P1570

P1570
Immobilizer - Active
Immobilizer - implausible operating range

P1571
Immobilizer - Open
Immobilizer - Interruption / no signal

Function:
During a restart of the engine or the Motronic reset, the ECM communicates with the alarm system control module. The engine can be started when this communication takes place properly. If the communication is interfered with, the engine cannot be started. The starter is not triggered.

Diagnostic Conditions:
Condition start
Motronic reset

Wiring Diagram:




Diagnostic Procedure:



1. check signal wire for continuity.
1. Remove connector 1 on alarm control module.
2. Connect special tool 9616 to wiring harness.
3. Connect ohmmeter to special tool 9616, pin 88, and to alarm system connector 1/23.

Display: 0 - 5 Ohms.

If infinite Ohms is displayed, remove connector X 3/1.

4. Connect ohmmeter to connector X 3/1, pin 14, on cavity side and special tool 9616, pin 88.

Display: 0- 5 Ohms.

If infinite Ohms is displayed, repair wiring harness.

5. Connect ohmmeter to connector X 3/1, pin 14 on pin side, and alarm control module connector I, pin 23.

Display: 0 - 5 Ohms.

If infinite Ohms is displayed, repair wiring harness.

2. Check signal wire for short circuit to ground.
1. Remove connector 1 on alarm control module.
2. Connect special tool 9616 to wiring harness.
3. Connect ohmmeter to special tool 9616, pin 88, and ground.

Display: Infinite Ohms.

If 0 - 5 Ohms is displayed, check wiring harness for chafing and pinching damage.

3. Check signal wire for short circuit to B+.
1. Remove connector 1 on alarm control module.
2. Connect special tool 9616 to wiring harness.
3. Connect voltmeter to special tool 9616, pin 88, and ground.

Display: 0 Volt.

If battery positive voltage is displayed, check wiring harness for chafing and pinching damage.