Closed Throttle Position (CTP) Switch, Checking
Required special tools and test equipment
- VAG 1551 or VAG 1552 Scan Tool (ST) with VAG 1551/3 adapter cable
- VAG 1598/22 test box
- Multimeter US 1119 (Fluke 83 or equivalent)
- VW 1594 connector test kit
- Wiring diagrams
NOTE: The Closed Throttle Position (CTP) switch -F60- is inside 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
- 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).
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-, -0- and -5- to input display group number 5 (005), and press -Q- button to confirm input.
Indicated on display (1-4 = display fields)
Read Measuring Valve Block 5 ->
1 2 3 4
- Check Closed Throttle Position (CTP) switch (display field 4):
Continuation
- Switch ignition off.
- Connect VAG 1598/22 test box to ECM harness connector.
- Connect multimeter US119 (Fluke 83 or equivalent) and check resistance between test box sockets 67and 69.
Specified value: max. 5.0 Ohms
- Open throttle slowly.
Specified value: infinity Ohms
If resistance is NOT OK:
- Disconnect 8-pin harness connector for throttle valve control module -J338-.
- Check wiring for open circuit between ECM/test box and 8-pin harness connector.
- Connector terminal 3 to ECM/test box socket 69
- Connector terminal 7 to ECM/test box socket 67
- Specified value: max. 1.5 Ohms
- Check wiring for short circuit between ECM/test box and 8-pin harness connector.
- Connector terminal 7 to ECM/test box socket 69
- Specified value: infinity Ohms
- Reconnect throttle valve control module harness connector.
If wiring is OK:
- Replace throttle valve control module -J338-.
- 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.