P0201
DTC P0201 INJECTOR CIRCUIT/OPEN-CYLINDER 1Component Location:
COMPONENT LOCATION
GENERAL DESCRIPTION
Based on information from various sensors, the PCM measures the fuel injection amount. The fuel injector is a solenoid- operated valve and the fuel injection amount is controlled by length of time the fuel injector is held open. The PCM controls each injector by grounding the control circuit. When the PCM energizes the injector by grounding the control circuit, the circuit voltage should be low (theoretically 0 V) and the fuel is injected. When the PCM de-energizes the injector by opening control circuit, the fuel injector is closed and circuit voltage should momentarily peak.
DTC DESCRIPTION
If the Surge voltage of cylinder 1 is lower than the threshold value, the PCM determines that a fault exists and a DTC is stored.
DTC Detecting Condition:
Specification:
Schematic Diagram:
Signal Waveform & Data:
ACTUATOR TEST MODE
1. Ignition "OFF"
2. Connect Scantool and Engine "ON"
3. Perform Actuation Test for Injector in scantool.
4. Is the engine poor idle generated by ACTUATION TEST for Injector?
YES: Fault is intermittent caused by poor contact in the sensor's and/or PCM's connector or was repaired and PCM memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure.
NO: Go to "W/Harness Inspection" procedure.
TERMINAL & CONNECTOR INSPECTION
1. Many malfunctions in the electrical system are caused by poor harness and terminals.
Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found?
YES: Repair as necessary and go to "Verification of Vehicle Repair" procedure.
NO: Go to "Power Circuit Inspection" procedure.
POWER SUPPLY CIRCUIT INSPECTION
1. Check Voltage
1. Ignition "OFF"
2. Disconnect Injector connector
3. ignition "ON" & Engine "OFF"
4. Measure voltage between terminal 2 of injector harness connector and chassis ground.
Specification: Approx. B+
5. Is the measured voltage within specification?
YES: Go to "Control Circuit Inspection" procedure.
NO: Go to "Check for open in harness" as below.
2. Check for open in harness
1. Ignition "OFF"
2. Disconnect injector connector.
3. Measure resistance between terminal 2 of injector harness connector and terminal 4 of Control Relay harness connector.
Specification: Approx. below 1 Ohms
4. Is the measured resistance within specification?
YES: Go to "Control Circuit Inspection" procedure.
NO:
- Check for open in harness.
- Check that injector fuse 10 A between injector and Control Relay is installed or blown off.
- Repair or replace as necessary. And then, go to "Verification of Vehicle Repair" procedure.
CONTROL CIRCUIT INSPECTION
1. Check for short to ground in harness
1. Ignition "OFF"
2. Disconnect injector connector
3. Measure resistance between terminal 1 of injector harness connector and chassis ground
Specification: Infinite
4. Is the measured resistance within specification?
YES: Go to "Check for open in harness" as below
NO:
- Check for short to ground in harness.
- Repair or replace as necessary. And then, go to "Verification of Vehicle Repair" procedure.
2. Check for open in harness
1. Ignition "OFF"
2. Disconnect injector connector and PCM connector.
3. Measure resistance between terminal 1 of injector harness connector and terminal 1/ C44-1 of PCM harness connector.
Specification: Approx. below 1 Ohms
4. Is the measured resistance within specification?
YES: Go to "Component Inspection" procedure.
NO:
- Check for open in harness.
- Repair or replace as necessary. And then, go to "Verification of Vehicle Repair" procedure.
COMPONENT INSPECTION
1. Check Injector
1. Ignition "OFF"
2. Disconnect Injector connector.
3. Measure resistance between terminal 1 and 2 of injector connector.
Specification: 13.8 - 15.2 Ohms at 20 °C (68 °F)
4. Is the measured resistance within specification?
YES: Substitute with a known - good PCM and check for proper operation.
If the problem is corrected, replace PCM and go to "Verification of Vehicle Repair" procedure.
NO: Substitute with a known - good injector and check for proper operation.
If the problem is corrected, replace injector and go to "Verification of Vehicle Repair" procedure.
VERIFICATION OF VEHICLE REPAIR
After a repair, it is essential to verify that the fault has been corrected.
1. Monitor and record the Freeze Frame Data for the Diagnostic Trouble Code(DTC) which has been diagnosed.
2. Using a Scantool, Clear the DTCs.
3. Operate the vehicle within conditions noted in the freeze frame data or enable conditions.
4. Monitor that all readiness tests have been verified as "Complete"
5. Are any DTCs present?
YES: Go to the applicable troubleshooting procedure.
NO: System is performing to specification at this time.