Map sensor testing - 1998 Toyota Camry

Test the map and tps. If the throttle is controlled electronically, also test the accelerator position sensor. Make sure the tps signal changes smoothly as the throttle is opened.

Manifold Absolute Pressure (MAP) Sensor
OPERATION The Manifold Absolute Pressure (MAP) sensor is a device which monitors manifold vacuum. It is either mounted on the firewall or throttle body and is linked electrically to the on-board computer. The MAP transmits information on manifold vacuum conditions to the computer. This data determines engine load and is used with data from other sensors to adjust the air/fuel mixture.
On the 2.5L engine, the MAP sensor is mounted in the right rear side of the engine compartment. It is connected to the throttle body by vacuum line. The MAP sensor on V6 and V8 engines is mounted to the throttle body. It is connected by an L-shaped rubber fitting. The V10 MAP sensor is found on the right side of the intake manifold and senses vacuum in the manifold.
TESTING See Figure 1
To completely test this sensor and its circuitry, you will need a DRBII scan tool, or equivalent. This is a test of the MAP sensor only. This test is for all engines except the 4-cylinder.
On the V6 and V8 engines: inspect the rubber fitting from the MAP sensor to the throttle body. Repair if necessary.On the V6 and V8 engines: test the MAP sensor output voltage at the connector between terminals A and B (see drawing). With the ignition ONand the engine OFF , the output voltage should be 4-5 volts.Test the engine controller terminal No. 1 for the same voltage to confirm that the wiring is in good shape. Repair if necessary.Test the MAP sensor voltage at the sensor connector between terminals A and C with the ignition ON . The voltage should be 4.5-5.5 volts. Also check terminal No. 6 of the engine controller wiring harness for the same voltage. Repair or replace the wiring as necessary.Test the engine controller pin-1 for the same voltage to verify the wire harness condition.
Fig. 1: Terminal connections for testing the MAP sensor


Throttle Position Sensor (TPS)
The Throttle Position Sensor (TPS) is located on the throttle body and tells the computer when the engine is at idle, off-idle, or at Wide-Open Throttle (WOT). At idle, the computer cancels the spark advance. Idle speed is computer-controlled through the automatic idle speed motor.
TESTING To completely test this sensor and circuitry, you need the DRBII scan tool, or equivalent. This is a test of the sensor only. This test applies only to V6, V8 and V10 engines.
This test requires a digital voltmeter. The sensor must be checked on the vehicle with its 3-wire connector engaged to the sensor. The center terminal wire of the sensor connector is the output terminal.
Remove the air cleaner housing.Attach the positive lead of the voltmeter to the center terminal of the sensor harness.Attach the negative lead of the voltmeter to a good ground.With the ignition key in the ON position and engine not running, check the sensor output voltage at the center terminal wire of the connector. Check this at idle (throttle plate closed) and at Wide Open Throttle (WOT). At idle, the sensor output voltage should be greater than 200 millivolts. At WOT, the sensor output voltage should be less than 4.8 volts. The output voltage should increase gradually as the throttle plate is slowly opened from idle to WOT.If the sensor does not meet specifications, replace it.

Fig. 1: Common TPS mounting-V6 and V8 engines




Fig. Fig. 2: Common TPS mounting-V10 engine

Oldsmobile Alero MAP Sensor - PartsGeek.com

www.partsgeek.com > ... > Oldsmobile MAP Sensor > Alero Parts

Oct 29, 2008 - 04 2004 Oldsmobile Alero GL MAP Sensor 3.4L V6 VIN: E Delphi · Click to Enlarge ... Vehicle, Engine. • 2002 (02) Oldsmobile Alero, 3.4L V6. 04 2004 Oldsmobile Alero MAP Sensor 2.2L 4 Cyl Standard Motor Products.

Part 1 -How to Test the MAP Sensor (GM 2.4L Quad 4)

troubleshootmyvehicle.com > GM > 2.4L

Jun 7, 2011 - GM 2.4L MAP Sensor Test with a Multimeter. ... 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002. Malibu 2.4L. 1997, 1998 ... Alero 2.4L. 1999 .

