Question about 2003 Saturn VUE

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We tested the ac pressure switch harness with a power point and the engine stopped running and won't re-start. did we cause this just by testing voltage?

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  • Michael Morgan Jul 19, 2010

    ok, we'll test that in the morning, tx.



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  • Saturn Master
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Hello! Describe a "power point"...Do you mean a test lamp? Give me a a little more information concerning won't start...

If the test was performed with a non-meter test probe the chance that damage occurred it very high...The particular harness that connects to the pressure sensor...Colors...Black...Gray...And Red/Black goes to the Engine Control Module (ECM...Computer)...Circuitry can only be tested using a high impedance digital meter...That doesn't mean the ECM is defective...Send a comment with more information...IE..Is the check engine light on indicating a trouble code?

I am here!...................Guru.............Saailer

I’m happy to help further over the phone at

Posted on Jul 18, 2010

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  • Michael Morgan Jul 18, 2010

    power point is a tester simular to a test light but has a digital screen for reading voltage. it can also be used to apply voltage or a ground but you have mannually apply either. I'm not sure if my tech applied volt or a ground. there are some codes in the ecm. We have a MATCO Determinator scan tool. code are p1640, p1635. then some u codes also.

  • Michael Morgan Jul 18, 2010

    We called saturn and they said just checking for volt shouldnt cause a problem. we reset the security system also. I also have ALLDATA on line as a resource.

  • David Burbee
    David Burbee Jul 19, 2010

    Hello! Thank you for your quick reply...The harness that was tested is 5 Volt circuitry...The following is a test procedure to localize the fault...

    You'll need a Digital Volt Meter...Most home improvement stores carry them...Cost is around $25-30...

    Disconnect the connector to the AC Pressure Switch...Set meter to 10 volt scale...Place + probe on the Gray wire...Place - probe to ground...Turn ignition key to on...Do not start...You must read no greater then 5.1 volts...If you do the ECM is defective and will have to be replaced...The ECM produces a 5 volt reference voltage which is supplied to two sensors...Ac pressure...and the Manifold Absolute Pressure..
    The P1635 is indicating that the reference voltage is to high to one/both sensors...

    Send a comment..................Saailer



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Chevy Blazer 4.3 160000miles Will The Oil Pressure Switch Cause A No Start Condition If It Fails And What Checks... can only cause a "no start" if the fuel pump feed is shorted out. All you have to do is unplug it to eliminate that possibility. All "crank, no start" conditions are approached in the same way. Every engine requires certain functions to be able to run. Some of these functions rely on specific components to work and some components are part of more than one function so it is important to see the whole picture to be able to conclude anything about what may have failed. Also, these functions can ONLY be tested during the failure. Any other time and they will simply test good because the problem isn't present at the moment. If you approach this in any other way, you are merely guessing and that only serves to replace unnecessary parts and wastes money. Every engine requires spark, fuel and compression to run. That's what we have to look for. These are the basics that need to be tested and will give us the info required to isolate a cause. 1) Test for spark at the plug end of the wire using a spark tester. If none found, check for power supply on the + terminal of the coil with the key on. 2) Test for injector pulse using a small bulb called a noid light. If none found, check for power supply at one side of the injector with the key on. 3) Use a fuel pressure gauge to test for correct fuel pressure, also noticing if the pressure holds when key is shut off. 4) If all of these things check good, then you would need to do a complete compression test. Once you have determined which of these functions has dropped out, you will know which system is having the problem.

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97 honda accord SE not getting power to fuel pump I drove my car over to my mothers house shut it off and went out to leave and my car would not start checked all the fuses and the relays then realized...

Three things you may want to check out next in your problem diagnosis:

1. You may actually be getting power to the fuel pump through the functioning fuel pump relay and the good fuse, but the fuel pump itself may have failed - you can check by disconnecting the fuel pump electrical connector, and checking for battery voltage when the ignition key is turned to "Start".

2. The ignition switch itself may have failed, since it has been recalled on this vehicle. The recalled defect may have caused a failure of the switch to deliver power to the fuel pump at startup. Here's a list of all the recalls for the 1997 Accord:

Recall - Ignition Switch Replacement 02-031 09/24/2002
Recall 02V120000: Ignition Switch Defect NHTSA02V120000 05/01/2002
Recall 99V069000: Lower Ball Joint Replacement NHTSA99V069000 04/20/1999
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Campaign - Front Balancer Shaft Oil Seal Replacement 00-073 03/13/2001
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3. Testing the PGM-FI main relay is fairly involved (and not detailed in the information below). You may want to re-post your query asking for the testing & diagnosis procedure for this component alone.

Below find the 1997 Honda Accord manual entry for diagnosis & testing of the fuel pump electrical circuit.


Fuel Pump Circuit

If you suspect a problem with the fuel pump, listen for the pump to operate by removing the fuel fill cap and checking to see if the pump can be heard running during the first two seconds after the ignition key is turned to the ON position. You should hear the fuel pump motor run.

If the fuel pump can be heard running, the fuel pump's electrical circuit is likely to be OK and the fuel pump operating pressure should be checked as outlined later in this section.

