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Old 01-03-2017, 05:36 PM   #1 (permalink)
Av8r47d
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Wastegate Solenoid Help

Been troubleshooting a soft wastegate actuator on a new to me 94 6.5L. Did a lot of reading on here over the weekend but this is my first post.

I noticed the wastegate actuator rod was easily moveable with the truck at idle. Pulled off the vacuum line at the actuator and felt no vacuum. Went back to the solenoid and found a few cracked lines. Replaced all those lines and just for fun hooked the WG actuator line up direct. Wastegate rod pulled in tight and was not moveable, so I assumed bad solenoid. Replaced solenoid and still nothing at wastegate actuator with everything hooked up correctly.
-Next step, measured vacuum at solenoid= 18-21".
-Checked voltage at solenoid= first check no voltage.
-Checked voltage on B pin of MAP=2.47V~ at idle.
-Back to checking voltage at solenoid due to questionable volt meter(heh)=13v between blue wire and ground.
-Checked voltage between two pins on canon plug=13v. This confused me cause I read in a post that it should be 5v. Anyone have any ideas?
-Plugged solenoid back in, no operation.
-Bench tested old and new solenoid by applying 12v across pins- both solenoids worked.

At this point I am thinking bad canon plug is not making contact with pins on solenoid. Anyone have any insights? Would the canon plug be a dealer only item or is there another source?

Thanks in advance

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1994 Chevy 2500 6.5L TD "Snow White"
S&B Cold Air intake
PMD on fender well
4" exhaust & 2.5" crossover
Heath Diesel TurboMaster
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Glowshift Boost and EGT
Leroy Diesel boost bolt, OPS extension, and LP relay harness
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Old 01-03-2017, 06:19 PM   #2 (permalink)
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Quote:
Originally Posted by Av8r47d View Post
Been troubleshooting a soft wastegate actuator on a new to me 94 6.5L. Did a lot of reading on here over the weekend but this is my first post.

I noticed the wastegate actuator rod was easily moveable with the truck at idle. Pulled off the vacuum line at the actuator and felt no vacuum. Went back to the solenoid and found a few cracked lines. Replaced all those lines and just for fun hooked the WG actuator line up direct. Wastegate rod pulled in tight and was not moveable, so I assumed bad solenoid. Replaced solenoid and still nothing at wastegate actuator with everything hooked up correctly.
-Next step, measured vacuum at solenoid= 18-21".
-Checked voltage at solenoid= first check no voltage.
-Checked voltage on B pin of MAP=2.47V~ at idle.
-Back to checking voltage at solenoid due to questionable volt meter(heh)=13v between blue wire and ground.
-Checked voltage between two pins on canon plug=13v. This confused me cause I read in a post that it should be 5v. Anyone have any ideas?
-Plugged solenoid back in, no operation.
-Bench tested old and new solenoid by applying 12v across pins- both solenoids worked.

At this point I am thinking bad canon plug is not making contact with pins on solenoid. Anyone have any insights? Would the canon plug be a dealer only item or is there another source?

Thanks in advance
Welcome to the forum.

As listed in the FAQ sticky on top of the 6.5L section.
Wastegate Solenoid - the computer operated solenoid valve that regulates the amount of vacuum
going to the wastegate actuator on the turbo. This should hold the wastegate shut at idle. Not-so-common troubleshooting ideas to insure proper operation can be found in this link: https://www.dieselplace.com/forum/63-...lem-codes.html

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Old 01-03-2017, 08:00 PM   #3 (permalink)
Glagulator
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I have had this problem several times.
I noticed that banging on the solenoid would cause the actuator to start moving.
A little oil in the solenoid fixed it for a while but eventually had to replace.
Try banging/tapping on the solenoid with a screwdriver and watch the actuator for movement.
Your testing seems to show that everything is OK. The yellow wire on the solenoid is a pulse width
modulated ground signal so a voltage reading may not mean much.
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Old 01-03-2017, 08:42 PM   #4 (permalink)
Glagulator
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Make sure the lines are like this.


https://www.dieselplace.com/forum/***...1&d=1483494062
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File Type: jpg 99-WG-SOL.jpg (67.8 KB, 27 views)
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There are 10 kinds of people in this world; Those who understand binary and those who don't.

