Honda Fit/Jazz - How to Troubleshoot Fuel and Emissions Systems (5MT without ETCS)
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How to Troubleshoot Fuel and Emissions Systems
Intermittent Failures
The term ‘‘intermittent failure'' means a system may have had a failure, but it checks OK now. If the malfunction indicator lamp (MIL) on the dash does not come on, check for poor connections or loose terminals at all connectors related to the circuit that you are troubleshooting.
Opens and Shorts
‘‘Open'' and ‘‘Short'' are common electrical terms. An open is a break in a wire or at a connection. A short is an accidental connection of a wire to ground or to another wire. In simple electronics, this usually means something won't work at all. In complex electronics (like ECM's/PCM's) this can sometimes mean something works, but not the way it's supposed to.
How to Use the HDS or the Scan Tool
If the MIL has come on
1. | Start the engine and check the MIL (A). Do not puncture the insulation on a wire.Punctures can cause poor or intermittent electrical connections. |
ECM/PCM Updating and Substitution for Testing
Special Tools Required
Honda interface module((HIM) EQS05A35570)
Use this procedure when you have to substitute a known-good ECM/PCM in a troubleshooting procedure. Update the ECM/PCM only if the ECM/PCM does not already have the latest software loaded.
NOTE: Do not turn the ignition switch OFF while updating the ECM/PCM. If you turn the ignition switch OFF, the ECM/PCM can be damaged.
How to Update the ECM/PCM
NOTE:
- To ensure the latest program is installed, do an ECM/PCM update whenever the ECM/PCM is substituted or replaced.
- You cannot update an ECM/PCM with the program it already has. It will only accept a new program.
- Before you update the ECM/PCM, make sure the vehicle's battery is fully charged.
- To prevent ECM/PCM damage, do not operate anything electrical (audio system, brakes, A/C, power windows, door locks, etc.) during the update.
- If you need to diagnose the Honda interface module (HIM) because the HIM's red (#3) light came on or was flashing during the update, leave the ignition switch in the ON (II) position when you disconnect the HIM from the data link connector (DLC). This will prevent ECM/PCM damage.
1. | Turn the ignition switch ON (II). Do not start the engine. |
2. | Connect the Honda interface module (HIM) to the data link connector (DLC) (A) located under the driver's side of dashboard. |
3. | Do the ECM/PCM update procedure as described on the HIM label and in the ECM/PCM update system. If the software in the ECM/PCM is the latest, replace the ECM/PCM. |
How to Substitute the ECM/PCM
1. | Remove the ECM/PCM from the vehicle. |
2. | Install a known-good ECM/PCM in the vehicle. |
3. | Rewrite the immobilizer code with the ECM/PCM replacement procedure in the HDS: It allows you to start the engine. |
4. | After completing your tests, reinstall the original ECM/PCM and rewrite the immobilizer code with the ECM/PCM replacement procedure in the HDS again. |
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