2003 FORD MUSTANG Workshop Manual

reset infotainment system coolant capacity key engine coolant winter tyres tire pressure reset

Page 3873 of 4378

FORD MUSTANG 2003 Workshop Manual Pinpoint Tests
CAUTION: Before removing and installing the GEM or its connectors, disconnect the
battery. Failure to follow this caution will result in the GEM storing many erroneous DTCs and it
m

Pinpoint Tests
CAUTION: Before removing and installing the GEM or its connectors, disconnect the
battery. Failure to follow this caution will result in the GEM storing many erroneous DTCs and it
may exhibit erratic operation after installation.
CAUTION: Be careful when probing the central junction box (CJB), battery junction box
(BJB) or any connectors. Damage will result to the connector receptacle if the probe being
used is too large.
CAUTION: Electronic modules are sensitive to static electrical charges. If exposed to
these charges, damage may result.
NOTE: If continuous DTCs are recorded and the symptom is not present when carrying out the
pinpoint tests, an intermittent concern may be the cause. Always check for loose connections and
corroded terminals.
NOTE: Complete the entire pinpoint test related to the symptom before installing a new GEM.
PINPOINT TEST A: NO COMMUNICATION WITH THE GENERIC
ELECTRONIC MODULE (GEM) Test Step Result / Action to Take
CAUTION: Use the correct probe adapter(s) when making measurements. Failure to
use the correct probe adapter(s) may damage the connector. A1 CHECK THE GENERIC ELECTRONIC MODULE (GEM)
POWER SUPPLY z
Key in OFF position.
z Disconnect: Generic Electronic Module (GEM) C201a.
z Disconnect: GEM C201b.
z Key in ON position.
z Using the following table. measure the voltage between the
GEM, harness side and ground.
z Are the voltages greater than 10 volts? Connector Pin Circuit
C201a 4 400 (LB/BK)
C201a 1 1006 (DG/WH)
C201b 2 1001 (WH/YE)
C201b 3 193 (YE/LG) Yes
GO to
A2 .
No
REPAIR the circuit(s) in
question. TEST the system
for normal operation. A2 CHECK THE GEM GROUND CIRCUIT 397 (BK/WH) FOR
OPEN z
Key in OFF position.
z Measure the resistance between the GEM C201b pin 4,
circuit 397 (BK/WH), harness side and ground. Yes
GO to
A3 .
No
REPAIR the cirucit(s) in
question. TEST the system Klj . 6 ba
202003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

Page 3874 of 4378

FORD MUSTANG 2003 Workshop Manual PINPOINT TEST B: WINDSHIELD WIPERS DO NOT OPERATE /
OPERATE CORRECTLY �z
Is the resistance less than 5 ohms? for normal operation.
A3 CHECK CIRCUIT 397 (BK/WH) FOR SHORT TO POWER
�z
Measure the v

Page 3875 of 4378

FORD MUSTANG 2003 Workshop Manual No
GO to
B10 .
B4 TEST THE GEM CONTROL OF WIPER HIGH/LOW RELAY
�z
Trigger the GEM active command WIPER RLY to ON.
�z Trigger the GEM active command SPEED RLY ON and
OFF.
�z Does wiper speed ch

Page 3876 of 4378

FORD MUSTANG 2003 Workshop Manual (LB/OG) FOR SHORT TO GROUND BETWEEN THE GEM AND
THE MULTIFUNCTION SWITCH
�z
Key in OFF position.
�z Using the following table, measure the resistance between
the GEM C201e Pins, harness side and g

Page 3877 of 4378

FORD MUSTANG 2003 Workshop Manual relay Pin 5, Circuit 65 (DG), harness side and ground; and
between BJB wiper ON/OFF relay Pin 2, Circuit 65 (DG),
harness side and ground.
�z Are the voltages greater than 10 volts? REPAIR circuit

Page 3878 of 4378

FORD MUSTANG 2003 Workshop Manual �z
Is the voltage greater than 10 volts? B14 CHECK CIRCUIT 646 (YE/WH) FOR SHORT TO
GROUND BETWEEN GEM AND BJB �z
Measure the resistance between GEM C201d Pin 12,
Circuit 646 (YE/WH), harness side

Page 3879 of 4378

FORD MUSTANG 2003 Workshop Manual �z
Connect a fused jumper wire (30A) between wiper
HIGH/LOW relay Pin 30, Circuit 61 (YE/RD), harness side
and Pin 87, Circuit 58 (WH), harness side.
�z Did the wiper motor speed increase with the

Page 3880 of 4378

FORD MUSTANG 2003 Workshop Manual �z
Is the resistance greater than 10,000 ohms? B21 CHECK CIRCUIT 647 (GY/LB) FOR OPEN CONDITION
BETWEEN GEM AND BJB �z
Measure the resistance between GEM C201d Pin 5,
Circuit 647 (GY/LB), harness

Load next 8 pages

Page: < prev 1-10 ... 3841-3848 3849-3856 3857-3864 3865-3872 3873-3880 3881-3888 3889-3896 3897-3904 3905-3912 ... 4384 next >

tyre pressure TPMS wiper size fuel additives maintenance dashboard