Starting System: Other — Ford Mustang V (2004-2009)

Possible Causes

Fuse(s)
An open in battery voltage feed BEC, 2037 (RD) or 113 (YE/LB)
Starter motor relay
Starter

Scheme 6

Scheme 6: PINPOINT TEST A: THE ENGINE DOES NOT CRANK AND THE RELAY DOES NOT CLICK

Scheme 7

Scheme 8

Scheme 9

Scheme 10

Scheme 11

Scheme 12

Scheme 13

Scheme 14

A1 CHECK THE BATTERY Check the battery condition and charge if necessary. Refer to «BATTERY, MOUNTING AND CABLES»(ref-256496). Is the battery OK? Yes: GO to A2. No: CHARGE or INSTALL a new battery as necessary. REFER to «BATTERY, MOUNTING AND CABLES»(ref-256496). TEST the system for normal operation.
A2 CHECK FOR PATS DTCS NOTE: The PATS DTCs are the only DTCs of concern in this step. Only repair retrieved non-PATS DTCs if a customer concern is reported. Check for PATS DTCs. Were any PATS DTCs retrieved? Yes: GO to «ANTI-THEFT - PATS»(ref-256508) to diagnose the PATS DTCs. No: GO to A3.
A3 CHECK CIRCUIT 33 (WH/PK) (CIRCUIT 32 [RD/LB] MANUAL TRANSMISSION ONLY) FOR VOLTAGE Disconnect: Starter Motor Relay. Key in START position. If equipped, fully depress the clutch pedal. Measure the voltage between starter motor relay C1017-85, circuit 33 (WH/PK) (circuit 32 [RD/LB] manual transmission only) and ground while holding the key in the START position and with the clutch pedal, if equipped, fully depressed. see scheme 1: Checking Circuit 33 (WH/PK) (Circuit 32 [RD/LB] Manual Transmission Only) For Voltage Is the voltage greater than 10 volts? Yes: GO to A12. No: Vehicles equipped with an automatic transmission, GO to A4. Vehicles equipped with a manual transmission, GO to A7.
A4 CHECK CIRCUIT 32 (RD/LB) FOR VOLTAGE AT THE DIGITAL TR SENSOR (AUTOMATIC TRANSMISSION ONLY) Key in OFF position. Disconnect: Digital TR Sensor C167. Key in START position. Measure the voltage between digital TR sensor C167-1C, circuit 32 (RD/LB) and ground while holding the key in the START position. (Scheme 6): Checking Circuit 32 (RD/LB) For Voltage At Digital TR Sensor (Automatic Transmission Only) Is the voltage greater than 10 volts? Yes: GO to A5. No: GO to A8.
A5 CHECK CIRCUIT 33 (WH/PK) FOR AN OPEN Key in OFF position. Measure the resistance between digital TR sensor C167-12, circuit 33 (WH/PK) and starter motor relay C1017-85, circuit 33 (WH/PK). (Scheme 7): Checking Circuit 33 (WH/PK) For Open Is the resistance less than 5 ohms? Yes: GO to A6. No: REPAIR circuit 33 (WH/PK). TEST the system for normal operation.
A6 CHECK DIGITAL TR SENSOR ADJUSTMENT Carry out the digital TR sensor adjustment. Refer to «AUTOMATIC TRANSAXLE/TRANSMISSION»(ref-256467). Is the digital TR sensor adjusted correctly? Yes: INSTALL a new digital TR sensor. TEST the system for normal operation. No: ADJUST the digital TR sensor as necessary. TEST the system for normal operation.
A7 CHECK CIRCUIT 32 (RD/LB) FOR VOLTAGE AT THE CLUTCH PEDAL POSITION (CPP) SWITCH Key in OFF position. Disconnect: CPP Switch C257. Key in START position. Measure the voltage between CPP switch C257-1, circuit 32 (RD/LB) and ground while holding the key in the START position. (Scheme 8): Checking Circuit 32 (RD/LB) For Voltage Clutch Pedal Position (CPP) Switch Is the voltage greater than 10 volts? Yes: GO to A11. No: GO to A8.
A8 CHECK CIRCUIT 1522 (DG) FOR AN OPEN Key in OFF position. Disconnect: SJB Fuse 21. Key in START position. Measure the voltage between SJB fuse 21, circuit 1522 (DG) and ground while holding the key in the START position. (Scheme 9): Checking Circuit 1522 (DG) For Open Is the voltage greater than 10 volts? Yes: REPAIR circuit 32 (RD/LB). TEST the system for normal operation. No: GO to A9.
A9 CHECK CIRCUIT 1050 (LG/PK) FOR VOLTAGE Key in OFF position. Disconnect: Ignition Switch C250. Measure the voltage between ignition switch C250-4, circuit 1050 (LG/PK) and ground. (Scheme 10): Checking Circuit 1050 (LG/PK) For Voltage Is the voltage greater than 10 volts? Yes: GO to A10. No: REPAIR circuit 1050 (LG/PK). TEST the system for normal operation.
A10 CHECK CIRCUIT 1522 (DG) FOR AN OPEN Measure the resistance between ignition switch C250-7, circuit 1522 (DG) and SJB fuse 21. Is the resistance less than 5 ohms? Yes: INSTALL a new ignition switch. REFER to «STEERING COLUMN SWITCHES»(ref-256498). TEST the system for normal operation. No: REPAIR circuit 1522 (DG). TEST the system for normal operation.
A11 CHECK CIRCUIT 32 (RD/LB) FOR AN OPEN Key in OFF position. Measure the resistance between CPP switch C257-2, circuit 32 (RD/LB) and starter motor relay C1017-85, circuit 32 (RD/LB). (Scheme 11): Checking Circuit 32 (RD/LB) For Open Is the resistance less than 5 ohms? Yes: INSTALL a new CPP switch. REFER to «ELECTRONIC ENGINE CONTROLS»(ref-256463). TEST the system for normal operation. No: REPAIR circuit 32 (RD/LB). TEST the system for normal operation.
A12 CHECK THE STARTER MOTOR RELAY GROUND CIRCUIT FOR AN OPEN Key in START position. Measure the voltage between starter motor relay C1017-86, circuit 1419 (LG/YE) and starter motor relay C1017-85, circuit 33 (WH/PK) (circuit 32 [RD/LB] manual transmission only) while holding the key in the START position and clutch pedal, if equipped, fully depressed. (Scheme 12): Checking Starter Motor Relay Ground Circuit For Open Is the voltage greater than 10 volts? Yes: INSTALL a new starter motor relay. TEST the system for normal operation. No: GO to A13.
A13 CHECK CIRCUIT 1419 (LG/YE) FOR AN OPEN Key in OFF position. Disconnect: PCM C175B. Measure the resistance between PCM C175B-2, circuit 1419 (LG/YE) and starter relay C1017-86, circuit 1419 (LG/YE). (Scheme 13): Checking Circuit 1419 (LG/YE) For Open Is the resistance less than 5 ohms? Yes: INSTALL a new PCM. REFER to «ELECTRONIC ENGINE CONTROLS»(ref-256463). TEST the system for normal operation. No: REPAIR circuit 1419 (LG/YE). TEST the system for normal operation.

