Recent Posts
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Honda Jazz Mk4 2020 - / Re: Anyone Had 12v Issues?
« Last post by John Ratsey on January 21, 2025, 06:08:56 PM »The point is about the voltage needed to boot the regulators powering the microprocessors and thus enable the HV relays to be connected to and control the motor. If the car does start on 10V that is interesting information.I find the 10V threshold implausible. I had an interesting experience with my HR-V after it had been standing for the better part of two months. The car unlocked as usual, the power button worked but the dashboard then filled with warning symbols and error messages telling me that numerous features weren't working. The screen in the middle of the dashboard didn't power up and I concluded that there wasn't enough life in the battery to close the contactor to connect the HV battery. There was no other indication that the 12V battery was low.
IIRC the 12V battery measured over 12V on my volt meter. I connected my smart charger which, after less than a minute claimed the battery was fully charged (which it obviously wasn't). Fortunately I had an old dumb charger which pushed some juice into the battery after which everything was OK and the vehicle started normally. It's possible that the 12V battery isn't in the best of health as two years ago it had a dose of the HR-V's flat battery problem (when a software bug randomly didn't power down everything when the doors were locked).
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Honda Jazz Mk4 2020 - / Re: Jazz Hybrid Brake Problem
« Last post by Tombola on January 21, 2025, 04:29:15 PM »First problem, Have you enabled the adjustable speed limiter or active cruise control when driving? also check the "Collision Mitigation Braking System" (CBMS) settings, Far-Normal-Near. Second problem, try driving off without manually releasing the parking brake, it should release automatically
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Honda Jazz Mk3 2015 - 2020 / Re: Tyre deflation false alarms
« Last post by Kremmen on January 21, 2025, 04:18:13 PM »I've always found that as all tyres seasonally inflate or deflate the TPMS does not trigger as the rotational comparison is the same
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Honda Jazz Mk3 2015 - 2020 / Re: Tyre deflation false alarms
« Last post by Toptek on January 21, 2025, 03:59:44 PM »Had the misfortune of driving over broken wheel trim fragments beside the wheel trim yesterday . About 10 minutes into the trip the light came on, as we were out I could only do a visual check until today. It turns out all tyres were down to about 26 psi but looking fine.
I took it to the petrol station for a speedy resolution and it didn't take long per tyre to be up to pressure.
I have the diamond cut alloys and had a fast slow puncture on one wheel which was repaired last April (I think).
I'm going to pay more attention to this now. Similarly, I might purchase one of those battery operated inflators.
I took it to the petrol station for a speedy resolution and it didn't take long per tyre to be up to pressure.
I have the diamond cut alloys and had a fast slow puncture on one wheel which was repaired last April (I think).
I'm going to pay more attention to this now. Similarly, I might purchase one of those battery operated inflators.
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Honda Jazz Mk4 2020 - / Jazz Hybrid Brake Problem
« Last post by GLENJON on January 21, 2025, 02:54:47 PM »Hi All Two problems I have one travelling at 40/50 mph the brakes put themselves on until you lift off the accelerator it clears then comes on after a short distance again and keeps on doing this until it clears . Second problem Parking Brake will not come off so cannot get the brakes off .Only way we have got them off is to drive the car a short distance with the brakes on not ideal and hope they come off sometimes yes sometime not. Both problems been with Honda dealers no fault found 
. any suggestions Thanks John
. any suggestions Thanks John26
Honda Jazz Mk4 2020 - / Re: Anyone Had 12v Issues?
« Last post by 5thcivic on January 21, 2025, 02:11:41 PM »The point is about the voltage needed to boot the regulators powering the microprocessors and thus enable the HV relays to be connected to and control the motor. If the car does start on 10V that is interesting information.
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New Members / Re: Hello Everyone
« Last post by Beanbag on January 21, 2025, 01:31:56 PM »Hello Melody , Welcome. We have a 1.3 sport
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Honda Jazz Mk1 2002-2008 / Re: Missfire? question Jazz 2005 CVT
« Last post by Lord Voltermore on January 21, 2025, 11:45:53 AM »Could it be coil packs, power supply to coil packs or a plug lead from coil to plug? Might be worth checking connections for any sign of being loose, or dirty/corroded terminals . The obd reading might be able to show which particular plug is misfiring which might speed up diagnosis . But I dont know to what extent it can identify which particular component is causing it.
But my knowledge of cars with an ECU is limited. Please dont replace expensive parts on my suggestion alone.
But my knowledge of cars with an ECU is limited. Please dont replace expensive parts on my suggestion alone.
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Honda Jazz Mk4 2020 - / Re: Mpg not very good.
« Last post by Lord Voltermore on January 21, 2025, 11:21:00 AM »aphybrid's graph shows the effects of the cold very graphically, with a low of about 45 mpg. The effect of cold weather is particularly noticeable in Hybrids, and in the range of full EV's but I think conventional ICE cars suffer too , but maybe less often carefully monitored by owners. Everything is stacked against you. Not only a cold engine, the need for more lights, heating, demisting, reduced battery efficiency but also cold air is denser increasing wind resistance.
Although I am very happy with the mpg of my mk4 my previous diesel cars (a Yaris and a corsa) could get close on a good day. But I am so pleased with the relative silence, ease of driving and other advantages of the hybrid system and transmission, that I would still favour it even if fuel consumption were higher. Its a bonus that its not. (sorry if this is environmentally selfish
) A few years ago I was attracted by the claimed mpg of some of the new 1 litre turbo petrol engines ,stop start systems and 'mild' hybrids .But many of them didnt fully deliver in 'real world' use.
Incidentally, sorry to go off topic. I've mentioned in other posts that a new high speed charging station near me has power problems and they have installed extra storage batteries and a diesel generator the size of a shipping container. Yesterday it was running at full pelt, with visible heat haze and fumes, charging just two EV's. I'm not a climate change denier. I really hope real progress is made.
Although I am very happy with the mpg of my mk4 my previous diesel cars (a Yaris and a corsa) could get close on a good day. But I am so pleased with the relative silence, ease of driving and other advantages of the hybrid system and transmission, that I would still favour it even if fuel consumption were higher. Its a bonus that its not. (sorry if this is environmentally selfish
) A few years ago I was attracted by the claimed mpg of some of the new 1 litre turbo petrol engines ,stop start systems and 'mild' hybrids .But many of them didnt fully deliver in 'real world' use. Incidentally, sorry to go off topic. I've mentioned in other posts that a new high speed charging station near me has power problems and they have installed extra storage batteries and a diesel generator the size of a shipping container. Yesterday it was running at full pelt, with visible heat haze and fumes, charging just two EV's. I'm not a climate change denier. I really hope real progress is made.
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Honda Jazz Mk1 2002-2008 / Missfire? question Jazz 2005 CVT
« Last post by CPJ on January 21, 2025, 10:48:40 AM »Hi all, I have a 2005 Jazz with only 60k on, changed all 8 plugs as miss firing under load , confirmed by OBD that friend has. (note: had to gently drive it 200miles as on a long journey when misfire started) Once changed the error code cleared. Starts on the button and revs clean however still 'misfiring' (but not as bad) under hard acceleration. Done the 'old school' thing and popped some redex in but only just, so no change yet. No eng check light etc, would another OBD test pick anything up? Any advice on where to go next appreciated. Thanks in advance
