DTC P0203

DTC P0203  : No. 3 Cylinder Injector Circuit Malfunction

DTC (PGM-FI)

1. Problem verification

   -1. Turn the vehicle to the ON mode.

   - 2. Clear the DTC with the HDS.

   - 3. Start the engine.

   NOTE: If the engine does not start, keep cranking for 10 seconds.

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

   DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
   P0203 No. 3 Cylinder Injector Circuit Malfunction

   Is DTC P0203 indicated?

   YES 

   Go to step 2.

   NO 

   Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the injector relay, the injector control module, the injector, and the PCM. If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot.

2. Engine starting check

   -1. Check the result in step 1-3.

   Did the engine start?

   YES 

   Go to step 11.

   NO 

   Go to step 3.

3. Relay check

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

   - 2. Remove the injector relay (A) from the under-hood fuse/relay box.

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   - 3. Test the injector relay.

   Is the relay OK?

   YES 

   Go to step 4.

   NO 

   Replace the injector relay.

4. Open wire check (IGP line)

   -1. Turn the vehicle to the ON mode.

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

   Test condition	Vehicle ON mode
   	Injector relay: disconnected
   Test circuit	IGP
   Test point 1	Injector relay 4P socket No. 3
   Test point 2	Body ground

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   Is there battery voltage?

   YES 

   Go to step 5.

   NO 

   Repair an open in the IGP wire between PGM-FI main relay 1 and the injector relay.

5. Open wire check (+B INJ line)

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

   Test condition	Vehicle ON mode
   	Injector relay: disconnected
   Test circuit	+B INJ
   Test point 1	Injector relay 4P socket No. 1
   Test point 2	Body ground

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   Is there battery voltage?

   YES 

   Go to step 7.

   NO 

   Go to step 6.

6. Fuse check

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

   - 2. Check the following fuse.

   Fuse	No. C14 (20 A)
   Location	Under-hood fuse/relay box

   Is the fuse OK?

   YES 

   Repair an open in the +B INJ wire between the No. C14 (20 A) fuse and the injector relay?.

   NO 

   Repair a short in the +B INJ wire between the No. C14 (20 A) fuse and the injector relay. Also replace the No. C14 (20 A) fuse. Replace the under-hood fuse/relay box if needed .

7. Determine possible failure area (INJ RLY line, others)

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

   Test condition	Vehicle ON mode
   	Injector relay: disconnected
   Test circuit	IGP, INJ RLY
   Test point 1	Injector relay 4P socket No. 3
   Test point 2	Injector relay 4P socket No. 4

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   Is there battery voltage?

   YES 

   Go to step 9.

   NO 

   Go to step 8.

8. Open wire check (INJ RLY line)

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

   - 2. Reinstall the injector relay.

   - 3. Jump the SCS line with the HDS.

   - 4. Disconnect the following connector.

   PCM connector A (51P) - Refer to: How to Troubleshoot the Fuel and Emissions Systems, or How to Troubleshoot the Brake Booster Pressure Monitoring System (2016 2017 2018 2019 2020), or How to Troubleshoot the Fuel and Emissions Systems(With Auto Idle Stop System) (2016), or How to Troubleshoot the A/T System (2014 2015)

   - 5. Turn the vehicle to the ON mode.

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

   Test condition	Vehicle ON mode
   	PCM connector A (51P): disconnected
   Test circuit	INJ RLY
   Test point 1	PCM connector A (51P) No. 17 (PNK)
   Test point 2	Body ground

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   Is there any voltage?

   YES 

   The INJ RLYwire is OK. Check for poor connections or loose terminals at the injector relay, the injector control module, the injector, and the PCM. Update the PCM if it does not have the latest software, or substitute a known-good PCM - Refer to: PCM Removal and Installation (2016), or PCM Removal and Installation (2014 2015) , then recheck. If DTC P0203 goes away and the PCM was updated, troubleshooting is complete. If DTC P0203 goes away and the PCM was substituted, replace the original PCM - Refer to: PCM Removal and Installation (2014 2015), or PCM Removal and Installation (2016) .

   NO 

   Repair an open in the INJ RLY wire between the PCM (A17) and the injector relay.

