Question about 1998 Volvo V70

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1987 Volvo 245 automatic gets only 15mpg - runs well otherwise

Does anyone have the resistance figures for the various pins at the plug of the older lh2.2 map sensors ? I'vechecked O2 sensor voltage (ok) and the ect' resistance is spec. map sensor is next
thanx one and all.


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Did you check all the basics first? Your air filter or catalytic converter could be plugged, your brakes could be dragging, or incorrect ignition timing, dirty fuel injectors, insufficient tire pressure, poor wheel alignment, or you may even have a fuel leak that you are not aware of. Hope this helps.

Posted on Mar 04, 2009


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Got a p0725 code on my 01 dodge durango

Intermittent condition Restricted fuel supply line Fuel pump inlet strainer plugged Fuel pump module O2 sensor heater operation O2 sensor EVAP system operation O2 sensor signal circuit shorted to voltage O2 sensor signal circuit open TPS voltage greater than 0.92 volts with throttle closed Throttle position sensor sweep MAP sensor operation ECT sensor operation Engine mechanical problem Fuel filter/pressure regulator (high)


Jan 28, 2013 | Dodge Durango Cars & Trucks

1 Answer

Map sensor

Manifold Absolute Pressure Sensor



See Figures 1, 2 and 3

0900c1528003c4d9.jpg enlarge_icon.gifenlarge_tooltip.gif

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

0900c1528003c4da.jpg enlarge_icon.gifenlarge_tooltip.gif

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

0900c1528003c4db.jpg enlarge_icon.gifenlarge_tooltip.gif

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.


See Figures 4, 5, 6 and 7

0900c1528003c4dc.jpg enlarge_icon.gifenlarge_tooltip.gif

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.

0900c1528003c4dd.jpg enlarge_icon.gifenlarge_tooltip.gif

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

0900c1528003c4de.jpg enlarge_icon.gifenlarge_tooltip.gif

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

0900c1528003c4df.jpg enlarge_icon.gifenlarge_tooltip.gif

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.


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.

Jul 21, 2012 | 1997 Plymouth Voyager

1 Answer

I have 4 cyln 5 speed gmc .truck just started skipping or motor hesitation under acceleration,i changed plug, wires,pcv valve.old plugs r white on the heads.i know its lean.please help .has anyone had same...

I hear you!

Bad input = Bad output

Start testing the computer inputs -

1) Air Charge Sensor (Resistance measurement - OHM meter needed)

2) Coolant Temp Sensor (Resistance measurement - OHM meter needed)

3) Crankshaft Sensor (Test procedures off the ignition amplifier)

4) Detonation Knock Sensor (This can cause your symptoms if there are any rattles in the motor or exhaust pipe - like a loose heat shield or bracket causing the rattle will be picked up by the knock sensor - which in turn retards the timing causing a stumble and hesitation)

5) MAP (Manifold Absolute Pressure) Sensor (make sure the plug contacts to it AND all of your other inputs are not corroded - also check the vacuum line going to the MAP and make sure there are no leaks, cracks....)

6) O2 Sensor (Would normally show up on computer as needing replacement - not always though )

7) Throttle Position Sensor (this is a variable resistor, which can and does get wear spots on it - sending incorrect voltages to computer causing your stated symptoms too. A good analog meter would be nice to test this. engine off, key on - You can tap into the voltage side and watch the needle carefully while slowly opening throttle to wide - and back to close. If the needle on the meter moves smoothly from one side to the other without and dips or jerking motions, then the TPS is fine - of course the voltages need to be within parameters)

You can find all of the testing procedures and vehicle specific data at

Good Luck.

Oct 03, 2010 | 1994 GMC Sonoma

1 Answer

1994 jimmy 4.3 vortec has a stumble right off of idle when accelerating and a hesitation once and awhile at random spaads ussually under load any suggestions?

Do you have an O2 sensor code that would explain a random miss?
Does it happen cold or hot? Have you checked the spark from the coil?

Diagnosis Before beginning any diagnosis and testing procedures, visually inspect the components of the ignition system and engine control systems. Check for the following:
  • Discharged battery
  • Damaged or loose connections
  • Damaged electrical insulation
  • Poor coil and spark plug connections
  • Ignition module connections
  • Blown fuses
  • Damaged vacuum hoses
  • Damaged spark plugs
Check the spark plug wires and boots for signs of poor insulation that could cause crossfiring. Make sure the battery is fully charged and that all accessories are off during diagnosis and testing. Make sure the idle speed is within specification. If an open or ground in the Ignition Control (IC) circuit occurs during engine operation, then engine will continue to run, but using a back-up timing mode (controlled by the ICM) based on preset timing values. The Malfunction Indicator Lamp (MIL) or SERVICE ENGINE SOON light will not illuminate at the first appearance of a break in the circuit. However, if the IC fault is still present once the engine is restarted, a Code 42 will set on OBD 1 systems in the PCM and the MIL will illuminate. Poor performance and fuel economy may be noticed while the engine is running under back-up timing. When attempting to search for ignition troubles, keep in mind the various sensor inputs which the PCM uses to calculate timing may affect engine performance. The PCM will alter timing based on sensor inputs as follows:
  • Low MAP output voltage = More spark advance
  • Cold engine = More spark advance
  • High MAP output voltage = Less spark advance
  • Hot engine = Less spark advance
With this in mind, DETONATION could be caused by low MAP output or high resistance in the coolant sensor circuit. POOR PERFORMANCE could be caused by a high MAP output or low resistance in the coolant sensor circuit.

