ECU codes and how to read them out.pdf

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Series 1
All diagnostic connectors are located in the right hand side of the car in the large black box.
The cover can easily be removed by first removing the front cover exposing the relais followed
by the top cover. This will expose the ECU's. From front to back the following ECU's can be
found (dependant on the equipment installed) Hydroactive I or II, Engine ECU, ABS ECU. The
diagnostic connectors can be found floating arround in the ECU compartment, and can be
identified by their color. The diagnostic connectors are protected by a cover which can be
removed.
Hydroactive diagnostic connector : blue.
Engine diagnostic connector : green (pin 2)
ABS diagnostic connector : grey
Airco diagnostic connector : black
Series 2
I'm unsure from what, till what time the large 30 pins diagnostic connector is used. The
connector is 3 pins wide and 10 pins long with the connector housing being brown. The pins
are numbered 1,2,3 from top to bottom and A,B,C….,I,J from left to right.
Hydroactive diagnostics pin : E2
Engine diagnostics pin : C3
ABS diagnostics pin : E1
Airco diagnostics pin : F1
The following circuit can be used to read out the diagnostic codes.
680 Ohm
To diag-
nostics pin
+12 V
LED
switch
GND
( - of battery)
In case the large 30 pins diagnostic connector is present only a wire to connect the diagnostic
pin to ground is needed. The readout will work via the diagnostic lights on the dashboard. (In
case it doesn't work, one can always revert back to the circuit described above.)
To start readout of the codes:
1. Connect the circuit above, with the switch opened.
2. Turn on ignition
3. Within 3 seconds close the switch for 3-5 seconds, and open it again
4. The start code 12 will apear. Blink, pause, blink,blink.
5. Press the switch again for 3-5 seconds, and open it again.
6a. Now the diagnostic codes will follow in case there is an error code stored.
6b. If no more codes are stored the end code 11 will apear. Blink, pause, blink.
7a repeat step 5 and 6 until all codes are read out
7b After the end code you can clear all codes.
To clear all stored error codes:
1. First read out all codes described above
2. After the end code, close the switch for excactly 15 seconds.
3. Open the switch again
4. Now all stored codes are cleared.
Alternatively you can erase all error codes by disconnecting the battery for 10 (or more)
minutes. This will not only clear the codes, but also erase the 'learned' settings (eg for the
engine) and refer back to factory default.
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To test engine components:
Don't use this if you don't know what you are doing!!
1. Be sure ignition is turned off.
2. Close the switch
3. Turn on ignition
4. Within 1-12 seconds open the switch again
5. Wait some seconds
6. First code 91 will appear. Meaning the fuel pump will be activated periodically.
7. Close the switch for 3-5 seconds to test the next component.
8. Repeat until you arrived at the component which you want to test.
To tune the engine ecu:
Don't use this if you don't know what you are doing!! (I never tried it, so I don't guarantee it will
work. It should work however on a Fenix 3B ecu (3.0 V6-12)
1. Be sure ignition is turned off.
2. Close the switch
3. Turn on ignition
4. Within 1-12 seconds open the switch again
5. Within 3 seconds close the switch again for 3-5 seconds.
6. Open the switch for 3 seconds (5 max)
7. Close the switch again for 3-5 seconds.
8. Open the switch again.
9. The ECU should indicate code 22 by blinking. Meaning program start.
10. Enter code 2 by means of close 5 secs, open 3 secs, close 5 secs, open again.
11. The ECU will return 12 by blinking. Meaning 4 degrees ignition advance.
12. Close switch for 10-20 seconds. ECU will indicate code 11, meaning 2 degrees earlier.
Regretfully I don't have more data on this.
