Checking Activation of Cmp Sensor (camshaft Position Sensor) Audi A8 D3

Use test leads VAG1594 connector test kit when performing the following tests.

Scheme 17

1. Push back rubber grommet on relevant CMP sensor connector.
2. Connect VAG1527 diode test lamp to terminals 1 and 2 of CMP sensor connector from behind (without disconnecting connector from sensor). NOTE: The connector terminals are numbered on the back of the connector.
3. Operate starter for few seconds. Diode test lamp should blink briefly once every two engine revolutions. NOTE: Diode test lamps with a low current draw continue to glow faintly between impulses from the engine control module (rather than going out completely) and become much brighter when receiving an impulse.

If the diode test lamp does not flash, test the voltage supply.

Scheme 18

1. Disconnect harness connector from relevant CMP sensor.
2. Switch ignition on.
3. Connect multimeter (Fluke 83 or equivalent) (voltage measurement range) between engine Ground (GND) and socket 1 of connector. Specification: approx. 5 V

Scheme 19

1. Switch ignition on.
2. Connect multimeter (Fluke 83 or equivalent) (voltage measurement range) between engine Ground (GND) and socket 2 of relevant connector. Specification: approx. battery voltage

Scheme 20

1. Connect multimeter (Fluke 83 or equivalent) (resistance measurement range) between socket 3 on connector and engine Ground (GND). Specification: Continuity Resistance in wiring: max. 1.5 Ohms

If all the readouts match the specifications but the diode test lamp does not flash (measurement taken between terminals 1 and 2 without unplugging connector and while operating starter)

1. Replace relevant CMP sensor.

If the readouts do not match the specification, check the wiring.

Scheme 21

1. Connect VAG1598/31 test box to wiring harness for engine control module. Do not connect to engine control module itself. See «WIRING AND COMPONENT CHECK WITH VAG1598/31 TEST BOX»(ref-216438-S11057563412006020800000) .
2. Check wiring connection from CMP sensor to engine control module for open circuit and/or short circuit to B+ or Ground (GND). CAMSHAFT POSITION SENSOR - OPEN CIRCUIT AND/OR SHORT TO GROUND CHECK Camshaft Position (CMP) Sensor -G40- (Bank 2) 3-pin connector on wiring harness, socket VAG1598/31 test box, socket 1 (B+) 98 2 (signal) 86 3 (Ground (GND)) 108 Camshaft Position (CMP) Sensor 2 -G163 - (Bank 1) 3-pin connector on wiring harness, socket VAG1598/31 test box, socket 1 (B+) 98 2 (signal) 87 3 (Ground (GND)) 108 Resistance in wiring: max. 1.5 ohm See SYSTEM WIRING DIAGRAM .
3. Repair any open/short circuit as necessary.

If all the test results so far have been OK but a malfunction related to the CMP sensor is displayed again after erasing the DTC memory as a test measure, the cause may be as follows

1. Rotor ring for CMP sensor misaligned; test phase position.

Scheme 22

1. Connect vehicle diagnostic, testing and information system VAS5051 or VAG1551 scan tool and select engine electronics control module by entering address word "01". See «VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM VAS5051 OR VAG1551, CONNECTING AND SELECTING FUNCTIONS»(ref-216437-S40962647232006020800000) . Engine must be idling. Indicated on display
2. Press buttons -0- and -8- to select function "Read Measuring Value Block" and confirm entry with -Q-button.

Indicated on display

Scheme 23

Scheme 24

1. Press buttons -0-, -9- and -3- to select "Display Group 093" and confirm entry with -Q- button. Indicated on display
2. Check specified display values for CMP sensors. DISPLAY GROUP 093: PHASE POSITIONS OF CMP SENSORS (BANK 1 AND BANK 2) WITH ENGINE IDLING Display fields 1 2 3 4 Display Group 093: Phase positions of CMP sensors (Bank 1 and Bank 2) with engine idling Display xxx RPM xx % -15 to 10 °KW -15 to 10 °KW Indicates Engine speed (RPM) Engine load Phase position Bank 1 Phase position Bank 2 Range min.: 550 RPM max.: 6600 RPM Specified value 600 to 660 RPM -15 to 10 °KW -15 to 10° KW Note If readouts do not match specifications, unbolt CMP sensor and check whether rotor ring is properly mounted on camshaft. If it is incorrectly mounted, the locating lug will be flattened when the securing bolt is tightened. Also check valve timing.