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DTC P0A94 (1.5 L Engine) (2021)

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DTC P0A94  : DC-DC Converter Performance Problem

NOTE:  Before you troubleshoot, review the general troubleshooting information .

DTC Description Confirmed DTC Pending DTC
P0A94 DC-DC Converter Performance Problem    

DTC (PGM-FI)

  1. DTC check

    -1. Turn the vehicle to the ON mode.

    -2. Clear the DTC with the HDS.

    -3. Turn the vehicle to the OFF (LOCK) mode.

    -4. Test-drive the vehicle under the auto idle stop system operating condition, and stop the engine using auto idle stop .

    NOTE:  If the auto idle stop system indicator (amber) blinks and the engine keeps running, go to step 1

    -5. Check for Pending or Confirmed DTCs with the HDS.

    DTC Description Confirmed DTC Pending DTC
    P16E5 LIN Communication Error (PCM - DC-DC Converter)    

    Is DTC P16E5 indicated?

    YES 

    Go to the troubleshooting for DTC P16E5 .

    NO 

    Go to step 2.

  2. Problem verification

    -1. Check for Pending or Confirmed DTCs with the HDS.

    DTC Description Confirmed DTC Pending DTC
    P0A94 DC-DC Converter Performance Problem    

    Is DTC P0A94 indicated?

    YES 

    Go to step 3.

    NO 

    Check the fuses in the auxiliary under-dash fuse/relay box. If the fuse (s) is blown, repair a short in the fuse circuit. If it is OK, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the DC-DC converter and the PCM. If the on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot .

  3. Determine possible failure area (DCDC STS line, others)

    -1. Check the parameter (s) below with the HDS.

    Signal Threshold Current conditions
    Values Unit Values Unit
    DC-DC Converter Cst Error Normal      

    Do the current condition (s) match the threshold?

    YES 

    Go to step 5.

    NO 

    Go to step 4.

  4. Shorted wire check (DCDC STS line)

    -1. Turn the vehicle to the OFF (LOCK) mode.

    -2. Jump the SCS line with the HDS, and wait more than 1 minute.

    -3. Disconnect the following connectors.

    DC-DC converter connector A (3P)
    PCM connector A (50P)

    -4. Check for continuity between test points 1 and 2.

    Test condition Vehicle OFF (LOCK) mode
      DC-DC converter connector A (3P): disconnected
      PCM connector A (50P): disconnected
    Test point 1 DC-DC converter connector A (3P) (female terminals) No. 2:
    Test point 2 Body ground
    GHH393541Courtesy of HONDA, U.S.A., INC.

    Is there 1 MΩ or more?

    YES 

    The DCDC STS wire is OK. Replace the DC-DC converter . If DTC P0A94 was indicated after the DC-DC converter was replaced, check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM .

    NO 

    Repair a short in the DCDC STS wire between the PCM (A14) and the DC-DC converter.

  5. Open wire check (GND line)

    -1. Turn the vehicle to the OFF (LOCK) mode.

    -2. Disconnect the following connector.

    DC-DC converter connector B (5P)

    -3. Check for continuity between test points 1 and 2.

    Test condition Vehicle OFF (LOCK) mode
      DC-DC converter connector B (5P): disconnected
    Test point 1 DC-DC converter connector B (5P) (female terminals) No. 4:
    Test point 2 Body ground
    GHH393543Courtesy of HONDA, U.S.A., INC.

    Is there 1.0 Ω or less?

    YES 

    Go to step 6.

    NO 

    Repair an open in the GND wire between the DC-DC converter and G304.

  6. Determine possible failure area (DC-DC converter input/output lines)

    -1. Reconnect the following connector.

    DC-DC converter connector B (5P)

    -2. Turn the vehicle to the ON mode.

    -3. Check the parameter (s) below with the HDS.

    Signal Current conditions
    Values Unit
    DC-DC Converter Input Error 1    
    DC-DC Converter Input Error 2    
    DC-DC Converter Output Error 1    
    DC-DC Converter Output Error 2    

    Do these parameters indicate Malfunction?

    DC-DC converter input error 1 indicates Malfunction

    Go to step 7.

    DC-DC converter input error 2 indicates Malfunction

    Go to step 9.

    DC-DC converter output error 1 indicates Malfunction

    Check for DCDC OUT1 circuit shorted, or aftermarket parts connected to DCDC OUT1 wire. Repair a short in DCDC OUT1 circuit or remove the aftermarket parts if needed. If DCDC OUT1 wire is OK, replace the DC-DC converter .

    DC-DC converter output error 2 indicates Malfunction

    Check for DCDC OUT2 circuit shorted, or aftermarket parts connected to DCDC OUT2 wire. Repair a short in DCDC OUT2 circuit or remove the aftermarket parts if needed. If DCDC OUT2 wire is OK, replace the DC-DC converter .

    All parameters indicates Normal

    DC-DC converter input and output lines are OK. Replace the DC-DC converter .

  7. Fuse check

    -1. Turn the vehicle to the OFF (LOCK) mode.

    -2. Check the following fuse.

    Fuse No. A3-1

    Is the fuse OK?

    YES 

    Go to step 8.

    NO 

    Check for a short in the +B DC/DC1 wire between the No. A3-1 fuse and the DC-DC converter, the DCDC OUT1 wire between the DC-DC converter and the fuse/relay holder A, and repair it if needed. Also replace the No. A3-1 fuse.

  8. Open wire check (+B DC/DC1 line)

    -1. Disconnect the following connector.

    DC-DC converter connector B (5P)

    -2. Measure the voltage between test points 1 and 2.

    Test condition Vehicle OFF (LOCK) mode
      DC-DC converter connector B (5P): disconnected
    Test point 1 DC-DC converter connector B (5P) (female terminals) No. 1:
    Test point 2 Body ground
    GHH393545Courtesy of HONDA, U.S.A., INC.

    Is there battery voltage?

    YES 

    The +B DC/DC1 wire is OK. Replace the DC-DC converter . If DTC P0A94 was indicated after the DC-DC converter was replaced, check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM .

    NO 

    Repair an open in the +B DC/DC1 wire between the DC-DC converter and the No. A3-1 fuse .

  9. Fuse check

    -1. Turn the vehicle to the OFF (LOCK) mode.

    -2. Check the following fuse.

    Fuse No. A4-1

    Is the fuse OK?

    YES 

    Go to step 10.

    NO 

    Check for a short in the +B DC/DC2 wire between the No. A4-1 fuse and the DC-DC converter, the DCDC OUT2 wire between the DC-DC converter and the fuse/relay holder A, and repair it if needed. If the wires are OK, replace the DC-DC converter . Also replace the No. A4-1 fuse.

  10. Open wire check (+B DC/DC2 line)

    -1. Disconnect the following connector.

    DC-DC converter connector B (5P)

    -2. Measure the voltage between test points 1 and 2.

    Test condition Vehicle OFF (LOCK) mode
      DC-DC converter connector B (5P): disconnected
    Test point 1 DC-DC converter connector B (5P) (female terminals) No. 2:
    Test point 2 Body ground
    GHH393547Courtesy of HONDA, U.S.A., INC.

    Is there battery voltage?

    YES 

    The +B DC/DC2 wire is OK. Replace the DC-DC converter . If DTC P0A94 was indicated after the DC-DC converter was replaced, check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM .

    NO 

    Repair an open in the +B DC/DC2 wire between the DC-DC converter and the No. A4-1 fuse .

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