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Home >> Honda >> 2013 >> CR-Z Base, Automatic CVT Trans >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> IMA System >> DTC Troubleshooting >> DTC P15C4: Auto Idle Stop System Malfunction (M/T model)

DTC P15C4: Auto Idle Stop System Malfunction (M/T model)

NOTE:
  • Before you troubleshoot, record all freeze data, and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION  ).
  • If the DTC cannot be cleared, do the troubleshooting for DTC U1204.
  • This DTC is stored when the auto idle stop is prohibited due to failure.
  1. Check the AUTO IDLE STOP DOES NOT OCCUR (BRAKE) in the PGM-FI SYSTEM DATA LIST with the HDS.

    Does the HDS indicate EXIST? 

    YES  -Go to the brake booster pressure monitoring system's general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ). When the brake booster pressure monitoring system troubleshooting is completed, reset the ECM (see IF THE MIL DID NOT STAY ON ) then clear the DTC in the IMA system (see DTC CLEAR  ).

    NO  -Go to step  2.

  2. Check the AUTO IDLE STOP DOES NOT OCCUR (A/C) in the PGM-FI SYSTEM DATA LIST with the HDS.

    Does the HDS indicate EXIST? 

    YES  -Go to the climate control system's general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ). When the climate control system troubleshooting is completed, reset the ECM (see IF THE MIL DID NOT STAY ON ) then clear the DTC in the IMA system (see DTC CLEAR  ).

    NO  -Go to step  3.

  3. Check the AUTO IDLE STOP DOES NOT OCCUR (NP SWITCH) in the PGM-FI SYSTEM DATA LIST with the HDS.

    Does the HDS indicate EXIST? 

    YES  -Go to step  5.

    NO  -Go to step  4.

  4. Check the AUTO IDLE STOP DOES NOT OCCUR (CLUTCH PEDAL POSITION SWITCH) in the PGM-FI SYSTEM DATA LIST with the HDS.

    Does the HDS indicate EXIST? 

    YES  -Go to step  26.

    NO  -Intermittent failure, the system is OK at this time. Reset the ECM (see IF THE MIL DID NOT STAY ON ), then clear the DTC in the IMA system (see DTC CLEAR  ).

  5. Check the NP SWITCH in the PGM-FI DATA LIST with the HDS.

    Does the HDS indicate ON when you move the shift lever to neutral, and does it indicate OFF when you move the shift lever to 1st or 2nd gear? 

    YES  -Intermittent failure, the neutral position switch is OK at this time. Reset the ECM (see IF THE MIL DID NOT STAY ON ), and clear the DTC in the IMA system (see DTC CLEAR  ).

    NO  -

    • If the neutral position switch stays ON, go to step  6.
    • If the neutral position switch stays OFF, go to step  13.
    • If the indication is unstable, check the neutral position switch and the shift arm condition (see CHANGE LEVER ASSEMBLY DISASSEMBLY/REASSEMBLY ), then go to step  67.
  6. Turn the ignition switch to LOCK (0).
  7. Disconnect the neutral position switch 2P connector.
  8. Check the NP SWITCH in the PGM-FI DATA LIST with the HDS with the shift lever in neutral.

    Does the NP SWITCH indicate OFF? 

    YES  -Replace the neutral position switch (see NEUTRAL POSITION SWITCH REPLACEMENT ), then go to step  67.

    NO  -Go to step  9.

  9. Turn the ignition switch to LOCK (0).
  10. Jump the SCS line with the HDS.
  11. Disconnect ECM connector B (44P).
  12. Check for continuity between neutral position switch 2P connector terminal No. 2 and body ground.
    Fig 1: Checking Continuity Between Neutral Position Switch 2P Connector Terminal No. 2 And Body Ground
    G06950447Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair a short in the wire between the ECM (B13 and B21) and the neutral position switch, then go to step  67.

