## DTC Troubleshooting: P1607 (0-2)

DTC P1607 (0-2): | Malfunction in ECM/PCM Internal Circuit

1. | Reset the ECM/PCM.

2. | Turn the ignition switch ON (II).

3. | Start the engine.

4. | Wait 40 seconds. Is DTC P1607 indicated? YES - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM, then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/ PCM.n NO - Intermittent failure, system is OK at this time. A low battery can cause this problem. Ask the customer if there has been any recent trouble starting the engine.n