P0405

B : Diagnostic Trouble Code (DTC) P0405 Indicates Exhaust Gas Recirculation (EGR) Valve Malfunction, Short to Battery/12 Volts

B1 : CHECK FOR A SHORT TO BATTERY VOLTAGE
1. Disconnect the EGR valve electrical connector PI 15.
2. TURN ignition switch to the ON position.
3. Measure the voltage at PI 15 pin 4 (YU).

Is the voltage more than 1 volt?

Yes
Goto B2

No
Goto B3

B2 : CHECK FOR A SHORT TO BATTERY VOLTAGE IN POWERTRAIN CONTROL MODULE (PCM)
1. Disconnect PCM electrical connector PI 1.
2. Measure the voltage at PI 15 pin 4 (YU).

Is the voltage more than 1 volt?

Yes
REPAIR circuit between the PI 1 pin 57 (YU) and the EGR valve electrical connector PI 15 pin 4 (YU). CLEAR DTC. To validate fix drive vehicle between 30 mph (48 kph) and 40 mph (64 kph). Allow vehicle to idle for 2 minutes.

No
INSTALL a new PCM. CLEAR DTC. To validate fix drive vehicle between 30 mph (48 kph) and 40 mph (64 kph). Allow vehicle to idle for 2 minutes.

B3 : CHECK FOR A SHORT TO BATTERY VOLTAGE
1. Measure the voltage at PI 15 pin 1 (YG).

Is the voltage more than 1 volt?

Yes
Goto B4

No
Goto B5

B4 : CHECK FOR A SHORT TO BATTERY VOLTAGE IN POWERTRAIN CONTROL MODULE (PCM)
1. Disconnect PCM electrical connector PI 1.
2. Measure the voltage at PI 15 pin 1 (YG).

Is the voltage more than 1 volt?

Yes
REPAIR circuit between the PI 1 pin 58 (YG) and the EGR valve electrical connector PI 15 pin 1 (YG). CLEAR DTC. To validate fix drive vehicle between 30 mph (48 kph) and 40 mph (64 kph). Allow vehicle to idle for 2 minutes.

No
INSTALL a new PCM. CLEAR DTC. To validate fix drive vehicle between 30 mph (48 kph) and 40 mph (64 kph). Allow vehicle to idle for 2 minutes.

B5 : CHECK FOR A SHORT TO BATTERY VOLTAGE
1. Measure the voltage at PI 15 pin 6 (YR).

Is the voltage more than 1 Volt?

Yes
Goto B6

No
Goto B7

B6 : CHECK FOR A SHORT TO BATTERY VOLTAGE IN POWERTRAIN CONTROL MODULE (PCM)
1. Disconnect PCM electrical connector PI 1.
2. Measure the voltage at PI 15 pin 6 (YR).

Is the voltage more than 1 volt?

Yes
REPAIR circuit between the PI 1 pin 59 (YR) and the EGR valve electrical connector PI 15 pin 6 (YR). CLEAR DTC. To validate fix drive vehicle between 30 mph (48 kph) and 40 mph (64 kph). Allow vehicle to idle for 2 minutes.

No
INSTALL a new PCM. CLEAR DTC. To validate fix drive vehicle between 30 mph (48 kph) and 40 mph (64 kph). Allow vehicle to idle for 2 minutes.

B7 : CHECK FOR A SHORT TO BATTERY VOLTAGE
1. Measure the voltage at PI 15 pin 3 (YU).

Is the voltage more than 1 Volt?

Yes
Goto B8

No
INSTALL a new EGR valve. CLEAR DTC. To validate fix drive vehicle between 30 mph (48 kph) and 40 mph (64 kph). Allow vehicle to idle for 2 minutes.

B8 : CHECK FOR A SHORT TO BATTERY VOLTAGE IN POWERTRAIN CONTROL MODULE (PCM)
1. Disconnect PCM electrical connector PI 1.
2. Measure the voltage at PI 15 pin 3 (YU).

Is the voltage more than 1 volt?

Yes
REPAIR circuit between the PI 1 pin 60 (YU) and the EGR valve electrical connector PI 15 pin 3 (YU). CLEAR DTC. To validate fix drive vehicle between 30 mph (48 kph) and 40 mph (64 kph). Allow vehicle to idle for 2 minutes.

No
INSTALL a new PCM. CLEAR DTC. To validate fix drive vehicle between 30 mph (48 kph) and 40 mph (64 kph). Allow vehicle to idle for 2 minutes.