Once the engine has started, the fuel pump operation is controlled by the Powertrain Control Module (PCM) via the PGM-FI Main Relay. The fuel pump receives its electrical power from the PGM-FI Main Relay, which is triggered for two seconds when the ignition switch is initially turned to the on position.

After the initial two-second startup signal is received, the PGM-FI Main Relay is controlled by the PCM. Because the fuel pump receives its power from the PGM-FI Main Relay, a problem with the ignition switch, PCM, or electrical wiring may not allow battery voltage to reach the pump.

To check the fuel pump wiring proceed as follows:

1. Make sure the ignition switch is in the OFF position.
2. Locate and detach the fuel pump electrical connector at the fuel tank.
3. You may have to remove the floor access panel. For specific details, see the fuel pump removal procedure in this section.
4. Fuel pump access is limited on some 1996-97 models of the Accord and may require you to work under the vehicle. Perform the following steps if that is the situation:

a. Raise the vehicle and safely support it on suitable jackstands.
b. Remove the protective cover from the fuel tank fuel hoses.

5. Detach the fuel pump electrical connector.
6. Connect a suitable Voltmeter between the fuel pump positive terminal of the electrical connector and a known good chassis ground.
7. Hold the electrical connector of the PGM-FI Main Relay so the wire side of the female terminals is visible and install a jumper wire between terminal Nos. 4 and 5.
8. When the ignition switch is turned ON , battery voltage should be present at the fuel pump electrical connector.
9. If the battery voltage is present, check the fuel pump's ground.
10. If the ground is "OK", check the fuel pump.
11. If battery voltage is not present, trace the wiring harness and check the cause for an open or shorted circuit.
12. If all wiring checks out, test the fuel pressure, as outlined later in this section.

Fuel Pump Pressure

The fuel pressure should be checked at the fuel rail or at the fuel feed line for the fuel rail. The fuel pressure is checked with the engine started, thus the fuel pressure gauge must not interrupt the flow of fuel to the fuel rail and the fuel injectors.

To attach a fuel pressure gauge to the pressurized fuel loop requires the use of an adapter that is capable of safely withstanding the fuel system fuel pressure.

Checking the fuel system fuel pressure requires the use of an in-line fuel pressure gauge with the engine running. Do not perform this check if suitable test equipment and fuel fittings are not available. The fuel system operates under pressure, if any fuel leakage is noticed while performing this check STOP immediately and do not continue until the source of the leak is resolved. Do not perform this test near sources of heat, spark, or flames. This test must be performed in a well-ventilated area.

The fuel injection system remains under pressure, even after the engine has been turned OFF . The fuel system pressure MUST BE relieved before disconnecting any fuel lines. Failure to do so may result in fire and/or personal injury.

To check the fuel system pressure proceed as follows:

1. Remove the fuel filler cap and relieve the residual fuel pressure. For specific details, refer to the relieving fuel pressure coverage in this section.
2. Attach a suitable fuel pressure gauge to the fuel injection fuel loop as follows:

Models such as the 1998-00 Accord have a fuel pulsation dampener which must be removed in place of the banjo bolt for testing.

1996-97 Accord with 4-cylinder engines and 1996-00 Prelude: Remove the service/banjo bolt from the end of the fuel rail. Install the fuel pressure gauge using a suitable fitting to temporarily substitute for the banjo bolt or in place of the service bolt that will allow fuel to be supplied to the gauge and the fuel rail.

1996-97 Accord with V6 engines: Remove the banjo bolt from the fuel filter outlet and install the pressure gauge using a suitable fitting to temporarily substitute for the banjo bolt and supply fuel to the gauge and the fuel rail.

1998-00 Accord: Remove the fuel pulsation damper from the end of the fuel rail and install a suitable fuel pressure gauge in its place.

3. Remove and plug the vacuum line for the fuel pressure regulator located near the end of the fuel rail.
4. Start the engine and note the fuel pressure. With the pressure regulator vacuum hose disconnected and plugged, the fuel pressure should register as follows:

2.2L engines: 38-46 psi (260-310 kPa)

2.3L engines: 47-54 psi (320-370 kPa)

2.7L engines: 40-47 psi (270-320 kPa)

3.0L engines: 41-48 psi (280-330 kPa)

If the engine won't start, turn on the ignition switch ON, wait two seconds, then turn off the ignition switch OFF. Turn the ignition switch back ON again and read the fuel pressure.

5. If the fuel pressure is higher than specification check for a pinched or restricted fuel return hose or line.

6. If the fuel pressure is lower than the specification check for a damaged fuel pressure regulator, clogged fuel filter, fuel feed line or a leak in the fuel feed line. If the fuel pressure regulator, fuel feed lines, and fuel pump are OK, replace the fuel pump and fuel filter.

The fuel pressure regulator testing procedures are located later in this section.

Once the test is complete, perform the following:

7. Carefully remove the fuel pressure gauge and test fittings.
8. Install the removed fasteners using new sealing washers.
9. Install the fuel filler cap.
10. Start the engine and check for any fuel leaks, and repair as necessary.