Manifold Absolute Pressure Sensor

• OPERATION
• TESTING
• REMOVAL & INSTALLATION

Print

OPERATION

See Figures 1, 2 and 3

Fig. Fig. 1: MAP sensor location-2.4L engine

Fig. Fig. 2: MAP sensor location-3.0L engine

Fig. Fig. 3: MAP sensor location-3.3L and 3.8L engines
The PCM supplies 5 volts of direct current to the Manifold Absolute Pressure (MAP) sensor. The MAP sensor then converts the intake manifold pressure into voltage. The PCM monitors the MAP sensor output voltage. As vacuum increases, the MAP sensor voltage decreases proportionately. Also, as vacuum decreases, the MAP sensor voltage increases proportionally.
With the ignition key ON , before the engine is started, the PCM determines atmospheric air pressure from the MAP sensor voltage. While the engine operates, the PCM figures out intake manifold pressure from the MAP sensor voltage. Based on the MAP sensor voltage and inputs from other sensors, the PCM adjusts spark advance and the air/fuel ratio. The MAP sensor is mounted to the intake manifold, near the throttle body inlet to the manifold. The sensor connects electrically to the PCM.

TESTING

See Figures 4, 5, 6 and 7

Fig. Fig. 4: Disengage the MAP sensor connector-3.0L engine shown

WARNING When testing the MAP sensor, make sure the harness wires do not become damaged by the test meter probes.

1. Visually check the connector, making sure it is attached properly and that all of the terminals are straight, tight and free of corrosion.

Fig. Fig. 5: MAP sensor connector terminal identifications: (A) 5-volt supply, (B) sensor signal, (C) ground-3.0L engine shown

Fig. Fig. 6: MAP sensor connector terminal identifications-2.4L, 3.3L and 3.8L engines

Fig. Fig. 7: Using a digital volt-ohmmeter, test the MAP sensor voltage-3.0L engine shown

1. Test the MAP sensor output voltage at the sensor connector between terminals B and C (2.4L, 3.3L and 3.8L engines), or A nd B (3.0L engine).
2. With the ignition switch ON and the engine not running, the output voltage should be 4-5 volts. The voltage should fall to 1.5-2.1 volts with a hot, neutral idle speed condition. If OK, go to the next step. If not OK, go to Step 5.
3. Test the PCM terminal 36 for the same voltage described in the previous step to make sure the wire harness is OK. Repair as necessary.
4. Test the MAP sensor ground circuit at the sensor connector terminal A (2.4L, 3.3L and 3.8L engines) or C (3.0L engine) and PCM terminal 43. If OK, go to the next step. If not OK, repair as necessary.
5. Test the MAP sensor supply voltage between the sensor connector terminals A and B (2.4L, 3.3L and 3.8L engines) r A and C (3.0L engine) with the ignition key in the ON position. The voltage should be about 4.5-5.5 volts.
6. There should also be 4.5-5.5 volts at terminal 61 of the PCM. If OK, replace the MAP sensor.
7. If not, repair or replace the wire harness as required.

REMOVAL & INSTALLATION

See Figures 1, 2, 3 and 4
The MAP sensor is mounted on the intake manifold near the throttle body inlet to the manifold.

1. Disconnect the negative battery cable.
2. On the 3.0L engine only, disconnect the vacuum hose from the MAP sensor.
3. Detach the electrical connector from the MAP sensor.
4. Unfasten the mounting screws, then remove the MAP sensor from the vehicle.

To install:

1. Install the sensor onto the intake manifold and tighten the mounting screws to 35 inch lbs. (4 Nm).
2. Attach the sensor electrical connector.
3. On the 3.0L engine, connect the vacuum hose to the MAP sensor.
4. Connect the negative battery cable.

Hi, please use a voltmeter set to VDC to check the inputs and outputs of the MAP sensor as indicated below. Please get back to me with questions or results of your test.

Testing

1. Visually check the connector, making sure it is attached properly and that all of the terminals are straight, tight and free of corrosion. Reinstall the connector and probe the back of the connector where the wires go in to check the output as follows.
2. Test the MAP sensor output voltage at the sensor connector between terminals B and C (2.4L, 3.3L and 3.8L engines), or A and B (3.0L engine).
3. With the ignition switch ON and the engine not running, the output voltage should be 4-5 volts. The voltage should fall to 1.5-2.1 volts with a hot, neutral idle speed condition. If OK, go to the next step. If not OK, go to Step 5.
4. Test the PCM terminal 36 for the same voltage described in the previous step to make sure the wire harness is OK. Repair as necessary.
5. Test the MAP sensor ground circuit at the sensor connector terminal A (2.4L, 3.3L and 3.8L engines) or C (3.0L engine) and PCM terminal 43. If OK, go to the next step. If not OK, repair as necessary.
6. Test the MAP sensor supply voltage between the sensor connector terminals A and B (2.4L, 3.3L and 3.8L engines), or A and C (3.0L engine) with the ignition key in the ON position. The voltage should be about 4.5-5.5 volts.
7. There should also be 4.5-5.5 volts at terminal 61 of the PCM. If OK, replace the MAP sensor.
8. If not, repair or replace the wire harness as required.

