Question about 1996 Honda Civic

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ECU not throw CEL when unplug MAP sensor

Unplug map sensor and the engine shut down but not pop the CEL. Any other sensor pop the CEL. New ECU, the old throw the CEL.

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  • 3,679 Answers

Might be as simple as a blown dash bulb

Posted on Mar 26, 2014

Testimonial: "Nope, As I said, with any other sensor unplugged the CEL pop on. Just the MAP not trigger it."

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Posted on Jan 02, 2017

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SOURCE: Map Sensor wiring

You may get some response if you kind of mention what vehicle it is?

Otherwise, just spring for Haynes or Chilton manual for under $20 US.

Posted on Jul 05, 2008

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SOURCE: 1993 civic idle low at stop

id reset your timing with a timing light and change plugs!! try changing plugs first!!

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SOURCE: 93 Civic DX Auto doesn't start after it rains/early in the mornin

could be your have air in the water line bleeder valve by thermostat. or thermostat. your prime problem could be the filter

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SOURCE: engine starts ,runs for 3secs then dies. if map

check main relay for hairline cracks on the soldering

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SOURCE: Honda Odyssey 1996, a problem:

Take it to Honda.

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Fuel mixture is wrong..not running correctly. however if i unplug the MAP sensor it runs perfectly fine. I know for a fact that any of 3 things could be wrong how do i determine which sensor is bad?

I fit runs good, gets decent gas mileage, and you don't have inspections. Unplug the MAP. It could be just the MAP sensor, could be the ECU. You might get a MAP sensor, good luck on getting an ECU.

Jun 28, 2016 | 1993 Toyota Tercel

1 Answer

Why is the engine running erratically?

the map sensor fail means (DTC code not stated sadly)
mean the voltage is stuck at 5v or 0v.
the ECU never lies about this, ever.
the ECU enters FAILSAFE mode , in this case. (limphome)
and runs rich has heck , horrid rich, misfires.
RPM limited
idle controls disabled.
and retarded spark timing.

pretty much worst of the worst for EFI ops.
all you need to do is post the DTC error. and all that is what matters.
new MAP time, or fix the vacuum hose. its clogged? cracked.
make sure the vacuum leaves the intake manifold (sucks) and
makes it all the way to the MAP on the fire wall and that the
tiny filter(check valve?) inline is clogged, (blown through it)

This is a G16A ENGINE, With an ECU that does not create or control spark, (old style distributor with mech, and vac, advance)

DTC 31 or 32??????????????????????

if vacuum line is breached to map , the vacuum is not 0" HG
the MAP outputs 3.9V

the ECU trip points i do not know. but
above 3.9 or below .5v it will trip... somewhere,

here is very good map , graph

all testing of it is here

with photos and how to back probe it with an volt meter.

Apr 29, 2015 | 1990 Geo Tracker

1 Answer

My Suzuki jimny stoped whiledriving

many suzuki have 2 baros, mine has 3.

one for altitude, inside ecu,

one for map TBI engine, (map sensor main 108 fails )

one for EGR map, to test EGR only. (my G16b has it)

we dont have 1.3 Jimny's here so can look it up for you.

but the FSM for your car (book) has this.

the P0108

is the main engine map sensor. (using usa fed rules for OBD2)

yours is EOBD rules. (im clueless with those)

that is used to calculate all air flow through the engine

it's output is stuck high,,

it's unplugged is my guess.

our map does 3.9V with the vacuum hose pulled. or just key on.

over 3.9v is illegal voltage and is bad map or unplugged.

when it goes to near 0v.volts at full vacuum 29"

this page may match your map for all voltages and states.

that is my best idea here , lacking non USA books,

Apr 15, 2015 | 2007 Suzuki Jimny 1.3

2 Answers

Why dose my truck turn off when I plug in my map Senior hose and when it unplug it idle high

That would mean its a bad map sensor ,when its unplugged it should throw a check engine which puts it in limp mode and ignores the sensor and then riches out the fuel mix to "protect"the motor which is why the rough idle.but is intended to get you home In a case where it goes bad map will fix it up

Feb 17, 2015 | Cars & Trucks

1 Answer

What does code PO108 mean on a 2001 Grand Cherokee

wow , you actually tried to look it up, a 1st time here.

the MAP is a baro sensor used to calculate fuel injection RATES.

if you have gross air leaks to the system the engine IDLE screams.

is it?