Fuse(s)
An open in circuit 1050 (LG/PK), 1522 (DG), 32 (RD/LB), 33 (WH/PK) or 1419 (LG/YE)
Powertrain control module (PCM)
Digital transmission range (TR) switch
Ignition switch
Starter motor relay
Clutch pedal position (CPP) switch

Scheme 15

Scheme 15: PINPOINT TEST B: THE ENGINE DOES NOT CRANK AND THE RELAY DOES CLICK

Scheme 16

Scheme 17

B1 CHECK THE VOLTAGE TO THE STARTER RELAY Measure the voltage between starter relay C1017-30 and ground. (Scheme 14): Checking Voltage To Starter Relay Is the voltage greater than 10 volts? Yes: GO to B2. No: INSTALL a new bussed electrical center (BEC). TEST the system for normal operation.
B2 CHECK THE VOLTAGE TO THE STARTER MOTOR SOLENOID Measure the voltage between starter motor solenoid positive terminal and ground. (Scheme 15): Checking Voltage To Starter Motor Solenoid Is the voltage 10 volts or greater? Yes: GO to B3. No: REPAIR circuit 2037 (RD) for an open. TEST the system for normal operation.
B3 MANUALLY JUMP THE STARTER MOTOR Connect one end of a fused (15A) jumper wire to the positive terminal of the battery and touch the other end to the starter solenoid S-terminal. (Scheme 16): Supplying Battery Voltage Using Fused Jumper Wire Does the starter solenoid engage? Yes: GO to B4. No: INSTALL a new starter motor. REFER to «STARTER MOTOR - 4.0L SOHC»(ref-256459-S06739860992007061500000) or «STARTER MOTOR - 4.6L (3V)»(ref-256459-S22606761852007061500000) in this article. TEST the system for normal operation.
B4 TEST THE STARTER MOTOR RELAY Carry out the relay component test on the starter motor relay. Refer to «COMPONENT TESTING»(ref-252574) for component testing. Does the starter motor relay test good? Yes: REPAIR circuit 113 (YE/LB) for an open. TEST the system for normal operation. No: INSTALL a new starter motor relay. TEST the system for normal operation.

Fuse(s)
Circuit 2037 (RD)
Ground circuit
Starter motor

Starter motor mounting
Starter motor mounting bolts
Starter motor drive
Flywheel or flexplate ring gear
Starter motor

Starter Motor - Voltage Drop Tests

The following test procedures will be carried out with the starter motor on the vehicle.

Starter Motor - Motor Feed Circuit

Note. Make all multimeter connections at the component terminal rather than the cable or wiring terminal.

Disconnect the ignition coil connector from the ignition coil.
Connect a remote starter switch between the starter solenoid S-terminal and the battery positive (+) post.
Connect the positive (+) lead of the 73 Digital Multimeter to the battery positive (+) post. Connect the negative (-) lead of the multimeter to the starter solenoid M-terminal.
Engage the remote starter switch. The multimeter reading should be 0.5 volt or less.
If the voltage at the M-terminal is greater than 0.5 volt, move the multimeter negative (-) lead to the starter solenoid B-terminal and repeat the test.
If the voltage reading at the B-terminal is less than 0.5 volt, the problem is either in the connections at the starter solenoid or the starter solenoid.
Remove the wires at the starter solenoid B-, S-and M-terminals. Clean the connections and install the cables. Repeat Steps 1 through 5 above. If the reading is still higher than 0.5 volt at the M-terminal and 0.5 volt or lower at the B-terminal, the problem is in the starter solenoid. Install a new starter motor. Refer to «STARTER MOTOR - 4.0L SOHC»(ref-256459-S06739860992007061500000) or «STARTER MOTOR - 4.6L (3V)»(ref-256459-S22606761852007061500000) in this article.
If the voltage taken at the starter solenoid B-terminal is greater than 0.5 volt, the problem is either the positive (+) battery cable connection or the positive (+) battery cable.

Starter Motor - Motor Ground Circuit