Trouble Code: P1297

No Change In MAP Signal From Start To Run Transition
Possible Causes:


Engine vacuum port to MAP Sensor clogged, dirty or restricted MAP Sensor signal is skewed or the Sensor is out-of-calibration MAP Sensor VREF circuit open or grounded (intermittent fault) PCM has failed

Hi, there are 3 different engines for the 2005 Cobalt. I have pasted instructions from Autozone.com for all 3 below. I recommend you run the test also pasted below before buying a new sensor. If your sensor passes the test, please get back to me with your symptoms and/or trouble code for alternate repair advice. Please let me know if you have any questions, and thanks for using FixYa.
Removal & Installation2.0L Engine
Supercharger Inlet Pressure (Scip) Sensor

Fig. Manifold Absolute Pressure (MAP) SCIP sensor location-2.0L engine

1. Disconnect the Supercharger Inlet Pressure (SCIP) sensor harness connector.
2. Remove the SCIP sensor (1) from the supercharger.
   WARNING: If the SCIP sensor seal is damaged, the SCIP sensor must be replaced.
   
3. Inspect the seal for damage.

To install:
NOTE: Use the new SCIP sensor seal provided with the new SCIP sensor.

1. Install the SCIP sensor (1) into the intake manifold. Tighten the bolt to 89 inch lbs. (10 Nm).
2. Connect the SCIP sensor harness connector.

Temperature Manifold Absolute Pressure (Tmap) Sensor

Fig. Manifold Absolute Pressure (MAP) TMAP sensor location-2.0L engine

1. Disconnect the Temperature Manifold Absolute Pressure (TMAP) sensor harness connector.
2. Remove the TMAP sensor from the intake manifold.
   WARNING: If the TMAP sensor seal is damaged, the TMAP sensor must be replaced.
3. Inspect the seal for damage.

To install:
NOTE: Use the new TMAP sensor seal provided with the new TMAP sensor.

1. Install the TMAP sensor into the intake manifold. Tighten the bolt to 89 inch lbs. (10 Nm).
2. Connect the TMAP sensor harness connector.

2.2L & 2.4L Engines

Fig. Manifold Absolute Pressure (MAP) sensor location-2.2L & 2.4L engines

1. Remove the throttle body.
2. Disconnect the engine harness electrical connector from the Manifold Absolute Pressure (MAP) sensor.
3. Remove the MAP sensor and seal.

To install:

1. Lubricate the NEW MAP sensor seal with clean engine oil.
2. Install the MAP sensor into the intake manifold.
3. Connect the engine harness electrical connector to the MAP sensor.
4. Install the throttle body.

Testing

1. Verify the integrity of the entire air induction system by inspecting for the following conditions:
   Any damage to, or hairline fractures of, the MAP sensor housing, Loose or improper installation, Any vacuum leak
2. Verify that restrictions do not exist in the MAP sensor port or vacuum source.
3. Determine the current vehicle testing altitude. Ignition ON, observe the scan tool BARO Sensor parameter.
4. Use the scan tool and compare the MAP Sensor parameter to a known good vehicle, under various operating conditions.

Circuit Testing

Fig. Manifold Absolute Pressure (MAP) connector end view-2.0L & 2.2L engines

Fig. Manifold Absolute Pressure (MAP) connector end view-2.4L engine

NOTE All electrical components and accessories must be turned OFF, and allowed to power down.

1. With the ignition OFF, disconnect the MAP harness connector at the MAP sensor.
2. Test for less than 5 ohms of resistance between the low reference circuit terminal 2 and ground-2.0L & 2.2L (A and ground-2.4L).
   1. If greater than the specified range, test the low reference circuit for an open/high resistance.
   2. If the circuit tests normal, replace the ECM.
3. With the ignition ON, test for 4.8-5.2 volts between the 5 volt reference circuit terminal 1 and ground-2.0L & 2.2L (C and ground-2.4L).
   1. 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.
   2. 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.
4. Verify the scan tool MAP sensor parameter is less than 1 kPa.
   1. If greater than the specified range, test the signal circuit terminal 3-2.0L & 2.2L for a short to voltage.
   2. If the circuit tests normal, replace the ECM.
5. Install a 3A fused jumper wire between the signal circuit terminal 3-2.0L & 2.2L and the 5 volt reference circuit terminal 1-2.0L & 2.2L. Verify the scan tool MAP sensor parameter is greater than 126 kPa.
   1. If less than the specified range, test the signal circuit terminal 3-2.0L & 2.2L for a short to ground or an open/high resistance.
   2. If the circuit tests normal, replace the ECM.
6. If all circuits test normal, test or replace the MAP sensor.

