Checking voltage supply and wiring to control unit: VW Sharan I / SEAT Alhambra (AEH, AKL, APF, APK, …)

🧭 Before you start

Fits: VW Sharan I / SEAT Alhambra (7M)

• Special tools named: V.A.G 1594
• Renewed: accelerator position sender

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• If the fault memory has been cleared or the engine control unit was separated from the continuous positive supply, the readiness code must be regenerated: 01Generating readiness code.
• On vehicles with an automatic gearbox the gearbox control unit must be additionally adapted: Self-diagnosis for 5-speed automatic gearbox 09B01Initiating basic setting.

🔧 Engine codes this applies to

📋 Procedure

1. Pull 6-pin connector off accelerator position sender.
2. Switch on ignition.
3. Connect multimeter to measure voltage using auxiliary cables from V.A.G 1594 A to the following connector contacts. Contact 1 + ground contact 1 + 5 contact 2 + ground contact 2 + 3 specification: at least 4.5 V
4. Switch off ignition.
5. First check whether a coded radio is fitted. If so, obtain anti-theft coding.

6. Remove battery.
7. Connect test boxV.A.G 1598/31 to control unit wiring harness. The engine control unit remains disconnected.
8. Check cables between test box and 6-pin connector for open circuit using current flow diagram. Contact 1 and test box socket 72, contact 2 and test box socket 73, contact 3 and test box socket 36, contact 4 and test box socket 35, contact 5 and test box socket 33, contact 6 and and test box socket 34, line resistance : max. 1.5 Ω
9. Additionally check wires for short to one another, to vehicle earth and to battery positive. Specification: ∞ Ω.
10. Renew accelerator position sender .
11. Read and erase fault memory 01Reading and erasing engine control unit fault memory.
12. Read readiness code 01Reading readiness code.
13. If the fault memory has been cleared or the engine control unit was separated from the continuous positive supply, the readiness code must be regenerated: 01Generating readiness code.
14. On vehicles with an automatic gearbox the gearbox control unit must be additionally adapted: Self-diagnosis for 5-speed automatic gearbox 09B01Initiating basic setting.

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