Data Link Connector: Testing and Inspection

DLC Circuit Troubleshooting

NOTE: Make sure the HDS and the HDS DLC cable are not defective.

1. Turn the ignition switch to LOCK (0).

2. Connect the HDS to the DLC. Initial Inspection and Diagnostic Overview
NOTE: Make sure the HDS is properly connected to the DLC.

3. Turn the ignition switch to ON (II), and read the HDS.

Does the HDS identify the vehicle?
YES - Go to step 4.

NO - Go to step 25.


4. Check for Pending or Confirmed DTCs in the PGM-FI system with the HDS.

Are any Pending or Confirmed DTCs indicated?
YES - Go to the indicated DTC's troubleshooting.

NO -
- If the HDS does not communicate with the SRS, go to step 5.

- If the HDS does not communicate with the VSA system, go to step 7.

- If the HDS does not communicate with the ABS, go to step 9.

- If the HDS does not communicate with the EPS system, go to step 11.

- If the HDS does not communicate with the TPMS, go to step 13.

- If the HDS does not communicate with the IMMOBI (immobilizer) system, go to step 15.

- If the HDS does not communicate with the BODY ELECTRICAL system, go to step 17.



5. Turn the ignition switch to LOCK (0).

6. Turn the ignition switch to ON (II), and watch the SRS indicator.

Does the SRS indicator come on and go off?
YES - Go to step 17.

NO - Go to the SRS symptom troubleshooting for SRS indicator stays on, but no DTC are stored. Symptom Troubleshooting


7. Turn the ignition switch to LOCK (0).

8. Turn the ignition switch to ON (II), and watch the VSA indicator.

Does the VSA indicator come on and go off?
YES - Go to step 17.

NO - Go to the VSA system symptom troubleshooting for ABS indicator, brake system indicator, and VSA indicator do not go off. Symptom Troubleshooting


9. Turn the ignition switch to LOCK (0).

10. Turn the ignition switch to ON (II), and watch the ABS indicator.

Does the ABS indicator come on and go off?
YES - Go to step 17.

NO - Go to the ABS symptom troubleshooting for ABS indicator and brake system indicator do not go off. ABS Indicator And Brake System Indicator Do Not Go Off


11. Turn the ignition switch to LOCK (0).

12. Start the engine, and watch the EPS indicator.

Does the EPS indicator come on and go off?
YES - Go to step 17.

NO - Go to the EPS system symptom troubleshooting for EPS indicator does not go off, and no DTCs are stored. Symptom Troubleshooting


13. Turn the ignition switch to LOCK (0).

14. Turn the ignition switch to ON (II), and watch the TPMS indicator.

Does the TPMS indicator stay on?
YES - Go to the TPMS general troubleshooting information. Initial Inspection and Diagnostic Overview

NO - Go to step 17.


15. Turn the ignition switch to LOCK (0).

16. Turn the ignition switch to ON (II), and watch the immobilizer indicator.

Does the immobilizer indicator stay on or flash?
YES - Go to the immobilizer system troubleshooting. Description and Operation

NO - Go to step 17.


17. Do the gauge self-diagnostic function. Initial Inspection and Diagnostic Overview

18. Check the gauge display.

Is Error 2 indicated?
YES - Check for B-CAN system DTCs. Initial Inspection and Diagnostic Overview

NO - Go to step 19.


19. Turn the ignition switch to LOCK (0), then do the battery terminal disconnection procedure, Procedures and wait at least 3 minutes before starting work.

20. Disconnect the HDS from the DLC.

21. Check for continuity between DLC terminal No. 7 and body ground.

Is there continuity?
YES - Go to step 22.

NO - Go to step 23.






22. Continue to check for continuity between DLC terminal No. 7 and body ground, while disconnecting these connectors, one at a time:
- SRS unit connector A (39P)

- ABS modulator-control unit 25P connector (with ABS)

- VSA modulator-control unit 36P connector (with VSA system)

- EPS control unit connector A (11P)

- TPMS control unit 20P connector

- Immobilizer-keyless control unit 7P connector

- Audio unit 24P connector

- Under-dash fuse/relay box Q (16P) connector

Does continuity go away when one of the above parts is disconnected?
YES - Replace the part that caused continuity to go away when it was disconnected.

