| Test | TECH 1 | Notes | Nominal Values | Possible |
|---|---|---|---|---|
| Step | Display | Trouble | ||
| No. | Codes | |||
| 21 | INJECTION PULSE | Ignition ON | ||
| Engine at idle speed at 1500 rpm (adjusted | ||||
| via TECH 1 mode "F7", sub-mode "F0") and is at | ||||
| operating temperature, | 0.6 to 1.3 ms | - | ||
| adjust with the arrow key on TECH 1 to 1000 rpm | 0.7 to 1.5 ms |
Trouble-shooting: Nominal Value: Cause of Fault:
(If nominal values are not attained)
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:
1. All consumers switched off ?
2. Circuit closed ? (test step 07)
3. Integrator OK ? (test step 09)
4. 02 idle speed MSTS OK ? (test step 10)
5. 02 partial load MSTS OK ? (test step 11)
6. Transmission in position P/N ?
7. Throttle valve potentiometer OK ? (test step 04)
8. Intake manifold pressure sensor OK ? (test step 03)
9. Idle air control stepper motor OK ? (test step 06)
If all the above-mentioned check points are OK: Disconnect control unit from vehicle electrical supply (reset), repeat test
· Ignition ON
Engine at idle speed at 1500 rpm
(adjusted via TECH 1 mode "F7", sub-mode · If the customer complains,
"F0") and is at operating temperature, 0.6 to 1.3 ms replace the control unit.
adjust with the arrow key on TECH 1
to 1000 rpm 0.7 to 1.5 ms