Component Testing

NOTE You must perform the circuit/system testing, in order to verify the integrity of the MAP sensor circuits, before proceeding with the component testing.

1. Turn ON the ignition, with the engine OFF, and remove the MAP sensor.
2. Install a 3A fused jumper wire between the 5 volt reference circuit terminal 1-2.0L & 2.2L and the corresponding terminal of the MAP sensor.
3. Install a jumper wire between the low reference circuit terminal 2-2.0L & 2.2L of the MAP sensor and ground.
4. Install a jumper wire at terminal 3-2.0L & 2.2L of the MAP sensor.
5. Connect a DMM between the jumper wire from terminal 3 of the MAP sensor and ground.
6. Install the J 35555 to the MAP sensor vacuum port. Slowly apply vacuum to the sensor while observing the voltage on the DMM. The voltage should vary between 0-5.2 volts, without any spikes or dropouts.
7. If the voltage is not within the specified range or is erratic, replace the MAP sensor.

More likely the MAP sensor. A new sensor is $65, so I recommend you test it to see if it's bad. Test procedures are pasted below. Please let me know if it passes the tests or if you have any questions, and thanks for using FixYa.

OPERATIONThe PCM supplies 5 volts to the Manifold Absolute Pressure (MAP) sensor. The MAP sensor converts what it reads as the amount of intake manifold pressure into a return signal. The PCM monitors the MAP sensor output voltage. As vacuum increases in the intake manifold, the MAP sensor voltage decreases proportionately. Also, as vacuum decreases, the MAP sensor voltage increases proportionately.
During engine cranking, before the engine starts running, the PCM determines atmospheric air pressure from the MAP sensor voltage. While the engine operates, the PCM determines the intake manifold pressure from the MAP sensor voltage.
Based on MAP sensor voltage and inputs from other sensors, the PCM adjusts spark advance and the air/fuel mixture.
TESTING

Fig. Fig. 1: Manifold absolute pressure (MAP) sensor wiring schematic-1993-95 models

Fig. Fig. 2: Manifold absolute pressure (MAP) sensor connector terminal pin locations-1993-95 models


Before testing any electrical component, inspect the wiring and connectors for damage. Also wiggle the connectors to ensure a that they are firmly engaged. When testing the sensor, use a high input impedance digital volt-ohmmeter. Insert the tester leads through the back of the connector. Do not disconnect the electrical harness.

1. Inspect the vacuum hose connections at the sensor and throttle body. Repair or replace the hoses, if any hoses are cracking or vacuum is leaking.

For the following step, do not unplug the sensor connector-it must stay plugged in.

1. Make sure that the sensor wiring connector is fully inserted into the sensor (loose connections can create trouble codes). Check the MAP sensor output voltage by inserting the negative lead of a voltmeter into the back of terminal 2 and the positive test leads through the back of the harness connector terminal 3 (as marked on the sensor body). Refer to the accompanying wiring illustration. With the ignition switch in the ON position and the engine OFF , the output voltage should be 4-5 volts.
2. Start the engine and allow to idle at normal operating temperature. The output voltage should drop to 1.5-2.1 volts.
3. Test the PCM terminal 36 (1993-95 models), and terminal 1 (1996-97 models) for the same voltage described above to verify the wire harness condition. Repair the wiring harness if the voltage is not the same.
4. Test the MAP sensor supply voltage at the sensor connection terminal 2 and 1 with the ignition ON . The voltage should be 5 volts. Check the supply voltage at terminal 61 of the PCM. This should also be 5 volts.
5. Using an ohmmeter, test the MAP sensor ground circuit at the sensor connection terminal 1 and at the PCM terminal 43 (1993-95 models), terminal 4 (1996-97 models). Repair the wire harness for an open circuit if infinite resistance is detected.