Code Description
Check
Comp
****
ECU XM Magneti Marelli G5
XM 2.0 RDZ XU10M Monopoint
XM 2.0 R6A XU10J2 Monopoint (from '91)
***
11 End test
***
12 Start test
***
13 Injection air temp sensor
4k@10C; 2,5k@20C; 680@55C
907
14 Cooling water temp sensor
4k@10C; 2,5k@20C; 680@55C; 230@90C
909
21 Throttle spindle potentiometer
4,5V max swing on pin 2
770
22
Idling actuator / Idle speed
regulator
432
23 Idle speed control failure
31
Automatic adjustment air/fuel
ratio
oxygen/lambda sensor too quick (disconnect heater
element to resolve)
170 hPA : 0.25V, 1040 hPA : 4.8V between pin 9
and 12 (gnd) on ECU
900
33 Inlet manifold air pressure sensor
903
34
Canister discharge valve (active
carbon filter)
430
41 Engine speed sensor
345 Ohm between pin 14 and 31; check isolation to
ground
152
42 Fuel injector
Check resistance of injector. 1.5 Ohm
570
45 Ignition coil 1-4
Check voltage between pin 1 and ground, should be
+12V. Check primary windings should be 1.4 Ohm
(between pin 1 and 4 on coil), secondary 8.6kOhm
(Valeo) or 14kOhm (Bosch)
inlet or outlet manifold leak or lambda-sensor
failure
52 Air/fuel mixture control loop
54 ECU malfunction
142
57 Ignition coil 2-3
Check voltage between pin 2 and ground, should be
+12V. Check primary windings should be 1.4 Ohm
(between pin 2 and 4 on coil), secondary 8.6kOhm
(Valeo) or 14kOhm (Bosch)
Code Description
Check
Comp
****
ECU XM Bosch Motronic MP3.1
XM 2.0 RFZ XU10J2/Z Multipoint (till jun-93)
***
11 End test
***
12 Start test
***
13 Injection air temp sensor
4k@10C; 2,5k@20C; 680@55C
907
14 Cooling water temp sensor
4k@10C; 2,5k@20C; 680@55C; 230@90C
909
21 Throttle spindle potentiometer
Closed 0.5V, fully open 4.5V (minimal)
770
22
Idling actuator / Idle speed
regulator
Automatic adjustment air/fuel
ratio
432
31
Check ogygen sensor, inlet&outlet manifold on
leakage, fuel pressure, fuel injectors, spark plugs,
air filter element, compression.
Is integrated in the ECU and cannot be checked.
Check vacuum hose to ECU.
900
33 Inlet manifold air pressure sensor
34
Canister discharge valve (active
carbon filter)
430
41 Engine speed sensor
245 Ohm between pin 23 and 25; check isolation to
ground
When engine hot and running should constantly
change from 0 to 1V measured between pin 24 and
pin 8.
inlet or outlet manifold leak or lambda-sensor
failure
Pin 16 and 5 should be connected to ground. Pin 18
should have +12V.
152
51 Oxygen/lambda sensor
900
52 Air/fuel mixture control loop
53 Sensor power supply
54 ECU malfunction
142
Code Description
Check
Comp
****
ECU XM Bosch Motronic MP3.2
XM 2.0 Turbo RGY or RGX XU10J2T/Z/L/L3
Multipoint
***
Warning: Not checked against
actual schematics!
11 End test
***
12 Start test
***
13 Injection air temp sensor
4k@10C; 2,5k@20C; 680@55C
907
14 Cooling water temp sensor
4k@10C; 2,5k@20C; 680@55C; 230@90C
909
21 Throttle spindle potentiometer
Closed 0.5V, fully open 4.5V (minimal)
770
22
Idling actuator / Idle speed
regulator
Automatic adjustment air/fuel
ratio
432
31
Check ogygen sensor, inlet&outlet manifold on
leakage, fuel pressure, fuel injectors, spark plugs,
air filter element, compression.
Is integrated in the ECU and cannot be checked.
Check vacuum hose to ECU.
900
33 Inlet manifold air pressure sensor
34
Canister discharge valve (active
carbon filter)
430
41 Engine speed sensor
330 Ohm between pin 48 and 49; check isolation to
ground
152
43 Engine knock control loop
correct fuel grade, mechanical state engine
44 Anti-knock sensor
Check mounting of sensor (torque: 20Nm)
150
51 Oxygen/lambda sensor
When engine hot and running should constantly
change from 0 to 1V measured between pin 28 and
pin 10.
inlet or outlet manifold leak or lambda-sensor
failure
900
52 Air/fuel mixture control loop
53 Sensor power supply
54 ECU malfunction
142
65 Sensor reference cylinder
71 Fuel injector 1
Check fuel injector resistance. Should be 16 Ohm
each.
Check fuel injector resistance. Should be 16 Ohm
each.
Check fuel injector resistance. Should be 16 Ohm
each.
Check fuel injector resistance. Should be 16 Ohm
each.
72 Fuel injector 2
73 Fuel injector 3
74 Fuel injector 4

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