Andy- The below information might help you out, each individual ALDL code will repeat itself 3 times and the whole process will continue for as long as the terminals are jumped. Heaps of time for you to fire up your wheelchair and clean your glasses before getting around to the other side
Enjoy.
Extracting Codes
The codes are extracted on all ALDL connectors by jumping the white/black diagnostic test terminal to the black earth terminal on the assembly line diagnostic link (ALDL) connector. On the 6 Pin Connector this is done by jumping pin’s A and B. On the 16 Pin Connector codes are extracted by jumping pins 5 and 6. Codes will then be displayed with the ignition in the ‘ON’ position.
Please note I- damage to the EPROM (electrically erasable programmable read only memory calibration unit) or related components can easily occur if the incorrect pins are jumped. To prevent damage to the EPROM, the ignition must be switched off when jumping pins, disconnecting and connecting power. Care should also be taken when terminals are jumped, if the engine is started or cranked at any time EPROM damage can occur.
Please Note II- Code extraction and related processes will only work on a factory standard ECU. Modified ECU's will have a different set of codes, which should be diagnosed as specified by the manufacturer.
Interpreting Codes
1. The codes will be displayed as a series of flashes from the Check Engine Lamp.
2. Each code is represented by two groups of flashes separated by a 1.2 second pause.
3. The first series of flashes represents tens; the second series represents units. For example, 4 flashes, followed 1.2 seconds later by 1 flash, would indicate code 41 (CAS- Crank Angle Sensor).
4. Each code will be displayed 3 times.
5. If more than one fault is in memory, each code will be displayed three times followed by a 3.2 second pause then the next code will be displayed
6. The sequence will be repeated while the ALDL terminals are jumped.
7. No new codes will be set while the ALDL is jumped.
8. Code 12 (system pass) will be set if no faults are detected.
9. Record any codes if present
10. Confirm the codes before fault diagnosis (see Code Confirmation)
Please Note- a pen and paper really comes in handy when recording fault codes.
Code Confirmation
Before moving on any code/s should be confirmed prior to further diagnosis.
1. To confirm the codes, remove the jump wire from the ALDL
2. If the code is not set after confirmation, an intermittent fault is indicated.
Clearing Codes
Once a code has been displayed and the fault has been repaired it is recommended that you clear the codes. Codes are cleared using the below process.
1.With the ignition in the ‘OFF’ position disconnect the ENG COMP fusible link on early models, or the ENGINE fusible link on later models, for at least 10 seconds. These are located in the smaller box below your relay box in the engine bay.
2.Refit the fusible link.
