Test Procedure

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AN1 VERIFY CORRECT PTO OPERATION

Key in OFF position.
Disconnect the PTO system or auxiliary idle control.
Key ON, engine OFF.
Carry out the PCM self-tests.
Is DTC P1502 present?

Yes	No
GO to AN2.	REFER to the Owner's Literature provided with the PTO system or auxiliary idle control to verify correct operating procedures, entry conditions, and diagnostic information.

AN2 CHECK THE PTO INPUT FOR A SHORT TO VOLTAGE

Key in OFF position.
PCM connector disconnected.
Key ON, engine OFF.

Measure the voltage between:

( + ) PCM Connector, Harness Side	( - )
PTO	Ground

Is any voltage indicated?

Yes	No
REPAIR the short circuit to PWR. CLEAR the DTCs. REPEAT the self-test.	CLEAR the DTCs. REPEAT the self-test. If DTC P1502 is present again, GO to AN3.

AN3 CHECK FOR CORRECT PCM OPERATION

Disconnect all the PCM connectors.
Visually inspect for:
- pushed out pins
- corrosion
Connect all the PCM connectors and make sure they seat correctly.
Carry out the PCM self-test and verify the concern is still present.
Is the concern still present?

Yes	No
INSTALL a new PCM. REFER toFLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) .	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.