Diagnostic Instructions
DTC Descriptor
DTC P260A 00: Power Take-Off (PTO) Relay Control Circuit
DTC P260B 00: Power Take-Off (PTO) Relay Control Circuit Low Voltage
DTC P260C 00: Power Take-Off (PTO) Relay Control Circuit High Voltage
Diagnostic Fault Information
Circuit
| Short to Ground
| Open or High Resistance
| Short to Voltage
| Signal Performance
|
PTO Relay Coil Control
| P260A 00, P260B 00
| P260B 00
| P260C 00
| P260B 00
|
Circuit/System Description
The power take-off (PTO) is an upfitter integrated system that allows the user to create an auxiliary power source. The PTO system specifically controls engine speed to values higher than normal base idle, PTO load relay engagement, and remote starting
and shutdown of the engine. When the operator requests PTO using either the PTO switch or PTO remote, the engine RPM will increase to a default standby speed. The engine control module (ECM) converts the data from the engine speed sensor to a 2 pulses/engine
revolution signal. When PTO is engaged, the power take-off module (PTOM) sends a serial data message to the ECM requesting engine speeds, in accordance with the depressed switches from the PTO switch or remote.
Conditions for Running the DTC
The engine is running.
Conditions for Setting the DTC
The PTOM detects a fault on the PTO relay coil control circuit that is above or below a predetermined voltage threshold.
Action Taken When the DTC Sets
• | The malfunction indicator lamp (MIL) will not illuminate. |
• | The PTOM records the operating conditions at the time the diagnostic fails. The PTOM stores this information in the Failure Records. |
Conditions for Clearing the DTC
• | A last test failed, or the current DTC, clears when the diagnostic runs and does not fail. |
• | A history DTC clears after 40 consecutive warm-up cycles, if failures are not reported by this or any other emission related diagnostic. |
Diagnostic Aids
Using the Failure Records data may help locate an intermittent condition. If you cannot duplicate the DTC, the information in the Failure Records can help determine how many miles since the DTC set. The Fail Counter and Pass Counter can help determine
how many ignition cycles that the diagnostic test reported a pass and/or a fail.
Reference Information
Schematic Reference
Power Take-Off (PTO) Schematics
Connector End View Reference
Power Take-Off (PTO) Connector End Views
Description and Operation
Power Take-Off (PTO) Description and Operation
Electrical Information Reference
Scan Tool Reference
Circuit/System Verification
- Ignition ON, verify that DTC P0562, P0563 in the ECM and/or B1325 are not set as current.
- Verify that DTC C0899 or C0900 are not current in the scan tool.
Circuit/System Testing
- Ignition OFF, disconnect the PTO relay.
- Ignition ON, test for 11 volts or greater between the PTO relay supply voltage circuit terminal 86 and ground.
⇒ | If less than the specified voltage, test the PTO relay supply voltage circuit for a short to ground or an open/high resistance. |
- Ignition OFF, disconnect the harness connector at the PTO module.
- Ignition ON, test for 0 volts between the PTO relay coil control circuit terminal 28 and ground.
⇒ | If greater than the specified value, test the PTO relay control circuit for a short to voltage. |
- Ignition OFF, connect the PTO relay.
- Ignition ON, test for 11 volts or greater between the PTO relay coil control circuit terminal 28 and ground.
⇒ | If less than the specified voltage, test the PTO relay coil control circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the PTO relay. |
- If all circuits test normal, replace the PTO module.
Component Testing
PTO Relay
- Ignition OFF, disconnect the PTO relay.
- Test for 60-180 ohms between terminals 85 and 86.
⇒ | If the resistance is not within the specified range, replace the relay. |
- Test for infinite resistance between the following terminals:
⇒ | If less than infinite resistance, replace the PTO relay. |
- Install a 20A fused jumper wire between relay terminal 85 and 12 volts. Install a jumper wire between relay terminal 86 and ground. Test for less than 2.0 ohms between terminals 30 and 87.
⇒ | If greater than 2.0 ohms, replace the PTO relay. |
Repair Instructions
Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
Control Module References
for FPCM replacement, setup, and programming