NO - Repair short in the wire between the DLC (K-line) and the ABS modulator-control unit (with ABS), the VSA modulator-control unit (with VSA system), the SRS unit, the EPS control unit, the TPMS control unit, the immobilizer-keyless control unit, the audio unit, the under-dash fuse/relay box, or the ECM/PCM.


23. Connect DLC terminal No. 7 to body ground with a jumper wire.






24. Check for continuity between body ground and these connector terminals:





Is there continuity between the DLC terminal and each of the terminals in the chart?
YES - Replace the part that does not communicate with the HDS.

NO - Repair open in the wire between the DLC (K-line) and the appropriate connector.


25. Do the gauge self-diagnostic function. Initial Inspection and Diagnostic Overview

Is Error 1 indicated?
YES - Go to step 38.

NO - Go to step 26.


26. Turn the ignition switch to LOCK (0).

27. Disconnect the HDS from the DLC.

28. Measure the voltage between DLC terminal No. 16 and body ground.

Is there battery voltage?
YES - Go to step 29.

NO - Repair open in the wire between DLC terminal No. 16 and the No. 1 BACK UP (10 A) fuse in the under-dash fuse/relay box.






29. Measure the voltage between DLC terminals No. 4 and No. 16.

Is there battery voltage?
YES - Go to step 30.

NO - Repair open in the wire between DLC terminal No 4 and body ground (G502).






30. Connect the HDS to the DLC. Initial Inspection and Diagnostic Overview

31. Jump the SCS line with the HDS.

32. Disconnect ECM/PCM connector A (49P).

33. Disconnect the HDS from the DLC.

34. Connect DLC terminal No. 6 to body ground with a jumper wire.






35. Check for continuity between ECM/PCM connector terminal A3 and body ground.

Is there continuity?
YES - Go to step 36.

NO - Repair open in the wire between the ECM/PCM (A3) and DLC terminal No. 6.






36. Connect DLC terminal No. 14 to body ground with a jumper wire.






37. Check for continuity between ECM/PCM connector terminal A4 and body ground.

Is there continuity?
YES - Update the ECM/PCM if it does not have the latest software, ECM/PCM Update or substitute a known-good ECM/PCM, Initial Inspection and Diagnostic Overview then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM. Service and Repair

NO - Repair open in the wire between the ECM/PCM (A4) and DLC terminal No. 14.






38. Try to start the engine.

Does the engine start and idle smoothly?
YES - Go to the F-CAN circuit troubleshooting. F-CAN Circuit Troubleshooting

NO - Go to step 39.


39. Turn the ignition switch to LOCK (0).

40. Check the No. 60 IG MAIN (50 A) fuse in the under-dash fuse/relay box.

Is the fuse OK?
YES - Repair open in the wire the No. 60 IG MAIN (50 A) fuse and the ignition switch. If the wire is OK go to step 41.

NO - Repair short in the wire between the No. 60 IG MAIN (50 A) fuse and the under-dash fuse/relay box. Also replace the No. 60 IG MAIN (50 A) fuse.


41. Inspect the No. 39 IGP (15 A) fuse in the under-dash fuse/relay box.

Is the fuse OK?
YES - Go to step 48.

NO - Go to step 42.


42. Remove the blown No. 39 IGP (15 A) fuse from the under-hood fuse/relay box.

43. Open the fuse access panel (A), then remove the PGM-FI main relay 1 (B) from the under-dash fuse/relay box.






44. Check for continuity between body ground and PGM-FI main relay 1 4P connector terminals No. 2 and No. 3 individually.

Is there continuity?
YES - Replace the under-dash fuse/relay box. Under-Dash Fuse/Relay Box Removal And Installation (USA Models)

NO - Go to step 45.






45. While disconnecting each of the parts or connectors below, one at a time, check for continuity between PGM-FI main relay 1 4P connector terminal No. 1 and body ground.
- PGM-FI main relay 2

- ECM/PCM connector A (49P)

- Each injector 2P connector

- Camshaft position (CMP) sensor 3P connector

- Crankshaft position (CKP) sensor 3P connector

- Electronic throttle control system (ETCS) control relay

Does continuity go away when one of the above parts is disconnected?
YES - Replace the part that made the short to body ground go away when disconnected. If the part is the ECM/PCM, update the ECM/PCM if it does not have the latest software, ECM/PCM Update or substitute a known-good ECM/PCM, Initial Inspection and Diagnostic Overview then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM. Service and Repair Also replace the No. 39 IGP (15 A) fuse.