Jul 22, 2010 | 1994 GMC Jimmy

1 Answer

Po137/po157 codes no activity

P0137 / P0157-Oxygen O2 Sensor Circuit Low Voltage (Bank 1, Sensor 2) refers to the second oxygen sensor on Bank 1. P0137 means the O2 oxygen sensor's voltage remained low for longer than 2 minutes. This, is interpreted by the ECM as a low voltage condition and sets the MIL. Bank 1 Sensor 2 is located to the rear of the catalytic converter and should produce an output signal relative to oxygen storage capacity of the catalytic converter. This rear (sensor 2) sensor is less active than the signal produced by the front sensor. However, if the ECM senses the sensor is inactive, this code will set.

A code P0137 may mean that one or more of the following has happened:

Faulty o2 sensor Exhaust leak near the rear sensor
Plugged catalyst
Short to voltage on O2 signal circuit
High resistance or open on O2 signal circuit

Possible Solutions…
Replace faulty sensor
Repair exhaust leak near the rear sensor
Check for restriction in catalyst and replace as necessary
Repair short, open, or high resistance on o2 signal circuit

Mar 08, 2010 | 2000 Chevrolet Camaro

1 Answer

OBD code P0146 O2 sensor circuit no activity. Bank 1 Sensor 3 what should I check first.

ok first off if there is no connectivity you will need to confirm this by testing the leads to the O2 sensor itself, try to back probe them with a T pin so that you don't disturb the plug too much so that you can rule out a fuilty plug connection, make sure you have voltage, I would assume this is a 4 wire O2 sensor which means that its a heated sensor meaning it has a heater in it to jump start the collection of data @ the sensor.if you have voltage check the plug it self it there is voltage on the O2 sensor side on the plug then you have a bad O2 sensor

Feb 26, 2010 | 1999 Chevrolet Camaro

1 Answer

Have a 97 dodge 318 plugs flood as soo as you try

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.

Jan 22, 2010 | 1997 Dodge Ram 1500 Club Cab

1 Answer


Run this diagnostic
Test Procedures 
1. Check if DTC P0110 is set in addition to DTC P0105 or P0106. If DTC P0110 is set, go to next 
step. If DTC P0110 is not set, go to step 3 . 
2. Turn ignition off. Disconnect MAP sensor 4-pin connector. Measure resistance between ground 
and MAP sensor connector terminal No. 4 (Green wire). If resistance is one ohm or less, replace 
MAP sensor. If resistance is more than one ohm, repair open in Green wire between MAP sensor 
and ECM connector terminal No. 48. After repairs, clear DTC and verify MAP sensor operation. 
3. Turn ignition off. Disconnect MAP sensor 4-pin connector. Measure resistance between MAP 
sensor connector terminals No. 1 and 4 (component side). Resistance should be about 30,000 
ohms. If resistance is as specified, go to next step. If resistance is not as specified, replace MAP 
sensor. After repairs, clear DTC and verify MAP sensor operation. 
4. Turn ignition on. Measure voltage between ground and MAP sensor connector terminal No. 2 
(Red wire). Voltage should be about 5 volts. If voltage is as specified, go to next step. If voltage is 
not as specified, repair open in Red wire between ECM connector terminal no. 44 and MAP 
sensor connector terminal No. 2. After repairs, clear DTC and verify MAP sensor operation. 
5. Turn ignition off. Disconnect ECM 63-pin connector. Check for continuity between ground and 
MAP sensor connector terminal No. 1 (Green wire). If continuity does not exist, go to next step. If 
continuity exists, repair short to ground in Green wire between MAP sensor and ECM. After 
repairs, clear DTC and verify MAP sensor operation. 
6. Reconnect MAP sensor connector and ECM connector. Turn ignition on. Backprobe MAP sensor 
connector and measure voltage between ground and MAP sensor connector terminal No. 1 (Green 
wire). Voltage should be 0.2-4.5 volts. If voltage is as specified, go to next step. If voltage is not 
as specified, replace MAP sensor. After repairs, clear DTC and verify MAP sensor operation. 
7. Check ECM connector for loose or damaged terminals. If problem exists, repair ECM connector. 
If problem does not exist, replace MAP. Clear DTC and verify system operation. If problem still 
exists, replace ECM. After repairs, clear DTC and verify system operation.

Good luck and hope this helps. If the car does not start diconnect the MAP sensor to get you to the parts store if you need it to get you there.

May 25, 2009 | 2001 Hyundai Elantra

1 Answer

1998 mitsubishi diamante o2 sensor, o2 heater, EGR sys NOT READY

Check the O2 sensor heaters with an ohmmeter. Also test the EGR solenoid valve by applying 12 vdc directly to the solenoid pins.

Disconnect the HO2S.
  1. Measure the resistance between PWR and GND terminals of the sensor. Resistance should be approximately 6 ohms at 68°F (20°C). If resistance is not within specification, the sensor's heater element is faulty.
  2. With the HO2S connected and engine running, measure the voltage with a Digital Volt-Ohmmeter (DVOM) between terminals HO2S and SIG RTN(GND) of the oxygen sensor connector. Voltage should fluctuate between 0.01-1.0 volts. If voltage fluctuation is slow or voltage is not within specification, the sensor may be faulty.


Aug 21, 2017 | 1998 Mitsubishi Diamante

4 Answers

Service Engine soon light Code P0133

I just came from an Autozone, and then spoke with 2 Hyundai dealership service departments and they all three stated the P0113 code is the Intake Air Temperature sensor (IAT, also referred to as the Mass Air Pressure - MAP - sensor) on the engine, not an O2 sensor found in the exhaust system.

Dec 11, 2008 | 2001 Hyundai Elantra

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