Checking exhaust gas temperature sender G235 and G236 — AUDI

🧭 Before you start

Fits: Audi A6 C5 (4B)

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• Connect vehicle diagnostic, testing and information systemVAS 5051B and select vehicle system "“01 - Engine electronics”" from list. Engine must be idling.
• The exhaust gas temperature senders are supplied with power via the fuel pump relay.
• Connect adapter cable, 121-pinV.A.G 1598/31 to connectors of wiring harness; do not connect engine control unit. Connect earth clip of test box to earth (arrow)24.

🔧 Engine codes this applies to

📋 Procedure

1. Connect vehicle diagnostic, testing and information systemVAS 5051B and select vehicle system "“01 - Engine electronics”" from list. Engine must be idling.
2. From list (1) select diagnostic function "“08 - Read measured value block”".
3. Use keypad (2) to enter "“112”" for "“Display group number 112”" and confirm by touching the Q key.
4. Check the readout in display zone (1) for cylinder bank 1 (right-side) and in display zone 2 for cylinder bank 2 (left-side).
5. Increase engine speed.

6. Switch off ignition.
7. Check voltage supply .
8. Check the wiring . [Note: The exhaust gas temperature senders are supplied with power via the fuel pump relay.]
9. Unplug brown electrical connector (1) at exhaust gas temperature sender 1G235 and black electrical connector (2) at exhaust gas temperature sender 1, bank 2G236.
10. Connect voltage testerV.A.G 1527B as follows:
11. Operate the starter briefly.
12. Refer to current flow diagram to check for open circuit in wiring for exhaust gas temperature sender G235 / G236 via fuse to fuel pump relay.
13. Connect adapter cable, 121-pinV.A.G 1598/31 to connectors of wiring harness; do not connect engine control unit. Connect earth clip of test box to earth (arrow)24.
14. ⚠ To prevent damage to electronic components, select appropriate measuring range before connecting measuring leads and observe test requirements. — Check for open circuit and short to positive or earth in the following wiring:
15. Repair open circuit or short circuit in wiring (refer to current flow diagram).
16. Renew exhaust gas temperature sender .

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