Honda Fit/Jazz - MIL Circuit Troubleshooting
MIL Circuit Troubleshooting
| 1. | Connect a scan tool/Honda PGM Tester.
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| 2. | Turn the ignition switch ON (II) and read the scan tool/Honda PGM Tester.
Does the scan tool/Honda PGM Tester communicate with the ECM/PCM?
YES - Go to Substitute a known-good ECM/PCM and recheck. If the symptom/indication goes away, replace the original ECM/PCM.n
NO - Check for an open in the wires between the ECM/PCM (E31) and the gauge assembly. Also check for a blown MIL bulb. If the wires and the bulb are OK, replace the gauge assembly.n
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| 21. | Turn the ignition switch OFF.
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| 22. | Inspect the No. 20 (15A) fuse in the under-dash fuse/relay box.
Is the fuse OK?
YES - Go to substitute a known-good ECM/PCM and recheck.
If the symptom/indication goes away, replace the original ECM/PCM.
Also replace the No. 20 (15A) fuse.n
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| 28. | Disconnected the connectors of all following items.
- PGM-FI main relay 2
- ECM/PCM connector A (31P)
- Injectors
- Idle air control (IAC) valve
- Top dead center (TDC) sensor
- Crankshaft position (CKP) sensor
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| 29. | Check for continuity between PGM-FI main relay 1 4P connector terminals No. 1 and body ground.
substitute a known-good ECM/PCM and recheck. If the symptom/indication goes away, replace the original ECM/PCM.n
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| 35. | Remove the driver's side under cover.
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| 36. | Remove the relay holder (A) from the under-dash fuse/relay box, and remove the PGM-FI main relay 2, (blue) (B) from the relay holder (A), after reinstall the relay holder (A) to the under-dash fuse/relay box.
substitute a known-good ECM/PCM and recheck. If the symptom/indication goes away, replace the original ECM/PCM.n
NO - Repair open in the wire between PGM-FI main relay 1 and the ECM/PCM (E7).n |
| 53. | Reconnect ECM/PCM connector E (31P).
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| 54. | Reconnect the negative cable from the battery.
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| 55. | Turn the ignition switch ON (II).
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| 56. | Measure voltage between body ground and ECM/PCM connector terminals A2 and A3 individually.
Substitute a known-good ECM/PCM and recheck. If the symptom/indication goes away, replace the original ECM/PCM.n
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| 73. | Measure voltage between body ground and ECM/PCM connector terminals A20.
Substitute a known-good ECM/PCM and recheck. If the symptom/indication goes away, replace the original ECM/PCM.n
NO - Go to Substitute a known-good ECM/PCM and recheck. If symptom/indication goes away, replace the original ECM/PCM.n
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| 81. | Turn the ignition switch OFF.
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| 82. | Turn the ignition switch ON (II).
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| 83. | Measure voltage between ECM/PCM connector terminal E29 and body ground.
Substitute a known-good ECM/PCM and recheck. If symptom/indication goes away, replace the original ECM/PCM.n
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| 88. | Turn the ignition switch OFF.
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| 89. | Disconnect the negative cable from the battery.
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| 90. | Disconnect the ECM/PCM connector E (31P).
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| 91. | Reconnect the negative cable from the battery.
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| 92. | Turn the ignition ON (II).
Is the MIL ON?
YES - Repair short in the wire between the gauge assembly and the ECM/PCM (E31). If the wires are OK, replace the gauge assembly.n
NO - Substitute a known-good ECM/PCM and recheck. If symptom/indication goes away, replace the original ECM/PCM.n
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Honda Fit/Jazz 02-05 Workshop Manual
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