problems starting

[cherokee]

i have replaced the BCM & ECU twice first time was from a VX that was not running, my VX ran for about 2 weeks the died again, I have just got hold of another BCM & ECU from a running VX, have replaced both units now the problem is the dash lights up but the motor will not turnover I cannot lock the doors or operate the windows I have also replaced the key head

 

[accentstencil]

Are all the items linked, that is, did they all come from the same working vehicle? The key head, BCM and ECU all need to be linked or no start.

 

[cherokee]

Are all the items linked, that is, did they all come from the same working vehicle? The key head, BCM and ECU all need to be linked or no start.

yes they all came from the same car

 

[cherokee]

yes they all came from the same car

I have got hold of a multiscan p2 but I cannot get any power from the plug, I have been told that I am not getting any power from the ecu if this is correct what could be the cause

 

[cherokee]

I have got hold of a multiscan p2 but I cannot get any power from the plug, I have been told that I am not getting any power from the ecu if this is correct what could be the cause

 

[krusing]

First double check ALL of the plugs, then check the ECU & BCM Fuses.

 

[cherokee]

First double check ALL of the plugs, then check the ECU & BCM Fuses.

all fuses and plugs are ok

 

[lout]

when you try to start
do you have anything unusual where the odometer is
x in a 3 window or serv error
have you tried engineering mode on the dash
Trip computer diagnostic codes
Hold mode and up arrow then turn key to on or start
Release buttons
then
Press Mode = Dash Part Number - e.g. 1731
Press Mode = Mode Switch Voltage - e.g. BV - - - 5.0
Press Mode = Battery Voltage - e.g. V 11.8
Press Mode = Petrol Sender Voltage - e.g. FUEL 02.6
Press Mode = LPG Sender Voltage - e.g. VL 5.0
Press Mode = Remaining Fuel - e.g. 38L
Press Mode = Instantaneous Fuel (Liters per Hour) - e.g. 12.8 L/H
Press Mode = Engine Coolant Temp - e.g. 63 C
Press Mode = Vehicle Speed - e.g. 45 KM/H
Press Mode = Tachometer - e.g. 2380
Press Mode = Park Lamps Switch - e.g. P OFF
Press Mode = Dash Trouble Codes - e.g. t 00 (Press up/down to scroll through any codes, these are not PCM, ABS, etc codes)
Press Mode = Dash Test - All gauges will move, lights will come on and buzzer will sound.
Turn key off will revert to normal dash

Dash trouble codes
Format is t then code number then history then current some have nu which I cant remember but believe was not used
Eg
t00-- is fuel gauge sender open circuit no history and no current faults
t16h- is abs history codes but no current fault

00 Fuel gauge sender unit — open circuit
01 Fuel gauge sender unit — short circuit
02 Fuel gauge sender unit — intermittent
03 Fuel gauge sender unit — open circuit
04 LPG gauge sender unit — open circuit
05 LPG gauge sender unit — short circuit
06 LPG gauge sender unit — intermittent
08 No serial data from ABS
09 No serial data from BCM
10 No serial data from ECC
11 No serial data from PCM
12 No serial data from SDM
13 No instrument poll from BCM
14 No serial communication
15 No Sub-clock
16 ABS or ABS/ETC fault logged
17 BCM fault logged
18 ECC fault logged
19 PCM fault logged
20 SDM fault logged
21 Trip switch short circuit
22 Trip switch button stuck
24 EE checksum error
25 ROM checksum error
26 Internal fault