Page 1697 of 2490
It
em
Par
t Number
De
scription
1—Engine
management ECM
2—Boot fuse box
3—Fue
l pumps
Ci
rcuit Diagram, Fuel Pump
- Supercharged Vehicles
Page 1698 of 2490

Fuel Tank and Lines - Fuel Tank and Li
nes
D
iagn
osis and Testing
Sym
p
tom Chart
Sy
m
ptom Chart
Pinpoint test A: P1230
S
p
ecial Tool(s)
D
i
gital multimeter
Generi
c scan tool
F
u
el tank sender (sensor) unit wrench
18G 1001
Sy m
ptom
Possib
l
e Sources
Acti
o
n
D
T
C P1230 Fuel pump relay
malfunction
Re lay
failure
Harness fault
Connector loose or corroded
Connector pins(s) bent or tracking between connections
Ground failure
*
*
*
*
*
GO to Pinpoint
Test A
*
D
T
C P1646 Secondary fuel pump
relay malfunction
Re lay
failure
Harness fault
Connector loose or corroded
Connector pins(s) bent or tracking between connections
Ground failure
*
*
*
*
*
GO to Pinpoint
Test B
*
D
T
C P0460 Fuel level sensor circuit
malfunction
Worn
or damaged sensor tracks
Harness fault
Connector loose or corroded
Connector pin/s bent or tracking between connections
Fuel level sensor to instrument pack circui ts intermittent short
or open circuit or high resistance. Fuel level sensor failure
Instrument pack fault (inc orrect fuel level data)
*
*
*
*
*
*
*
GO to Pinpoint
Test C
*
P
INPOINT TES
T A : A: P1230
T
E
ST CONDITIONS
D
E
TAILS/RESULTS/ACTIONS
A1
: RETRIEV
E DTCS
•
NOTE
: Battery and or ECM disconnection prior to scanning wi
ll erase all data, ensure that the correct DTC is present.
Page 1699 of 2490
Conne
ct the scan tool
1
Have the DTC(s) and fr
eeze
frame data been recorded?
Yes GO to A2
A2
: CHECK FUSE
•
NOTE: See further steps for poss
ible cause of fuse failure.
Chec
k fuse F7 integrity (located in the trunk).
1
OK
?
Yes GO to A3
No Renew fuse and test the syst em for normal operation.
A3:
CHECK SHORT TO SUPPLY
Page 1700 of 2490
Wi
th EM013 disconnected, check for battery voltage
between EM013/001 and ground BT020L.
1
B+ ?
Yes
GO t
o A13
No GO to A4
A4: CHECK
SUPPLY VOLTAGE
•
NOTE: Do not replace relay.
Page 1701 of 2490
W
ith relay 4 removed, check for battery voltage at relay
socket between pins 3 and 5.
1
B+
Yes GO to A5
No GO to A11
A5
: CHECK CIRCUIT CONTINUITY
•
NOTE: Do not replace relay.
Page 1702 of 2490
Measure t
he resistance between relay socket pin 5 and
ground BT020L.
1
I s
the resistance < 10OHM?
Yes GO to A6
No GO to A10
A6: CHECK FUEL
PUMP DRAWN CURRENT
•
NOTE
: With EM013 disconnected this test will cause the pump to operate continuously. Do not exceed 10 sec running.
•
NOTE: Do not replace relay.
Page 1703 of 2490
Wi
th the ignition energized, measure the current drawn
between relay socket pins 3 and 5.
1
Is
the current between 2.5 and 9 A?
Yes GO to A7
No GO to A10
A7
: CHECK B+ AT RELAY COIL
•
NOTE: Do not replace relay.
Page 1704 of 2490
Us
ing a link lead, connect EM013/001 to ground BT020L.
1
W
i
th ignition energized, check for battery voltage at relay
socket between pins 2 and 1.
2
B+?
Yes
GO t
o A10
No GO to A8
A8: CH
ECK RELAY COIL
CIRCUIT CONTINUITY