2008 Chevrolet Malibu Classic 3.5L

Joshua Service Manager Michigan Posted   Latest   Edited  
Resolved
Electrical
2008 Chevrolet Malibu Classic LT 3.5L (N LZ4) 4-spd (4T65-E) — 1G1ZT58N08F111256
P0102 — Mass or Volume Air Flow Sensor "A" Circuit Low
P0101 — Mass or Volume Air Flow Sensor "A" Circuit Range/Performance

2008 Chevrolet Malibu (Classic) 160k

Had the following codes

-P0102 - Mass Air Flow Circuit Signal Low -P0128 - Coolant Thermostat -P0446 - Evap Vent Control Problem -P0455 - Evap System Leak (Large) -P0496 - Evap System Flow During Non-Purge -P0523 - Engine Oil Pressure Sensor Circuit Signal High

Also the AC did not work

Replaced the following

-Thermostat -MAF -Oil Pressure Sensor -Valve,Evap Purge Solenoid -Solenoid,Evap Emission Canister -Oil Change

Replaced all the parts and still getting P0102 - Mass Air Flow Circuit Signal Low.

Pin A - 5 Volt reference Pin B - has 12 volts, Pin C - has ground Pin D - is a signal wire and that's 1.8 volts Pin E - I'm just getting straight ground from the PCM. I've tested the harness to the PCM to the MAF sensor and it's good for that circuit. When you disconnect the ECU PIN E loses ground.

The original ECU had no AC and 1 MAF Code for P0102 then replaced the ECU with a used one and programmed it to the car and now the AC does work and has 2 MAF Sensor codes P0102 (Mass Air Flow Circuit Signal Low) and P0101 (Mass or Volume Air Flow Sensor A Circuit Range/Performance). I figured maybe the used one I got was bad so I got another Used one and it's throwing the exact same codes. If I put the old one back in the AC doesn't work and then just throws only the P0102 code. When using the 2 used ECUS it runs roughly and can keep it running by 2 footing it. I'm a little lost on what to do next.

Does anyone have any ideas?

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Stephen Owner/Technician
California
Stephen
 

Are you loading the powers and grounds?

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Joshua Service Manager
Michigan
Joshua
 

Confused on what you're saying?

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Eric Owner/Technician
Wisconsin
Eric
 

Perform a load test on the power and ground circuits for the PCM is what he is asking you. I have had several of these types of vehicles that had a leaking electronic thermostat and the coolant wicked up into the wire harness. A couple came from other shops that had installed used PCMs a few times, they never noticed the corroded connector pins at the PCM. One was bad enough to have engine…

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Interesting
Don Owner/Technician
Ohio
Don
 

Are the replacement ECUS the same service number as the original ECU, and when programing them are you doing a replace and program or just a reprogram. Replace and program you need to correct the vin to get the correct calibration file, re -program will just use the vin in the used ecu and load the calibration file for that vin. Hope this helps Don

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Joshua Service Manager
Michigan
Joshua
 

Did a replace and program. Apparently there are many different vehicles that use the same ECU. The 1st Used ECU came from a 2008 Chevrolet Equinox and the 2nd Used ECU came from a 2008 Chevrolet Impala.

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Matthew Diagnostician
Kentucky
Matthew
 

It sounds like you have a wiring issue. I would throw a scope or graphing multimeter on the 5 volt reference and start wiggling wires. I have seen a ton of wiring issues on these.

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Agree
David Owner/Technician
Alberta
David
 

The connector on the wire harness side could be needing replacement ? Have you got a frequency generator to simulate the signal to verify the ECM sees the correct Hz?

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Dan Owner/Technician
Texas
Dan
 

… The P0128 will deprive the owner of A/C and put the temp gauge on max cold(just to get them to bring it in for a check up)… just clearing the code will restore both the A/C functionality and the gauge operation… The other stuff will need some checking… I'd put a stat in it and do a little more testing on the other concerns. … Dan H. … Hobbs … South texas …

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Timothy Owner/Technician
Wisconsin
Timothy
 

The MAF should have B+ on the Pnk/Blk, chassis ground on the Blk/Wht, and signal on the yellow, which is measured in Hz. What does the scanner say about G/sec., and/or Hz? Not reading at all, and all the signals are good? You're still at the PCM and/or the wiring. Check all signals at the ECM, not just at the sensor. The Tan/Blk is the ground for the IAT and has nothing to do with the MAF issue.

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Joshua Service Manager
Michigan
Joshua Resolution
 

Ended up being the MAF sensor.. I replaced it twice 1 with a used oem and one with a new after market one and then got another used oem and fixed it..

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Helpful
Eric Owner/Technician
Wisconsin
Eric
 

This post shows why testing is important. You made a lot more work for yourself and others here than if you would have taken the time to test the parts.

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Agree
David Owner/Technician
Alberta
David
 

Joshua, this one bothers me some. I have some skepticism regarding the original and then 3 more to make it work. It would have been good to hear of some test results as this is Diagnostic Network. Great if it is working fine now.

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