Circuit Description
When the Ignition is placed in the start position, 12 volts is supplied to the ECM notifying it that crank has been requested. If the ECM detects voltage on the circuit with the engine running, the DTC will set.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0512 Start Switch Circuit
Conditions for Running
| • | Battery voltage is between 10-16 volts. |
| • | Key switch is "ON". |
| • | Engine speed is more than 1000 RPM. |
Conditions for Setting the DTC
Starter switch continues "ON".
Action Taken When the DTC Sets
The ECM will illuminate the malfunction indicator lamp (MIL) the first time the fault is detected.
Conditions for Clearing the MIL/DTC
DTC P0512 can be cleared by using the Clear Info option on the Tech 2 or by using the Diag Clear Switch.
Diagnostic Aids
Inspect for the following conditions:
| • | Poor connections at the ECM--Inspect the harness connectors for backed-out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal-to-wire connections. |
| • | The relay remains applied on idling during cold start. |
Step | Action | Values | Yes | No |
|---|---|---|---|---|
Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Electrical Connector End Views | ||||
1 | Is DTC P0512 set when the ignition is ON or when the engine is operating? | -- | Go to Step 2 | Go to Diagnostic Aids |
2 |
Does the voltage measure equal to the specified value? | 12 V | Go to Step 3 | Go to Step 4 |
3 |
Did you complete the action? | -- | Go to Step 4 | -- |
4 |
Does DTC P0512 reset? | -- | Go to Step 2 | System OK |
