Can someone tell me where the check connector is located for the engine/gearbox ecu. The car is a '91 magna 4cy 2.6 automatic.

Right next to the interior fusebox (Or am I getting confused with another car :confused: )

thanks i will see if i can find it tomorow, What does the connector look like (how many pins)and do you know which pins to bridge to get error codes, also a list of what the codes mean would be good if anyone's got one.

Yeah it's on the drivers side next to the fuse box. If you want i can find out the error codes and what pins to bridge tomorrow cos I don't have my manual with me at the moment.

If you want i can find out the error codes and what pins to bridge tomorrow cos I don't have my manual with me at the moment.

that would be awesome!

The fault codes can be read for the Engine ECU, Transmission ECU (where fitted) and the cruise control (where fitted).

The code can be read with a LED test light or high impedence (Min 1 megohm) analogue volt meter.

The pulses are displayed as a series of long and short pulses. To identify the the code number, note the number of long and short pulses. One long pulse followed by 4 short pulses is code 14. If more than one code exists they will be displayed in numerical order with a pause in between. If no faults are present a continuous series of short pulses will be displayed.

To Test

Connect the negative lead of the test equipment to pin 12 and the postive lead to pin 1 and turn ignition on. Read codes.

Engine ECU Codes

11 Oxygen sensor circuit
12 Air flow sensor
13 Intake air temperature sensor
14 Throttle position sensor
21 Coolant temp sensor
22 Crank angle sensor
23 No 1 cylinder TDC sensor
23 Vehicle speed sensor
25 Atmospheric pressure sensor
31 knock sensor
36 Ignition timing
41 fuel injectors

If anyone wants the test points and codes for the Transmission and crusie control let me know and i will post it.

If anyone wants the test points and codes for the Transmission and crusie control let me know and i will post it.

can you get the test points and codes for the transmission.
thanks

can you get the test points and codes for the transmission.
thanks

Sure can. There are a crazy amount of codes for the transmission but here goes

The codes marked with a * apply only to the F4A33 Transmission. All other codes apply to both the F4A23 and F4A33

To Test

Connect the negative lead of the test equipment to pin 12 and the postive lead to pin 6 (from Attached pic above) and turn ignition on. Read codes

11 Excessively high TPS sensor output
12 Excessivley low TPS sensor output
13 TPS Malfunction
14* Improperly adjusted TPS
15 Open circuit in low temp side of oil temp circuit
16* Short circuit in high temp side of oil temp circuit
17* Open circuit in high temp side or short in low temp side of oil temp circuit
21 Open circuit kickdown servo switch circuit
22 Short circuit kickdown servo switch circuit
23 Open circuit pulse pick up cable circuit
24 Open circuit or improperly adjusted accelerator switch
31* Open circuit pulse generator A
32 Open circuit pulse generator B
41 Damaged or disconnected wiring of shift control solenoid valve A system
42 Short circuit shift control solenoid valve A system
43 Damaged or disconnected wiring of shift control solenoid valve B system
44 Short circuit shift control solenoid valve B system
45 Damaged or disconnected wiring of pressure control solenoid valve system
46 Short circuit pressure control solenoid valve system
47 Damaged or disconnected wiring of lock up clutch control solenoid valve system
48 Short circuit lock up clutch control solenoid valve system
49 Malfunction of lock up clutch system
51 First gear non sychronous
52 Second gear non sychronous
53 Third gear non sychronous
54 Fourth gear non sychronous

If certain faults codes are generated four times the computer enters limp mode and displays the following fault codes. In limp mode the transmission is lock in third gear when drive is selected and locked in second gear when 2 or L are selected.

Below is the limp mode codes followed by a description followed by the code that was generated four times.

81* Open circuited pulse genrator A code 31
82 open circuited pulse generato B code 32
83 Open circuit or short circuit shift control solenoid valve A code 41 or 42
84 Open circuit or short circuit shift control solenoid valve B code 43 or 44
85 Open circuit or short circuit pressure control solenoid valve code 45 or 46
86 Gear shifting does not match engine speed code 51, 52, 53, 54

cheers!

why do you have to use an analoge volt meter, is it because a digital one won't have the reponse time to pick up the pulses?

why do you have to use an analoge volt meter, is it because a digital one won't have the reponse time to pick up the pulses?
A digital volt meter with a bar graph display is ok but yes it is difficult to read pulses on a digital screen because the numbers are changing so rapidly. I find the analogie one heaps easier, the needle just swings from side to side.

Just dont use a normal globe as a test light.