Subject:
Brief Checking Procedures for Auxiliary Heaters Not Capable
of Diagnosis
Vehicles:
Vectra - B with X 20 DTL engine (as of MY
`97)
Condition:
An auxiliary heater is available as optional equipment in
conjunction with the X 20 DTL engine (as of MY `97.5 with
self - diagnosis). Systems not capable of self - diagnosis are
identified by a yellow mark. As of chassis no. 36V1 10491 1, the
auxiliary heater is fastened by two screws instead of just one at the rear of
the bracket.
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Remedy:
This Technical Information Bulletin includes the block
diagram, a function description and an electronic function check with brief
checking procedures. Trouble - shooting for the module with self -
diagnosis shall be described in appropriate Checking Procedures when `. he
system is introduced.
Block Diagram:
61 Alternator G2, terminal 61 (alternator running)
31 Terminal 31, ground
30 Terminal 30, battery positive
15 Terminal 15, ignition ON
E42 Auxiliary heater (coolant heating)
S69 Heating intake air temperature switch
M69 Dosing pump (fuel dosing pump)
X13 Diagnostic plug, 16 - pin (in system without
self - diagnosis, not connected in wiring harness)
Note: The digits within E42 indicate the connections
of the 8 - pin auxiliary heater plug.
Function:
The auxiliary heater is based on the fuel - fired
parking heating system. It is connected to the heating circuit and serves to
accelerate heating of the coolant at low ambient temperatures. In the event
of extreme cold, the interior warms up more quickly, ensuring that the
windscreen area defrosts more rapidly.
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Test Conditions:
· Coolant
temperature lower than 75 °C / 167 °F (measured inside the
auxiliary heater)
· Ambient
temperature lower than 5 °C / 41 °F (if ambient temperature is
higher than 5 °C / 41 °F, the temperature switch must be bridged
or brought down to below 5 °C / 41 °F with cold spray)
· Exhaust suction
equipment required
Function Check:
· Inspect electric
cable connection.
· Ignition ON,
start engine:
Auxiliary heater attempts to start within 270 sec.,
dosing pump pulses after 45 seconds, manual test is possible.
· If auxiliary
heater does not activate, ignition OFF and ON again:
The auxiliary heater makes a further two attempts to
start automatically.
· The function of
the auxiliary heater cannot be tested when the coolant temperature is higher
than 75 °C / 167 °F.
A, Brief checking procedures for auxiliary heaters
not capable of diagnosis
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Test
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Work order description
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Nominal value
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T01
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Function check
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· Function check
of auxiliary heater according to specified test conditions
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No function
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Yes T02
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No E01
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T02
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Introductory inspection
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· Check battery
condition
· Check fuses F28
and F38
· Check all
wiring harness plugs and system unit plugs
· Check fastening
of grounding point 1
· Check fuel and
coolant lines for leaks
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All components OK
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Yes T03
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No E02
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T03
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Check voltage supply for auxiliary heater
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· Detach 8 -
pin auxiliary heater plug
· Measure voltage
between following terminals:
8 - pin auxiliary heater plug, terminal 1
and
ground
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greater than 10 V
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Yes T04
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No E03
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T04
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Check voltage supply for auxiliary heater
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· Detach 8 -
pin auxiliary heater plug
· Measure voltage
between following terminals:
8 - pin auxiliary heater plug, terminal 2
and
ground
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less than 0.1 V
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Yes T05
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No E04
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T05
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Check voltage supply for auxiliary heater
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· Detach 8 -
pin auxiliary heater plug
· Detach 2 -
pin temperature switch plug (S69) from microfilter and bridge
· Ignition ON
· Measure voltage
between following terminals:
8 - pin auxiliary heater plug, terminal 6
and
ground
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greater than 10 V
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T06
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Check voltage supply for auxiliary heater
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· Detach 8 -
pin auxiliary heater plug
· Measure voltage
between following terminals:
8 - pin auxiliary heater plug, terminal 7
and
ground
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less than 0.1 V
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· Start engine
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greater than 10 V
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Yes: T07
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No: E06
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T07
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Check voltage supply for auxiliary heater
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RHD vehicles only:
· Detach
auxiliary heater bracket from bulkhead (3 nuts - M6)
· Unscrew dosing
pump from auxiliary heater bracket (1 bolt - M6)
· Disconnect fuel
hose between dosing pump and auxiliary pump at auxiliary pump (1 clamp)
· Detach exhaust
line from auxiliary heater
· Detach 2 -
pin dosing pump plug and 8 - pin auxiliary heater plug
· Remove dosing
pump upwards
All vehicles:
· Detach 2 -
pin dosing pump plug
· Connect one
connection of dosing pump to battery positive terminal using corresponding
adapter cable from the Electronic - Kit Dosing pump
· Pulse the other
dosing pump connection to the battery operates audibly negative terminal using
corresponding adapter cable at regular, brief intervals
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Yes E07
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No: E48
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Result
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Cause of fault
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E01
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· Auxiliary
heater system operating without fault
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E02
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· Fuse F28 or F38
defective
or
· Battery voltage
too low
or
· Grounding point
fastening inadequate
or
· Fuel or coolant
lines leaky
- Replace relevant fuse after eliminating the cause of
it blowing
- Charge battery
- Fasten grounding point 1 correctly
- Eliminate leak
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E03
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· Circuit
interruption between:
Fuse F28
and
8 - pin auxiliary heater plug, terminal 1, red cable
(1.5 mm2)
- Eliminate interruption in circuit
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E04
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· Circuit
interruption between:
8 - pin auxiliary heater plug, terminal 2
and
ground, brown cable (1.5 mm²)
- Eliminate interruption in circuit
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E05
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· Circuit
interruption between:
8 - pin auxiliary heater plug, terminal 6
and
2 - pin heating intake air temperature switch plug
(S69),
black / white cable (0.5 mm²)
or
· Circuit
interruption between
2 - pin heating intake air temperature switch plug
(S69)
and
fuse F38, black cable (0.5 mm²)
- Eliminate interruption in circuit
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E06
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· Circuit
interruption between:
8 - pin auxiliary heater plug, terminal 7
and
alternator, terminal 61, blue / white cable
(0.5 mm²)
- Eliminate interruption in circuit
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E07
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· Auxiliary
heater defective
- Replace auxiliary heater
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E08
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· Dosing pump
defective
- Replace dosing pump
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Parts:
Designation
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Part no.
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Catalogue no.
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Auxiliary Heater, not capable of diagnosis
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90 508 550
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18 26 008
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(LHD and RHD identical)
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Dosing Pump
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90 508 548
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18 26 005
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Auxiliary Heater Bracket, LHD
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90 508 552
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18 26 006
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Auxiliary Heater Bracket, RHD
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90 508 559
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18 26 007
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Time Allowance:
Op. no.
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Operation
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hrs
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J 4988 00
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Quick Check Auxiliary Heater (Coolant)
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. 2
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TC: 99
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Add:
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001
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Check dosing pump
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LHD
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RHD
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W 1000 00
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Vehicle from Parkina Place to Workplace and Back
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. 2
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TC: 99
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The regular warranty procedure should be used for claiming
set - up time.