Digifant IITo access the fault system, locate the white/red wire behind the fuse box (it might be hidden under the carpet), it is a single spade connector (red) coming out of the main engine harness from the firewall. (see note for 1987-1989 California cars below). Connect an LED test light between this point and a battery positive (+). The LED should light briefly when the ignition is switched on, indicating the system is responding. The LED should go out. If not, a fault is stored. To check faults, connect a jumper wire between the same test pin connector and ground (-) for at least five seconds. Remove the jumper, and the LED should flash one long pulse, then several shorter pulses (with spaces) indicating codes. Please click here for an example.
The example picture above would indicate a 1234 code. Connect the jumper again for at least 4 seconds to advance to the next code. When "0000" (2.5s flashes at 2.5s intervals) or "4444" is read, the sequence is completed. To clear the codes, connect the jumper with the ignition off, then turn it on. After 5 seconds, remove the jumper, and "4444" should be read.
NOTE: On 1987-1989 California emissions models, there is a "CHECK" button on the dashboard. It acts as the jumper wire and the LED; follow the directions above, but depress the button as if you were connecting the jumper wire, and the CHECK light will flash codes.
|2142||Knock sensor||Defective knock sensor or wiring. Control unit not recognizing knock signal|
|2232||Air flow sensor potentiometer||Defective air flow sensor potentiometer or wiring|
|2312||Coolant temperature sensor||Defective coolant temperature sensor or wiring|
|2322||Intake air temperature sensor||Defective intake air temperature sensor or wiring|
|2342||Oxygen sensor||Defective oxygen sensor or wiring|
|4444||No faults recorded||-|
|0000||End of fault code sequence||-|