For 1990-2009 cars

### Diagnostic Instructions

• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• | Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• | Diagnostic Procedure Instructions provides an overview of each diagnostic category.

### DTC Descriptors

DTC P0201: Injector 1 Control Circuit
DTC P0202: Injector 2 Control Circuit
DTC P0203: Injector 3 Control Circuit
DTC P0204: Injector 4 Control Circuit
DTC P0261: Injector 1 Control Circuit Low Voltage
DTC P0262: Injector 1 Control Circuit High Voltage
DTC P0264: Injector 2 Control Circuit Low Voltage
DTC P0265: Injector 2 Control Circuit High Voltage
DTC P0267: Injector 3 Control Circuit Low Voltage
DTC P0268: Injector 3 Control Circuit High Voltage
DTC P0270: Injector 4 Control Circuit Low Voltage
DTC P0271: Injector 4 Control Circuit High Voltage
DTC P2146: Injector Positive Voltage Control Circuit Group 1
DTC P2149: Injector Positive Voltage Control Circuit Group 2
DTC P2152: Injector Positive Voltage Control Circuit Group 3
DTC P2155: Injector Positive Voltage Control Circuit Group 4

### Diagnostic Fault Information

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
Direct Fuel Injector High Voltage Supply Cylinder 1 | P0300, P0301, P0304, P2146, P2155 | P0201, P0300, P0301, P0304 | P0300, P0301, P0304, P2146, P2155 | --
Direct Fuel Injector High Voltage Supply Cylinder 2 | P0300, P0302, P0303, P2149, P2152 | P0202, P0300, P0302, P0303 | P0300, P0302, P0303, P2149, P2152 | --
Direct Fuel Injector High Voltage Supply Cylinder 3 | P0300, P0302, P0303, P2149, P2152 | P0203, P0300, P0302, P0303 | P0300, P0302, P0303, P2149, P2152 | --
Direct Fuel Injector High Voltage Supply Cylinder 4 | P0300, P0301, P0304, P2146, P2155 | P0204, P0300, P0301, P0304 | P0300, P0301, P0304, P2146, P2155 | --
Direct Fuel Injector High Voltage Control Cylinder 1 | P0261, P0300, P0301 | P0201, P0300, P0301 | P0262, P0300, P0301 | --
Direct Fuel Injector High Voltage Control Cylinder 2 | P0264, P0300, P0302 | P0202, P0300, P0302 | P0265, P0300, P0302 | --
Direct Fuel Injector High Voltage Control Cylinder 3 | P0267, P0300, P0303 | P0203, P0300, P0303 | P0268, P0300, P0303 | --
Direct Fuel Injector High Voltage Control Cylinder 4 | P0270, P0300, P0304 | P0204, P0300, P0304 | P0271, P0300, P0304 | --

### Circuit/System Description

The engine control module (ECM) supplies voltage to each fuel injector on the injector high voltage supply circuits. The ECM energizes each fuel injector by grounding the high voltage control circuit of that fuel injector. The ECM monitors the status of the injector high voltage supply circuits and the fuel injector high voltage control circuits. When a fuel injector circuit condition is detected by the ECM, the affected fuel injector will be disabled.

### Conditions for Running the DTC

• | The engine speed is more than 80 RPM.

• | The ignition 1 signal parameter is between 8-18.1 volts.

• | The DTCs run continuously within the enabling conditions.

### Conditions for Setting the DTC

The control module detects an incorrect voltage on the high voltage supply circuit or the high voltage control circuit for greater than 4 seconds continuously or 50 seconds cumulative.

### Action Taken When the DTC Sets

DTCs P0201, P0202, P0203, P0204, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P2146, P2149, P2152, and P2155 are Type B DTCs.

### Conditions for Clearing the DTC

DTCs P0201, P0202, P0203, P0204, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P2146, P2149, P2152, and P2155 are Type B DTCs.

### Reference Information

#### Schematic Reference

Engine Controls Schematics

#### Connector End View Reference

• | Engine Controls Connector End Views

• | Engine Control Module Connector End Views

• | Inline Harness Connector End Views

#### Description and Operation

Fuel System Description

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

#### Scan Tool Reference

• | Scan Tool Data Definitions

• | Scan Tool Data List

• | Scan Tool Output Controls

### Circuit/System Verification

1. Observe the Misfire Current Counters with a scan tool. The Misfire Current Counters should not be incrementing.
2. Engine operating, observe the DTC information with a scan tool. DTCs P0201, P0202, P0203, P0204, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P2146, P2149, P2152, and P2155 should not set.

