?
--
Go to Step 9
Go to Fuel System Diagnosis

poss

Jul 21, 2015 | Chevrolet Cars & Trucks

1 Answer

How do I repl the vent solenoid on my 2007 trailblazer 6 cyl. I believe it is located on charcoal canister


Sorry you wasted your money on parts you didn't need ! There is a very specific diagnostic flow to testing this DTC - diagnostic trouble code ! An tools needed , scan tool , vacuum gauge ! the vent solenoid has nothing to do with this code .
Connector End View Reference: Powertrain Control Module Connector End Views or Engine Controls Connector End Views

1

Did you perform the Diagnostic System Check - Vehicle?
--
Go to Step 2
Go to Diagnostic System Check - Vehicle

2
  1. Disconnect the purge pipe from the evaporative emission (EVAP) canister purge solenoid valve.
  2. Install a hand held vacuum gage to the EVAP canister purge solenoid valve purge port.
  3. Disconnect the EVAP canister purge solenoid valve harness connector.
  4. Monitor vacuum on the vacuum gage.
  5. Start the engine and allow the engine to idle.
  6. Increase the idle to 1,200-1,500 RPM.
Does the vacuum gage indicate an increase in vacuum?
--
Go to Step 8
Go to Step 3

3

  1. Connect the EVAP canister purge solenoid valve harness connector.
  2. Monitor vacuum on the vacuum gage.
  3. Increase the idle to 1,200-1,500 RPM.
Does the vacuum gage indicate an increase in vacuum?
--
Go to Step 5
Go to Step 4

4
  1. Turn OFF the ignition.
  2. Remove and then install the fuel fill cap.
  3. Turn ON the ignition, with the engine OFF.
  4. Observe the Fuel Tank Pressure Sensor parameter with a scan tool.
Is the Fuel Tank Pressure Sensor parameter within the specified value?
-0.5 to +0.5 in H2O
Go to Diagnostic Aids
Go to Step 6

5

Test the control circuit of the EVAP canister purge solenoid valve for a short to ground. Refer to Testing for Short to Ground and Wiring Repairs.
Did you find and correct the conditions?
--
Go to Step 9
Go to Step 8

6

Test for an intermittent and for a poor connection at the fuel tank pressure (FTP) sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs.
Did you find and correct the condition?
--
Go to Step 9
Go to Step 7

7

Replace the FTP sensor. Refer to Fuel Tank Pressure Sensor Replacement .
Did you complete the replacement?
--
Go to Step 9
--

8

Replace the EVAP canister purge solenoid valve. Refer to Evaporative Emission Canister Purge Solenoid Valve Replacement .
Did you complete the replacement?
--
Go to Step 9
--

9

  1. Clear the DTCs with a scan tool.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
Did the DTC fail this ignition?
--
Go to Step 2
Go to Step 10

10

Observe the Capture Info with a scan tool.
Are there any DTCs that have not been diagnosed?
--
Go to Diagnostic Trouble Code (DTC) List - Vehicle
System OK

Feb 28, 2015 | 2007 Chevrolet Trailblazer

2 Answers

02 blazer LS zr2 gas gauge when i turn the key the needle goes all the way to full then when i start the car it bounces a little between 1/2 and full and when im in drive is slowly comes down but is not...


Fuel Gage
The IPC displays the fuel level as determined by the PCM. The IPC receives a class 2 message from the PCM indicating the fuel level percent. The fuel gage defaults to empty if:
• The PCM detects a malfunction in the fuel level sensor circuit.
• The IPC detects a loss of class 2 communications with the PCM.
When the fuel level is less than a pre-determined value, the low fuel indicator illuminates.

Hooking up a professional or factory scanner an checking input data to the PCM from the sending unit inside the fuel tank ,viewing the information sent to the IPC , Checking for diagnostic trouble code's .
DTC P0461
DTC P0462
Circuit Description
The fuel level sender changes resistance based on fuel level. The PCM monitors the signal circuit of the fuel level sender in order to determine fuel level. When the fuel tank is full, the sender resistance is high and the PCM senses a high signal voltage. When the fuel tank is empty, the sender resistance is low and the PCM senses a low signal voltage. The PCM uses the signal circuit of the fuel level sender in order to calculate the total remaining fuel percentage in the tank. The PCM sends the fuel level percent via the class 2 serial data circuit to the instrument cluster in order to control the fuel gage. The fuel level information is also used for misfire and EVAP diagnostics.

