P1207

DTC P1207 - AIR ASSIST INJECTOR SOLENOID VALVE CIRCUIT LOW INPUT

DTC DETECTING CONDITION:
- Immediately at fault recognition

TROUBLE SYMPTOM:
- Erroneous idling
- Engine stalls.

CAUTION: After repair or replacement of faulty parts, conduct CLEAR MEMORY MODE and INSPECTION MODE. Refer to How To Clear Diagnostic Trouble Codes.

Wiring Diagram:

WIRING DIAGRAM

11CC1: CHECK OUTPUT SIGNAL FROM ECM.

1. Turn ignition switch to ON.

Connector & Terminal - [(B134) No.24 (+) - Chassis Ground (-)]:

2. Measure voltage between ECM and chassis ground.

CHECK: Is the voltage more than 10 V?

YES: Repair poor contact in ECM connector.

NO: Go to step 11CC2.

11CC2: CHECK POWER SUPPLY TO AIR ASSIST INJECTOR SOLENOID VALVE.

1. Turn ignition switch to OFF.
2. Disconnect connector from air assist injector solenoid valve.
3. Turn ignition switch to ON.

Connector & Terminal - [(E42) No.2 (+) - Engine Ground (-)]:

4. Measure voltage between air assist injector solenoid valve and engine ground.

CHECK: Is the voltage more than 10 V?

YES: Go to step 11CC3.

NO: Repair harness and connector.

NOTE: In this case, repair the following:
- Open circuit in harness between air assist injector solenoid valve and main relay connector
- Poor contact in coupling connector (B22)

11CC3: CHECK HARNESS BETWEEN ECM AND AIR ASSIST INJECTOR SOLENOID VALVE CONNECTOR.

1. Turn ignition switch to OFF.
2. Disconnect connector from ECM.

Connector & Terminal - [(B134) No.24 - (E42) No.1]:

3. Measure resistance of harness between ECM and air assist injector solenoid valve connector.

CHECK: Is the resistance less than 1 Ohm?

YES: Go to step 11CC4.

NO: Repair harness and connector.

NOTE: In this case, repair the following:
- Open circuit in harness between ECM and air assist injector solenoid valve connector
- Poor contact in coupling connector (B22)

11CC4: CHECK HARNESS BETWEEN ECM AND AIR ASSIST INJECTOR SOLENOID VALVE CONNECTOR.

Connector & Terminal - [(B134) No.24 - Chassis Ground]:

Measure resistance of harness between ECM and chassis ground.

CHECK: Is the resistance less than 10 Ohms?

YES: Repair ground short circuit in harness between ECM and air assist injector solenoid valve connector.

NO: Go to step 11CC5.

11CC5: CHECK POOR CONTACT.
Check poor contact in ECM and air assist injector solenoid valve connectors.

CHECK: Is there poor contact in ECM and air assist injector solenoid valve connectors?

YES: Repair poor contact in ECM and air assist injector solenoid valve connectors.

NO: Replace air assist injector solenoid valve.