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Ask Chad Farhat Your Own Question
Chad Farhat
Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems
Category: Audi
Satisfied Customers: 3006
Experience:  Owner at Carolina Auto Service & Sales , 20 years Experience in Foreign & Domestic vehicles
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1999 Audi A6 Quattro 2.8 - Error code P1545 - throttle

Customer Question

1999 Audi A6 Quattro 2.8 - Error code P1545 - throttle control valve malfunction!
Submitted: 8 months ago.
Category: Audi
Expert:  Chad Farhat replied 8 months ago.

Hi, I'm Chad. Welcome to JustAnswer. I'm reviewing your question and I will be posting your reply ASAP.

Expert:  Chad Farhat replied 8 months ago.

Throttle drive and angle sensor for throttle drive, checking NOTE: Throttle drive -G186- and angle sensor -1- for throttle drive -G187- are located in the throttle valve control module -J338-. Test conditions - Throttle valve in closed throttle position; if necessary adjust accelerator pedal cable - Cruise control adjustment OK. - Power supply for throttle valve control module OK; checking See: Electronic Throttle Control Module > Testing and Inspection - Engine coolant temperature at least 80° C (176° F) - Automatic transmission selector lever in "P" or "N" Checking - Connect VAG 1551 or VAG 1552 scan tool and press buttons -0- and -1- to insert "Engine Electronics" address word 01 (with engine running at idle). See: Computers and Control Systems > Scan Tool Testing and Procedures > Connecting VAG 1551 Scan Tool Indicated on display Rapid data transfer HELP Select function XX - Press buttons -0- and -8- to select "Read Measuring Value Block" function 08, and press -Q- button to confirm input. Indicated on display Read Measuring Value Block HELP Input display group number XXX - Press buttons -0-, -5- and -5- to input display group number 55 (055), and press -Q- button to confirm input. Indicated on display (1-4 = display fields) Read Measuring Value Block 55 -> 1 2 3 4 - Compare display with specified values for idle air control (display fields 1-4):

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Display Group 55

If displayed values are OK:
- Press -> button.
- Press buttons -0- and -6- to select "End Output" function 06, and press -Q- button to confirm input.
- Switch ignition off.

Evaluation of display group 55

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Display Group 55

Explanation of 4-digit display

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Continuation
- Switch ignition off.
- Connect VAG 1598/22 test box to ECM harness connector. See: Computers and Control Systems > Scan Tool Testing and Procedures > Connecting VAG 1598/22 Test Box
- Switch ignition on.
- With throttle valve in closed throttle position, connect multimeter US 1119 (Fluke 83 or equivalent), and check resistance between ECM/test box sockets 59 and 66.

Specified value: 3-200 Ohms

If resistance is NOT OK:
- Disconnect 8-pin harness connector from throttle valve control module -J338-.

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- Check wiring for open circuit between ECM/test box and 8-pin throttle valve control module harness connector.
- Connector terminal 1 to ECM/test box socket 66
- Connector terminal 2 to ECM/test box socket 59
- Connector terminal 7 to ECM/test box socket 67
- Connector terminal 8 to ECM/test box socket 74
- Specified value: max. 1.5 Ohms

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- Check wiring of 8-pin connector for short circuit between wires, according to wiring diagram.
- Connector terminal 1 to ECM/test box socket 59
- Connector terminal 1 to ECM/test box socket 74
- Connector terminal 1 to ECM/test box socket 67
- Connector terminal 2 to ECM/test box socket 67
- Connector terminal 2 to ECM/test box socket 74
- Connector terminal 7 to ECM/test box socket 74
- Specified value: Infinity Ohms

If wiring is OK:
- Carry out adaptation of throttle valve control module to ECM.
- Check readiness code. If Diagnostic Trouble Code (DTC) memory has been erased, or ECM was disconnected, generate new readiness code. See: Computers and Control Systems > Monitors, Trips, Drive Cycles and Readiness Codes > Audi Drive Cycle/Readiness Code

Expert:  Chad Farhat replied 8 months ago.

Do you have a scanner so we can perform theses test

what is the car doing no throtle or lack of power

have you checked for any vacuum leaks, have you replace thrtole body, check wiring

what have you done so far ?

Please let me know

Thank You

Chad Farhat

ASE Certified Technician

Expert:  Chad Farhat replied 8 months ago.

i just want to see if you need any more assistance on it

Please let me know

Thank You

Chad Farhat

ASE Certified Technician