NO - Go to step 46.






46. Disconnect these parts or connectors:
- PGM-FI main relay 2

- ECM/PCM connector A

- Injectors

- Camshaft position (CMP) sensor

- Crankshaft position (CKP) sensor

- Electronic throttle control system (ETCS) control relay

47. Check for continuity between PGM-FI main relay 1 4P connector terminal No. 1 and body ground.

Is there continuity?
YES - Repair short in the wire between PGM-FI main relay 1 and each part. Also replace the No. 39 IGP (15 A) fuse.

NO - Replace PGM-FI main relay 1. Also replace the No. 39 IGP (15 A) fuse.






48. Inspect the No. 20 FUEL PUMP (15 A) fuse in the under-dash fuse/relay box.

Is the fuse OK?
YES - Go to step 58.

NO - Go to step 49.


49. Remove the blown No. 20 FUEL PUMP (15 A) fuse from the under-dash fuse/relay box.

50. Jump the SCS line with the HDS.

51. Disconnect ECM/PCM connector C (49P).

52. Check for continuity between ECM/PCM connector terminal C10 and body ground.

Is there continuity?
YES - Go to step 53.

NO - Replace the No. 20 FUEL PUMP (15 A) fuse, and update the ECM/PCM if it does not have the latest software, ECM/PCM Update or substitute a known-good ECM/PCM, Initial Inspection and Diagnostic Overview then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM. Service and Repair






53. Open the fuse access panel (A), then remove the PGM-FI main relay 2 (B) from the under-dash fuse/relay box.






54. Check for continuity between ECM/PCM connector terminal C10 and body ground.

Is there continuity?
YES - Repair short in the wire between the No. 20 FUEL PUMP (15 A) fuse and the ECM/PCM (C10) or PGM-FI main relay 2. Also replace the No. 20 FUEL PUMP (15 A) fuse.

NO - Go to step 55.






55. Disconnect the fuel pump 4P connector. Fuel Tank Unit Removal and Installation

56. Check for continuity between fuel pump 4P connector terminal No. 2 and body ground.

Is there continuity?
YES - Repair short in the wire between the fuel pump and PGM-FI main relay 2. Also replace the No. 20 FUEL PUMP (15 A) fuse.

NO - Go to step 57.






57. Test PGM-FI main relay 2. Testing and Inspection

Is the relay OK?
YES - Check the fuel pump, and replace it if needed. Fuel Pump/Fuel Gauge Sending Unit Replacement Also replace the No. 20 FUEL PUMP (15 A) fuse.

NO - Replace PGM-FI main relay 2. Also replace the No. 20 FUEL PUMP (15 A) fuse.


58. Jump the SCS line with the HDS.

59. Disconnect ECM/PCM connectors A (49P) and C (49P).

60. Turn the ignition switch to ON (II).

61. Measure the voltage between ECM/PCM connector terminal C10 and body ground.

Is there battery voltage?
YES - Go to step 62.

NO - Repair open in the wire between the No. 20 FUEL PUMP (15 A) fuse and the ECM/PCM (C10).






62. Measure the voltage between ECM/PCM connector terminal A7 and body ground.

Is there battery voltage?
YES - Go to step 68.

NO - Go to step 63.






63. Turn the ignition switch to LOCK (0).

64. Open the fuse access panel (A), then remove the PGM-FI main relay 1 (B) from the under-dash fuse/relay box.






65. Measure the voltage between PGM-FI main relay 1 4P connector terminal No. 3 and body ground.

Is there battery voltage?
YES - Go to step 66.

NO - Replace the under-dash fuse/relay box. Under-Dash Fuse/Relay Box Removal And Installation (USA Models)






66. Connect PGM-FI main relay 1 4P connector terminal No. 4 to body ground with a jumper wire.






67. Check for continuity between ECM/PCM connector terminal A7 and body ground.

Is there continuity?
YES - Test PGM-FI main relay 1. Testing and Inspection If the relay is OK, update the ECM/PCM if it does not have the latest software, ECM/PCM Update or substitute a known-good ECM/PCM, Initial Inspection and Diagnostic Overview then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM. Service and Repair

NO - Repair open in the wire between the ECM/PCM (A7) and PGM-FI main relay 1.






