P0268-FUEL INJECTOR 3 CIRCUIT HIGH

For a complete wiring diagram Refer to Section 8W

When Monitored:
With battery voltage greater than 10 volts, Main relay energized, and engine speed less than 3000 rpm.
Set Condition:
The PCM detects that the Fuel Injector 3 input voltage is above the maximum acceptable value.

Possible Causes

INTERMITTENT DTC

(K13) INJECTOR 3 CONTROL CIRCUIT SHORTED TO VOLTAGE

(K13) INJECTOR 3 CONTROL CIRCUIT SHORTED TO (K343) FUSED MAIN RELAY OUTPUT CIRCUIT

(K13) INJECTOR 3 CONTROL CIRCUIT OPEN OR HIGH RESISTANCE

(K343) FUSED MAIN RELAY OUTPUT CIRCUIT OPEN OR HIGH RESISTANCE

FUEL INJECTOR 3

POWERTRAIN CONTROL MODULE (PCM)

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

Diagnostic Test

1. DTC IS ACTIVE

NOTE: Diagnose and repair any system voltage or sensor reference voltage DTCs before continuing with this test.

Start the engine and allow it to reach normal operating temperature.

WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death.

With the scan tool, select View DTCs.

Is the status Active for this DTC?

Yes

Go to 2

Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

2. (K13) INJECTOR 3 CONTROL CIRCUIT SHORTED TO VOLTAGE

Turn the ignition off.
Disconnect the Fuel Injector 3 connector.
Disconnect the Powertrain Control Module (PCM) connector.
Turn the ignition on.
Measure the voltage of the (K13) Injector 3 Control circuit in the Fuel Injector 3 harness connector.

Is there any voltage present?

Yes

Repair the (K13) Injector 3 Control circuit for a short to voltage.

Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDURE).

Go to 3

3. (K13) INJECTOR 3 CONTROL CIRCUIT SHORTED TO (K343) FUSED MAIN RELAY OUTPUT CIRCUIT

Measure the resistance between the (K13) Injector 3 Control circuit and the (K343) Fused Main Relay Output circuit in the Fuel Injector 3 harness connector.

Is the resistance above 100 ohms?

Yes

Go to 4

Repair the (K13) Injector 3 Control circuit for a short to the (K343) Fused Main Relay Output circuit.
Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDURE).

4. (K13) INJECTOR 3 CONTROL CIRCUIT OPEN OR HIGH RESISTANCE

Measure the resistance of the (K13) Injector 3 Control circuit between the Fuel Injector 3 harness connector and the Powertrain Control Module (PCM) harness connector.

Is the resistance below 5.0 ohms?

Yes

Go to 5

Repair the (K13) Injector 3 Control circuit for an open circuit or high resistance.
Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDURE).

5. FUEL INJECTOR 3

Turn the ignition off.
Measure the resistance between the terminals of Fuel Injector 3.

NOTE: The resistance of the circuit will vary according to the temperature of the injector coil. Use the table below to determine the resistance range of the injector.

Fuel Injector Coil Resistance Based on Engine Temperature
Temperature	Resistance
–20° C (–4° F)	10 ohms (+/– .6 ohms)
20° C (68° F)	12 ohms (+/– .6 ohms)
60° C (140° F)	14 ohms (+/– .6 ohms)
100° C (212° F)	16 ohms (+/– .6 ohms)

Is the resistance of the injector within the specified range?

Yes

Go to 6

Replace Fuel Injector 3 in accordance with the Service Information.
Perform the PCM Verification Test. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

6. POWERTRAIN CONTROL MODULE (PCM)

Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Injector 3 and the Powertrain Control Module (PCM).
Look for any chafed, pierced, pinched, or partially broken wires.
Look for broken, bent, pushed out or corroded terminals.
Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors.
Look for the data to change or for the DTC to reset during the wiggle test.
Refer to any Technical Service Bulletins that may apply.

Were any problems found?

Yes

Repair as necessary.

Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDURE).

Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information.
Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDURE).