Ford Mustang (1999-2004) Service Manual: Pinpoint Tests
CAUTION: Do not make jumper connections except as directed. Incorrect connections may damage the voltage regulator test terminals, fuses, or fuse links.
CAUTION: Do not allow any metal object to come in contact with the generator housing and internal diode cooling fins.
NOTE: All voltage measurements are referenced to the negative (-) battery post unless otherwise specified.
PINPOINT TEST A: BATTERY IS DISCHARGED OR VOLTAGE IS LOW
Test Step | Result / Action to Take |
A1 CHECK BATTERY CONDITION | Yes GO to A2 . No INSTALL a new battery. REFER to Section. TEST the system for normal operation |
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A2 CHECK THE GENERATOR OUTPUT | Yes GO to A3 . No GO to Pinpoint Test B . |
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A3 CHECK FOR CURRENT DRAINS | Yes REPAIR as necessary. TEST the system for normal operation. No GO to A4 |
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A4 CHECK FOR CURRENT DRAINS WHICH SHUT OFF WHEN THE BATTERY IS DISCONNECTED | Yes REPAIR as necessary. TEST the system for normal operation. No GO to Pinpoint Test B . |
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PINPOINT TEST B: THE CHARGING SYSTEM WARNING INDICATOR IS ON WITH THE ENGINE RUNNING (THE BATTERY VOLTAGE DOES NOT INCREASE)
Test Step | Result / Action to Take |
B1 CHECK GENERATOR B+ CIRCUIT 38 (BK/OG) | Yes GO to B2 . No REPAIR the circuit. TEST the system for normal operation. |
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B2 CHECK GENERATOR A CIRCUIT 36 (YE/WH) | Yes GO to B3 . No REPAIR the circuit. TEST the system for normal operation. |
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B3 CHECK I CIRCUIT 904 (LG/RD) FOR AN OPEN | Yes GO to B4 . No REPAIR the circuit. TEST the system for normal operation. |
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B4 CHECK FOR VOLTAGE DROP IN B+ CIRCUIT 38 (YE/WH) | Yes INSTALL a new generator. REFER to Section . TEST the system for normal operation. No REPAIR high resistance in the B+ circuit 38 (BK/OG). TEST the system for normal operation. |
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PINPOINT TEST C: THE SYSTEM OVERCHARGES (THE BATTERY VOLTAGE IS GREATER THAN 15.5 VOLTS)
Test Step | Result / Action to Take |
C1 CHECK FOR VOLTAGE DROP IN A CIRCUIT 36 (YE/WH) | Yes GO to C2 . No REPAIR the high resistance in A circuit 36 (YE/WH). TEST the system for normal operation. |
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C2 CHECK GENERATOR AND BATTERY GROUND CONNECTIONS | Yes INSTALL a new generator. REFER to Section. TEST the system for normal operation. No REPAIR ground connections as necessary. TEST the system for normal operation. |
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PINPOINT TEST D: THE CHARGING SYSTEM WARNING INDICATOR IS ON WITH THE ENGINE RUNNING AND THE BATTERY INCREASES VOLTAGE
Test Step | Result / Action to Take |
D1 CHECK I CIRCUIT 904 (LG/RD) FOR A SHORT TO GROUND | Yes REPAIR circuit 904 (LG/RD) for a short to ground. TEST the system for normal operation. No INSTALL a new generator. REFER to Section. TEST the system for normal operation. |
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PINPOINT TEST E: THE CHARGING SYSTEM WARNING INDICATOR IS OFF WITH THE IGNITION SWITCH IN THE RUN POSITION AND THE ENGINE OFF
Test Step | Result / Action to Take |
E1 CHECK THE CHARGING SYSTEM WARNING INDICATOR LAMP | Yes INSTALL a new generator. REFER to Section. TEST the system for normal operation. No REFER to Section for diagnosis and testing of the instrument cluster |
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PINPOINT TEST F: THE CHARGING SYSTEM WARNING INDICATOR LAMP FLICKERS OR IS INTERMITTENT
Test Step | Result / Action to Take |
F1 CHECK FOR LOOSE CONNECTIONS | Yes GO to F2 . No REPAIR as necessary. TEST the system for normal operation. |
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F2 CHECK FUSE | Yes REPAIR loose fuse connections as necessary. TEST the system for normal operation. No GO to F3 . |
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F3 CHECK A CIRCUIT 36 (YE/WH) CONNECTIONS | Yes REFER to Section. TEST the system for normal operation. No REPAIR loose connection(s) in circuits. TEST the system for normal operation. |
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PINPOINT TEST G: THE GENERATOR IS NOISY
Test Step | Result / Action to Take |
G1 CHECK FOR ACCESSORY DRIVE NOISE | Yes GO to G2 . No REPAIR as necessary. REFER to Section for diagnosis and testing of the accessory drive system. TEST the system for normal operation. |
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G2 CHECK GENERATOR MOUNTING | Yes GO to G3 . No REPAIR as necessary. TEST the system for normal operation. |
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G3 CHECK GENERATOR FOR ELECTRICAL NOISE | Yes GO to G4 . No INSTALL a new generator. REFER to Section. TEST the system for normal operation. |
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G4 CHECK GENERATOR FOR MECHANICAL NOISE | Yes INSTALL a new generator. REFER to Section. TEST the system for normal operation. No REFER to Section to diagnose the source of engine noise. |
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PINPOINT TEST H: RADIO INTERFERENCE
Test Step | Result / Action to Take |
H1 VERIFY GENERATOR IS SOURCE OF RADIO INTERFERENCE | Yes REFER to Section for diagnosis and testing of the in-vehicle entertainment system. No INSTALL a new generator. REFER to Section. TEST the system for normal operation. |
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Inspection and Verification
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Installation
Using special tool 205-054
NOTE: This is the preferred method for installing the pinion bearing
cups. If necessary, proceed to
Using special tools 205-153, 205-054, and 205-D055 in this procedure for an
alternate method.
1. Position the special tools and th ...
Mass Air Flow (MAF) Sensor - Mach I
Removal
CAUTION: The mass air flow (MAF) sensor hot wire sensing
element and housing are
calibrated as a unit and must be repaired as a complete assembly. Do not
damage the sensing
element (internal to housing) or possible failure to the mass air f ...
Bulb
Removal and Installation
1. Remove the floor console. For additional information, refer to
Section.
2. Remove the bolts, then position the bezel upward.
3. Remove the bulb socket from the bezel.
4. Remove the bulb.
5. To install, reverse the removal ...