Instrument Cluster Dtcs; Smart Junction Box (Sjb) Dtcs; Pcm Dtcs - Ford Mustang 2005 Workshop Manual

2005 Mustang Workshop Manual
Instrument Cluster Connector-Pin
C220-3
C220-25
C220-26
Are the voltages greater than 10 volts?
A2 CHECK THE INSTRUMENT CLUSTER GROUND CIRCUIT
Ignition OFF.
Measure the resistance between the instrument cluster C220-2, circuit 1205 (BK) harness side and
ground.
Is the resistance less than 5 ohms?
Pinpoint Test B: Incorrect Fuel Gauge Indication
Normal Operation
NOTE: The fuel pump module may also be called the fuel tank unit.
NOTE: The fuel level sensor may also be called the fuel sender.
The fuel tank is a saddle tank design with variable resistance senders in each side of the tank. The fuel pump module (LH side) and the fuel level sensor (RH side) are driven by floats that
provide resistances related to the fuel level on each side of the tank to the smart junction box (SJB). The fuel pump module and the fuel level sensor uses an approximate resistance
range between 15 ohms ± 2 ohms at empty (E) and 160 ohms ± 4 ohms at full (F). The fuel pump module is hardwired to the SJB through the signal circuit 1356 (LG/VT) and the return
circuit 1357 (LB/YE). The fuel level sensor is hardwired to the SJB through the signal circuit 29 (YE/WH) and the return circuit 1357 (LB/YE). The SJB monitors the resistance readings
that are sent to the SJB from the fuel pump module and the remote fuel sender and sends the instrument cluster a message over the communication network to command the fuel gauge
with a corresponding movement of the pointer. If the fuel level sensor is open, the fuel gauge defaults to the fuel pump module value only and the fuel gauge indicates E to 1/2 tank. If the
fuel pump module is open, the fuel gauge defaults to the empty position.

Instrument Cluster DTCs

DTC Description
B1202 — Fuel Sender Circuit Open (LH Side)
B1204 — Fuel Sender Circuit Short To Ground (LH Side)
B2627 — Fuel Sender Circuit Open #2 (RH Side)
B2628 — Fuel Sender Circuit Short To Ground #2 (RH Side)
NOTE: Normal operation of the fuel delivery system allows the fuel
level sensor side of the fuel tank (the side opposite the fuel filler hose
inlet) to have less fuel than the fuel pump module side of the tank (the
side with the fuel filler hose inlet).
B2879 — Fuel Tank Jet Pump Fault

Smart Junction Box (SJB) DTCs

DTC Description
B1201 — Fuel Sender Circuit Failure (LH Side)
B1202 — Fuel Sender Circuit Open (LH Side)
B2627 — Fuel Sender Circuit Open #2 (RH
Side)
B2628 — Fuel Sender Circuit Short To Ground
#2 (RH Side)

PCM DTCs

DTC Description
P0460 — Fuel Level Sensor A Circuit (LH
Side)
P0461 — Fuel Level Sensor A Circuit
Range/Performance (LH Side)
P0462 — Fuel Level Sensor A Circuit Low (LH
Side)
http://www.fordtechservice.dealerconnection.com/pubs/content/...
Circuit
1001 (WH/YE)
1266 (RD/YE)
489 (PK/BK)
A continuous DTC set in the instrument cluster if the message from the SJB indicates an open or short to
voltage on the input from circuits 1356 (LG/VT) or 1357 (LB/YE) for 33 seconds.
A continuous DTC set in the instrument cluster if the message from the SJB indicates a short to ground on the
input from circuit 1356 (LG/VT) or if circuit 1356 (LG/VT) is shorted to circuit 1357 (LB/YE) for 33 seconds.
A continuous DTC set in the instrument cluster if the message from the SJB indicates an open or short to
voltage on the input from circuits 29 (YE/WH) or 1357 (LB/YE).
A continuous DTC set in the instrument cluster if the message from the SJB indicates a short to ground on the
input from circuit 29 (YE/WH) or if circuit 29 (YE/WH) is shorted to circuit 1357 (LB/YE).
A continuous DTC set in the instrument cluster if the fuel level message from the SJB indicates a large
discrepancy in the amount of fuel between the fuel pump module and the fuel level sensor sides of the tank. The
fuel level in the fuel level sensor side of the tank (the side opposite the fuel filler hose inlet) has significantly
more fuel than the fuel pump module side of the tank (the side with the fuel filler hose inlet).
Sets in the SJB on-demand if the SJB detects a short to ground on the input from circuit 1356 (LG/VT) or if circuit 1356 (LG/VT)
is shorted to circuit 1357 (LB/YE).
Sets in the SJB on-demand if the SJB detects an open or short to voltage on the input from circuits 1356 (LG/VT) or 1357
(LB/YE).
Sets in the SJB on-demand if the SJB detects an open or short to voltage on the input from circuits 29 (YE/WH) or 1357
(LB/YE).
Sets in the SJB on-demand if the SJB detects a short to ground on the input from circuit 29 (YE/WH) or if circuit 29 (YE/WH) is
shorted to circuit 1357 (LB/YE).
Sets when the PCM determines the value of the fuel pump module signal is stuck, that the fuel level input signal does not change
or does not correspond with the calculated fuel usage.
Sets when the PCM determines the fuel pump module signal repeatedly moves in and out of range, exceeding the minimum or
maximum allowable calibrated parameters for a specified fuel fill percentage in the fuel tank.
Sets in the PCM when the PCM detects a short to ground on the fuel pump module signal circuit based on the messaged input
received from the instrument cluster.
self-test.
Yes
REFER to Section 418-00 to continue communication diagnosis.
No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
Fault Trigger Conditions
Fault Trigger Conditions
Fault Trigger Conditions
Page 13 of 40
11/14/2009