    NO  -Update the ECM if it does not have the latest software (see ELD REPLACEMENT ), then recheck. If the ECM was updated, replace the original ECM (see ECM/PCM REPLACEMENT ), then recheck.

  13. Turn the ignition switch to ON (II).
  14. Disconnect the neutral position switch 2P connector.
  15. Connect neutral position switch 2P connector terminal No. 2 to body ground with a jumper wire.
    Fig 2: Identifying Jumper Wire Connector With Neutral Position Switch 2P Connector Terminal No. 2 To Body Ground
    G06950448Courtesy of AMERICAN HONDA MOTOR CO., INC.
  16. Check the NP SWITCH in the PGM-FI DATA LIST with the HDS.

    Does the HDS indicate ON? 

    YES  -Go to step  17.

    NO  -Go to step  21.

  17. Disconnect the jumper wire from the neutral position switch 2P connector.
  18. Turn the ignition switch to ON (II).
  19. Connect neutral position switch 2P connector terminals No. 1 and No. 2 with a jumper wire.
    Fig 3: Identifying Jumper Wire Connection With Neutral Position Switch 2P Connector Terminals No. 1 And No. 2 With A Jumper Wire
    G06950449Courtesy of AMERICAN HONDA MOTOR CO., INC.
  20. Check the NP SWITCH in the PGM-FI DATA LIST with the HDS with the shift lever in neutral.

    Does the HDS indicate OFF? 

    YES  -Repair an open in the wire between the neutral position switch and G101 (see CKP SENSOR SUBHARNESS (CVT) (JA) ), then go to step  67.

    NO  -Replace the neutral position switch (see NEUTRAL POSITION SWITCH REPLACEMENT ), then go to step  67.

  21. Disconnect the jumper wire from the neutral position switch 2P connector.
  22. Turn the ignition switch to LOCK (0).
  23. Jump the SCS line with the HDS.
  24. Disconnect ECM connector B (44P).
  25. Check for continuity between these terminals:
    • ECM connector terminal B13 and neutral position switch 2P connector terminal No. 2.
    • ECM connector terminal B21 and neutral position switch 2P connector terminal No. 2.
      Fig 4: Checking Continuity Between ECM Connector Terminal B13 And Neutral Position Switch 2P Connector Terminal No. 2
      G06950450Courtesy of AMERICAN HONDA MOTOR CO., INC.

      Is there continuity? 

      YES  -Update the ECM if it does not have the latest software (see ELD REPLACEMENT ), then recheck. If the ECM was updated, replace the original ECM (see ECM/PCM REPLACEMENT ), then recheck.

      NO  -Repair an open in the wire between the neutral position switch and the ECM (B13 or B21), then go to step  67.

  26. Check CLUTCH PEDAL POSITION SWITCH A and CLUTCH PEDAL POSITION SWITCH A (C) in the PGM-FI DATA LIST with the HDS.

    Do the HDS indicate CLOSE when the clutch pedal is pressed and OPEN when the clutch pedal is released? 

    YES  -Intermittent failure, the system is OK at this time. Reset the ECM (see IF THE MIL DID NOT STAY ON ), and clear the DTC in the IMA system (see DTC CLEAR  ).

    NO  -

    • If clutch pedal position switch A CLOSE stays on, go to step  27.
    • If clutch pedal position switch A OPEN stays on, go to step  34.
    • If clutch pedal position switch C CLOSE stays on, go to step  47.
    • If clutch pedal position switch C OPEN stays on, go to step  54.
    • If clutch pedal position switch A and clutch pedal position switch C OPEN stays on, repair an open in the wire between clutch pedal position switch A and C and G403 (see LEFT ENGINE COMPARTMENT WIRE HARNESS (BF) ), then go to step  67.
  27. Turn the ignition switch to LOCK (0).
  28. Disconnect the clutch pedal position switch A 2P connector.
  29. Check CLUTCH PEDAL POSITION SWITCH A in the PGM-FI DATA LIST with the HDS.