68. Turn the ignition switch to LOCK (0).

69. Open the fuse access panel (A), then remove the PGM-FI main relay 1 (B) from the under-dash fuse/relay box.






70. Measure the voltage between PGM-FI main relay 1 4P connector terminal No. 2 and body ground.

Is there battery voltage?
YES - Go to step 71.

NO - Replace the under-dash fuse/relay box. Under-Dash Fuse/Relay Box Removal And Installation (USA Models)






71. Connect PGM-FI main relay 1 4P connector terminal No. 1 to body ground with a jumper wire.






72. Check for continuity between ECM/PCM connector terminal A9 and body ground.

Is there continuity?
YES - Go to step 73.

NO - Repair open in the wire between the ECM/PCM (A9) and PGM-FI main relay 1.






73. Test PGM-FI main relay 1. Testing and Inspection

Is PGM-FI main relay 1 OK?
YES - Go to step 74.

NO - Replace PGM-FI main relay 1.


74. Disconnect ECM/PCM connector B (49P).

75. Check for continuity between body ground and ECM/PCM connector terminals B1, B10, C2, C44, and C48 individually.

Is there continuity?
YES - Go to step 76.

NO - Repair open in the wire between the ECM/PCM (B1, B10, C2, C44, C48) and G101.






76. Check for continuity between ECM/PCM connector terminal C13 and body ground.

Is there continuity?
YES - Go to step 77.

NO - Go to step 78.






77. Continue to check for continuity between ECM/PCM connector terminal C13 and body ground, while disconnecting these connectors, one at a time:
- MAP sensor 3P connector

- Output shaft (countershaft) speed sensor 3P connector

Does continuity go away when one of the above parts is disconnected?
YES - Replace the part that caused continuity to go away when it was disconnected.

NO - Repair short in the wire between the ECM/PCM (C13) and the MAP sensor or the output shaft (countershaft) speed sensor.


78. Check for continuity between ECM/PCM connector terminal B19 and body ground.

Is there continuity?
YES - Go to step 79.

NO - Go to step 80.






79. Continue to check for continuity between ECM/PCM connector terminal B19 and body ground, while disconnecting these connectors, one at a time:
- EGR valve 6P connector

- Input shaft (mainshaft) speed sensor 3P connector

Does continuity go away when one of the above parts is disconnected?
YES - Replace the part that caused continuity to go away when it was disconnected.

NO - Repair short in the wire between the ECM/PCM (B19) and the EGR valve or the input shaft (mainshaft) speed sensor.


80. Check for continuity between ECM/PCM connector terminal C12 and body ground.

Is there continuity?
YES - Go to step 81.

NO - Go to step 82.






81. Continue to check for continuity between ECM/PCM connector terminal C12 and body ground, while disconnecting the throttle body 6P connector.

Is there continuity?
YES - Repair short in the wire between the ECM/PCM (C12) and the throttle body.

NO - Replace the throttle body. Removal and Replacement


82. Check for continuity between ECM/PCM connector terminal A26 and body ground.

Is there continuity?
YES - Go to step 83.

NO - Go to step 84.






83. Continue to check for continuity between ECM/PCM connector terminal A26 and body ground, while disconnecting the APP sensor 6P connector.

Is there continuity?
YES - Repair short in the wire between the ECM/PCM (A26) and APP sensor A.

NO - Replace the accelerator pedal module. Service and Repair


84. Check for continuity between ECM/PCM connector terminal A25 and body ground.

Is there continuity?
YES - Go to step 85.

NO - Go to step 86.






85. Continue to check for continuity between ECM/PCM connector terminal A25 and body ground, while disconnecting the APP sensor 6P connector.

Is there continuity?
YES - Repair short in the wire between the ECM/PCM (A25) and APP sensor B.

NO - Replace the accelerator pedal module. Service and Repair


86. Check for continuity between ECM/PCM connector terminal A20 and body ground.

Is there continuity?
YES - Go to step 87.

NO - Update the ECM/PCM if it does not have the latest software, ECM/PCM Update or substitute a known-good ECM/PCM, Initial Inspection and Diagnostic Overview then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM. Service and Repair






87. Continue to check for continuity between ECM/PCM connector terminal A20 and body ground, while disconnecting the FTP sensor 3P connector.

Is there continuity?
YES - Repair short in the wire between the ECM/PCM (A20) and the FTP sensor.

NO - Replace the FTP sensor. Service and Repair