9. Open wire check (INJ RLY OUT/IG(EDU)1 line)

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

   - 2. Disconnect the following connector.

   Injector control module connector D (4P)

   - 3. Connect terminals A and B with a jumper wire.

   Terminal A	Injector relay 4P socket No. 1
   Terminal B	Injector relay 4P socket No. 2

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

   Test condition	Vehicle OFF (LOCK) mode
   	Injector relay: disconnected
   	Injector control module connector D (4P): disconnected
   	Injector relay 4P socket No. 1 and No. 2: jumped
   Test circuit	IG(EDU)1
   Test point 1	Injector control module connector D (4P) No. 1 (WHT)
   Test point 2	Body ground

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   Is there battery voltage?

   YES 

   Go to step 10.

   NO 

   Repair an open in the INJ RLY OUT/IG(EDU)1 wire between the injector relay and the injector control module.

10. Open wire check (INJ RLY OUT/IG(EDU)2 line)

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

    Test condition	Vehicle OFF (LOCK) mode
    	Injector relay: disconnected
    	Injector control module connector D (4P): disconnected
    	Injector relay 4P socket No. 1 and No. 2: jumped
    Test circuit	IG(EDU)2
    Test point 1	Injector control module connector D (4P) No. 2 (GRY)
    Test point 2	Body ground

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    Is there battery voltage?

    YES 

    Go to step 11.

    NO 

    Repair an open in the INJ RLY OUT/IG(EDU)2 wire between the injector relay and the injector control module.

11. Open wire check (INJ Ti 3 line)

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

    - 2. If needed, remove the jumper wire from the injector relay 4P socket, then reinstall the injector relay.

    - 3. If needed, reconnect the following connector.

    Injector control module connector D (4P)

    - 4. Jump the SCS line with the HDS.

    - 5. Disconnect the following connectors.

    Injector control module connector C (12P)

    PCM connector B (51P) - Refer to: How to Troubleshoot the A/T System (2014 2015), or How to Troubleshoot the Fuel and Emissions Systems, or How to Troubleshoot the Brake Booster Pressure Monitoring System (2016 2017 2018 2019 2020), or How to Troubleshoot the Fuel and Emissions Systems(With Auto Idle Stop System) (2016)

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

    Test condition	Vehicle OFF (LOCK) mode
    	Injector control module connector C (12P): disconnected
    	PCM connector B (51P): disconnected
    Test circuit	INJ Ti 3
    Test point 1	Injector control module connector C (12P) No. 11 (BLU)

    Test point 2

    PCM connector B (51P) No. 16 (BLU)

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    Is there continuity?

    YES 

    Go to step 12.

    NO 

    Repair an open in the INJ Ti 3 wire between the PCM (B16) and the injector control module.

12. Open wire check (INJF2 line)

    -1. Disconnect the following connector.

    PCM connector C (51P) - Refer to: How to Troubleshoot the Fuel and Emissions Systems, or How to Troubleshoot the A/T System (2014 2015), or How to Troubleshoot the Brake Booster Pressure Monitoring System (2016 2017 2018 2019 2020), or How to Troubleshoot the Fuel and Emissions Systems(With Auto Idle Stop System) (2016)

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

    Test condition	Vehicle OFF (LOCK) mode
    	Injector control module connector C (12P): disconnected
    	PCM connector B (51P): disconnected
    	PCM connector C (51P): disconnected
    Test circuit	INJF2
    Test point 1	Injector control module connector C (12P) No. 5 (GRY)
    Test point 2	PCM connector C (51P) No. 18 (GRY)

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    Is there continuity?

    YES 

    Go to step 13.

    NO 

    Repair an open in the INJF2 wire between the PCM (C18) and the injector control module.

13. Determine possible failure area (open in INJ HS3 line or INJ LS3 line, others)

    -1. Disconnect the following connector.

    Injector control module connector A (6P)

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

    Test condition	Vehicle OFF (LOCK) mode
    	Injector control module connector C (12P): disconnected
    	PCM connector B (51P): disconnected
    	PCM connector C (51P): disconnected
    	Injector control module connector A (6P): disconnected
    Test circuit	INJ HS3, INJ LS3
    Test point 1	Injector control module connector A (6P) No. 1 (BRN)
    Test point 2	Injector control module connector A (6P) No. 4 (GRN)

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    Is there continuity?