99 CREW LONG SRW C3500 work truck 199k+ mi. orig. motor & trans 4.10, modded engine harness, new oil cooler & lines, all new front end parts and poly bushings, trans poly mount, all new brakes.
96 SUBURBAN K2500 wife's truck 210k+ mi. orig. motor & trans, 3.73...
95 C2500 Suburban 6.5td HO w/p, timing set, HB & pulley, all rubber hoses, modded engine & main harness, converted to OBD2, PMD to bumper...
95 C1500 Suburban 6.5td rebuild tranny, convert to DB2, replacing as many parts as I can.
96 C2500 Suburban 7.4L converting to 6.5td w/ DB2, 4L80, 3.73
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Old 01-03-2017, 09:35 PM   #5 (permalink)
Av8r47d
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Thanks for the reply's. The solenoid is brand new and worked when I bench tested it, but I am going to try wiggling the connector and see if the actuator moves. Thanks for the tip.
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1994 Chevy 2500 6.5L TD "Snow White"
S&B Cold Air intake
PMD on fender well
4" exhaust & 2.5" crossover
Heath Diesel TurboMaster
Lubrication Specialist oil cooler lines
Glowshift Boost and EGT
Leroy Diesel boost bolt, OPS extension, and LP relay harness
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Old 08-12-2017, 01:27 PM   #6 (permalink)
vabel
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Av8r47d. Did you find a solution? I am having the exact same problem and have bench tested my old actuator (as well as the new one I unfortunately purchased). They click when putting 12v to them on the bench but neither do when connected to the cannon connector. Yet I have about 11v on the cannon connector when the key is on. Frustrating.....
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Old 08-12-2017, 01:52 PM   #7 (permalink)
DieselPro
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The 12 volts is pulsed to the solenoid from the ecm. Do not hook 12volts directly to the wastegate solenoid.

Perhaps you damaged the unit or the ECM with your test methods. Some have squirted WD 40 into the unit with good results.

Last edited by DieselPro; 08-12-2017 at 01:53 PM.
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Old 08-12-2017, 02:43 PM   #8 (permalink)
vabel
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Thks for the info.

I only put a digital multi meter across the pins of the canon connector coming from the truck's wiring harness so I am sure I did not damage anything on the truck.

Based on your msg, I assume that the "ECM" controls this solenoid? Thanks again.
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Old 08-12-2017, 02:51 PM   #9 (permalink)
Glagulator
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Actually the WGS gets constant 12v. (pink wire) and the PCM pulse width modulates the ground (yellow wire).
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99 CREW LONG SRW C3500 work truck 199k+ mi. orig. motor & trans 4.10, modded engine harness, new oil cooler & lines, all new front end parts and poly bushings, trans poly mount, all new brakes.
96 SUBURBAN K2500 wife's truck 210k+ mi. orig. motor & trans, 3.73...
95 C2500 Suburban 6.5td HO w/p, timing set, HB & pulley, all rubber hoses, modded engine & main harness, converted to OBD2, PMD to bumper...
95 C1500 Suburban 6.5td rebuild tranny, convert to DB2, replacing as many parts as I can.
96 C2500 Suburban 7.4L converting to 6.5td w/ DB2, 4L80, 3.73
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Old 08-12-2017, 02:57 PM   #10 (permalink)
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The ECM (PCM) controls boost by pulses to the wastegate solenoid. Normally the valve is on at idle. When the ECM sees boost it will pulse the wastegate valve off which will vent vacuum and allow the wastegate valve to open and reduce boost pressure.

So your wastegate should be very firm at idle (hard to open by hand).

I have modified the wastegate on a few vehicles by just adding a spring to the wastegate arm. The valve still functions but adds just a little more boost without gutting the whole system.

As side note Glagulator is right about the grounding thru the ECM


Last edited by DieselPro; 08-12-2017 at 02:59 PM.
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