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Starting System: Other Ford Mustang IV рестайлинг

Starter 4 illustrations ~1241 words

DIGITAL TRANSMISSION RANGE SENSOR

CAUTIONWhen battery is disconnected, vehicle computer and memory systems may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION before disconnecting battery.

Disconnect battery negative cable. Place transmission in Neutral position. Raise vehicle on hoist. Disconnect shift cable at Digital Transmission Range (DTR) sensor, loosen sensor bolts and install DTR Sensor Alignment Tool (T97L-70010-A). Tighten bolts to specification. See TORQUE SPECIFICATIONS . Reconnect shift cable, lower vehicle and reconnect negative battery cable.

SYSTEM TESTS

SymptomPerform Test
Starter Does Not CrankA
Unusual Starter NoiseB
Engine Cranks Slowly(1)
Starter Spins But Engine Does Not Crank(2)
(1) Perform VOLTAGE DROP TEST under ON-VEHICLE TESTING. (2) Inspect starter motor mounting. Inspect flywheel ring gear and starter motor gear for damaged and missing teeth. Repair or replace components as necessary.
(1)Perform VOLTAGE DROP TEST under ON-VEHICLE TESTING.
(2)Inspect starter motor mounting. Inspect flywheel ring gear and starter motor gear for damaged and missing teeth. Repair or replace components as necessary.

