Mercury

Ask a Mercury Question, Get an Answer ASAP!

how do i repair trouble code P0453 Evaporative Emission Control

Answered by:APenland
Ford Senior Master Technician, ASE
Positive Feedback: 98.5 %
Accepted Answers: 270

in Mercury

Recent Feedback

Positive

well done

Customer Question

how do i repair trouble code P0453 Evaporative Emission Control System Pressure Sensor High input on my 1999 mercury grand marquis

Submitted: 1464 days and 20 hours ago.

Category: Mercury

Value: $30

Status: CLOSED

Expert: APenland replied 1464 days and 20 hours ago.

HelloCustomer

Do you have access to a scan tool that can monitor PID DATA? The pinpoint test is a bit long.

P0453 - FTP Sensor Circuit High Voltage Detected

The PCM monitors the EVAP control system FTP sensor input signal to the PCM. The test fails when the signal average jumps above a minimum allowable calibrated parameter.

FTP circuit open
VREF shorted to VPWR
Damaged PCM
FTP circuit shorted to VREF or VPWR
SIG RTN circuit open
Damaged FTP sensor

FTP V PID reading greater than 4.50 volts with key ON and engine OFF or during any engine operating mode indicates a hard fault.

Customer replied 1464 days and 20 hours ago.

yes..i have one..but im not sure about it monitoring pid data...if it helps any- the car runs fine at a stand still but soon as i start driving and accelerate, the car bogs down as if i blew a ignition coil

Expert: APenland replied 1464 days and 20 hours ago.

Yes, here is the pinpoint test to follow.\

HX33 DTC P0453: CHECK FOR HIGH FTP SENSOR VOLTAGE

Note: FTP sensor input with no pressure/vacuum on the fuel tank (fuel filler cap open or not open to atmosphere) is 2.37 to 2.97 volts.

Connect scan tool.
Key on, engine off.
Access FTP V PID.
If FTP V PID is not present on the scan tool, measure voltage between FTP and SIG RTN circuits at the PCM harness connector with PCM connected.

Is measured voltage or FTP V PID reading greater than 4.50 volts?

Yes	No
KEY OFF. GO to HX34 .	The fault that produced DTC P0453 is intermittent. GO to Pinpoint Test Step Z1 .

HX34 CHECK FTP CIRCUIT FOR SHORT TO POWER

Disconnect FTP sensor.
Key on, engine off.
Measure voltage between FTP circuit at the FTP sensor harness connector and battery negative post.

Is the voltage greater than 10.5 volts?

Yes	No
KEY OFF. The FTP is indicating a short to VPWR. GO to HX35 .	KEY OFF. GO to HX36 .

HX35 CHECK FTP CIRCUIT FOR SHORT TO VPWR IN HARNESS

Note: Refer to the PCM connector pin numbers in the beginning of this pinpoint test.

Disconnect PCM.
Key on, engine off.
Measure the voltage between FTP circuit at the PCM harness connector and battery negative post.

Is voltage greater than 10.5 volts?

Yes	No
REPAIR short circuit.	REPLACE PCM. (Refer to Section 2 , Flash EEPROM.)

HX36 CHECK OPPOSITE INDUCED LOW FTP SIGNAL

Connect a jumper wire between SIG RTN and FTP circuits at the FTP sensor harness connector.
Key on, engine off.
If a scan tool communication concern exists, turn the key off, remove jumper immediately and go directly to HX41 .
Access FTP V PID.
If FTP V PID is not present on the scan tool, measure voltage between FTP and SIG RTN circuits at the PCM harness connector with PCM connected.

Is measured voltage or FTP V PID reading less than 0.10 volt?

Yes	No
REMOVE jumper. GO to HX37 .	Unable to induce opposite signal. KEY OFF. GO to HX39 .

HX37 CHECK FOR IN RANGE VOLTAGE BETWEEN VREF AND SIG RTN CIRCUITS AT FTP SENSOR

Key on, engine off.
Measure voltage between VREF and SIG RTN circuits at the FTP sensor vehicle harness connector.

