LEMON Manuals: Even more car manuals for everyone
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 G: DTCs B29A1, B29AB, B29A3 and B29AD - Suppressor Left/Right Circuit Short to Ground/Low Resistance - Loop #2

Pinpoint Test G: DTCs B29A1, B29AB, B29A3 and B29AD - Suppressor Left/Right Circuit Short to Ground/Low Resistance - Loop #2

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 fire suppressor circuits for faults. If the FSSM detects a short to ground on the LH fire suppressor squib 2 circuits, it stores DTC B29A1 in continuous memory and illuminates the fire suppression system indicator. If the FSSM detects a low resistance condition between the LH fire suppressor squib 2 circuits, it stores DTC B29A3 in continuous memory and illuminates the fire suppression system indicator. If the FSSM detects a short to ground on the RH fire suppressor squib 2 circuits, it stores DTC B29AB in continuous memory and illuminates the fire suppression system indicator. If the FSSM detects a low resistance condition between the RH fire suppressor squib 2 circuits, it stores DTC B29AD in continuous memory and illuminates the fire suppression system indicator.

DTC B29A1 (Suppressor Left Circuit Short to Ground - Loop #2) - sets when the FSSM detects a short to ground on the left fire suppressor squib 2 circuits 2328 (OG) and 2329 (DG). This DTC will cause the fire suppression system indicator to illuminate.

DTC B29AB (Suppressor Right Circuit Short to Ground - Loop #2) - sets when the FSSM detects a short to ground on the right fire suppressor squib 2 circuits 2326 (LG) and 2327 (BK/WH). This DTC will cause the fire suppression system indicator to illuminate.

DTC B29A3 (Suppressor Left Circuit Resistance Low on Squib - Loop #2) - sets when the FSSM detects a low resistance condition on the left fire suppressor squib 2 circuits 2328 (OG) and 2329 (DG). This DTC will cause the fire suppression system indicator to illuminate.

DTC B29AD (Suppressor Right Circuit Resistance Low on Squib - Loop #2) - sets when the FSSM detects a low resistance condition on the right fire suppressor squib 2 circuits 2326 (LG) and 2327 (BK/WH). This DTC will cause the fire suppression system indicator to illuminate.

This pinpoint test is intended to diagnose the following:

PINPOINT TEST G: DTCs B29A1, B29AB, B29A3 AND B29AD - SUPPRESSOR LEFT/RIGHT CIRCUIT SHORT TO GROUND/LOW RESISTANCE - LOOP #2 

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: 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. G1 CHECK FOR ON-DEMAND DTCs OR CONTINUOUS MEMORY DTCs 
    • Carry out the FSSM self-test.
    • Were DTCs B29A1, B29AB, B29A3, or B29AD retrieved as on-demand DTCs during the self-test? 
    1. YES  : Go to  G2.
    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. G2 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: FSSM C3281b
    • Connect the battery.
      • NOTE: DTCs B299F and B29A9 are expected to be retrieved when the self-test is performed with the FSSM C3281b disconnected. These DTCs can be cleared once all the fire suppression connections are restored. If DTCs B299F or B29A9 are retrieved with all the fire suppression connections restored, refer to the FIRE SUPPRESSION SYSTEM MODULE (FSSM) DIAGNOSTIC TROUBLE CODE INDEX .
    • Carry out the FSSM self-test.
    • Were DTCs B29A1, B29AB, B29A3, or B29AD retrieved as on-demand DTCs during the self-test? 
    1. YES  : INSTALL a new FSSM. REFER to Fire Suppression System Module (FSSM) . Go to  G4.
    2. NO  : DISCONNECT the battery. CONNECT the FSSM C3281b. CONNECT the battery. CLEAR DTCs B299F and B29A9. Go to  G3.
  3. G3 CHECK THE FIRE SUPPRESSORS 
      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.
    • Wait approximately 60 seconds to allow the fire suppression system backup power supply to deplete.
    • Disconnect: Suspect Fire Suppressor
    • Connect the battery.
      • NOTE: DTCs B299A and B299F are expected to be retrieved when the self-test is performed with the LH Fire Suppressor C4317 disconnected. DTCs B29A4 and B29A9 are expected to be retrieved when the self-test is performed with the RH Fire Suppressor C4316 disconnected. These DTCs can be cleared once all the fire suppression connections are restored. If DTCs B299A, B299F, B29A4, or B29A9 are retrieved with all the fire suppression connections restored, refer to the FIRE SUPPRESSION SYSTEM MODULE (FSSM) DIAGNOSTIC TROUBLE CODE INDEX .
    • Carry out the FSSM self-test.
    • Were DTCs B29A1, B29AB, B29A3, or B29AD retrieved as on-demand DTCs during the self-test? 
    1. YES  : INSTALL a new fire suppression system harness. Go to  G4.
    2. NO  : If DTC B29AB or B29AD was retrieved in Step G1, INSTALL a new RH fire suppressor. REFER to Fire Suppressor . Go to  G4.

      If DTC B29A1 or B29A3 was retrieved in Step G1, INSTALL a new LH fire suppressor. REFER to Fire Suppressor . Go to  G4.

  4. G4 CHECK FOR ADDITIONAL DTCs 
    • Refer to the continuous memory DTCs recorded during Step G1.
    • Were any continuous memory DTCs retrieved during Step G1? 
    1. YES  : REFER to the FIRE SUPPRESSION SYSTEM MODULE (FSSM) DIAGNOSTIC TROUBLE CODE INDEX .
    2. NO  : CLEAR the DTCs. REPEAT the self-test.
scientia non olet · About LEMON Manuals