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Possible ECU?

Tiny
BONGO MINDANAO
  • MEMBER
  • 1996 MAZDA FRIENDEE
  • 2.5L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 120,000 MILES
Hi, when I start my Mazda Bongo Friendee cold in the morning this is what happens:

1. All 3 fans running. Fan2, Fan3 and Scavenger Fan.
2. Glow plug Relay doesn't operate.
3. Aircon compressor doesn't start.
4. Automatic gearbox in limp mode doesn't change to fourth gear.

What I have done is:
1. Service engine, oil and filters.
2. Oil change Automatic Transmission.
3. New Engine Coolant Temperature Censor. ECT.
4. Engine Temp censor to Dashboard is 100%.
5. Aircon gas is 100%.
6 If you pull Fan fuses next to Mains and Add Fan fuse, they stop operating.
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Saturday, July 23rd, 2022 AT 4:16 AM

8 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,968 POSTS
We need to do a CAN scan for codes to see what's going on, also has the car had any water damage? You can get a CAN scanner from Amazon for about $30.00. here is a video to show you how.

https://youtu.be/u-4syLc-ifQ

Here is a scanner link:

https://amzn.to/3o41KcZ

Let's remove the electrical connector from the ECU and check for moisture. Also, you can try a hard system reboot by holding the negative battery cable to the positive battery terminal for 1 minute, this will discharge the system memory capacitors and let the system reboot. Please let us know what happens.
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Saturday, July 23rd, 2022 AT 11:08 AM
Tiny
BONGO MINDANAO
  • MEMBER
  • 4 POSTS
My Mazda Bongo Friendee runs smooth again after an ECU/TCM replacement.
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Saturday, September 10th, 2022 AT 1:03 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,968 POSTS
Glad you could get it fixed, that kind of problem can be tough. Please use 2CarPros anytime we are here to help.
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Saturday, September 10th, 2022 AT 2:38 PM
Tiny
BONGO MINDANAO
  • MEMBER
  • 4 POSTS
Last question, at what water temperature should the 2 radiator fans start running? I found my normal driving temperature was around 75 degrees. Both my fans run with A/C on so that's fine.
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Saturday, September 10th, 2022 AT 8:52 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,968 POSTS
The fans should come on at 210 F. 98 C.
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Monday, September 12th, 2022 AT 3:50 PM
Tiny
BONGO MINDANAO
  • MEMBER
  • 4 POSTS
Thank you.
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Monday, September 12th, 2022 AT 7:18 PM
Tiny
SLIPMATT
  • MEMBER
  • 2 POSTS
Hi, if you don't mind me asking was the problem intermittent or permanent? We have a van with the same symptoms, however occasionally it will start normally but overheat - could it be the TCM, or something connected to it?
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Sunday, February 12th, 2023 AT 8:15 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,968 POSTS
BONGO MINDANAO our new member SLIPMATT has a follow up question for you?
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Monday, February 13th, 2023 AT 1:50 PM

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