REMOVAL & INSTALLATION

Fig. Fig. 6: On the 3.5L engine, the MAP sensor is threaded into the left side of the intake manifold plenum

The MAP sensor is located in the rear of the intake manifold plenum on the 3.3L engine. On the 3.5L engine, the MAP sensor is threaded into the left side of the intake manifold plenum.

1. Disconnect the negative battery cable.
2. Unplug the electrical connector from the sensor.
3. Remove the MAP sensor mounting screws.
4. Remove the sensor from the vehicle.

To install:

1. Install the MAP sensor into its position and secure in place with the mounting screws. Tighten the screws to 90 inch lbs. (10 Nm), then rotate it to a horizontal position.
2. Plug the electrical connector back into the sensor. Make certain that the connector is clean and snug fitting.
3. Connect the negative battery cable.

you will need to some testing to islate problem

Turn ON the ignition, with the engine OFF.
Disconnect the MAP sensor.
Connect a voltmeter between the MAP sensor 5-volt reference circuit and a good ground.
Measure for a proper range of 4.8-5.2 volts between the MAP sensor 5-volt reference circuit and a good ground.
If the voltage is less than the specified range, then test the circuit for a high resistance. If the is normal, replace the ECM. If the voltage is more than the specified range, then test the circuit for a short to voltage. If the circuit is normal, replace the ECM.With the MAP sensor still disconnected, use the scan tool to observe the MAP Sensor parameter for the proper value of less than 12 kPa.
If the MAP Sensor parameter is more than 12 kPa, then test the MAP sensor signal circuit for a short to voltage. If the circuit is normal, replace the ECM.Connect a jumper wire between the MAP sensor 5-volt reference circuit and the MAP sensor signal circuit.
Use the scan tool to observe the MAP Sensor parameter for the proper value of more than 103 kPa.
If the MAP Sensor parameter is less than 103 kPa, then test the MAP sensor signal circuit for a high resistance. If the circuit is normal, replace the ECM.Turn OFF the ignition, and all electrical accessories. Allow sufficient time for the control module to power down before taking a resistance measurement.
Measure for a proper value of less than 5 ohms of resistance between the low reference circuit of the MAP sensor and a good ground.
If the resistance is more than 5 ohms, then test the circuit for a high resistance. If the circuit tests normal, replace the ECM.If the MAP sensor circuits test normal, then replace the MAP sensor.

check your coolant temp sensor. possible map sensor.
The MAP sensor is fitted to the front of the throttle body except on 4.7L and 8.0L engines where it is installed on the intake manifold.

1. Remove the air cleaner assembly.
2. On throttle-body mounted MAP sensors, inspect the L-shaped tube from the throttle body to the MAP for cracks, blockage, and damage. Repair as necessary.
3. Unplug the MAP sensor connector.
4. Test the MAP sensor output voltage at the MAP sensor connector between terminals "sensor ground" and "sensor signal". With ignition ON and the engine OFF , the voltage should be between 4-5 volts.
5. Check voltage across the same terminals with the engine running at idle at operating temperature. Voltage should be 1.5-2.1 volts.
6. Test MAP sensor supply voltage at sensor connector between terminals "sensor ground" and "5v supply" with the ignition ON and engine off, voltage should be 4.5-5.0 volts.
7. Test the MAP sensor ground circuit at the "sensor ground" of the MAP connector, voltage should be less than 0.2 volts. If not inspect for open harness from pin 4 of PCM harness and terminal A . If no voltage is present, proceed to the next step.
8. Turn the ignition OFF .
9. Disconnect the PCM harness from the PCM.

WARNING Testing the wiring harness with the PCM still connected can cause serious damage to the processor. ALWAYS disconnect the PCM before testing the wiring harness, unless instructed otherwise.

1. Test the MAP sensor output voltage at the PCM connector. At the PCM cavity A-27 , the voltage should be about 5.0 volts.
2. Check the voltage at PCM cavity A-17 . It should be 5.0 volts.
3. If all of the above tests pass, plug in PCM wiring harness and MAP sensor connector.
4. With the ignition in the ON position, and the engine OFF , remove the tube from the throttle body to the MAP sensor.
5. Connect a vacuum pump to the nipple on the MAP sensor, and pump the sensor to 20-27 in. Hg. Check the sensor output voltage, it should be below 1.8 volts. If not, replace the MAP sensor. If the voltage is OK, proceed to next step.
6. Relieve vacuum pressure on the sensor, then check the output voltage. The voltage should be 4-5 volts; if not, replace the MAP sensor.
7. Install the air cleaner assembly.