Install a scan tool.
Turn the ignition ON, with the engine OFF.
With a scan tool, observe the Fuel Tank Level Remaining parameter in the PCM data list.
Does the scan tool indicate that the Fuel Tank Level Remaining parameter is less than the specified value?
1%

No DTC'S - diagnostic trouble code's stored ,use this diagnostic procedure
Fuel Gage Inaccurate or Inoperative
• Refer to Fuel Level Specifications in order to verify the correct fuel level sensor readings. The Fuel Tank Level Remaining parameter is available in the scan tool in the PCM data list.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
This step tests for a high resistance in the signal circuit and the low reference circuit of the fuel level sensor.
DTCs will be set in the PCM when you perform this diagnostic table.
Step
Action
Value(s)
Yes
No
Schematic Reference: Instrument Cluster Schematics
1
Did you perform the Instrument Cluster Diagnostic System Check?
--
Go to Step 2
Go to Diagnostic System Check - Instrument Cluster
2
Disconnect C104.
Connect the J 33431-C Signal Generator and Instrument Panel Tester between the signal circuit of the fuel level sensor and the low reference circuit of the fuel level sensor on the male terminal side.
Turn the ignition ON, with the engine OFF.
Important: Verify the J 33431-C resistance settings with a DMM.
Vary the resistance on the J 33431-C from 40-250 ohms.
Refer to Fuel Level Specifications in order to convert from resistance to fuel gage display.
Does the fuel gage display the correct fuel level?

How to test fuel gauge tank sending unit P0463 GM

Dec 19, 2017 | Cars & Trucks

1 Answer

P1114 vw passat


DTC P1114Circuit Description

The engine coolant temperature (ECT) sensor is a variable resistor, that measures the temperature of the engine coolant. The powertrain control module (PCM) supplies 5 volts to the ECT signal circuit and a ground for the ECT low reference circuit. When the ECT is cold, the sensor resistance is high. When the ECT increases, the sensor resistance lowers. With high sensor resistance, the PCM detects a high voltage on the ECT signal circuit. With lower sensor resistance, the PCM detects a lower voltage on the ECT signal circuit. If the PCM detects an excessively low ECT signal voltage, which is a high temperature indication, DTC P1114 sets.
Conditions for Running the DTC

The engine run time is more than 5 seconds.
Conditions for Setting the DTC

The PCM detects an intermittent high ECT sensor temperature while the engine is running, and the run time exceeds 5 seconds.
Action Taken When the DTC Sets

Conditions for Clearing the DTCDiagnostic AidsTest Description

The number below refers to the step number on the diagnostic table.

  1. If there are no driveability complaints associated with this DTC, and if the DTC does not reset, the system is OK.
Step
Action
Yes
No
Schematic Reference:
Engine Controls Schematics
1
Did you perform the Diagnostic System Check-Engine Controls?
Go to Step 2
Go to Diagnostic System Check - Engine Controls
2
  1. Install a scan tool.
  2. Turn ON the ignition.
  3. Start the engine.
Does the scan tool indicate that DTC P0117 also failed?
Go to DTC P0117
Go to Step 3
3
  1. Turn ON the ignition, with the engine OFF.
  2. With a scan tool, observe the ECT sensor temperature while moving the sensor connector and the PCM connector.
Does the scan tool indicate an abrupt change in value?
Go to Step 6
Go to Step 4
4
  1. Turn ON the ignition, with the engine OFF.
  2. With a scan tool, observe the ECT sensor temperature while moving the wiring harness at the sensor and the PCM.
Does the scan tool indicate an abrupt change in value?
Go to Step 7
Go to Step 5
5
  1. Observe the Freeze Frame/Failure Records for this DTC.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC, or within the parameters observed in the Freeze Frame/Failure Records.
Does the DTC reset ?
Go to Diagnostic Aids
System OK
6
Repair the connector or terminal as necessary. Refer to Circuit Testing , and to Connector Repairs in Wiring Systems.
Did you complete the repair?
Go to Step 8
--
7
Repair the harness or wiring as necessary. Refer to Circuit Testing , and to Wiring Repairs in Wiring Systems.
Did you complete the repair?
Go to Step 8
--
8
  1. Use the scan tool in order to clear the DTCs.
  2. Turn OFF the ignition for 30 seconds.
  3. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
Does the DTC reset?
Go to Step 2
Go to Step 9
9
With a scan tool, observe the stored information, Capture Info.
Does the scan tool display any DTCs that you have not diagnosed?
Go to Diagnostic Trouble Code (D

Nov 04, 2012 | Cars & Trucks

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