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Home >> Mercury >> 2009 >> Mariner Base, 2.5 7, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 98 (Fire Suppression System) >> Diagnostic Tests >> Fire Suppression System >> Pinpoint Tests >> Pinpoint Test B: DTC B299A - Suppressor Left Circuit Open - Loop #1

Pinpoint Test B: DTC B299A - Suppressor Left Circuit Open - Loop #1

WARNING: This page is about a different car, the 2009 Mercury Grand Marquis and 2009 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.

Refer to appropriate SYSTEM WIRING DIAGRAMS article, Police Option for schematic and connector information.

Normal Operation 

The fire suppression system module (FSSM) checks all of the LH fire suppressor circuits for faults. If the FSSM detects an open on the LH fire suppressor squib 1 circuits, it stores DTC B299A in continuous memory and illuminates the fire suppression system indicator.

DTC B299A (Suppressor Left Circuit Open - Loop #1) - sets when the FSSM detects an open on the left fire suppressor squib 1 circuits 2312 (LG) and 2313 (BK/WH). This DTC will cause the fire suppression system indicator to illuminate.

This pinpoint test is intended to diagnose the following:

PINPOINT TEST B: DTC B299A - SUPPRESSOR LEFT CIRCUIT OPEN - LOOP #1 

WARNING: To reduce the risk of accidental deployment, never probe the connectors on the fire suppressors. Failure to follow this instruction may cause unintentional deployment of the suppressors, which may result in serious personal injury.
NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
NOTE: Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint test.
NOTE: The fire suppression system must be fully operational and free of faults before releasing the vehicle to the customer.
  1. B1 CHECK FOR AN ON-DEMAND DTC OR A CONTINUOUS MEMORY DTC 
    • Carry out the FSSM self-test.
    • Was DTC B299A retrieved as an on-demand DTC during the self-test? 
    1. YES  : Go to  B2.
    2. NO  : CHECK for causes of the intermittent fault. ATTEMPT to recreate the hard fault by flexing the wire harness and cycling the key in the ignition lock cylinder frequently. REPEAT the self-test.
  2. B2 CHECK THE FSSM 
    • Key in OFF position.
      • WARNING: To reduce the risk of accidental deployment, do not use any memory saver devices when depowering the fire suppression system. Failure to follow this instruction may result in serious personal injury.
    • Disconnect the battery. Refer to BATTERY, MOUNTING & CABLES article.
    • Wait approximately 60 seconds to allow the fire suppression system backup power supply to deplete.
    • Disconnect: Inline C339
    • Install the fire suppression system diagnostic tool to the inline C339, body harness side.
    • Connect the battery.
      • NOTE: DTCs B299E and B29A8 are expected to be retrieved when the self-test is carried out with the fire suppression diagnostic tool installed on the inline C339. These DTCs can be cleared once all the fire suppression connections are restored. If DTCs B299E or B29A8 are retrieved with the diagnostic tool disconnected, refer to the FIRE SUPPRESSION SYSTEM MODULE (FSSM) DIAGNOSTIC TROUBLE CODE INDEX .
    • Carry out the FSSM self-test.
    • Was DTC B299E retrieved as an on-demand DTC during the self-test? 
    1. YES  : DISCONNECT the battery. WAIT 60 seconds for the fire suppression system backup power supply to deplete. REMOVE the fire suppression system diagnostic tool. CONNECT the inline C339. CONNECT the battery. CLEAR DTCs B299E and B29A8. Go to  B3.
    2. NO  : INSTALL a new FSSM. REFER to Fire Suppression System Module (FSSM) . Go to  B5.
  3. B3 CHECK CIRCUIT 2312 (LG) AND CIRCUIT 2313 (BK/WH) FOR AN OPEN 
    • Key in OFF position.
      • WARNING: To reduce the risk of accidental deployment, do not use any memory saver devices when depowering the fire suppression system. Failure to follow this instruction may result in serious personal injury.
    • Disconnect the battery. Refer to BATTERY, MOUNTING & CABLES article.
    • Wait approximately 60 seconds to allow the fire suppression system backup power supply to deplete.
    • Disconnect: FSSM C3281a
    • Disconnect: Inline C339
      • Fig 1: Measuring Resistance
      GF0046802Courtesy of FORD MOTOR CO.
    • Measure the resistance between the FSSM C3281a-4, circuit 2313 (BK/WH), harness side and the inline C339-4, circuit 2313 (BK/WH), body harness side.
      • Fig 2: Measuring Resistance
      GF0046803Courtesy of FORD MOTOR CO.
    • Measure the resistance between the FSSM C3281a-5, circuit 2312 (LG), harness side and the inline C339-3, circuit 2312 (LG), body harness side.
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  B4.
    2. NO  : REPAIR the circuit in question. CONNECT the FSSM C3281a and the inline C339. CONNECT the battery. Go to  B5.
  4. B4 CHECK THE LH FIRE SUPPRESSOR 
    • Disconnect: LH Fire Suppressor C4317
    • Install the fire suppression system diagnostic tool to the LH Fire Suppressor C4317, harness side.
    • Connect the battery.
      • NOTE: DTCs B299E and B29A3 are expected to be retrieved when the self-test is carried out with the fire suppression diagnostic tool installed on the LH Fire Suppressor C4317. These DTCs can be cleared once all the fire suppression connections are restored. If DTCs B299E or B29A3 are retrieved with the diagnostic tool disconnected, refer to the FIRE SUPPRESSION SYSTEM MODULE (FSSM) DIAGNOSTIC TROUBLE CODE INDEX .
    • Carry out the FSSM self-test.
    • Was DTC B299E retrieved as an on-demand DTC during the self-test? 
    1. YES  : INSTALL a new LH fire suppressor. REFER to Fire Suppressor . Go to  B5.
    2. NO  : INSTALL a new fire suppression system harness. Go to  B5.
  5. B5 CHECK FOR ADDITIONAL DTCs 
    • Refer to the continuous memory DTCs recorded during Step B1.
    • Were any additional continuous memory DTCs retrieved during Step B1? 
    1. YES  : REFER to the FIRE SUPPRESSION SYSTEM MODULE (FSSM) DIAGNOSTIC TROUBLE CODE INDEX .
    2. NO  : CLEAR the DTCs. REPEAT the self-test.
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