108 means the voltage is too high.

usually its unplugged, or bad sensor.

otential causes of a P0108 code: Bad MAP sensor Leak in vacuum supply line to MAP sensor Engine vacuum leak Short on signal wire to PCM Short on reference voltage wire from PCM Open in ground circuit to MAP Worn engine causing low vacuum

Bad MAP sensor Leak in vacuum supply line to MAP sensor Engine vacuum leak Short on signal wire to PCM Short on reference voltage wire from PCM Open in ground circuit to MAP Worn engine causing low vacuum

and last. but before ECU.

low engine compression, is 1 more, causes , many

what i do is reseat the MAP sensor

i then make sure he vacuum port is not clogged. (both sides)

i then measure the output , keyon, and idle and gunning throttle.

any Voltmeter works here,

key on is 5v or near.

idle 1.8v

gun engine as the RPMs fall like a rock the volts tries to hit 0.5vdc.

very very easy to find with a voltmeter

if the meter agrees with vacuum gage, then the MAP is ok

and you have air leaks or low vacuum for (VAST reasons)


Aug 19, 2014 | 2001 Jeep Grand Cherokee

1 Answer

2003 sonoma shuts down when MAP sensor is plugged in

Could be a bad one even if its new it happens

Feb 25, 2014 | 2003 GMC Sonoma

2 Answers

1990 jeep wrangler

which engine, 2.5L , 4L, or?

no scan tool for 93

is CEL lamp glowing running.

lots of things can cause rich, we do tests to find which, lots of tests.


BAD IAT , air temp sensor. reads too cold

oxy sensor would be first. not map, map would be last and can be tested easy the map. just a voltmeter test,

ECT sure, if way off.

water temp not 180F or more. holding, if low, ECT sees and and ECU

never leaves cold start. and sucks fuel for ever .

way too high fuel pressure.

EGR stuck open ,but that causes hot stalls.

bad spark for any reason, ever tune it up?

got black spark tips?

not reading the scan codes and CEL glowing, the ECU

could be in limphone mode. and will run rich and retarded spark.

use the jumper wire and read out the DTC codes. first.

using the diagnostic jumper , shown in the FSM.

Feb 07, 2014 | 1990 Jeep Wrangler

1 Answer

89 Chevy Sprint takes about 5 minutes to warm up to be able to drive away or it stalls when I give it gas. The engine will rev up for 3-4 seconds then drop down and almost stall and then rev again during...

Plug the vacuum line you unplugged and the idle should come back. Change your air filter and the map sensor. check for correct coolant level and replace the coolant temp. sensor. This sensor affects cold starting and idle through the ECU (open loop mode, rich fuel mapping and 1200 rpm idle) It should go to closed loop mode in the ECU once engine warm up is achieved ( lean fuel mapping and normal 900 rpm idle). Do not unplug anything else till you perform an OBDII scan of the stored fault history

Jun 14, 2017 | Chevrolet Sprint Cars & Trucks

1 Answer

2001 jimmy..engine starts and runs for 6sec then shuts off,starts again and shuts off I can rev engine but after 6sec it shuts off...I have changed coil and I am going to change knock sensor.what do you...

Huh??? Why change the Knock Sensor? The Knock Sensor is not going to cause your engine to shut down. Sounds like a Cam Sensor or MAP Sensor problem to me. Is the computer setting any codes?

Sometimes you can diagnose a messed-up MAP sensor by unplugging it and starting the engine. If the MAP is causing your problem, it will start and run. (It won't run very good, but it should idle OK)

If you have a 4.3L engine, I have seen Cam Sensors cause a start and stall condition. (part of the distributor assembly)

Dec 15, 2010 | GMC Jimmy Cars & Trucks

1 Answer

Map sensor bad and can't find one

A manifold absolute pressure sensor (MAP) is one of the sensors used in an internal combustion engine's electronic control system. Engines that use a MAP sensor are typically fuel injected. The manifold absolute pressure sensor provides instantaneous manifold pressure information to the engine's electronic control unit (ECU). This is necessary to calculate air density and determine the engine's air mass flow rate, which in turn is used to calculate the appropriate fuel flow. (See stoichiometry.)
An engine control system that uses manifold absolute pressure to calculate air mass uses the speed-density method. Engine speed (RPM) and air temperature are also necessary to complete the speed-density calculation. Not all fuel-injected engines use a MAP sensor to infer mass air flow; some use a MAF (mass air flow) sensor. Several makes use the MAP sensor in OBD II applications to test the EGR valve for functionality. Most notably General Motors uses this approach.

Find one HERE at eBay and have it in 2 days or so...

Jan 09, 2009 | 2003 Dodge Stratus

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