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1 Answer

I have a 2000 f250 5.4 it will turn over but not start.i have power coming from battery checked senors 5 an 7 are the ones that ive found to be the promblem i have only 18 pounds of fuel pressure fuel pump...

i got new pcm to ???? Was it programmed ? Dealer ! checked senors 5 an 7 are the ones that ive found to be the promblem ?????????? What are sensors 5 & 7 ? 2000 PCED On Board Diagnostics II SECTION 5: Pinpoint Tests Procedure revision date: 01/07/2003 A: No Start A: Introduction A1 CHECK PASSIVE ANTI-THEFT SYSTEM (SECURILOCK)
    Note: This vehicle may have an anti-theft system, which may be activated, causing the no start condition. Verify by viewing anti-theft indicator light on instrument panel or a Diagnostic Trouble Code (DTC P1260) may be present.
  • Verify anti-theft system.
Is the system activated?
Yes No REFER to Electrical Anti-Theft, Section 419-01 in the Workshop Manual for diagnosis and testing. GO to A2 . A2 ATTEMPT TO CRANK ENGINE
    NOTE: Verify inertia fuel shutoff (IFS) switch is set (button pushed in). Refer to Owner Guide for location. Does engine crank?
    Yes No GO to A3 . REFER to the Starting Systems, Section 303-06 in the Workshop Manual. A3 IDENTIFY TYPE OF NO START
      NOTE: The purpose of this Test Step is to identify intermittent No Starts in order to guide the technician to the proper repair procedure. Does the vehicle start now?
      Yes No Vehicle is an intermittent No Start. GO to Z2 . Natural gas vehicles:

      KEY OFF. GO to HA47 .

      All others:

      • Disconnect TP sensor.
      • Key on, engine off.
      • Measure voltage between VREF and SIG RTN circuit at the TP sensor harness connector. GO to Pinpoint Test DH to refer to the schematic.
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      • Key on, engine off.
      • Measure voltage between Pin 13 at the data link connector and battery negative post.
      • (Refer to the Wiring Diagrams for connector location.)
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      Yes No REPAIR short to power. For coil-on-plug vehicles:

      KEY OFF. GO to A17 .

      All others:

        Note: The scan tool must be connected to a reliable power source that is powered with the key in the START position (such as directly to the vehicle battery). Also verify that the vehicle battery is fully charged.
      • Access PIP PID.
      • While viewing the PIP PID, crank engine.
      Is the PIP PID switching on and off?
      Yes No KEY OFF.

      For 2L engines : GO to JD1 .

      For all others : GO to JB1 .

      If OK: Natural Gas Vehicles : GO to A9 .

      If returning from another pinpoint test or all others:

      • Release the fuel pressure.
      • Install fuel pressure tester.
      • Scan Tool connected.
      • Key on, engine off.
      • Enter Output Test Mode (refer to Section 2 ) and run the fuel pump to obtain maximum fuel pressure.
      Is fuel pressure at the specified pressure (use the fuel pressure chart in Pinpoint Test HC)?
      • GO to Pinpoint Test HC and observe WARNING, CAUTION AND HANDLING.
      • Fuel pressure tester installed.
      • Scan Tool connected.
      • Key on, engine off.
      • Access Output Test Mode and run fuel pump to obtain maximum fuel pressure.
      • Exit Output Test Mode.
      • Verify fuel pressure remains within 34 kPa (5 psi) of the maximum pressure for 1 minute after turning pump off.
      Does fuel pressure remain within 34 kPa (5 psi)?
        Note: Check at least two fuel injectors, one on each bank. A no start condition can exist only if greater than 50% of the fuel injectors are without VPWR.
      • Disconnect any two fuel injectors.
      • Key on.
      • Measure VPWR circuit voltage at fuel injector harness connector.
      Is voltage greater than 10.5 volts?
      Yes No Natural Gas Vehicles:

      GO to A15 .

      • Connect fuel pressure gauge to Schrader valve.
      • Cycle key several times.
      • Locate and disconnect the inertia fuel shutoff (IFS) switch.
      • Monitor pressure gauge while cranking the engine for at least five seconds.
      Is there a pressure drop greater than 34 kPa (5 psi) while cranking the engine?
      Yes No The electronic engine control system is not the cause of the no start. RETURN to Section 3 , Symptom Chart for further diagnosis. REPLACE PCM (refer to Section 2, Flash Electrically Erasable Programmable Read Only Memory (EEPROM) ). A15 CHECK FUEL PRESSURE ON NATURAL GAS VEHICLES
      • Connect scan tool to DLC.
      • Access FRP PID (fuel pressure).
      • Record fuel pressure.
      • Connect fuel pressure gauge to Schrader valve.
      • Key on, engine off.
      • Record fuel pressure.
      Is fuel pressure between 552 and 827 kPa (80 and 120 psi) on the Scan Tool and fuel pressure gauge?
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      • Connect test lamp between the injector signal circuit and VPWR circuit pin at the injector harness.
      • Crank engine.
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      • Connect incandescent test lamp between B+ and each coil driver circuit at the harness connector.
      • Crank engine.
      Does lamp blink consistently and brightly (one blink per engine revolution)?
      Yes No KEY OFF. GO to A7 . KEY OFF. GO to JD1 .

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