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mike_a_mechanic
mike_a_mechanic, Mechanic
Category: Audi
Satisfied Customers: 5470
Experience:  17 years experience as a auto mechanic, foreign and domestic.5 years running my own repair business.
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A6 3.2 Quattro fault code 16775, i have changed all 4 timing

Customer Question

A6 3.2 Quattro fault code 16775, i have changed all 4 timing chains, run engine but still same fault code present. swapped cam sensors around, fitted a new exhaust cam adjuster
on bank 2, same fault code present, can you help please
Submitted: 4 years ago.
Category: Audi
Expert:  mike_a_mechanic replied 4 years ago.


Hello, welcome to Just Answer/Pearl. My name is Mike, I will
do my very best to assist you with your question today.

was the code present before any repairs were made,or only after?
Customer: replied 4 years ago.

yes fault code 16775 was present when the vehicle come in, can i call you or if you want to call me my phone number is 01604 870677

Expert:  mike_a_mechanic replied 4 years ago.
Ok,is the vehicle running normal,with just the light present? Or is there drive ability issues as well?
Customer: replied 4 years ago.
Relist: Answer came too late.
i need an audi specialist urgent,
Expert:  mike_a_mechanic replied 4 years ago.
Is the light the only issue?
Is the vehicle running normal?
Customer: replied 4 years ago.


misfire on cylinders 4,5 & 6. bringing up fault code for cylinder 5 misfire.


sometimes cylinder 6. exactly same simtoms as when it first come in.


compressions on all 6 cylinders only at 100 psi.

Expert:  mike_a_mechanic replied 4 years ago.
Ok,I'm going to get some information together for you to check some things ,I will opt out in the mean time and open the question back up incase another expert can help you right away,thank you.
Customer: replied 4 years ago.


ok thanks Mike

Expert:  mike_a_mechanic replied 4 years ago.

Ok,this issue that you are having is consistent with a loss of communication from the ECM to the vehicle that is causing your issue.

 

 

 

 

Here is some testing instructions.

 

 

Camshaft Position Sensors, Checking Camshaft Position Sensors, Checking This procedure is used to check Camshaft Position (CMP) Sensors G40, G300, G163, G301.
NOTE:Use only gold-plated terminals when servicing terminals in the electrical harness connectors of the Camshaft Position (CMP) Sensor G40.
Special tools, testers and auxiliary items required
Multimeter.
Diode test lamp.
Wiring diagram.
Test requirements
The Engine Control Module (ECM) J623 fuses OK.
Engine Control Module (ECM) Power Supply Relay J363 OK.
Battery voltage at least 12.5 V.
All electrical consumers such as, lights and rear window defroster, switched off.
Vehicles with automatic transmission, shift selector lever into position "P" or "N".
A/C switched off. Ground (GND) connections between engine/transmission/chassis OK.
Ignition switched off. Test procedure

Checking activation
Using the Diode test lamp , check for voltage between terminal 2 (CMP sensor signal) and terminal 1 (B+) with the electrical harness connector connected to the Camshaft Position (CMP) Sensor. Operate the starter for a few Sec.
The LED must blink.
NOTE:Voltage testers do not go out completely during low current pick-up between activations by the ECM, but rather continue to glow a little and then get significantly brighter during activation.
Switch ignition off. If the LED blinks:
Replace the relevant Camshaft Position (CMP) Sensor. Refer to 24 - FUEL INJECTION SYSTEM .
If the LED does not blink:
Checking voltage supply
Disconnect the relevant Camshaft Position (CMP) Sensor electrical harness connector.
Switch the ignition on.

Using a Multimeter , check the Camshaft Position (CMP) Sensor electrical harness connector terminal 1 to engine ground for voltage.
Camshaft Position (CMP) Sensor Electrical Harness Connector Terminal Measure to 1
Engine Ground (GND)
Specified value: about 5 V. Switch the ignition off.

Checking signal wire
Using a Multimeter , Check the Camshaft Position (CMP) Sensor electrical harness connector terminal 2 to engine ground for voltage.
Camshaft Position (CMP) Sensor Electrical Harness Connector Terminal Measure to 2
Engine Ground (GND)
Switch the ignition on.
Specified value: Battery voltage. Switch the ignition off.

Checking Ground (GND)
Using a Multimeter , Check the Camshaft Position (CMP) Sensor electrical harness connector terminal 3 to engine ground for voltage.
Camshaft Position (CMP) Sensor Electrical Harness Connector Terminal Measure to 3
Battery positive (+)
Specified value: about 10 V.
Switch the ignition off.
If the specification was not obtained: Checking wiring
If the manufacturers test box is being used, perform the following step. Install the test box VAG1598/42. Refer to 24 - FUEL INJECTION SYSTEM .
If the manufacturers test box is not being used, perform the following step.

Remove the Engine Control Module (ECM) J623. Refer to ? Engine Control Module, Replacing.
Using a Multimeter , Check the Camshaft Position (CMP) Sensor electrical harness connector to the Engine Control Module (ECM) J623 electrical harness connector for resistance.
Camshaft Position (CMP) Sensor G40 (bank 1).
Camshaft Position (CMP) Sensor Electrical Harness Connector Terminal Engine Control Module (ECM) J623 Wiring Harness Connector Terminal or Test box Socket 1 Battery positive (+)11 2 (signal)25 3 Ground (GND)40
Camshaft Position (CMP) Sensor 2 G163 (bank 2).
Camshaft Position (CMP) Sensor Electrical Harness Connector Terminal Engine Control Module (ECM) J623 Wiring Harness Connector Terminal or Test box Socket 1 Battery positive (+)11 2 (signal)9 3 Ground (GND)40
Camshaft Position (CMP) Sensor 3 G300 (bank 1).
Camshaft Position (CMP) Sensor Electrical Harness Connector Terminal Engine Control Module (ECM) J623 Wiring Harness Connector Terminal or Test box Socket 1 Battery positive (+)11 2 (signal)54 3 Ground (GND)40

Camshaft Position (CMP) Sensor 4 G301 (bank 2).
Camshaft Position (CMP) Sensor Electrical Harness Connector Terminal Engine Control Module (ECM) J623 Wiring Harness Connector Terminal or Test box Socket 1 Battery positive (+)11 2 (signal)24 3 Ground (GND)40
If the specification is not obtained: Check the wiring for a short circuit to Battery positive (+) or an open circuit.
If necessary, repair the wiring connection.
If no malfunction can be found: Replace the Engine Control Module (ECM) J623. Refer to ? Engine Control Module, Replacing Assembly is performed in the reverse order of removal. After the repair work, the following work steps must be performed in the following sequence:
Check the DTC memory.
If necessary, erase the DTC memory. Refer to Diagnostic Mode 04 - Reset/Delete Diagnostic Data.
If the DTC memory was erased, generate readiness code. Refer to Readiness Code