Test sequence

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Connect VAG1551 /1552 (Connecting scan tool and selecting engine electronics control module → Scan Tool VAG1551 , connecting .) Run engine at idle speed and press buttons 0 and 1 to select "Engine electronics" address word 01.

Indicated on display:

Rapid data transfer HELP
Select function XX

Press buttons 0 and 8 for the function "Read measured value block" and confirm entry with Q button.

Indicated on display:

Read measured value block
Enter display group number XXX

Press buttons 0 , 0 and 7 for "Display group number 7" and confirm entry with Q button.

Indicated on display:

Read measured value block 7 →
15.4 ° C 15.9 ° C 16.7 ° C
Observe coolant temperature figure in display field 4. The temperature figure must increase uniformly and without interruption.
In case of faults the fuel temperature is displayed as a substitute.
If no realistic display appears in display field 4 or the fuel temperature is displayed as a substitute. Check coolant temperature sensor and wiring connections to sensor as follows:

Press the → button.
Press buttons 0 and 6 for the function "End output" and confirm entry with the Q button.
Switch off ignition.

Fig 1: ECT Sensor Terminals 1 & 3

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Disconnect the connector from coolant temperature sensor.
Measure resistance between sender contacts C - 1 - +D - 3 -.

Fig 2: Resistance Values Graph

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Specification see diagram

Scale A shows resistance values for temperature range 0 to 50 ° C and scale B the values for temperature range 50 to 100 ° C.

Examples:

30 ° C corresponds to a resistance from 1500 to 2000 Ω
80 ° C corresponds to a resistance from 275 to 375 Ω

If specification is not obtained:

Replace ECT Sensor G62.
Check DTC memory and, if necessary, repair any malfunctions and then erase → Diagnostic Trouble Code (DTC) memory, checking and erasing .
Read-out the readiness code → Reading readiness code . If the DTC memory has been erased, the readiness code must be generated again → Readiness code, setting .

If specification is obtained:

Remove wiper arms and plenum cover: → 92 WINDSHIELD WIPER & WASHER SYSTEM

Fig 3: Identifying Test Box V.A.G 1598/31 Connected To Control Module Wiring Harness

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Connect test box VAG1598/31 to control unit wiring harness.

Fig 4: 4-Pin Electrical Harness Connector & Terminals

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Check wiring between test box and 4-pin connector for open circuit using wiring diagram.

Terminal 3+ socket 112

Terminal 4+ socket 104

Wire resistance: max. 1.5 Ω

Check wires for short to one another, to vehicle Ground and to battery positive (B+).

Specification: ∞Ω

If wiring and the resistance measurement values are OK, replace Diesel Direct Fuel Injection Engine Control Module J248 → Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) J248 , replacing .