    Does the HDS indicate OPEN? 

    YES  -Replace clutch pedal position switch A (see CLUTCH PEDAL POSITION SWITCH REPLACEMENT ), then go to step  67.

    NO  -Go to step  30.

  30. Turn the ignition switch to LOCK (0).
  31. Jump the SCS line with the HDS.
  32. Disconnect ECM connector B (44P).
  33. Check for continuity between clutch pedal position switch A 2P connector terminal No. 1 and body ground.
    Fig 5: Checking Continuity Between Clutch Pedal Position Switch A 2P Connector Terminal No. 1 And Body Ground
    G06950451Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair a short in the wire between the ECM (B12) and clutch pedal position switch A, then go to step  67.

    NO  -Update the ECM if it does not have the latest software (see ELD REPLACEMENT ), then recheck. If the ECM was updated, replace the original ECM (see ECM/PCM REPLACEMENT ), then recheck.

  34. Turn the ignition switch to LOCK (0).
  35. Disconnect clutch pedal position switch A 2P connector.
  36. Connect clutch pedal position switch A 2P connector terminal No. 1 to body ground with jumper wire.
    Fig 6: Identifying Jumper Wire Connection With Clutch Pedal Position Switch A 2P Connector Terminal No. 1 To Body Ground
    G06950452Courtesy of AMERICAN HONDA MOTOR CO., INC.
  37. Check CLUTCH PEDAL POSITION SWITCH A in the PGM-FI DATA LIST with the HDS.

    Does the HDS indicate CLOSE? 

    YES  -Go to step  38.

    NO  -Go to step  42.

  38. Disconnect the jumper wire from the clutch pedal position switch A 2P connector.
  39. Turn the ignition switch to LOCK (0).
  40. Connect clutch pedal position switch A 2P connector terminals No. 1 and No. 2 with a jumper wire.
    Fig 7: Identifying Jumper Wire Connection With Clutch Pedal Position Switch A 2P Connector Terminals No. 1 And No. 2
    G06950453Courtesy of AMERICAN HONDA MOTOR CO., INC.
  41. Check CLUTCH PEDAL POSITION SWITCH A in the PGM-FI DATA LIST with the HDS.

    Does the HDS indicate OPEN? 

    YES  -Repair an open in the wire between clutch pedal position switch A and G403 (see LEFT ENGINE COMPARTMENT WIRE HARNESS (BF) ), then go to step  67.

    NO  -Replace clutch pedal position switch A (see CLUTCH PEDAL POSITION SWITCH REPLACEMENT ), then go to step  67.

  42. Disconnect the jumper wire from the clutch pedal position switch A 2P connector.
  43. Turn the ignition switch to LOCK (0).
  44. Jump the SCS line with the HDS.
  45. Disconnect ECM connector B (44P).
  46. Check for continuity between clutch pedal position switch A 2P connector terminal No. 1 and ECM connector terminal B12.
    Fig 8: Checking Continuity Between Clutch Pedal Position Switch A 2P Connector Terminal No. 1 And ECM Connector Terminal B12
    G06950454Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Update the ECM if it does not have the latest software (see ELD REPLACEMENT ), then recheck. If the ECM was updated, replace the original ECM (see ECM/PCM REPLACEMENT ), then recheck.

    NO  -Repair an open in the wire between clutch pedal position switch A and the ECM (B12), then go to step  67.

  47. Turn the ignition switch to LOCK (0).
  48. Disconnect the clutch pedal position switch C 2P connector.
  49. Check CLUTCH PEDAL POSITION SWITCH A (C) in the PGM-FI DATA LIST with the HDS.

    Does the HDS indicate OPEN? 

    YES  -Replace clutch pedal position switch C (see CLUTCH PEDAL POSITION SWITCH REPLACEMENT ), then go to step  67.

    NO  -Go to step  50.

