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Isuzu Trooper Owners Club UK™
Isuzu Trooper, Rodeo, Bighorn, Mu & VehiCROSS Owners Club
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lordcoleman
Newbie
Joined: 04 Mar 2023
Posts: 4
Location: Ja
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 Posted: Sat Mar 04, 2023 20:25 Post subject: |
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| lordcoleman wrote: |
| lordcoleman wrote: |
| Gribble wrote: |
Your getting it a bit mixed up there  The red light to the right of the steering wheel is the anti theft system and the red Check engine light in the middle of the dash is for the immobiliser . 2 seperate systems . The one by the wheel flashing when you crank over is ok to do that .
Check the brown relay by the blue relay is clicking when the key goes to ign on . Check the two earths in J3 have continuity
The anti theft ECU lives up behind the red light to the right of the wheel and the immobilizer ECU lives under the passenger dash.
If you try to bypass the immobilizer ECU it will see it as a theft attempt and shut down and it controls the injectors and the ropcv via the ECU and will need T2 to set it up again  |
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Hi, great advice, this is an old thread I know. My 4jx1 has problem with voltages at ECM J3 connection. Both the connections (coming from ignition relay 1 and 2) are at 12V even when relay #1 is removed from circuit!. I disconnected the power jack from the ECM and there is a short between the pole 1 and 2 on the ECM directly. If I test the power jack itself, power only arrives from relay# 1 and there is power only to connection #1. The ECM doesnt produce 5V, no start, seem ECM is not active. Any help? could this be the immobilizer? I have a remote key, no difference. I had fiddled with the ECM before while battery was connected I think i messed something up |
Just an update, ive discovered that the ECM got hit. Im going ot post a picture fopr all to see what inside of a 4JX1 Electronic control module ECM schematic circuit looks like |
No images from my computer possible. That's quite odd! |
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| Posted: Sat Mar 04, 2023 20:25 Post subject: Google Ads keep this community free to join! |
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lordcoleman
Newbie
Joined: 04 Mar 2023
Posts: 4
Location: Ja
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| Posted: Sat Mar 04, 2023 20:30 Post subject: |
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| lordcoleman wrote: |
| lordcoleman wrote: |
| lordcoleman wrote: |
| Gribble wrote: |
Your getting it a bit mixed up there The red light to the right of the steering wheel is the anti theft system and the red Check engine light in the middle of the dash is for the immobiliser . 2 seperate systems . The one by the wheel flashing when you crank over is ok to do that .
Check the brown relay by the blue relay is clicking when the key goes to ign on . Check the two earths in J3 have continuity
The anti theft ECU lives up behind the red light to the right of the wheel and the immobilizer ECU lives under the passenger dash.
If you try to bypass the immobilizer ECU it will see it as a theft attempt and shut down and it controls the injectors and the ropcv via the ECU and will need T2 to set it up again |
*************
Hi, great advice, this is an old thread I know. My 4jx1 has problem with voltages at ECM J3 connection. Both the connections (coming from ignition relay 1 and 2) are at 12V even when relay #1 is removed from circuit!. I disconnected the power jack from the ECM and there is a short between the pole 1 and 2 on the ECM directly. If I test the power jack itself, power only arrives from relay# 1 and there is power only to connection #1. The ECM doesnt produce 5V, no start, seem ECM is not active. Any help? could this be the immobilizer? I have a remote key, no difference. I had fiddled with the ECM before while battery was connected I think i messed something up |
Just an update, ive discovered that the ECM got hit. Im going ot post a picture fopr all to see what inside of a 4JX1 Electronic control module ECM schematic circuit looks like |
No images from my computer possible. That's quite odd! |
ok just post me here and ill send you the images. Im going to attempt a repair |
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