    YES 

    Go to step 16.

    NO 

    Go to step 14.

14. Open wire check (INJ HS3 line)

    -1. Disconnect the following connector.

    No. 3 cylinder injector 2P connector

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

    Test condition	Vehicle OFF (LOCK) mode
    	Injector control module connector C (12P): disconnected
    	PCM connector B (51P): disconnected
    	PCM connector C (51P): disconnected
    	Injector control module connector A (6P): disconnected
    	No. 3 cylinder injector 2P connector: disconnected
    Test circuit	INJ HS3
    Test point 1	No. 3 cylinder injector 2P connector No. 2 (BRN)
    Test point 2	Injector control module connector A (6P) No. 1 (BRN)

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    Is there continuity?

    YES 

    The INJ HS3 wire is OK. Go to step 15.

    NO 

    Repair an open in the INJ HS3 wire between the No. 3 cylinder injector and the injector control module.

15. Open wire check (INJ LS3 line)

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

    Test condition	Vehicle OFF (LOCK) mode
    	Injector control module connector C (12P): disconnected
    	PCM connector B (51P): disconnected
    	PCM connector C (51P): disconnected
    	Injector control module connector A (6P): disconnected
    	No. 3 cylinder injector 2P connector: disconnected
    Test circuit	INJ LS3
    Test point 1	No. 3 cylinder injector 2P connector No. 1 (GRN)
    Test point 2	Injector control module connector A (6P) No. 4 (GRN)

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    Is there continuity?

    YES 

    Replace the No. 3 cylinder injector .

    NO 

    Repair an open in the INJ LS3 wire between the No. 3 cylinder injector and the injector control module.

16. Shorted wire check (INJ Ti 3 line to power)

    -1. Turn the vehicle to the ON mode.

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

    Test condition	Vehicle ON mode
    	Injector control module connector C (12P): disconnected
    	PCM connector B (51P): disconnected
    	PCM connector C (51P): disconnected
    	Injector control module connector A (6P): disconnected
    Test circuit	INJ Ti 3
    Test point 1	Injector control module connector C (12P) No. 11 (BLU)
    Test point 2	Body ground

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    Is there any voltage?

    YES 

    Repair a short to power in the INJ Ti 3 wire between the PCM (B16) and the injector control module.

    NO 

    Go to step 17

17. Shorted wire check (INJF2 line to power)

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

    Test condition	Vehicle ON mode
    	Injector control module connector C (12P): disconnected
    	PCM connector B (51P): disconnected
    	PCM connector C (51P): disconnected
    	Injector control module connector A (6P): disconnected
    Test circuit	INJF2
    Test point 1	Injector control module connector C (12P) No. 5 (GRY)
    Test point 2	Body ground

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    Is there any voltage?

    YES 

    Repair a short to power in the INJF2 wire between the PCM (C18) and the injector control module.

    NO 

    Go to step 18.

18. Shorted wire check (INJ HS3 line to power)

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

    - 2. Disconnect the following connector.

    No. 3 cylinder injector 2P connector

    - 3. Turn the vehicle to the ON mode.

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

    Test condition	Vehicle ON mode
    	Injector control module connector C (12P): disconnected
    	PCM connector B (51P): disconnected
    	PCM connector C (51P): disconnected
    	Injector control module connector A (6P): disconnected
    	No. 3 cylinder injector 2P connector: disconnected
    Test circuit	INJ HS3
    Test point 1	Injector control module connector A (6P) No. 1 (BRN)
    Test point 2	Body ground

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    Is there any voltage?

    YES 

    Repair a short to power in the INJ HS3 wire between the No. 3 cylinder injector and the injector control module.

    NO 

    Go to step 19

19. Shorted wire check (INJ LS3 line to power)

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

    Test condition	Vehicle ON mode
    	Injector control module connector C (12P): disconnected
    	PCM connector B (51P): disconnected
    	PCM connector C (51P): disconnected
    	Injector control module connector A (6P): disconnected
    	No. 3 cylinder injector 2P connector: disconnected
    Test circuit	INJ LS3
    Test point 1	Injector control module connector A (6P) No. 4 (GRN)
    Test point 2	Body ground

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    Is there any voltage?

