P1549

U : P1549. IMT Valve 1.

U1 : CHECK THE RH IMT VALVE RESISTANCE
1. Disconnect the IMT valve electrical connector, PI30.
2. Measure the resistance between pins 1 and 2 of the IMT valve.

Is the resistance 30 ohms?

Yes
Goto U2

No
Install a new IMT valve. CLEAR the DTC. TEST the system for normal operation.

U2 : CHECK THE POWER SUPPLY CIRCUIT TO THE IMT VALVE 1.
1. Turn the ignition switch to the ON position.
2. Measure the voltage between IMT valve 1 electrical connector PI30, pin 1 (NG) and GROUND.

Is the voltage greater than 10 volts?

Yes
Goto U3

No
Repair the circuit between the IMT valve 1 electrical connector PI30, pin 1 (NG) and the Battery power bus 2.
This circuit includes the power distribution fuse box and the EMS control relay. For additional information, refer to wiring diagrams. CLEAR the DTC. TEST the system for normal operation.

U3 : CHECK CONTINUITY OF THE IMT VALVE 1 SIGNAL WIRE.
1. Disconnect the PCM electrical connector, PI01.
2. Measure the resistance between the IMT valve 1 electrical connector PI30, pin 2 (OY) and the PCM electrical connector PI01, pin 38 (OY)

Is the resistance less than 5 ohms?

Yes
Goto U4

No
Repair the circuit between the IMT valve 1 electrical connector PI30, pin 2 (OY) and the PCM electrical connector PI01, pin 38 (OY). For additional information, refer to wiring diagrams. CLEAR the DTC. TEST the system for normal operation.

U4 : CHECK IMT VALVE SIGNAL WIRE FOR SHORT TO GROUND
1. Measure the resistance between PI30, pin 2 (OY) and GROUND.

Is the resistance less than 10,000 ohms?

Yes
Repair the short to GROUND. For additional information, refer to wiring diagrams. CLEAR the DTC. TEST the system for normal operation.

No
Goto U5

U5 : CHECK IMT VALVE SIGNAL WIRE FOR SHORT TO BATTERY
1. Connect the PCM electrical connector, PI01.
2. Turn the ignition switch to the ON position.
3. Check for a voltage at PI30, pin 2 (OY)

Is the voltage greater than 5 volts?

Yes
Repair the short to battery. For additional information, refer to wiring diagrams. CLEAR the DTC. TEST the system for normal operation.

No
Install a new IMT valve. CLEAR the DTC. TEST the system for normal operation. If the DTC is repeated, INSTALL a new PCM. CLEAR the DTC. TEST the system for normal operation.