Intermittent Stalling — 2000 Honda CR-V

David Technician Saginaw, Michigan Posted   Latest   Edited  
Question
Driveability
2000 Honda CR-V SE 2.0L (B20Z2) 4-spd (MDMA)—JHLRD1879YC043137
No Dtc
Crank / No Start
Stall
No Spark

Hello all !

I have a 2000 Honda CRV, Intermittent stall. Let cool for 10 minutes and fires right up. Duplicated once and lost cycling of power from distributor assy on yel/ Grn wire from ECM. Verified ignition switch not at fault, Alternator charging. 

Anyone familiar with these? I just want a second opinion before I condemn ECM. 

Top traces are battery voltage at distributor and ignition switch. Yellow is backprobing circuit in question while cranking no start, no spark. 

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Edward Owner
San Antonio, Texas
Edward Default
 

David Check ICM CNTRL KOER Warm Engine at idle Frequency is about 25Hz. Frequency should increase as Rpm increase make sure to keep meter leads away form ign. Wires do a gradual rpm increase and decrease

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David Technician
Saginaw, Michigan
David Default
   

When the vehicle runs, that circuit toggles from 12V to 0 in a square wave patter, problem is when is stalls and will not start, there is no toggling of voltage on that circuit.

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Jim Owner/Technician
Charlotte, North Carolina
Jim Default
 

Check the PGMI main relay, pattern failure on high milage/ older hondas

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Agree
David Technician
Saginaw, Michigan
David Default
 

Will do thanks

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Edward Owner
San Antonio, Texas
Edward Default
 

David See if the Icm cntrl drops out at 2500 Rpm

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David Technician
Saginaw, Michigan
David Default
   

I only duplicated issue once and caught it. When It stalled and would not start, I had no ICM control , but there was over 6.5V at Distributor, does that lead me to ECM ? I can rev and hold at 2500 and ICM control is there. I am suspecting ECM and not a relay since all powers are there and the only thing I am missing is the ICM control?

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Edward Owner
San Antonio, Texas
Edward Default
 

David Before ruling the ecm i would bench test the ICM module at the zone they still have a bench tester I believe its a JA179 and make sure its test about three times so it heats up....

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David Technician
Saginaw, Michigan
David Default
 

Thanks, I am looking for an answer to this question: There is voltage on that circuit when concern present, ECM is supposed to pull to ground when cranking to signal ICM to fire correct? So in the capture, I have voltage and no toggle from ECM until it cools. Am I missing something else?

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Edward Owner
San Antonio, Texas
Edward Default
 

David Yes you correct PWM signal, But like Jim as state ECM are rare in these vehicles I would rule out the ICM module not sure if there some kind of voltage feed back in the icm module or the ECM is not PWM when it heats up.... but I would rule out the ICM module as these are prone to fail under heat.....

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David Technician
Saginaw, Michigan
David Default
 

Thank you

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Jim Owner/Technician
Charlotte, North Carolina
Jim Default
 

Ignition control modules are also prone to fail as you are describing- ECM failures are sorta rare on CR-V's, scope all the outputs from the distributor/ module to the ECM first,

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David Technician
Saginaw, Michigan
David Default
 

Thank you

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Edward Owner
San Antonio, Texas
Edward Default
 

David Take a look at this information.... talks about a input to the ECM for the ICM module...(crankshaft Sensor)

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Luis Technician
Lake Forest, California
Luis Default
 

Not likely to be and ecm problem. If it has aftermarket distributor most likely that's the issue, usually the igniter (ICM) and or the ignition coil is what fails 90% of the time. Used good quality oem or dealer parts aftermarket will have you run in circles again. and don't forget the famous main relay. for this age car after you find the problem I would recommend the others as preventive…

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Geoff Diagnostician
Lahaina, Hawaii
Geoff Default
 

I would want to see that TDC, CKP, and CYP (from the distributor) were ALL steady inputs to the ECM, when that ICM drops out.

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Edward Owner
San Antonio, Texas
Edward Default
 

Geoff I agree with your assessment

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David Technician
Saginaw, Michigan
David Default
 

Thank you

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Ray Diagnostician
North York, Ontario
Ray Default
 

The first GIF is CKP, TDC and CYP on start The second GIF is the ign input signal, with a frequency Math channel and TDC on start The third GIF CH A is ICM, CH C coil amps, CH D cmp The fourth is the CKP, TDC, CYP, PSD file on start

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Helpful
David Technician
Saginaw, Michigan
David Default
 

Thank you

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Edward Owner
San Antonio, Texas
Edward Default
 

Ray Nice 👌 but I have a quick question about the ICM Control circuit David had mention in his review the yellow trace in the scope shows a voltage signal.... And not a PWM signal curious on what kind of strategies is this representing....

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David Technician
Saginaw, Michigan
David Update
 

Customer declined further time for testing , thank you all for the information . I really wanted to get to the bottom of this, customer picked up vehicle . It will be back and I will update with findings.

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