| No. | TECH 1 | Checking Conditions | Nominal Values | Trouble | Terminal |
|---|---|---|---|---|---|
| Display | Codes | ||||
| 21 | INJECTION PULSE | Ignition ON | - | D 15/A 6 | |
| Engine OFF, engine cold | |||||
| Throttle valve completely "CLOSED" | > 3 ms | ||||
| Throttle valve completely "OPEN" (100%) | < 3 ms | ||||
| Engine at idle speed, operating temperature | 0.8 to 1.5 ms |
The injection period is an internal value of the control unit.
If the injection period deviates considerably from the above values, check the following points:
All consumers switched off ?
Circuit closed ? (test step 07)
Integrator OK ? (test step 09)
02 BLM IDLE THR. OK ? (test step 10)
02 BLM PART THR. OK ? (test step 11)
Transmission in idle speed P/N position ?
Throttle valve potentiometer OK ? (test step 04)
Intake manifold pressure sensor OK ? (test step 03)
Idle speed stepper motor OK ? (test step 06)
Basic adjustment of ignition OK ? (test step 17)
If all above-mentioned check points are OK: Disconnect control unit from vehicle electrical system (reset), repeat test.
Trouble-shooting: Nominal Value: Cause of Fault:
(If nominal value is not attained)
· Ignition ON 1.0 to 1.2 ms
Engine at idle speed at 1500 rpm Switch off consumers!
(mode "F7", submode "F0") and
is at operating temperature. The injection time must slightly · Control unit defective
- Adjust to 1000 rpm using the increase as the engine speed
arrow keys on TECH 1. decreases.