26-20
Test sequence
- Connect VAS 5051 tester or VAG 1551 scan
tool and select control module for engine
electronics using "address word" 01. Engine
must run at idle for this.
Repair Manual, 2.7 Liter V6 5V BiTurbo Fuel
Injection & Ignition, Engine Code(s): APB, Repair Group 01
Rapid data transfer
HELP
Select Function XX
When indicated on display
- Press buttons -0- and -8- to select "Read Measuring Value Block" and
press -Q- button to confirm input.
Read measurin
g value block
Q
Input display group number XXX
When indicated on display
- Press buttons -1-, -1- and -2- to select "display group number 112" and
press -Q- button to confirm input.
Read measuring value block 112
1
2
3
4
Indicated on display (1...4 display fields) - Check exhaust gas temperature.
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26-25
Checking voltage supply
- Switch ignition off.
- Remove engine cover (arrows).
- Disconnect connector at exhaust gas temperature sensor.
- Connect VAG 1527B voltage tester as follows:Harness connector terminal
Measure to
3 Engine Ground (GND)
- Operate starter briefly.
LED must light.
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26-26
If LED does not light:
- Perform following tests marked with dots:
Electrical Wiring Diagrams, Troubleshooting & Component Locations
Repair Manual, 2.7 Liter V6 5V BiTurbo Fuel Injection & Ignition,
Engine Code(s): APB, Repair Group 24
Repair Manual, 2.7 Liter V6 5V BiTurbo Fuel Injection & Ignition,
Engine Code(s): APB, Repair Group 24
Check fuse -S234- (in fuse holder, position 34). Check wire connection from exhaust gas temperature sensor via fuse
-S234- (in fuse holder, socket 34) to Fuel Pump (FP) relay for open
circuit: Check Fuel Pump (FP) relay.
- Connect VAG 1598/31 test box at wiring harness to ECM. Do not
connect ECM.
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26-27
If wire connection is OK:
If the same malfunction occurs again after replacing the exhaust gas
temperature sensor:
Repair Manual, 2.7 Liter V6 5V BiTurbo Fuel Injection & Ignition, Engine Code(s): APB, Repair Group 24
- Check following wire connections for open circuit and short circuit to
Ground (GND) and B+:
Harness connector terminal
VAG 1598/31 test box
Bushing
1 (Bank 1) 61
1 (Bank 2) 20
2 50
- Replace exhaust gas temperature sensor.
- Replace Engine Control Module (ECM).
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