Ford Mustang (1999-2004) Service Manual: Inspection and Verification

1. Verify the customer concern.

2. Visually inspect for obvious signs of electrical damage.

Visual Inspection Chart

Electrical

  • Central junction box (CJB) Fuse 31 (5A)

  • Damaged wiring harness

  • Loose or corroded connections

  • Anti-lock brake control module without traction control (optional)

  • Anti-lock brake control module with traction control (optional)

  • Generic electronic module (GEM)

  • Restraint control module (RCM)

  • Powertrain control module (PCM)

  • Instrument cluster

3. If the concern remains after the inspection, connect diagnostic tool to the data link connector (DLC) located beneath the instrument panel and select the vehicle to be tested from diagnostic tool menu. If diagnostic tool does not communicate with the vehicle:

  • check that the program card is correctly installed.
  • check that the correct version of the program card is installed.
  • check the connections to the vehicle.
  • check the ignition switch position.

If the diagnostic tool still does not communicate with the vehicle, go to Pinpoint Test H.

4. Go to Pinpoint Test PC.

System Precheck

PINPOINT TEST PC: DATA LINK DIAGNOSTICS NETWORK TEST

Test Step Result / Action to Take
PC1 DATA LINK DIAGNOSTICS NETWORK TEST Yes

Test PASSED. RETURN to the Symptom Chart of the section for the module in question.

No

If no response from the diagnostic tool, GO to Pinpoint Test H .

If CKT70=ALL ECUS NO RESP / NOT EQUIP, GO to Pinpoint Test F .

If CKT914 or CKT915=ALL ECUS NO RESP / NOT EQUIP, GO to Pinpoint Test G .

If CKT70, CKT914, or CKT915=SOME ECUS NO RESP/NOT EQUIP, REFER to Symptom Chart.

If the module in question is NO RESPONSE ON CKT914 (BUS+), or NO RESPONSE ON CKT915 (BUS-), REFER to Symptom Chart.

If the module in question is NO RESPONSE/NOT EQUIPPED, REFER to Symptom Chart.
  • Run the Data Link Diagnostics Network Test.
  • Is SYSTEM PASSED obtained?

Symptom Chart

Condition Possible Sources Action
  • The module does not respond to the diagnostic tool - anti-lock brake control module
  • Wire or connection in SCP communication network (with traction control).
  • Wire or connection in ISO 9141 communication network (without traction control).
  • Anti-lock brake control module without traction control (optional).
  • Anti-lock brake control module with traction control (optional).
  • GO to Pinpoint Test A .
  • The module does not respond to the diagnostic tool - generic electronic module (GEM)
  • Wire or connection in ISO 9141 communication network.
  • GEM.
  • GO to Pinpoint Test B
  • The module does not respond to the diagnostic tool - restraint control module (RCM)
  • Wire or connection in ISO 9141 communication network.
  • RCM.
  • GO to Pinpoint Test C .
  • The module does not respond to the diagnostic tool - instrument cluster
  • Wire or connection in SCP communication network
  • Instrument cluster.
  • GO to Pinpoint Test D .
  • The module does not respond to the diagnostic tool - powertrain control module (PCM)
  • Wire or connection in SCP communication network.
  • PCM.
  • GO to Pinpoint Test E
  • No module/network communication - ISO 9141 network
  • Wire or connection in ISO 9141 communication network.
  • ISO 9141 networked modules.
  • GO to Pinpoint Test F .
  • No module/network communication - SCP network
  • Wire or connection in SCP communication network.
  • SCP networked modules
  • GO to Pinpoint Test G .
  • No module/network communication - no power to the diagnostic tool
  • CJB Fuse 31 (5A).
  • DLC pins.
  • Scan tool.
  • Circuitry.
  • GO to Pinpoint Test H .
    Principles of Operation
    The vehicle has two module communications networks. The standard corporate protocol (SCP) which is an unshielded twisted pair cable (data bus plus, Circuit 914 [TN/OG] and data bus minus, Circuit ...

    Pinpoint Tests
    CAUTION: Be careful when probing the CJB, battery junction box (BJB) or any connectors. Damage will result to the connector receptacle if the probe or terminal being used is too large. CAUTION ...

    Other materials:

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    Air Bag Supplemental Restraint System (SRS) (Diagnosis and Testing)
    Refer to Wiring Diagrams Cell 46 , Air Bag for schematic and connector information. Special Tool(s) Diagnostic Tool, Restraint System 418-F088 (105-R0012) Restraint System Diagnostic Tool Warning WARNING: This tool is for restraint system se ...

    Changing a fuse
    Fuses WARNING: Always replace a fuse with one that has the specified amperage rating. Using a fuse with a higher amperage rating can cause severe wire damage and could start a fire. If electrical components in your vehicle are not working, a fuse may have blo ...