  50. Turn the ignition switch to LOCK (0).
  51. Jump the SCS line with the HDS.
  52. Disconnect ECM connector B (44P).
  53. Check for continuity between clutch pedal position switch C 2P connector terminal No. 1 and body ground.
    Fig 9: Checking Continuity Between Clutch Pedal Position Switch C 2P Connector Terminal No. 1 And Body Ground
    G06950455Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair a short in the wire between the ECM (B39) and clutch pedal position switch C, then go to step  67.

    NO  -Update the ECM if it does not have the latest software (see ELD REPLACEMENT ), then recheck. If the ECM was updated, replace the original ECM (see ECM/PCM REPLACEMENT ), then recheck.

  54. Turn the ignition switch to LOCK (0).
  55. Disconnect the clutch pedal position switch C 2P connector.
  56. Connect clutch pedal position switch C 2P connector terminal No. 1 to body ground with a jumper wire.
    Fig 10: Identifying Jumper Wire Connection With Clutch Pedal Position Switch C 2P Connector Terminal No. 1 To Body Ground
    G06950456Courtesy of AMERICAN HONDA MOTOR CO., INC.
  57. Check CLUTCH PEDAL POSITION SWITCH A (C) in the PGM-FI DATA LIST with the HDS.

    Does the HDS indicate CLOSE? 

    YES  -Go to step  58.

    NO  -Go to step  62.

  58. Disconnect the jumper wire from the clutch pedal position switch C 2P connector.
  59. Turn the ignition switch to LOCK (0).
  60. Connect clutch pedal position switch C 2P connector terminals No. 1 and No. 2 with a jumper wire.
    Fig 11: Identifying Jumper Wire Connection With Clutch Pedal Position Switch C 2P Connector Terminals No. 1 And No. 2
    G06950457Courtesy of AMERICAN HONDA MOTOR CO., INC.
  61. Check CLUTCH PEDAL POSITION SWITCH A (C) in the PGM-FI DATA LIST with the HDS.

    Does the HDS indicate OPEN? 

    YES  -Repair an open in the wire between clutch pedal position switch C and G403 (see LEFT ENGINE COMPARTMENT WIRE HARNESS (BF) ), then go to step  67.

    NO  -Replace clutch pedal position switch C (see CLUTCH PEDAL POSITION SWITCH REPLACEMENT ), then go to step  67.

  62. Disconnect the jumper wire from the clutch pedal position switch C 2P connector.
  63. Turn the ignition switch to LOCK (0).
  64. Jump the SCS line with the HDS.
  65. Disconnect ECM connector B (44P).
  66. Check for continuity between clutch pedal position switch C 2P connector terminal No. 1 and ECM connector terminal B39.
    Fig 12: Checking Continuity Between Clutch Pedal Position Switch C 2P Connector Terminal No. 1 And ECM Connector Terminal B39
    G06950458Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Update the ECM if it does not have the latest software (see ELD REPLACEMENT ), then recheck. If the ECM was updated, replace the original ECM (see ECM/PCM REPLACEMENT ), then recheck.

    NO  -Repair an open in the wire between the clutch pedal position switch C and the ECM (B39), then go to step  67.

  67. Turn the ignition switch to LOCK (0).
  68. Reconnect all connectors.
  69. Turn the ignition switch to ON (II).
  70. Reset the ECM with the HDS (see IF THE MIL DID NOT STAY ON ).
    NOTE: If the ECM is not reset, DTC P15C4 is stored again.
  71. Clear the DTC with the HDS (see DTC CLEAR  ).
  72. Do the auto idle stop system inspection (see AUTO IDLE STOP SYSTEM TROUBLESHOOTING  ).
  73. Check for Pending or Confirmed DTCs with the HDS.

    Is DTC P15C4 indicated? 

    YES  -Check for poor connections or loose terminals at the ECM and clutch pedal position switches A and C. Also check for brake system and climate control system DTCs, then go to step  1.

    NO  -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC'S TROUBLESHOOTING .

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