P1500
DIAGNOSTIC TROUBLE CODE P1500
Battery voltage too high or too low
Fault Symptom.
DRIVEABILITY may be affected.
Condition
+15 continuously higher than 16 V or lower than 10 V for longer than 60 seconds after starting.
Diagnostic Procedure.
1. Connect the Scan Tool.
Start the engine and run it at idling speed.
Select "READ FUNCTIONS".
Select "BATTERY VOLTAGE".
The Scan Tool should show 12.5 - 14.0 V.
If the voltage is outside the 12.5 - 14.0 V limits, continue fault diagnosis in the electrical system.
2. Measure battery voltage directly across the two battery terminals.
The voltage should be 12.5 - 14.0 V.
Compare the reading with the Scan Tool display.
The difference should be < 0.5 V.
If the difference is <0.5 V, proceed to step 4.
If the difference is > 0.5 V, undo grounding steps G7P and G7S, clean the contact surfaces and refit them.
NOTE: The Motronic system will continue to work even if one of the grounding steps, G7P or G7S, is disconnected. The grounding steps are connected internally in the control module.
Then repeat step 2.
If the difference is still greater than 0.5 V, continue with step 3.
3. Connect a BOB.
Start the engine.
Check the battery voltage and connection to ground by taking voltage readings across:
- Battery positive and pin 18 _______ <0.5 V
- Battery positive and pin 27 _______ <0.5 V
- Battery positive and pin 37 _______ <0.5 V
- Pin 2 and battery negative ________ <0.1 V
- Pin 14 and battery negative _______ <0.1 V
- Pin 19 and battery negative _______ <0.1 V
- Pin 24 and battery negative _______ <0.1 V
If any voltage reading is not OK, check the wiring and possibly remedy the fault.
If the voltage readings are OK, continue with step 4.
4. Clear the diagnostic trouble code and drive the car to see whether the DTC is generated again.
If the diagnostic trouble code is generated again, continue at "Procedure Before ECM Replacement". Component Tests
If the trouble code is not generated again the remedial measure taken was correct, otherwise the fault is of intermittent type