SYMPTOM INDEX

Scheme 4

Scheme 4: TEST A: STARTER DOES NOT CRANK
Scheme 4: TEST A: STARTER DOES NOT CRANK

Scheme 5

Scheme 5
Scheme 5

Scheme 6

Scheme 6
Scheme 6
  1. Verify battery condition. Battery voltage should be 12 volts or more. Load test battery at approximately one-half cold cranking amperage rating. See load tester manufacturer's instructions. If battery is okay, go to next step. If battery voltage is less than 12 volts or loaded battery voltage is less than 9.6 volts, service battery or charging system as necessary.
  2. Measure voltage between positive battery terminal and battery ground cable connection on engine. If battery voltage is present, go to next step. If battery voltage is not present, replace battery ground cable and check for normal system operation.
  3. Measure voltage between battery positive terminal and starter motor housing. If battery voltage is present, go to next step. If battery voltage is not present, verify starter is correctly and tightly installed. If starter installation is okay, remove starter motor and clean mounting surfaces. See «STARTER MOTOR»(ref-99005-S17418413562001061200000) under REMOVAL & INSTALLATION. Install starter motor and check system for normal operation.
  4. Measure voltage between starter motor battery cable terminal and ground. If battery voltage is present, go to next step. If battery voltage is not present, replace battery positive cable and check for normal system operation.
  5. Momentarily jump starter positive battery cable terminal and start terminal (White/Pink wire). If starter motor operates properly, go to next step. If starter motor does not operate properly, replace starter motor and check system for normal operation. See «STARTER MOTOR»(ref-99005-S17418413562001061200000) under REMOVAL & INSTALLATION.
  6. Disconnect starter electrical connector (White/Pink wire). Place transmission in Park or Neutral (A/T), or depress clutch pedal (M/T). Measure voltage between connector terminal (White/Pink wire) and ground with ignition switch in START position. If battery voltage is not present, go to next step. If battery voltage is present, clean starter motor and connector terminals. Check for loose or intermittent connection. Check system for normal operation.
  7. Turn ignition off. Remove starter relay from battery junction box. Place transmission in Park or Neutral (A/T), or depress clutch pedal (M/T). Measure voltage between starter relay connector terminal No. 85 (White/Pink wire) and ground with ignition switch in START position. (Scheme 4) If battery voltage is present, go to next step. If battery voltage is not present, go to step 12.
  8. Turn ignition off. Measure voltage between starter relay connector terminal No. 30 (Light Green/Violet wire ) and ground. If battery voltage is present, go to next step. If battery voltage is not present, check IGNITION SWITCH fuse (40-amp) in battery junction box. If fuse is okay, repair open in Light Green/Purple wire between fuse and starter relay connector and check system for normal operation.
  9. Measure resistance between starter relay terminal No. 86 (Black wire) and ground. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or greater, repair open in Black wire between starter relay connector and ground and check system for normal operation.
  10. Measure resistance between starter relay connector terminal No. 87 (Brown/Pink wire) and ground. If resistance is greater than 10,000 ohms, go to next step. If resistance is 10,000 ohms or less, repair short to ground in Brown/Pink wire and check system for normal operation.
  11. Measure resistance between starter relay connector terminal No. 87 (Brown/Pink wire) and starter motor connector (White/Pink wire). If resistance is less than 5 ohms, install new starter relay and check system for normal operation. If resistance is greater than 5 ohms, repair open in Brown/Pink wire and/or White/Pink wire. See «WIRING DIAGRAMS»(ref-99005-S27160653152001061200000).
  12. On M/T models, disconnect Clutch Pedal Position (CPP) switch connector. On A/T models, disconnect CPP jumper connector located left of pedal assembly. To identify harness, see «WIRING DIAGRAMS»(ref-99005-S27160653152001061200000). On all models, measure voltage between CPP connector (or jumper connector) Red/Light Blue wire and ground with ignition switch in START position. If battery voltage is present, go to step 14. If battery voltage is not present, go to next step.
  13. Measure voltage between central junction box fuse No. 6 (20-amp) input side and ground with ignition switch in START position. If battery voltage is not present, go to step 17. If battery voltage is present, check fuse No. 6. If fuse is okay, repair Red/Light Blue wire between fuse and CPP connector, (or CPP jumper connector), and check system for normal operation.
  14. Measure resistance in White/Pink wire between CPP connector (or CPP jumper connector) and starter relay connector terminal No. 85. If resistance is less than 5 ohms, replace CPP switch (or CPP jumper connector) and check system for normal operation. If resistance is greater than 5 ohms, go to next step (A/T) or repair wire between CPP switch and starter relay connector (M/T). Check system for normal operation. See «WIRING DIAGRAMS»(ref-99005-S27160653152001061200000).
  15. Disconnect Digital Transmission Range (DTR) sensor. Measure resistance between CPP jumper harness connector (White/Pink wire) and DTR sensor connector terminal No. 10 (Red/Light Blue wire). (Scheme 5) If resistance is 5 ohms or less, go to next step. If resistance is greater than 5 ohms, repair open White/Pink wire and/or Red/Light Blue wire between CPP jumper connector and DTR sensor connector. Check system for normal operation. See «WIRING DIAGRAMS»(ref-99005-S27160653152001061200000).
  16. Measure resistance of White/Pink wire between starter relay connector terminal No. 85 and DTR sensor connector terminal No. 12. If resistance is greater than 5 ohms, repair open White/Pink wire between starter relay connector and DTR sensor connector and check system for normal operation. If resistance is 5 ohms or less, adjust DTR sensor and recheck. See «TRANSMISSION RANGE SENSOR»(ref-99005-S24309001842001061200000) under ADJUSTMENTS. If resistance is still 5 ohms or less, replace DTR sensor and check system for normal operation.
  17. Turn ignition off. Disconnect ignition switch harness connector. Measure voltage between ignition switch harness connector terminal No. B4 and ground. (Scheme 6) If battery voltage is present, go to next step. If battery voltage is not present, check IGNITION SWITCH fuse (40-amp) in battery junction box. If fuse is okay, repair Light Green/Purple wire between IGNITION SWITCH fuse and ignition switch harness connector. Check system for normal operation.
  18. Measure resistance between ignition switch harness connector terminal STA and central junction box fuse No. 6 input terminal. (Scheme 6) If resistance is less than 5 ohms, replace ignition switch and check system for normal operation. If resistance is 5 ohms or greater, repair White/Pink wire between ignition switch and fuse. Check system for normal operation.

STARTER RELAY

  1. Remove starter relay from battery junction box. Battery junction box is located in left side of engine compartment, in front of strut tower. Check relay continuity. Continuity should exist between relay terminals No. 85 and 86, and between relay terminals No. 30 and 87a. (Scheme 7) Continuity should not exist between relay terminals No. 30 and 87. If continuity is as specified, go to next step. If continuity is not as specified, replace relay.
  2. Using a jumper wire, apply battery voltage to relay terminal No. 85. Using a second jumper wire, ground relay terminal No. 86. Continuity should now exist between relay terminals No. 30 and 87. If continuity is not as specified, replace relay. If continuity is as specified, relay is okay at this time.

Scheme 7

Scheme 7
Scheme 7

STARTER MOTOR

CAUTIONWhen battery is disconnected, vehicle computer and memory systems may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION before disconnecting battery.

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