    YES 

    Repair a short to power in the INJ LS3 wire between the No. 3 cylinder injector and the injector control module.

    NO 

    Go to step 20

20. Shorted wire check (INJ Ti 3 line to ground)

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

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

    Test condition	Vehicle OFF (LOCK) mode
    	Injector control module connector C (12P): disconnected
    	PCM connector B (51P): disconnected
    	PCM connector C (51P): disconnected
    	Injector control module connector A (6P): disconnected
    	No. 3 cylinder injector 2P connector: disconnected
    Test circuit	INJ Ti 3
    Test point 1	Injector control module connector C (12P) No. 11 (BLU)
    Test point 2	Body ground

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    Is there continuity?

    YES 

    Repair a short to ground in the INJ Ti 3 wire between the PCM (B16) and the injector control module.

    NO 

    Go to step 21

21. Shorted wire check (INJF2 line to ground)

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

    Test condition	Vehicle OFF (LOCK) mode
    	Injector control module connector C (12P): disconnected
    	PCM connector B (51P): disconnected
    	PCM connector C (51P): disconnected
    	Injector control module connector A (6P): disconnected
    	No. 3 cylinder injector 2P connector: disconnected
    Test circuit	INJF2
    Test point 1	Injector control module connector C (12P) No. 5 (GRY)
    Test point 2	Body ground

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    Is there continuity?

    YES 

    Repair a short to ground in the INJF2 wire between the PCM (C18) and the injector control module.

    NO 

    Go to step 22.

22. Shorted wire check (INJ HS3 line to ground)

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

    Test condition	Vehicle OFF (LOCK) mode
    	Injector control module connector C (12P): disconnected
    	PCM connector B (51P): disconnected
    	PCM connector C (51P): disconnected
    	Injector control module connector A (6P): disconnected
    	No. 3 cylinder injector 2P connector: disconnected
    Test circuit	INJ HS3
    Test point 1	Injector control module connector A (6P) No. 1 (BRN)
    Test point 2	Body ground

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    Is there continuity?

    YES 

    Repair a short to ground in the INJ HS3 wire between the No. 3 cylinder injector and the injector control module.

    NO 

    Go to step 23

23. Shorted wire check (INJ LS3 line to ground)

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

    Test condition	Vehicle OFF (LOCK) mode
    	Injector control module connector C (12P): disconnected
    	PCM connector B (51P): disconnected
    	PCM connector C (51P): disconnected
    	Injector control module connector A (6P): disconnected
    	No. 3 cylinder injector 2P connector: disconnected
    Test circuit	INJ LS3
    Test point 1	Injector control module connector A (6P) No. 4 (GRN)
    Test point 2	Body ground

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    Is there continuity?

    YES 

    Repair a short to ground in the INJ LS3 wire between the No. 3 cylinder injector and the injector control module.

    NO 

    Go to step 24

24. Shorted wire check (INJ HS4 line to power)

    -1. Disconnect the following connectors.

    No. 4 cylinder injector 2P connector

    Injector control module connector B (6P)

    - 2. Turn the vehicle to the ON mode.

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

    Test condition	Vehicle ON mode
    	Injector control module connector C (12P): disconnected
    	PCM connector B (51P): disconnected
    	PCM connector C (51P): disconnected
    	Injector control module connector A (6P): disconnected
    	No. 3 cylinder injector 2P connector: disconnected
    	No. 4 cylinder injector 2P connector: disconnected
    	Injector control module connector B (6P): disconnected
    Test circuit	INJ HS4
    Test point 1	Injector control module connector B (6P) No. 3 (BRN)
    Test point 2	Body ground

    Courtesy of HONDA, U.S.A., INC.

    Is there any voltage?

    YES 

    Repair a short to power in the INJ HS4 wire between the No. 4 cylinder injector and the injector control module.

    NO 

    Substitute a known-good injector control module , then recheck. If the DTC P0203 goes away and the injector control module was substituted, replace the original injector control module .