P1549

X :P1549. IMT VALVE 1

G92429t120 : 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 EN999 pin 1 (NG) and GROUND.

- Is the voltage greater than 10 volts?

-> Yes

-> No
REPAIR the circuit between the IMT valve 1 electrical connector EN999 pin 1 (NG) and the Battery power bus 2. CLEAR the DTC. TEST the system for normal operation.This circuit includes the power distribution fuse box and the EMS control relay.

G92429t121 : CHECK CONTINUITY OF THE IMT VALVE 1 SIGNAL WIRE.
1. Disconnect the ECM electrical connector EN16.
2. Measure the resistance between the IMT valve 1 electrical connector EN999 pin 2 (OY) and the ECM electrical connector EN16 pin 38 (OY).

- Is the resistance less than 5 ohms?

-> Yes

-> No
REPAIR the circuit between the IMT valve 1 electrical connector EN999 pin 2 (OY) and the ECM electrical connector EN16 pin 38 (OY). CLEAR the DTC. TEST the system for normal operation.

G92429t161 : CHECK IMT VALVE SIGNAL WIRE FOR SHORT TO GROUND
1. Measure the resistance between EN999 pin 2 (OY) and GROUND.

- Is the resistance less than 10,000 ohms?

-> Yes
REPAIR the short to GROUND. CLEAR the DTC. TEST the system for normal operation.

-> No

G92429t162 : CHECK IMT VALVE SIGNAL WIRE FOR SHORT TO BATTERY
1. Connect the ECM electrical connector EN16.
2. Turn the ignition switch to the ON position.
3. Check for a voltage at EN999 pin 2 (OY).

- Is the voltage greater than 10 volts?

-> Yes
REPAIR the short to battery. 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 ECM. Before replacing an ECM, contact dealer technical support. CLEAR the DTC. TEST the system for normal operation.