DTC P2146 (Flash Code 158) Fuel Injector Group 1 Supply Voltage Circuit (RZ4E-TC)

1. DTC P2146 description

The ECM calculates the optimum fuel injection ON time based on the data sent from various sensors. The ECM supplies high voltage to the injector charge voltage circuit, grounds the injector solenoid control circuit and drives the injectors of each cylinder. The injector charge voltage circuit shares a bus inside the ECM, and is divided into 2 banks: common power supply 1 and common power supply 2. Common power supply 1 serves the injectors of cylinders No. 1 and No. 4, and common power supply 2 serves the injectors of cylinders No. 2 and No. 3. If the ECM detects a malfunction in the common power supply 1 injector circuit, this DTC is set.

2. Condition for setting DTC P2146

Condition for running the DTC

The battery voltage is 9 to 16 V.
The ignition voltage is 9 to 16 V.
The ignition switch is ON.
The engine is running.
DTCs P0201, P0204, P06AF, and P1261 are not set.

Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) DTC P0201 (Flash Code 271) Injector Circuit - Cylinder 1".

Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) DTC P0204 (Flash Code 274) Injector Circuit - Cylinder 4".

Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) DTC P06AF (Flash Code 277) EDU (Electric Driver Unit) Injector Custom IC".

Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) DTC P1261 (Flash Code 34) Injector Positive Voltage Control Circuit Group 1".

Condition for setting the DTC

The ECM detects that there is a short to ground or a short to the voltage circuit in the common power supply 1 injector charge voltage circuit.

3. Action taken when DTC P2146 sets

Euro4: The ECM illuminates the MIL. Refer to Action taken when DTC sets - Type A (Euro4).
Except Euro4: The ECM illuminates the check engine warning light. Refer to Action taken when DTC sets - Type A (Except Euro4).

Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) DTC type definitions".

The ECM limits the fuel injection quantity.
The ECM inhibits pre-injection.
The ECM limits the fuel rail pressure.
The ECM inhibits the cruise control.

4. Condition for clearing DTC P2146

Euro4: Refer to Condition for clearing the MIL/DTC - Type A or Type B (Euro4).
Except Euro4: Refer to Condition for clearing the check engine warning light/DTC - Type A or Type B (Except Euro4).

Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) DTC type definitions".