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Chad Farhat
Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems
Category: Honda
Satisfied Customers: 1605
Experience:  Owner at Carolina Auto service & Sales , 20 years Experience in Foreign & Domestic vehicles
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My honda jazz rpm revs up and down when it is at park or

Customer Question

My honda jazz rpm revs up and down when it is at park or idil , the pickup speed also is not as powerful as before, what seems to be the problem
Submitted: 5 months ago.
Category: Honda
Expert:  Chad Farhat replied 5 months ago.

Hi my name is ***** ***** I will be assisting you

Expert:  Chad Farhat replied 5 months ago.

do you have a check engine light on or flashing ?

did you retrieve any faults codes ?

how many miles on it ?

let me know please

Thank You

Chad( aka-Customer

Customer: replied 5 months ago.
Hi there is no engine lights nor nothing flashing
im unable to retrieve any fault codes
it has over 93k miles on the car
Customer: replied 5 months ago.
I have tried changing the spark plugs , coil packs , engine oil , transmission oil . Nothing seems to work.
i have even cleaned the throttle body
Expert:  Chad Farhat replied 5 months ago.

was it not communicating with the module when u tried to retrieved or it read the module but no codes came out ?

and what scanner you used ?

Customer: replied 5 months ago.
i do not have a scanner to scan
Expert:  Chad Farhat replied 5 months ago.

ok i see no problem

one second , i will be right back

Expert:  Chad Farhat replied 5 months ago.

you need to check ignition coils

i send you a picture of where they are

Customer: replied 5 months ago.
this have been replaced recently
Expert:  Chad Farhat replied 5 months ago.

with out a scanner it will be tough , can you check fuel pressure

Customer: replied 5 months ago.
i will need to get a scanner
Expert:  Chad Farhat replied 5 months ago.

if you have new spark plug no coils ,spark is good , we need to have good fuel pressure ,?

Customer: replied 5 months ago.
the fuel pump was also replaced like 3 months back
Expert:  Chad Farhat replied 5 months ago.

if you get me codes i can help you with it , can u check pressure fuel now , do u have a fuel pressure tester

Expert:  Chad Farhat replied 5 months ago.

well if that is the case , we definitely need a scanner to get codes because we will be guessing , can you get a scanner and get me the codes ?

Expert:  Chad Farhat replied 5 months ago.

what does the car do , no power no acceleration , it backfires what does it do now ?

Customer: replied 5 months ago.
the only problem now is when it is idil or park , the car rpm keeps going up and down
Expert:  Chad Farhat replied 5 months ago.

ok good one second

Customer: replied 5 months ago.
when you drive off the car does not pick up fast enough , it takes some time before being able to go up to speed and sometimes the car vibrates.
Expert:  Chad Farhat replied 5 months ago.

Electronic Throttle Control System The throttle is electronically controlled by the electronic throttle control system. Refer to the system diagram to see a functional layout of the system. Idle control: When the engine is idling, the ECM/PCM controls the throttle actuator to maintain the proper idle speed according to engine loads. Acceleration control: When the accelerator pedal is pressed, the ECM/PCM opens the throttle valve depending on the accelerator pedal position (APP) sensor signal. Cruise control: The ECM/PCM controls the throttle actuator to maintain set speed when the cruise control is operating. The throttle actuator takes the place of the cruise control actuator.

the ETCS controls the idle thru the pcm ,

Expert:  Chad Farhat replied 5 months ago.

2

Expert:  Chad Farhat replied 5 months ago.

1

Expert:  Chad Farhat replied 5 months ago.

check both relays the one says ( PGM FI RELAY #1 and PGM FI RELAY # *****

i sent you the location

Customer: replied 5 months ago.
any specific things i need to look out for ?
Customer: replied 5 months ago.
i will get my workshop to check it out tomorrow and revert to you
Expert:  Chad Farhat replied 5 months ago.

ok great , i m online from 11 am till 12 pm tomorrow U.S time , let me know

I want you to check fuel pressure if possible

check the mass air flow sensor , take out the air filter and inspect ?

make sure all vacuum line are connected and not leaking

is it possible to check compression ,do u have a compression tester to check cylinder compression and compare

off course the code will be great

A Positive rating is Much Aprecciated

This Post Will Stay Open for you to Come Back And Ask Me Any Follow Up Questions You May have On This Issue Even after You Rate Me

Thank You

Chad Farhat ( aka -Customer)
ASE Certified Technician

Expert:  Chad Farhat replied 5 months ago.

air intake temp sensor ( that is the mass air flow sensor)

check also for power and ground to the connectors there

Thank You ***** ( aka -Customer)

ASE Certified Tech

Expert:  Chad Farhat replied 5 months ago.

and also Idle air control motor in picture ,for power & ground

1- IAT SENSOR

2- IAC MOTOR