### Circuit/System Testing

1. Ignition OFF, disconnect the C162 fuel injector multi-way harness connector.
2. Inspect the C162 fuel injector multi-way harness connector for proper connection, proper terminal contact, and proper terminal retention force.

⇒ | If a condition is found, repair the poor connection at the C162 connector.

3. Engine cranking, verify that a test lamp flashes brightly between ground and the high voltage supply circuit terminal, ECM side of the connector, of the appropriate fuel injector listed below.

• | Injector 1 terminal 7

• | Injector 2 terminal 8

• | Injector 3 terminal 9

• | Injector 4 terminal 10

⇒ | If the test lamp is always ON, test the appropriate fuel injector high voltage supply circuit for a short to voltage. If the circuit tests normal, replace the ECM.

⇒ | If the test lamp is always OFF, test the appropriate fuel injector high voltage supply circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.

4. Engine cranking, verify that a test lamp flashes dimly between B+ and the high voltage control circuit terminal, ECM side of the connector, of the appropriate fuel injector listed below.

• | Injector 1 terminal 1

• | Injector 2 terminal 2

• | Injector 3 terminal 3

• | Injector 4 terminal 4

⇒ | If the test lamp is always ON, test the appropriate fuel injector high voltage control circuit for a short to ground. If the circuit tests normal, replace the ECM.

⇒ | If the test lamp is always OFF, test the appropriate fuel injector high voltage control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.

5. Ignition OFF, test for continuity between the suspected high voltage supply circuit and the remaining high voltage supply circuits, engine side of the connector. The DMM should display OL.

• | Injector 1 terminal 7

• | Injector 2 terminal 8

• | Injector 3 terminal 9

• | Injector 4 terminal 10

⇒ | If less than the specified value, repair the high voltage supply circuit for a short to the high voltage supply circuit.

6. Ignition OFF, verify that a test lamp does not illuminate between the appropriate high voltage supply circuit terminal listed below, engine side of the connector, and B+.

• | Injector 1 terminal 7

• | Injector 2 terminal 8

• | Injector 3 terminal 9

• | Injector 4 terminal 10

⇒ | If the test lamp illuminates, repair the high voltage supply circuit for a short to ground.

7. Ignition OFF, test for continuity between the suspected high voltage control circuit and the high voltage supply circuits listed below, engine side of the connector. The DMM should display OL.

• | Injector 1 terminal 7

• | Injector 2 terminal 8

• | Injector 3 terminal 9

• | Injector 4 terminal 10

⇒ | If less than the specified value, repair the high voltage control circuit for a short to the high voltage supply circuit.

8. Ignition OFF, verify that a test lamp does not illuminate between the appropriate high voltage control circuit terminal listed below, engine side of the connector, and B+.

• | Injector 1 terminal 1

• | Injector 2 terminal 2

• | Injector 3 terminal 3

• | Injector 4 terminal 4

⇒ | If the test lamp illuminates, repair the high voltage control circuit for a short to ground.

9. Ignition OFF, test for 1.5-4 ohms of resistance between the appropriate fuel injector high voltage supply circuit terminal and the fuel injector high voltage control circuit terminal, engine side of the connector, of the appropriate fuel injector listed below.

• | Injector 1 terminals 1 and 7

• | Injector 2 terminals 2 and 8

• | Injector 3 terminals 3 and 9

• | Injector 4 terminals 4 and 10

⇒ | If the resistance is not within the specified range, test for an open/high resistance between C162 and the appropriate fuel injector harness connector. If the circuits test normal, test or replace the fuel injector.

### Component Testing

#### Static Test

1. Test for 1.5 ohms plus/minus 0.15 ohm at 20°C (68°F) of resistance between the high voltage supply circuit terminal 2 and the high voltage control circuit terminal 1 at the fuel injector.

⇒ | If not within the specified range, replace the fuel injector.

2. Test for infinite resistance between each terminal and the fuel injector housing/case.

⇒ | If not the specified value, replace the fuel injector.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Control Module References for ECM replacement, setup, and programming

• | Direct Fuel Injector Replacement

• | Sumitomo Connectors