P2610

P2610-PCM INTERNAL SHUTDOWN TIMER RATIONALITY TOO FAST

For a complete wiring diagram refer to the Wiring Information Electrical Diagrams.

Theory of Operation

The PCM shutdown timer is compared with the main processor timer shortly after the engine has started. If there is a difference between the two timers, then a fault is set. This is a two trip fault to set the MIL. If the battery is disconnected for more than 60 seconds then the power supply that maintains the shutdown timer is lost, and so a pending fault will be set the next time the battery is re-connected and the PCM powered up.

- When Monitored:
On power up, the check is made for the battery disconnect, and then 5 seconds after the engine has started the timer check is evaluated.

- Set Condition:
A greater than 60 second battery disconnect or a difference between the two internal PCM timers. Two trip fault. Three good trips to turn off the MIL.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure.

1. ACTIVE DTC

NOTE: Diagnose and repair any other DTCs set in the PCM before proceeding with this test.

1. Turn the ignition on.
2. With the scan tool, Clear DTCs in the Powertrain Control Module (PCM).
3. Start the engine and allow it to reach operating temperature.

WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing. Failure to follow these instructions may result in possible serious or fatal injury.

4. With the scan tool, select View DTCs.

Is the DTC Active at this time?

Yes

- Go To 2

No

- Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Checking for an Intermittent DTC

2. PCM IGNITION CIRCUIT
1. Turn the ignition off.
2. Disconnect the C1 PCM harness connector.

CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install PCM Pinout Box 8815 to perform diagnosis.

3. With a 12-volt test light connected to ground probe the (F1) Fused Ignition Switch circuit.
4. Perform the above check with the Ignition key in the off lock position, Ignition on, engine not running position, and during cranking.
5. Wiggle the related wire harness while probing the special tool with the test light to try to interrupt the circuit.

Does the test light illuminate brightly?

Yes

- Go To 3

No

- Repair the open or excessive resistance in the (F1) Fused Ignition Switch circuit. Inspect the related fuse, if the fuse is open check the circuits for a short to ground.
- Perform the PCM Verification Test. PCM Verification Test

3. POWERTRAIN CONTROL MODULE (PCM)
1. Verify that the PCM is operating at the latest software version available.
2. Search for any Technical Service Bulletins that may apply.

Were any problems found?

Yes

- Repair as necessary.
- Perform the PCM Verification Test. PCM Verification Test

No

- Replace and program the Powertrain Control Module (PCM).
- Perform the PCM Verification Test. PCM Verification Test