| Test | TECH 1 | Notes | Nominal Values | Possible |
|---|---|---|---|---|
| Step | Display | Trouble | ||
| No. | Codes | |||
| 27 | EXHAUST CODING | Ignition ON * | ||
| Engine idling | ||||
| With closed loop systems | ||||
| C 20 NE, C 30 LE, C 20 NEF: | US 5V | 13 | ||
| With open loop systems | ||||
| 20 SE, 20 SER, 20 SEH, 20 NE | ECE 0V |
Before trouble-shooting make sure that the correct exhaust coding has been carried out for the respective system.
- See Table 3 -
Trouble-shooting: Nominal Value: Cause of Trouble:
(if nominal value not attained)
Closed loop system US 5V · Short circuit between Ter. 27 of control
Display shows unit and ground
· Wrong wiring harness installed
· Control unit defective
Open loop system ECE 0V · Cable interruption control unit
Display shows to ground
· Control unit defective
* Exhaust coding only on 4-cylinder engines