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303-06-14 303-06-14Starting System
DIAGNOSIS AND TESTING (Continued)
Possible Causes
For manual transmission equipped vehicles, voltage
from the SJB is supplied to the clutch pedal position
• Fuse(s)
switch (CPP) through circuit 32 (RD/LB). When the
• Circuit 2037 (RD)
clutch pedal is depressed, voltage is supplied from
• Ground circuit
the CPP to the starter relay coil located in the BEC
through circuit 32 (RD/LB). The starter relay coil is
• Starter motor
supplied ground from the PCM through circuit 1419
(LG/YE).
When the starter relay is energized, voltage supplied
to the relay switch is sent to the starter motor
solenoid through circuit 113 (YE/LB). Battery
voltage is supplied to the starter motor through
circuit 2037 (RD) at all times.
PINPOINT TEST C: THE ENGINE CRANKS SLOWLY
Test Step Result / Action to Take
C1 CHECK THE VOLTAGE TO THE STARTER
• Key in OFF position.
• Measure the voltage between starter motor solenoid positive
terminal and ground.
Yes
GO to C2.
No
REPAIR circuit 2037 (RD). CLEAN and
TIGHTEN the connections at the battery
terminals. TEST the system for normal
• Is the voltage 12.5 volts or greater? operation.
C2 CHECK MOTOR GROUND CIRCUIT
• Carry out the Motor Ground Circuit test. Refer to Component
Yes
Tests in this section. INSTALL a new starter motor. TEST the
• Is the ground OK? system for normal operation.
No
REPAIR the ground circuit as necessary.
TEST the system for normal operation.
Pinpoint Test D: Unusual Starter Noise
For automatic transmission equipped vehicles,
voltage is supplied from the SJB to the digital
Normal Operation
transmission range (TR) sensor through circuit 32
In normal operation, voltage from the bussed
(RD/LB). In PARK or NEUTRAL, voltage is
electrical center (BEC) is supplied to the ignition
supplied from the TR sensor through circuit 33
switch through circuit 1050 (LG/PK). When the
(WH/PK) to the starter relay coil located in the
ignition switch is placed in the START position,
BEC. The starter relay coil is supplied ground from
voltage is supplied through circuit 1522 (DG) to the
the PCM through circuit 1419 (LG/YE).
smart junction box (SJB).
2005 Mustang, 12/2004