Something for everyone...

[Jef]

ST?ID=93174

2009 S5, MMI not working, no communication with anything on the infotainment bus. As per par for the course "we've checked everything"....

I ask the tech to go to [Applications] - [Optical Bus Diagnostics] then [Start]. Gets electrical error for the Control Head which is the J794 on this car. Check fuse ST3 SF5.... and there is no fuse.

Pops in a fuse....

MMI working now. Need to file a police report, the fuse bandit has struck again!

 

[Jef]

ST?ID=93248

2009 A4... 43 fault codes in the engine. Tech cleared them out and tried to test drive, can runs very poorly and 43 fault codes again. Starts rambling off generic key works in the fault codes.. engine mounts, EVAP, intake runner, cam shaft..

OK, lets stop there... the cam shaft one, what is the P code? P11A1 Cam Adjustment Actuator A; Cylinder 1 open circuit... lets just worry about that one fault code... this goes back to fuse SB7, is that fuse good?

Does some digging to access fuse and it is popped.

Codes clear out now... will do follow up test drive.

Tech was overwhelmed by the number of fault codes. If you got a crazy shopping list and see a common theme (open/short codes in this case), then pick just 1 item and worry about it. In many cases, similar failures are related so fixing 1 simple issue fixes 42 other issues.

 

[Jef]

ST?ID=93263

2019 Atlas, some front end damage due to whatever... but now the ECM is loaded with fault codes.

• 24989 - Control Circuit for Coolant Bypass Valve P2682 00 [039] - Short to GND
• 12347 - Coolant Pump Control Circuit P2602 00 [039] - Short to Ground
• 9042 - Bank 1 Camshaft B (Exhaust) Position Actuator P2090 00 [101] - Short to Ground
• 11942 - EVAP System Leak Detection Pump Heater Control Circuit P240B 00 [039] - Short to GND
• 11939 - Control Circuit for EVAP Vent Control P0448 00 [039] - Shorted
• 11948 - EVAP Leak Detection Pump Control Circuit P2401 00 [039] - Short to GND
• 2798 - Bank 1 Camshaft A (Intake) Position Actuator P2088 00 [101] - Short to Ground
• 9028 - Intake Manifold Tuning Valve Control Circuit (Bank 1) P0661 00 [101] - Short to GND
• 4235 - Evap System Purge Control Valve (N80) P0458 00 [039] - Short to Ground

.... So again, pick an easy item, Bank 1 Camshaft B (Exhaust) Position Actuator in this case... this is the N318 Exhaust Camshaft Adjustment Valve 1 in the factory wiring diagram... start tracing it back... and we land on fuse SB4. So how is fuse SB4?

Replace fuse, car is happy.

The guy here at the body shop told me he checked fuses.

 

[Jef]

TSD?ID=123021

2010 Tiguan, for whatever reason the subframe and power steering rack (J500) was removed. Everything put back together and now there is no power steering, no comm with J500. Made sure the J500 was plugged up. OK, so get an old school incandescent test light, ground the clip on the battery and check fuse SA2....

 

[Jef]

ST?ID=93811

2017 Passat at a body shop.. .uh oh... light front end damage and has been repaired. A mobile tech, Kirk, is being told by body shop that customer stated there were no issues with the car prior to the fender bender. The ABS and CAN Gateway have this code:

02849 - Control Module for Lane Change Assistance (J769)
004 - No Signal/Communication

Looking into the wiring diagrams... there ain't much info about the J769 other than it is located at the right rear of the car, and it is wired up on the CAN BUS network (duh)... but I can't find any more info. Kirk needed to head out, I'll do more digging and call back with what I learn.

I do find info on the J1086 which is listed as the Blind spot detection control module, located in the right rear. I'm not sure, but I think it works like this:

• Fully loaded car, you get a J769 - Lane change assistance control module (with ACC)
• Base model car, you get a J1086 - Blind spot detection control module (without ACC)

Back in touch with Kirk, explain the J769 vs J1086 but at any rate, check out fuse SC17, that is what powers the J1086. He will relay the info back to the body shop.

Kirk calls back, body shop claims they fixed everything and the only issue was the LED light for blind spot warning on the right side view mirror was not plugged up. I call BS, there is no way having a LED ligth unplugged caused a module to be off line. Kirk agrees, this story doesn't pass the sniff test and he will try to get back to the car.

