DTC P1409: EGR Vacuum Regulator: Condition

DTC indicates self-test has detected electrical malfunction in EGRVR circuit. Possible causes are:

EGRVR circuit open or shorted.
Faulty EGR VR solenoid.
Faulty PCM.

Turn ignition off. Disconnect EGR VR solenoid connector. Measure resistance between EGR VR solenoid terminals. If resistance is 26-40 ohms, go to next step. If resistance is not 26-40 ohms, replace EGR VR solenoid.

Check VPWR To EGR VR Solenoid

Turn ignition on. Measure voltage between VPWR terminal at EGR VR solenoid wiring harness connector and chassis ground. If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, repair open in VPWR circuit.

Check EGRVR Circuit Continuity

Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Connect Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 47 and EGRVR terminal at EGR VR solenoid wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in EGRVR circuit.

Check EGRVR For Short To PWR

Turn ignition on. Measure voltage between test pin No. 47 at breakout box and chassis ground. If voltage is less than one volt, go to next step. If voltage is one volt or more, repair short to power in EGRVR circuit.

Continuous Memory DTC P1409

This DTC indicates self-test has detected electrical malfunction in EGRVR circuit. Possible causes are:
- EGRVR circuit open or shorted.
- Faulty EGR VR solenoid.
- Faulty PCM.
Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Connect Breakout Box (014-00950), leaving PCM disconnected. Turn ignition on. Measure voltage between test pins No. 47 and 24 (PWR GND) at breakout box. Voltage should be more than 10.5 volts. Observe DVOM for indication of fault while wiggling EGR VR wiring harness and connector. Fault is indicated by a sudden drop in voltage reading. Tap lightly on EGR VR solenoid to simulate road shock. If fault is indicated, isolate and repair as necessary. If no faults are indicated, unable to duplicate or identify fault at this time. Go to DIAGNOSTIC TEST Z (INTERMITTENT) .