Page 57 of 81
24-51
Checking Injection Quantity
- Insert fuel injector to be tested in a measuring
glass from VAG1602 injection quantity test
device.
- Connect one terminal of fuel injector to engine Ground (GND) using an
adapter cable and an alligator clip from VAG1594A connector test kit.
- Connect second terminal of fuel injector to B+ using VAG1348/3A
remote control, VAG1348/3-2 adapter cable and assisting cable.
- Bridge terminals 1 and 65 at test box using wires from VAG1594A
adapter test kit.
- Bridge terminals 1 and 65 at test box using wires from VAG1594A
adapter test kit.
- Switch ignition on.
Fuel Pump (FP) must run.
- Activate VAG1348/3A remote control for 30 seconds.
- Perform measurement on all fuel injectors.
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Page 58 of 81
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- After all four fuel injectors have been activated,
place measuring glasses on an even surface.
Specified value for each fuel injector: 135
10 ml
- If measured value of one or more fuel injectors
is outside of specified range, switch Fuel Pump
(FP) off (switch ignition off) and replace faulty
fuel injector Page 24
-46
.
- If measured values of all fuel injectors are
outside specified range, check fuel pressure
Page 24
-33
.
Note:
Also check spray pattern when checking injection
quantity. Spray pattern must be the same for all
injectors
- Install fuel injectors together with fuel distributor
Page 24
-47
.
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Page 59 of 81
24-53
Fuel Pump (FP) relay -J17- and activation,
checking
Special tools and equipment
VAG1526A
VAG1594A
VAG1598/31
VAS5051 with VAG5051/1
- or
VAG1551 with VAG1551/3A
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Page 60 of 81
24-54
Component location Overview of component
locations Page 24
-5 .
Voltage is supplied to the Fuel Pump (FP) and
several components of the injection system via
the Fuel Pump (FP) relay -J17-.
Engine must be turning for Fuel Pump (FP) relay
-J17- to close. This means that the relay does
not receive Ground (GND) (via ECM) until the
ECM recognizes RPM signals.
Test requirement:
Battery voltage at least 12.7 V
Function test of Fuel Pump (FP) relay
- Remove driver-side storage compartment.
Repair Manual, Body Interior, Repair Group
68
- Connect VAS5051 tester or VAG1551 scan tool
and select control module for engine electronics
using "address word" 01 Page 01
-10
. Ignition
must remain switched on.
-
Initiate output Diagnostic Test Mode (DTM)
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Page 61 of 81
Page 01
-49
and activate Evaporative Emission
(EVAP) canister purge regulator valve -N80-.
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Page 62 of 81
24-55
A - If relay does not trigger:
B - If relay triggers, but Fuel Pump (FP) does not run:
Check voltage supply of Fuel Pump (FP) relay
Fuel Pump (FP) relay (at position 4 of central electrics in driver's
footwell, left) must trigger and Fuel Pump (FP) must run.
- Check voltage supply of Fuel Pump (FP) relay Page 24
-55
.
- Checking activation of Fuel Pump (FP) relay Page 24
-56
.
- Check voltage supply for Fuel Pump (FP) and components (via Fuel
Pump -FP- relay) Page 24
-58
.
- Remove Fuel Pump (FP) relay.
- Connect multimeter to terminal 17 of relay socket and Ground (GND)
for voltage measurement.
Specification: approx. battery voltage
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Page 63 of 81
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If specified value is not obtained:
- Replace central electrics.
Checking activation of Fuel Pump (FP) relay
- Switch ignition off.
- Connect VAG1598/31 test box at wiring harness
to Engine Control Module (ECM), do not connect
ECM Page 24
-19
.
- Switch ignition on.
- Bridge terminals 1 and 65 at test box using wires
from VAG1594A adapter test kit.
If relay triggers now, but didn't during output DTM:
If relay does not trigger:
Fuel Pump (FP) relay (at position 4 of central electrics in driver's
footwell, left) must trigger.
- Replace Engine Control Module (ECM) Page 24
-23
- Switch ignition off.
- Remove cable bridge.
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Page 64 of 81
- Remove Fuel Pump (FP) relay.
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