Back at the car, Kirk finds that nothing is fixed, still no comm codes in ABS and CAN modules. Take a look at fuse SC17....

Replaced missing fuse, all codes clear out, car is happy now.

 

[Jef]

TSD?ID=124411

2012 Jetta, clock spring was replaced and now it has codes for no comm with Steering Angle Sensor (G85). Tech was thinking the car needed the Steering Wheel Electronics (J527) code. Submits an Auto-Scan:

01-Engine -- Status: Malfunction 0010
02-Auto Trans -- Status: Malfunction 0010
03-ABS Brakes -- Status: Malfunction 0010
04-Steering Angle -- Status: Cannot be reached 1100
08-Auto HVAC -- Status: OK 0000
09-Cent. Elect. -- Status: Malfunction 0010
15-Airbags -- Status: Malfunction 0010
17-Instruments -- Status: OK 0000
19-CAN Gateway -- Status: Malfunction 0010
25-Immobilizer -- Status: OK 0000
56-Radio -- Status: OK 0000

Eh, this car is poverty spec (PR-AW0 Low Line), a quick look at the wiring, G85 is powered by fuse SC27, a big phaaat 1A fuse.... tech starts looking under dash...

There is no fuse in SC27. Replaced missing fuse, G85 back online.

 

[Jef]

ST?ID=94989

2011 Jetta, engine doesn't crank.

Car at repair shop. Owner tells tech this happened after he (owner of car) pulled the radio out. I'm told there are no fault codes anywhere, and the instrument cluster always has a message to push clutch pedal in to start, even if clutch pedal is on the floor.

This car uses a Clutch Position Sensor (G476). Gets power from fuse SB10 as per wiring diagram... so how is fuse SB10? Tech pokes around for a minute... good. OK, G476 at T5m/5 do you have power? Nope. SB10 is good? Double checks... well, all fuses here are good... oh, position 10 is empty.

Popped in a fuse, car cranks overs over and fires up. Asked tech to touch base with owner of vehicle... fuse ≠ radio

 

[Jef]

ST?ID=95305

2012 Passat, AC doesn't work. Customer brings car to shop wanting AC compressor, condenser and dryer. Tech blindly does this as per customers request. All back together, AC doesn't work. Are there any fault codes in the HVAC control module? Yes, one:

• B10AE High Pressure Sensor short to ground

Did it originally have this fault code? Yes, pretty sure it was there to begin with. The AC pressure switch, G65, do you power and ground across /1 and /3? No power. OK, take a look at fuse SC4, it is good? Tech pokes around for a minute... it would seem the fuse was visited by a fluffer at some point.

Replaced blown fuse, AC now works.

 

[Jef]

ST?ID=96201

2007 Golf with a 1.4 supercharger engine (ZZZ VIN). Has the following DTC:

• P10AD 004269 VCDS-EN-190211 Magnetic Clutch for Supercharger: Open Circuit

So how is fuse SB21? I can hear the tech shuffling around, gets into engine bay.... um..... 9... 14.... 19, 20.. 21...

 

[Jef]

TSD?ID=127605

2005 A3 towed into shop. HPFP was busted up. The tech who had been working on it this week seems to of been a know-it-all who replaced the HPFP and then proceeded to toss several more parts at the car but could not get the engine to run smooth.... and with that, the tech quit without warning and left.

Owner of shop calls up. Various codes for stuff being unplugged, can't read the note the tech scribbled but has the following fault codes:

• P2294 - Fuel Pressure Regulator Valve (N276): Open Circuit
• P1602 - Power Supply Terminal 30: Voltage too Low

Seems that the tech never put a battery charger to this car and had run the battery down, so the Term 30 shouldn't be a big deal. As for the HPFP, lets take look at fuse SB33......

Replaced missing fuse, engine fired up fine, runs smooth now and all codes cleared out.

 

[Jef]

ST?ID=98298

2011 Tiguan. Repair shop A did work, returned to customer who drove a few miles and had issues..... Shop A bangs rocks together, maybe tried some Immob defeat or something.... still having issues, so shop A drives Tiguan to shop B and this is where Ross-Tech comes into the fold.....

Tiguan is dead as a doornail. Can't get the car to wake up via brakes/high beams/flashers. Fuses for J533 are good. Unplug J533, has power on T20/1, but no ground on T20/11. This call is right before lunch, so we end the call with the tech to backprobe T20/11 and ground it.

