| Test | TECH 1 | Notes | Nominal Values | Pin | Possible |
|---|---|---|---|---|---|
| Step | Display | Trouble | |||
| No. | Codes | ||||
| 13 | INJECTION PULSE | Engine at idle speed, | 16, 17 | MY '89: | |
| operating temperature | 14 | 44, 45 | |||
| MT vehicles | 2.0 to 2.8 ms | MY '90 | |||
| AT vehicles | 2.0 to 3.0 ms | 38, 39 |
This test step serves as a learning and checking value to understand the system better and to evaluate the system on external influences.
The injection period is composed of several elements which have an influence on the size of the signal. If the measurement values of the following test steps deviate from the nominal values (see quick check), trouble-shooting is to be carried out.
Test Step Test of Further additional causes of trouble are:
No.:
· Lead interruptions from
01 BATTERY VOLTAGE - Fuel pump relay Ter. 87 (+) to the injection valves
05 INT. MANIFOLD V. - Control unit Ter. 37 to the injection valves
06 COOLANT TEMP.
07 AIR FLOW SENSOR · Pressure regulator defective
09 TPS SIGNAL · Jammed injection valves
10 ENGINE LOAD SIG. · Electromagnetic disturbances caused by
14 ENGINE SPEED - Ignition leads (increase distance to wiring harness)
29 O2 SENSOR - Alternator (worn carbon brushes produce sparks)
30 O2 INTEGRATOR
31 O2 BLM IDLE THR. · Control unit defective