Test sequence
WARNING: This page is about a different variant/trim than selected.
- Connect V.A.G 1551/1552 (Connecting scan tool and selecting engine electronics control module → Scan Tool V.A.G 1551 , 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 - to select "Read measured value block" function 08 and confirm entry with - Q - button.
Indicated on display
| Read measured value block HELP Input display group number XXX |
- Press buttons - 0 - , - 0 - and - 7 - to select "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 the case of a malfunction the fuel temperature is displayed as a substitute.
- Press the → button.
- Press buttons - 0 - and - 6 - to select "End output" function 06 and confirm entry with - Q - button.
- Switch ignition off.
If the display in field 4 appears unrealistic or the fuel temperature is displayed as a substitute, check the ECT sensor and wiring connections to the sensor as follows:
- Disconnect 4-pin connector from ECT sensor - arrow -.
- Measure resistance between sensor terminals 1 (Ground) and 3 (signal).
- Specification: correlate resistance measurement with chart
NOTE:
- Scale A shows resistance values for temperature range 0 to 50 ° C and scale B shows 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 readiness code → Readiness code, displaying .
If 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
- Connect test box V.A.G 1598/22 (through my 1999) or V.A.G 1598/31 (from my 2000) to control module wiring harness.
- Check wiring between test box and 4-pin connector for open circuit according to wiring diagram:
| Test box socket no. | ||
| Terminal | Through MY 1999 | From MY 2000 |
| 1 | 70 | - |
| 3 | 54 | 112 |
| 4 | - | 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 engine control module → Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) J248 , replacing .