Tech call back after lunch, has J533 grounded. Turn ignition on, get a dinging noise from cluster and radio turns on, so that is different, but nothing else. Brakes/high beams/flashers and the J533 wakes up. J527 shows ignition switch (twisty key type) is working, Term 15 on/off as it should be. But J533 shows 0V for Terminal 15.

Terminal 15 is controlled by J681 relay, that in turn is controlled by J519. No codes for the relay in the J519. Check fuse SB7... it ain't there. Replace fuse, car wakes up, engine fires up.

OK, so shop A drove it down to your shop....

 

[Jef]

TSD?ID=132070

2006 Beetle, speedometer doesn't work. Did output test in address 17 Instruments, needle sweep test went as expected. Manual transmission, so G22... have power and ground at /1 and /3 to the sensor? No power.

Fuse S7? ..... that was stupid of me... I do this to myself very time..... goes to a random parts car and gets a fuse and pop into the Beetle.

 

[Jef]

TSD?ID=133781

Tech says owner of 2011 Tiguan was driving and hit a large pothole. Arrived at destination and shut engine off. Came back to Tiguan and engine won't crank, can't get it out of gear. Towed 70 miles to said repair shop. Finds that the TCM won't commuincate and fault codes for TCM no signal / message.

Fuse SC25 good? No, there isn't a fuse there, but there is a fuse in SC26 (which isn't used). Puts fuse from SC26 to SC25, engine fires up, TCM communicates.

That was one hell of a pothole.

 

[Jef]

<buzz feed>
Local forum member claims he saved $580 by doing this one simple trick... you will be amazed!!!!!

Resolved - 2012 MK6 JETTA S no steering angle communication

I need help with this, terminal 1 on the plug has no power, but also according to the wiring diagram power comes from fuse 35, and there nothing on that position, no fuse or wiring behind it I did get a new clockspring ( which houses the sensor) and nothing If I jump power to that wire...

forums.ross-tech.com

</buzz feed>

 

[Jef]

ST?ID=103455

2006 Jetta, back story is the battery was replaced at [XYZ] shop, car is now dead and at [ABC] shop. Flashers don't work, so doing the flashers, brake and high beams trick isn't waking anything up.

SB24 good for J533 good? Missing. Replace fuse, some activity in the instrument cluster. Flashers/brake/high beams is now waking up J533, but only for a minute or two. As expected, very limited communication... J527 is also no comm.

SB16 good for J527? Missing. Replaced fuse, car fires up and runs now.

Not sure if other shop trying to rip off the senior citizen owner.... or maybe his kids are trying to keep him from driving anymore.

 

[Jef]

ST?ID=103780

2012 Tiguan, wipers dead. J519 has code for no comm with wiper motor (J400). Do you have power/ground at the wiper motor? No power.

... fuse SB22 good? Could hear the palm smacking the forehead. Replaced missing fuse and now the wipers work.

 

[stefdds]

 

[Jef]

TSD?ID=138609

2007 A6, battery replaced with aftermarket battery, now radio/MMI is dead. He had tweaked battery coding, radio/MMI still dead.

Start VCDS, go to [Applications] --> [Optical Bus Diagnostics] --> [Start] and let me know the results. Control Head is electrical error.

SC10 ST1 is the fuse for that... any good? Popped.
Replaced fuse, cycled key... and radio/MMI comes on.

$40 fuse.

 

[Uwe]

$40 fuse.

Fuse: 50 cents.
RT Support Ticket: $40.
Knowing which fuse is likely at fault: Priceless!

-Uwe-

 

[Jef]

ST?ID=104911

2012 CC, can't get codes to clear out:

006438 - Relay for Aux Coolant Pump (J496) P1926 - 000 - Short to Ground - Intermittent
006439 - Relay for Aux Coolant Pump (J496) P1927 - 000 - Open Circuit
009216 - EVAP Leak Detection Pump Control Circuit P2400 - 000 - Malfunction - MIL ON
009217 - EVAP Leak Detection Pump Control Circuit P2401 - 000 - Short to GND - Intermittent - MIL ON

15 seconds into the wiring diagram, well LDP and a J151 Coolant circulation pump relay are off the same fuse, SB16. And yep, simple fuse issue, swapped it out and the codes cleared out now. Not technically a $40 since this customer purchases in bulk... so only a $20 fuse... so lets round up the numbers here, about a 2 minute phone call, $20 spent, so $600 per hour is what I'm worth now.