P1607

DTC P1607: ECM Internal Circuit Malfunction

NOTE:
- Information marked with an asterisk (*) applies to '04 model.
- If the No. 25 BACK UP (7.5 A) fuse is removed and the ignition switch is ON (II), MIL will report on and ECM will store the DTC P1607 (P0607)*.

1. Reset the ECM.
2. Turn the ignition switch OFF.
3. Turn the ignition switch ON (II).

Is DTC P1607 (P0607) (*) indicated?

YES - Substitute a known-good ECM and recheck. If the symptom/indication goes away, replace the original ECM.

NO - Go to step 4.

4. Cycle the ignition switch OFF and ON (II) five times.
5. Check for a DTC or a Temporary DTC with a scan tool or the HDS.

Is DTC P1G07 (P0607) (*) indicated?

YES - Inspect the No. 25 BACK UP (7.5 A) fuse. If the fuse is OK, repair open in VBU wire between the under-dash fuse/relay box and the ECM.

NO - Intermittent failure, system is OK at this time. A low battery can cause this problem. Ask the customer if the engine had to be jump-started recently.