Is voltage between 4.0 and 6.0 volts?

Yes	No
KEY OFF. GO to HX38 .	VREF voltage is out of range. GO to Pinpoint Test Step C1 .

HX38 CHECK FTP CIRCUIT FOR SHORT TO VREF IN SENSOR OR HARNESS

Note: Refer to the PCM connector pin numbers in the beginning of this pinpoint test.

Disconnect PCM.
Measure resistance between FTP and VREF circuits at the PCM harness connector. (For LS6/LS8 measure to both VREF pins.)

Is the resistance greater than 10,000 ohms?

Yes	No
REPLACE FTP sensor. REFER to Evaporative Emissions, Section 303-13 in the Workshop Manual for component removal and installation. RESTORE vehicle. FOLLOW the Vehicle Preparation for Monitor Repair Verification Drive Cycle and COMPLETE an Evaporative Emission Running Loss Monitor Repair Verification Drive Cycle (refer to Section 2 , Drive Cycles).	REPAIR short circuit.

HX39 CHECK FTP CIRCUIT FOR OPEN IN HARNESS

Note: Refer to the PCM connector pin numbers in the beginning of this pinpoint test.

Disconnect PCM.
Measure resistance of FTP circuit between PCM harness connector pin and FTP sensor harness connector.

Is resistance less than 5.0 ohms?

Yes	No
GO to HX40 .	REPAIR open circuit.

HX40 CHECK FOR OPEN SIG RTN CIRCUIT BETWEEN PCM AND FTP SENSOR

Measure resistance of SIG RTN circuit between PCM harness connector pin and FTP sensor harness connector.

Is resistance less than 5.0 ohms?

Yes	No
GO to HX41 .	REPAIR open circuit.

HX41 CHECK FTP CIRCUIT FOR SHORT TO VREF IN PCM

PCM disconnected.
Measure resistance between FTP and VREF circuits at the PCM harness connector. (For LS6/LS8 measure to both VREF pins.)

Is the resistance greater than 10,000?

Yes	No
REPLACE PCM (refer to Section 2 , Flash EEPROM).	REPAIR short circuit.

If you need anything more, just ask on this post.

Customer replied 1464 days and 20 hours ago.

is there any common sensors, connections..etc that can be defaulty

Accepted Answer

Expert: APenland replied 1464 days and 20 hours ago.

It may be just the sensor, but it helps to make sure. The sensor is on top of the tank and you will have to remove the tank. But your symptoms are pointing to more than just the sensor. You may have wiring problems. The pin point test will lead you to the right place of the problem.

Expert Type	Ford Senior Master Technician, ASE
Category:	Mercury
Pos. Feedback:	98.5 %
Accepts:	270
Answered:	4/2/2009

Experience: ASE Master Certified. ASE Gasoline/Diesel Engine Performance Certified,Ford Senior Master Technician

Ask this Expert a Question >

11 Mercury Mechanics are Online Right Now

Mercury Questions	Date Submitted
Mercury Cougar XR-7: Can someone please tell me the exact part	3/28/2013
Mercury Grand Marquis: I have an '03 Mercury Grand Marquis	3/27/2013
Mercury Milan Premier: 2007 mercury milan premium 6, Front	3/27/2013
Mercury: What is the correct spark plug gap for a Mercury Capri	3/27/2013
Mercury Monterey: 2004 MERCURY MONTEREY SHUTS OFF WHILE DIVING	3/26/2013
Mercury Mountaineer Premier: I have a 2006 Mercury Mountaineer	3/26/2013
1994 mercury villager heater blows cold air and also the temperature	3/25/2013
I have a 2002 Mercury Cougar. It won't start. It clicks as	3/24/2013
After an emission test failed, for knock sensor and oxygen	3/24/2013
Mercury: 1996 mercury	3/24/2013